Diversity

12 pages, 3597 KiB

Open AccessArticle

Termite (Blattodea: Isoptera) Distribution Along an Elevational Gradient in Northwestern African Mountains

by Aya Najjari, David Hernández-Teixidor, Bilal El Ajjouri, Yousra Benyahia and Ahmed Taheri

Diversity 2024, 16(12), 714; https://doi.org/10.3390/d16120714 - 22 Nov 2024

We examined the distribution of termites along an elevational gradient in the western Rif Mountains of northern Morocco. Sampling followed standardized protocols at nine forest sites (125, 325, 488, 715, 850, 1150, 1316, 1544, and 1700 masl), all except the lowest site within [...] Read more.

We examined the distribution of termites along an elevational gradient in the western Rif Mountains of northern Morocco. Sampling followed standardized protocols at nine forest sites (125, 325, 488, 715, 850, 1150, 1316, 1544, and 1700 masl), all except the lowest site within the Intercontinental Mediterranean Biosphere Reserve. We found a total of three termite species, with Reticulitermes grassei (Rhinotermitidae) being the most abundant, followed by Kalotermes flavicollis (Kalotermitinae) and Amitermes sp. (Terminidae). Comparing microhabitat preferences, we found R. grassei and Amitermes sp. exclusively in buried wood and under rocks, and K. flavicollis exclusively in dead tree trunks and surface wood. The findings reveal the distribution of microhabitats along an elevation gradient and the corresponding preferences of termite species across these microhabitats. We found that total termite density decreased significantly with elevation (r_s = −0.40; p < 0.001), but with distinct differences among species. Kalotermes flavicollis and Amitermes sp. showed a strong negative correlation between density and elevation. In contrast, for R. grassei, the most common termite, we found no significant correlation. Termite density also varied among forest types, with a non-significant trend (p = 0.075) of higher density in the cork oak forest (hits/m² = 0.06) compared to holm oak (0.04) and fir–cedar (0.02) forests. This research contributes to the limited knowledge of termite diversity and ecology in northern Africa and western Mediterranean forests. Full article

(This article belongs to the Special Issue Diversity and Ecology of Termites)

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14 pages, 2895 KiB

Open AccessArticle

New Insights About Distribution Areas of Telestes souffia and Telestes muticellus: Changes and Overlapping Zones for Community Interest Fish Species

by Marco Bertoli, Chiara Manfrin, Piero Giulio Giulianini, Alberto Pallavicini, Paolo Pastorino and Elisabetta Pizzul

Diversity 2024, 16(12), 713; https://doi.org/10.3390/d16120713 - 22 Nov 2024

Abstract

Fish geographical distribution has pivotal importance in management/conservation policies, especially for community interest species, requiring careful protection measures. However, distribution areas could be difficult to define if the taxonomy has only recently been resolved, and particular attention must be paid where co-generic species [...] Read more.

Fish geographical distribution has pivotal importance in management/conservation policies, especially for community interest species, requiring careful protection measures. However, distribution areas could be difficult to define if the taxonomy has only recently been resolved, and particular attention must be paid where co-generic species share their ranges. Our work reports new insights about the distribution of T. muticellus and T. souffia in Northeastern Italy, where their geographical ranges overlap, and these native species share a cross-border area. Fish samplings and meristic and genetical investigations were performed, and our results showed that T. muticellus seems to expand its range east due to human-induced translocations, while T. souffia occurs only in the cross-border hydrological networks between Italy and Slovenia. Telestes genetic characterization for the Tagliamento River Basin and Northeastern Italy lowland is reported, improving the genus distribution dataset in the Po Plain watershed, where T. muticellus is endemic. The main meristic feature to discriminate the species was the number of lateral line scales, explaining 44.5% of the dissimilarity among the analyzed populations. Findings about the distribution of the investigated populations highlight the critical need for targeted conservation strategies in biodiversity hotspots, where overlapping species distributions, such as T. muticellus and T. souffia, play a vital role in preserving regional biodiversity. Full article

(This article belongs to the Special Issue Freshwater Biodiversity Hotspots in 2024)

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12 pages, 8106 KiB

Open AccessArticle

Spatial and Temporal Diversity of Fishes at Wuzhizhou Island in the South China Sea Based on Environmental DNA

by Ting Jiang, Kun Cao, Xin Wang, Rui Xi, Chongzhao Wang, Rui Yang, Wei Yang, Zhenhua Ma and Yingchun Xing

Diversity 2024, 16(12), 712; https://doi.org/10.3390/d16120712 - 21 Nov 2024

Abstract

Wuzhizhou Island (WZZ) is one of the most mature tourism islands on the coast of the South China Sea, and its surrounding waters are rich in tropical coral reef fishes. Tourism could affect marine biodiversity, especially the coral reef fish community. In order [...] Read more.

Wuzhizhou Island (WZZ) is one of the most mature tourism islands on the coast of the South China Sea, and its surrounding waters are rich in tropical coral reef fishes. Tourism could affect marine biodiversity, especially the coral reef fish community. In order to understand the species diversity of fish surrounding WZZ, environmental DNA (eDNA) samples were collected from six sampling sites around the island, located in the core and non-core tourism areas, respectively, from 2022 to 2023. In total, 188 fish species, belonging to 124 genera, 63 families and 17 orders, were detected using eDNA method. The Perciformes contained the highest number of species (n = 130, 69.15% of total number). Compared to traditional fishing nets, eDNA could provide more information on fish species. The results indicated that species richness and Margalef’s index were higher at the sampling sites in the core area of tourism of WZZ, which maybe relevant to tourism-based provisioning. By contrast, the Shannon–Wiener index, Pielou’s index and dominant species of fish did not display significant differences between core and non-core tourism areas. On the basis of the results of the β-diversity index, the differences in fish communities had a closer relationship to geographical location. Furthermore, there were obvious differences in fish communities in different seasons, which may be attributed to the influence of ocean currents. Full article

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19 pages, 744 KiB

Open AccessArticle

A Multidisciplinary Approach for the Assessment of the Last Surviving ‘Marrone di Chiusa Pesio’ Chestnut Trees in the Piemonte Region (Italy)

by Giovanna Neirotti, Alessandro Tomatis, Federica Germanà, Alessia Imparato, Andrea Valisena, Maria Gabriella Mellano, Paola Ruffa, Dario Donno, Daniela Torello Marinoni, Gabriele Loris Beccaro and Giovanni Gamba

Diversity 2024, 16(12), 711; https://doi.org/10.3390/d16120711 - 21 Nov 2024

Abstract

Chestnut orchards are a multifunctional resource, providing not only fruit or wood but also playing a role in the conservation of mountain and hillside landscapes. In the Piemonte Region, Italy, a rich genetic heritage of chestnut genotypes has contributed to considerable biodiversity and [...] Read more.

Chestnut orchards are a multifunctional resource, providing not only fruit or wood but also playing a role in the conservation of mountain and hillside landscapes. In the Piemonte Region, Italy, a rich genetic heritage of chestnut genotypes has contributed to considerable biodiversity and environmental value. The study aimed to valorize an important example of the chestnut agrobiodiversity in the Piemonte Region by focusing on the ‘Marrone di Chiusa Pesio’ (MCP) cultivar (cv). A multidisciplinary approach was applied, involving genetic and morphological analyses, Visual Tree Assessment (VTA), and phytochemical and nutritional profiling. The plant census provided identification and geolocation of 187 MCP specimens; the 20 most representative trees were genetically analyzed, and then, through the VTA, their morpho-functional status was evaluated. The nutraceutical properties and phytochemical composition were assessed by measuring the total polyphenol content (TPC), antioxidant capacity (AOC), and other phytochemical classes through spectrophotometric and chromatographic methods. The results showed significantly higher TPC values (ranged from 36.51 ± 1.60 mgGAE/100 g of dried weight—DW to 103.14 ± 1.24 mgGAE/100 g DW) compared to other ‘Marrone-type’ cultivars, along with high levels of key phenolic markers, bioactive compounds, and nutritional substances. These included tannins (about 22–28 mg/100 g DW) and cinnamic acids (about 23–25 mg/100 g DW), followed by flavonols, benzoic acids, organic acids, monoterpenes, vitamin C, and catechins, listed in order of predominance. A Principal Component Analysis (PCA) was performed to observe the distribution of the samples and their correlations based on the chemical composition. The results confirmed the interesting phytochemical properties of the ‘Marrone di Chiusa Pesio’ nuts, together with their good morphological and functional properties. Given the ongoing genetic erosion of Castanea sativa cultivars, due to cultivation abandonment and climate change, the main factors contributing to the progressive loss of biodiversity worldwide, the presented approach aimed to provide an overview of the conservation status of the local agrobiodiversity. This study highlighted the value of a local chestnut cultivar, presenting the low conservation status of the few remaining specimens. The goal was to define the significant phenotypic variation regarding MCP in the considered area due to environmental variations, which may be of interest in its genetic adaptation to climate change. The study may potentially encourage the development of strategies for actively conserving the forest agrobiodiversity and hillside ecosystem services in the highly diverse landscapes of the Alpine valleys. Full article

(This article belongs to the Special Issue Biodiversity in Italy: Past and Future Perspectives)

24 pages, 4679 KiB

Open AccessArticle

The Coral Reefs and Fishes of St. Brandon, Indian Ocean Archipelago: Implications for Sustainable Fisheries

by Melanie Ricot, Sruti Jeetun, Shakeel Yavan Jogee, Deepeeka Kaullysing, Nawsheen Taleb-Hossenkhan, Maina Joseph Mbui, Beatriz Estela Casareto, Yoshimi Suzuki, Diah Permata Wijayanti and Ranjeet Bhagooli

Diversity 2024, 16(12), 710; https://doi.org/10.3390/d16120710 - 21 Nov 2024

Abstract

Understanding the factors influencing the variability in the composition of fish assemblages is essential for bolstering the resilience of coral reef ecosystems, effective coral reef management and maintaining sustainable fisheries. The benthic composition and reef fish assemblages at eight sites at the poorly [...] Read more.

Understanding the factors influencing the variability in the composition of fish assemblages is essential for bolstering the resilience of coral reef ecosystems, effective coral reef management and maintaining sustainable fisheries. The benthic composition and reef fish assemblages at eight sites at the poorly studied St. Brandon, also known as a bank fisheries area in the Indian Ocean, were assessed to discern distribution patterns, including differences between channel (Passe Grand Capitaine, Passe Ile Longue-Canal Coco and Passe La Cayane) and non-channel (Chaloupe, Anchor Points 1 and 2, Bain des Dames, Pearl Island) sites and fisheries sustainability. The benthic composition exhibited clusters, revealing the distinct separation of Chaloupe which predominantly featured sand (75.26%) interspersed with sporadic coral patches characterized by live and dead corals and rubble. The three channel sites composed a cluster. Coral species across eight families were identified, with significant variability (p < 0.05) observed in their benthic cover, particularly live coral cover (LCC). Fish density and diversity analyses unveiled 58 fish species from 12 families, with no statistically significant disparity in density among sites. Total fish biomass (TFB) and target fish biomass (TB) ranged from 138.02 ± 65.04 to 4110.16 ± 3048.70 kg/ha and from 28.31 ± 24.52 to 3851.27 ± 2753.18 kg/ha, respectively. TFB and TB differed significantly (p < 0.05) among sites irrespective of channel and non-channel sites, with Pearl Island recording the highest biomass. TFB and TB recorded at five out of the eight surveyed sites exceeded the mean biomass benchmark (B₀) for the Western Indian Ocean, set at 1150.00 and 560.00 kg/ha for TFB and TB, respectively. Functional group analysis unveiled six discrete groups influencing TFB, with scrapers being the most dominant. This study presents the first report on fish biomass surveys in St. Brandon, highlighting a case for sustainable fisheries in the waters of the Republic of Mauritius. Full article

(This article belongs to the Special Issue Biodiversity and Conservation of Coral Reefs)

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12 pages, 3054 KiB

Open AccessArticle

The Fishery Biology of Two Deep-Water Skates, Bathyraja schroederi and Amblyraja frerichsi (Rajiformes: Rajidae), from the Southeast Pacific Ocean

by Carolina Vargas-Caro, María J. Indurain and Carlos Bustamante

Diversity 2024, 16(12), 709; https://doi.org/10.3390/d16120709 - 21 Nov 2024

Abstract

Chile is a biodiverse region for deep-water skates (Rajiformes), with 36 species documented in national waters, of which 73% correspond to deep-water species. Among them, the Thickbody skate (Amblyraja frerichsi) and Whitemouth skate (Bathyraja schroederi) are two poorly documented [...] Read more.

Chile is a biodiverse region for deep-water skates (Rajiformes), with 36 species documented in national waters, of which 73% correspond to deep-water species. Among them, the Thickbody skate (Amblyraja frerichsi) and Whitemouth skate (Bathyraja schroederi) are two poorly documented species with relatively high abundances. However, the current information is limited to a few specimens reported over the last 50 years between southern Brazil (SW Atlantic) and central Chile (SE Pacific). In the Southeast Pacific, both species are bycatch in the Patagonian toothfish (Dissostichus eleginoides) fishery, which operates along the Chilean coast between 800 and 1600 m of depth. This study examined aspects of demography and reproductive biology based on data from 190 specimens (125 A. frerichsi and 65 B. schroederi) obtained from the fishery in northern Chile. The new data contribute to enhancing our understanding of deep-water skate communities and highlight the vulnerability and fishing pressure experienced across their geographic distribution. Full article

(This article belongs to the Special Issue Recent Advances in Ecology, Evolution and Biodiversity of the Chondrichthyan Fauna)

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26 pages, 7756 KiB

Open AccessArticle

Botany Teaching–Learning Proposal Using the Phytosociological Method for University Students’ Study of the Diversity and Conservation of Forest Ecosystems for University Students

by Ana Cano-Ortiz, José Carlos Piñar Fuentes, Carmelo Maria Musarella and Eusebio Cano

Diversity 2024, 16(12), 708; https://doi.org/10.3390/d16120708 - 21 Nov 2024

Abstract

We propose a method consisting of four steps for phytosociological research and education on flora and vegetation diversity. We demonstrate the application of this method using as an example a territory of special interest due to its high index of endemism (Dominican [...] Read more.

We propose a method consisting of four steps for phytosociological research and education on flora and vegetation diversity. We demonstrate the application of this method using as an example a territory of special interest due to its high index of endemism (Dominican Republic Island), which is a biodiversity hotspot and hosts several protected areas, such as the Jaragua-Bahoruco-Enriquillo Biosphere Reserve. Nonetheless, this model, based on teaching the phytosociological method, can be extrapolated to any location worldwide. As an example, we analyzed the dry and humid forests. Through the four research phases, this study revealed a greater number of endemic species in the dry forest compared to the humid forest, with more endemics found in districts A12 and A16. The sequenced teaching of the research phases allows for the training of university students, future managers, and educators. The model enables learning sampling techniques, developing analysis and interpretation skills, and assessing the need for conservation of habitats rich in endemic species. The teaching outcomes of this study provide optimal training for the management and dissemination of ecological values, which allow broader society to learn to respect the environment. Full article

(This article belongs to the Special Issue Plant Diversity on Islands)

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15 pages, 1526 KiB

Open AccessArticle

Predation Risk, Foraging and Reproduction of an Insectivore Fish Species Associated with Two Estuarine Habitats

by Éden Hávila Lima Guedes, Juan Alves Pereira, Gitá Juan Soterorudá Brito, Alexandre da Gama Fernandes Vieira Júnior and André Luiz Machado Pessanha

Diversity 2024, 16(11), 707; https://doi.org/10.3390/d16110707 - 20 Nov 2024

Abstract

Pneumatophore fringes and mudflats are extremely valuable habitats and provide structures on which many fish species benefit in terms of food and reduced predation risk. We analyzed the spatiotemporal patterns in feeding habits, reproductive aspects and effects of predatory fish presence to assess [...] Read more.

Pneumatophore fringes and mudflats are extremely valuable habitats and provide structures on which many fish species benefit in terms of food and reduced predation risk. We analyzed the spatiotemporal patterns in feeding habits, reproductive aspects and effects of predatory fish presence to assess the ecological drivers of the common halfbeak, Hyporhamphus unifasciatus, in a Brazilian estuary. Sampling was conducted during the rainy and dry periods. In summary, the results demonstrated that the number of predatory fishes was a strong predictor of population abundance and biomass, followed by pneumatophore complexity. The abundance and biomass values tended to increase with increasing habitat structural complexity towards the upper estuary. There was evidence that fish exhibited movement during the rainy season related to spawning events and subsequent juvenile recruitment in this area. Hymnoptera was the item most frequently ingested and made the greatest contributions to the volume of diet in habitat types throughout the year. There was an increase in the condition factor in the rainy season, which was associated with energy reserves, reproduction and growth (fitness). We concluded that predation is an important ecological process that operates at local spatial scales and that, together with the density of pneumatophores, it could affect the abundance of common halfbeak populations associated with estuarine habitats. Full article

(This article belongs to the Section Marine Diversity)

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15 pages, 3033 KiB

Open AccessArticle

Congruent and Hierarchical Intra-Lake Subdivisions from Nuclear and Mitochondrial Data of a Lake Baikal Shoreline Amphipod

by Risto Väinölä, Tytti Kontula, Kazuo Mashiko and Ravil M. Kamaltynov

Diversity 2024, 16(11), 706; https://doi.org/10.3390/d16110706 - 20 Nov 2024

Abstract

A central goal of molecular studies on ancient lake faunas is to resolve the origin and phylogeny of their strikingly diverse endemic species flocks. Another equally intriguing goal is to understand the integrity of individual morphologically diagnosed species, which should help to perceive [...] Read more.

A central goal of molecular studies on ancient lake faunas is to resolve the origin and phylogeny of their strikingly diverse endemic species flocks. Another equally intriguing goal is to understand the integrity of individual morphologically diagnosed species, which should help to perceive the nature and speed of the speciation process, and the true biological species diversity. In the uniquely diverse Lake Baikal amphipod crustaceans, molecular data from shallow-water species have often disclosed their cryptic subdivision into geographically segregated genetic lineages, but the evidence so far is mainly based on mitochondrial DNA. We now present a lake-wide parallel survey of both mitochondrial and multilocus nuclear genetic structuring in the common shoreline amphipod Eulimnogammarus verrucosus, known to comprise three deep, parapatric mtDNA lineages. Allele frequencies of seven nuclear allozyme loci divide the data into three main groups whose distributions exactly match the distributions of the main mitochondrial lineages S, W, and E and involve a further division of the W cluster into two subgroups. The inter-group differences involve one to four diagnostic loci and additional group-specific alleles. The transition zones are either abrupt (1 km), occur over a long segment of uninhabitable shoreline, or may be gradual with non-coincident clinal change at different loci. Mitochondrial variation is hierarchically structured, each main lineage further subdivided into 2–4 parapatric sublineages or phylogroups, and patterns of further local segregation are seen in some of them. Despite the recurring observations of cryptic diversity in Baikalian amphipods, the geographical subdivisions and clade depths do not match in different taxa, defying a common explanation for the diversification in environmental history. Full article

(This article belongs to the Special Issue Diversity and Evolution within the Amphipoda)

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9 pages, 96135 KiB

Open AccessInteresting Images

Urban Nature Preserves as Habitats for Rare and Endemic Flora in a Scrubland and Pine Flatwoods Region of the Southeastern United States

by Mary G. Lusk

Diversity 2024, 16(11), 705; https://doi.org/10.3390/d16110705 - 20 Nov 2024

Abstract

Florida, USA, has 215 endemic or near-endemic plant species, most of which are found in scrubland and pine flatwood habitats and some of which are globally threatened or endangered. Florida is also one of the most rapidly urbanizing states in the United States, [...] Read more.

Florida, USA, has 215 endemic or near-endemic plant species, most of which are found in scrubland and pine flatwood habitats and some of which are globally threatened or endangered. Florida is also one of the most rapidly urbanizing states in the United States, and natural lands are being rapidly replaced by urban development in this state. Conservation easements and nature preserves are two tools for sustaining biodiversity in urbanizing landscapes. This collection of images documents observational research on rare and endemic wildflower species in the nature preserves of Hillsborough County, Florida (population of 1.5 million), part of the larger Tampa metropolitan area (population of 3.2 million). A two-year survey of wildflowers in 27 nature preserves dispersed throughout the county’s total 3.3 km² area observed 410 species across 97 families. Of these 410 species, there were 19 species endemic to Florida, including the critically globally endangered Florida goldenaster (Chrysopsis floridana). Each of these endemic species relies on the unique soil and hydrologic conditions of the Florida scrubland and flatwood ecosystems, and preservation of these lands amidst urban development is critical for their conservation. The objective of this work is to document the role of the nature preserves as habitats for rare and endemic wildflower species, with the goal of providing science-based support for maintaining preserve land within and near urbanizing areas. Full article

(This article belongs to the Section Biodiversity Conservation)

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15 pages, 2482 KiB

Open AccessArticle

Fish Diversity in a Little-Known Border River Between China, North Korea, and Russia, According to Traditional and eDNA Surveys

by Chen Tian, Zhixian Sun, Yutian Fang, Dong Sheng, Bo Li, Cunqi Liu and Yahui Zhao

Diversity 2024, 16(11), 704; https://doi.org/10.3390/d16110704 - 18 Nov 2024

Abstract

The Tumen River, which delineates the border between China, North Korea, and Russia, is a vital river in Northeast Asia. Understanding its current fish diversity holds significant scientific value for aquatic ecological protection. Therefore, traditional and eDNA sampling were conducted from 2022 to [...] Read more.

The Tumen River, which delineates the border between China, North Korea, and Russia, is a vital river in Northeast Asia. Understanding its current fish diversity holds significant scientific value for aquatic ecological protection. Therefore, traditional and eDNA sampling were conducted from 2022 to 2023. Integrating the historical literature with our field collection results reveals that the Tumen River has a total of 64 native fish species, of which 51 species have been surveyed in the wild. The fish composition is mainly dominated by cold-water species, with a high proportion of these being rare, endangered, and nationally protected. eDNA surveys are crucial complements in boundary rivers where traditional methods are not feasible. The results indicated that α diversity values were highest in the Hunchunhe River, attributed to the favorable natural geographical conditions and effective conservation efforts. Recently, the fish diversity in the Tumen River has been disrupted, primarily reflected in the absence of migratory species such as Oncorhynchus gorbuscha and Pseudaspius hakonensis. The study suggests that establishing nature reserves, preventing and controlling alien species, and strengthening international cooperation are key to protect fish diversity. Full article

(This article belongs to the Special Issue Applications on Environmental DNA in Aquatic Ecology and Biodiversity)

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15 pages, 4870 KiB

Open AccessArticle

Biodiversity and Abundance of Angiosperms and Environmental Resilience in the Tidal Range of Yuanjiang Dry–Hot Valley, Southwestern China

by Fengchun Yang, Qiong He, Huaping Huang, Yanmei Cui, Jianyong Gou, Chaya Sarathchandra, Kritana Prueksakorn, Kiyota Hashimoto and Li Liu

Diversity 2024, 16(11), 703; https://doi.org/10.3390/d16110703 - 18 Nov 2024

Abstract

Yuanjiang dry–hot valley is located in the southwest of mainland China. It is a sparsely vegetated area with a fragile arid ecosystem. Although the valley previously had forest cover, it has become a tropical montane savannah in recent decades. Mechanisms controlling plant species [...] Read more.

Yuanjiang dry–hot valley is located in the southwest of mainland China. It is a sparsely vegetated area with a fragile arid ecosystem. Although the valley previously had forest cover, it has become a tropical montane savannah in recent decades. Mechanisms controlling plant species distribution in such dry–hot valleys are unclear. Clarifying this will be beneficial to sustainable ecosystem management in dry–hot valleys. This study explored the relationship between diversity patterns of plant species and their environments in the lowland of this dry–hot valley. To achieve this, transects and plots were arranged along the river channel. Alpha and beta diversity indices were calculated to quantify biodiversity changes between species and environments. Estimated species, rarity, and abundance indices were also utilized to examine the correlation among species, their population size, and their environment: Species_estimated (expected number of species in t pooled plots), Singletons (the number of species with only one individual in t pooled plots), Uniques (the number of species living in one plot in t pooled plots), ACE (species richness estimator with coverage-based abundance), ICE (species richness estimator with coverage-based incidence), and Chao2 (species richness estimator extrapolated from Singletons). Fifty years of meteorological records, including temperature and precipitation, were utilized as climate variables. The results indicated the following findings: (1) alpha diversity was higher closer to the river, whereas the beta diversity was higher towards the lower sections of the river (Bray–Curtis < 0.5), but this trend was reversed in the perpendicular transects; (2) total phosphorous (TP) and total potassium (TK) were higher on flatter ground, tending to be associated with raised nitrogen (TN) and organic matter (OM); (3) soil nutrients were higher towards the lower sections of the river, corresponding to an increased number of species; (4) water supply determined plant distribution, with soil condition determining water retention; (5) the estimated species and their rarity and abundance indices were associated with proximity to the river, indicating heterogeneity of habitats and soil condition; and (6) fern species could be used as indicators representing the xeric environment of Yuanjiang dry–hot valley. Plant cover was reduced at low altitudes, with high temperatures and a low water supply. These results draw attention to the need for specific policy formation to protect the microhabitats and manage the environment of the Yuanjiang valley. Full article

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1 pages, 168 KiB

Open AccessRetraction

RETRACTED: Quintero-Castañeda et al. Assessing Mercury Contamination Levels in the Sediments of Two Pyrenean Lakes. Diversity 2024, 16, 627

by Cristian Yoel Quintero-Castañeda, Luis Roberto Hernández-Angulo, Daniel Tobón-Vélez, Anamaría Franco-Leyva and María Margarita Sierra-Carrillo

Diversity 2024, 16(11), 702; https://doi.org/10.3390/d16110702 - 18 Nov 2024

Abstract

The journal retracts the article, “Assessing Mercury Contamination Levels in the Sediments of Two Pyrenean Lakes” [...] Full article

16 pages, 1395 KiB

Open AccessArticle

Effects of Rubber Plantation Restoration in National Parks on Plant Diversity and Soil Chemical Properties

by Chunyan Du, Donghai Li, Weifeng Wang, Xiaobo Yang, Zhixiang Wu, Chuan Yang, Yingying Zhang, Qingmao Fu and Dongling Qi

Diversity 2024, 16(11), 701; https://doi.org/10.3390/d16110701 - 18 Nov 2024

Abstract

Plantations left for natural succession play a significant role in Tropical Rainforest National Parks. Studying the succession and restoration of plantations is crucial for achieving a park’s authenticity and integrity, as well as for maximizing its ecological functions. However, the changes in vegetation [...] Read more.

Plantations left for natural succession play a significant role in Tropical Rainforest National Parks. Studying the succession and restoration of plantations is crucial for achieving a park’s authenticity and integrity, as well as for maximizing its ecological functions. However, the changes in vegetation and soil properties during the natural succession of these decommissioned plantations remain unclear. In this study, we examined rubber [(Hevea brasiliensis (Willd. Ex A. Juss.) Muell. Arg] plantations in the Yinggeling area of the National Park of Hainan Tropical Rainforest. We used community surveys, field sampling, and soil property analyses to investigate the species richness, diversity, and species composition of the aboveground plant communities during three succession periods of rubber plantations left for natural succession, including 0 years (ZY), 3 years (TY), and 7 years (SY). The soil pH, total organic carbon, total nitrogen, total phosphorus, available phosphorus, nitrate nitrogen, ammonium nitrogen, and total potassium contents in the three succession periods were analyzed. These results showed that there were 92 species of understory plants in the decommissioned rubber plantations, belonging to 72 genera in 39 families. The highest number of understory plant species was found in the plantations with 3 years of natural succession, totaling 66 species from 49 genera in 29 families. The number of families, genera, and species followed the pattern TY > SY > ZY. The Margalef richness index (F), Simpson index (D), and Shannon–Wiener index (H) of understory plants in the 0-year succession plantations were significantly lower than those in the 3-year and 7-year succession plantations. However, there was no significant difference in the Pielou (EH) index among the succession gradients. The soil pH, nitrate nitrogen (NO3--N), and available phosphorus (AP) in the 0-year succession plantations were significantly higher than those in the 3-year and 7-year succession plantations. There were no significant differences in soil total nitrogen (TN), total phosphorus (TP), total organic carbon (TOC), and ammonium nitrogen (NH4+-N) across the three succession gradients. The soil total potassium (TK) in the 3-year succession plantations was significantly higher than that in the 0-year and 7-year succession plantations. Soil available phosphorus and total phosphorus (TP) were positively correlated with the Margalef index, Simpson index, Shannon–Wiener index, and Pielou index. The recovery rate of understory vegetation in decommissioned rubber plantations was faster than that of the soil. This indicates that the construction of the National Park of Hainan Tropical Rainforest has significantly promoted the recovery of the number of plant species and plant species diversity that have been left from rubber plantation operations. These findings not only deepen our understanding of soil property changes during the vegetation succession of artificial forests, particularly rubber plantations, but they also hold significant implications for guiding tropical forest management and sustainable development. Full article

(This article belongs to the Special Issue Biodiversity Conservation Planning and Assessment)

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16 pages, 3545 KiB

Open AccessArticle

Higher Soil Mesofauna Abundance and Microbial Activities Drive Litter Decomposition in Subtropical Forests

by Hong Lin, Qin Kong, Xinyu Xu, Xingbing He, Yonghui Lin, Zaihua He, Yuehong Gao and Xiangshi Kong

Diversity 2024, 16(11), 700; https://doi.org/10.3390/d16110700 - 17 Nov 2024

Abstract

Soil fauna play an important role in litter decomposition and affect the “home-field advantage” (HFA) of litter decomposition. However, how this effect is modulated by the microenvironment needs further investigation. We conducted a reciprocal transplant experiment of litter decomposition using different mesh-size litterbags [...] Read more.

Soil fauna play an important role in litter decomposition and affect the “home-field advantage” (HFA) of litter decomposition. However, how this effect is modulated by the microenvironment needs further investigation. We conducted a reciprocal transplant experiment of litter decomposition using different mesh-size litterbags across litter and soil layers in subtropical coniferous (Pinus massoniana) and broad-leaved (Quercus variabilis) forests. Our results revealed a pronounced HFA in P. massoniana. P. massoniana litter decomposed faster in its home habitat by 40.6% in the litter layer and 10.2% in the soil layer in coarse mesh bags and by 21.8% in the litter layer and 21.4% in the soil layer in fine mesh bags. However, Q. variabilis litter showed faster decomposition in its home soil layer by 10.8% and 4.3% for coarse and fine mesh bags, whereas in the litter layer it decomposed faster in the away habitat by 16.7% and 20.6% for coarse and fine mesh bags, respectively. Higher soil mesofauna abundance and microbial activities in the coniferous forest compared to the broad-leaved forest drive the observed HFA of litter decomposition. Especially in the litter layer, the abundance of mesofauna was 89.8% higher in the coniferous forest. Coarse mesh bags generally facilitated a higher decomposition rate across litter and soil layers, likely due to a better interaction between soil mesofauna and extracellular enzyme activity. The HFA index exhibited distinct seasonal fluctuations, peaking in October for coarse mesh bags and in April for fine mesh bags within the litter layer, while soil layer peaks occurred in August and April. Notably, an increase in Acarina abundance strongly correlated with enhanced decomposition and HFA effects in the litter layer during October. This study revealed the sensitivity of HFA to the soil layer and soil fauna and underscores the complex role of the microclimate in shaping interactions among soil microorganisms, litter quality, and mesofauna, thereby enriching our understanding of litter decomposition dynamics in forest ecosystems. Full article

(This article belongs to the Special Issue Microbial Community Dynamics in Soil Ecosystems)

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40 pages, 42482 KiB

Open AccessArticle

Mites from the Suborder Uropodina (Acari: Mesostigmata) in Bory Tucholskie National Park—One of the Youngest National Parks in Poland

by Jerzy Błoszyk, Jacek Wendzonka, Karolina Lubińska, Marta Kulczak and Agnieszka Napierała

Diversity 2024, 16(11), 699; https://doi.org/10.3390/d16110699 - 14 Nov 2024

Abstract

The state of research into acarofauna in Polish national parks is very uneven. One of the least examined areas in this regard is Bory Tucholskie National Park (BTNP), established in 1996. The aim of the current research was to explore the species diversity [...] Read more.

The state of research into acarofauna in Polish national parks is very uneven. One of the least examined areas in this regard is Bory Tucholskie National Park (BTNP), established in 1996. The aim of the current research was to explore the species diversity and community structure of mites from the suborder Uropodina (Acari: Mesostigmata), inhabiting different forest, open, and unstable microhabitats in the area of BTNP. Based on the analysis of over 300 samples collected in BTNP between 2004 and 2024, 29 taxa of Uropodina were identified, with 3839 specimens found in the analyzed material. The highest species diversity has been observed in different types of pine forests (19 species), in transformed alder and alder forests (15 species, each), and in reeds (12 species), while the lowest diversity occurred in peat bog areas (8 species) and inland dunes (5 species). The spatial distribution analyses for Uropodina in the area of BTNP have been made and distribution maps for each species have been drawn. Moreover, the Maturity Index (MI) was also calculated to compare the species diversity of the Uropodina communities in BTNP with those in other Polish national parks. The Uropodina community in BTNP ranked eighth in terms of species richness among 13 national parks explored in Poland so far. Finally, the comparative analysis of the MI for the selected Polish national parks has revealed that BTNP could be ranked fourth in terms of the faunistic value for the discussed mite group. Full article

(This article belongs to the Special Issue Diversity and Ecology of the Acari)

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10 pages, 1860 KiB

Open AccessArticle

How to Count Parrots: Comparing the Performance of Point and Transect Counts for Surveying Tasman Parakeets (Cyanoramphus cookii)

by Michael John Adam Skirrow, Luis Ortiz-Catedral and Adam N. H. Smith

Diversity 2024, 16(11), 698; https://doi.org/10.3390/d16110698 - 14 Nov 2024

Abstract

Obtaining precise estimates of population size and trends through time is important for the effective management and conservation of threatened species. For parrots (Psittaciformes: Psittacidae), obtaining such estimates can be challenging, particularly for cryptic species that occur in low densities in complex and/or [...] Read more.

Obtaining precise estimates of population size and trends through time is important for the effective management and conservation of threatened species. For parrots (Psittaciformes: Psittacidae), obtaining such estimates can be challenging, particularly for cryptic species that occur in low densities in complex and/or fragmented habitats. We used a statistical resampling approach with the aim to compare the reliability and precision of counts for the critically endangered Tasman parakeet (Cyanoramphus cookii) that were taken using two methods on Norfolk Island (Pacific Ocean), namely, fixed-point counts and line transect counts. The detections obtained during fixed-point counts had better estimated precision (0.274) than line transect counts (0.476). The fixed-point method was also more efficient, yielding 1.338 parakeet detections per count compared to the 0.642 parakeet detections per count obtained by the line transect method. Although Tasman parakeets can be detected by either of these methods, our research demonstrates that the fixed-point method is more precise and reliable. These findings can help prioritise resources for the long-term monitoring of recovering populations of this species and similar island species. Full article

(This article belongs to the Special Issue Ecology and Conservation of Parrots)

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9 pages, 4975 KiB

Open AccessInteresting Images

Finding a Pied-à-Terre: Harbour Infrastructure Facilitates the Settlement of Non-Native Corals (Tubastraea spp.) in the Southern Caribbean

by Bert W. Hoeksema, Roeland J. van der Schoot and Kaveh Samimi-Namin

Diversity 2024, 16(11), 697; https://doi.org/10.3390/d16110697 - 14 Nov 2024

Abstract

Semi-submersible platforms are used in the offshore oil and gas industry. They are specialised marine vessels that float on submersed drafts, which are composed of pontoons and columns and can serve as habitats for biofouling marine benthic communities. When these vessels sail from [...] Read more.

Semi-submersible platforms are used in the offshore oil and gas industry. They are specialised marine vessels that float on submersed drafts, which are composed of pontoons and columns and can serve as habitats for biofouling marine benthic communities. When these vessels sail from one place to another, either by using their own propellers or being towed, they can act as vectors for introducing non-native marine species. To establish themselves in new areas, these exotic species require suitable benthic habitats. Artificial substrates, such as harbour infrastructure where such vessels are moored, appear to be highly suitable for this purpose. In the present study, a mooring buoy and a harbour piling at Curaçao (southern Caribbean), frequently used by semi-submersible platforms, were found to be colonised by the sun corals Tubastraea coccinea and T. tagusensis at shallow depths. This report presents the first record of T. tagusensis as an introduced non-native species in the southern Caribbean, highlighting the potential role of harbour infrastructure in facilitating coral settlement at depths shallower than those typically observed. These findings underscore the ecological impact of artificial substrates in supporting invasive species and emphasise the need for monitoring programs and defouling facilities. Full article

(This article belongs to the Collection Marine Invasive Species)

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17 pages, 4874 KiB

Open AccessArticle

Aggregate Size Mediated the Changes in Soil Microbial Communities After the Afforestation of a Former Dryland in Northwestern China

by Deming Zhang, Ling Bai, Wei Wang, Yanhe Wang, Tiankun Chen, Quan Yang, Haowen Chen, Shuning Kang, Yongan Zhu and Xiang Liu

Diversity 2024, 16(11), 696; https://doi.org/10.3390/d16110696 - 13 Nov 2024

Abstract

Although the afforestation of former arable lands is a common global land-use conversion, its impact on soil microbial communities at the aggregate scale has not been adequately addressed. In this study, soil samples were categorized into large macroaggregates (LM, >2 mm), small macroaggregates [...] Read more.

Although the afforestation of former arable lands is a common global land-use conversion, its impact on soil microbial communities at the aggregate scale has not been adequately addressed. In this study, soil samples were categorized into large macroaggregates (LM, >2 mm), small macroaggregates (SM, 2–0.25 mm), and microaggregates (MI, <0.25 mm) to assess the changes in microbial composition, diversity, network complexity, and network stability within soil aggregates after the afforestation of a former dryland in northwestern China. The results revealed that afforestation enhanced the relative abundance of Actinobacteriota, Chloroflexi, Ascomycota, and Mortierellomycota within the soil aggregates, suggesting that these phyla may have greater advantages in microbial communities post-afforestation. The Shannon–Wiener and Pielou indices for bacterial communities showed no significant differences between land-use types across all aggregate fractions. However, the alpha diversity of fungal communities within the LM and SM significantly increased after afforestation. Bray–Curtis dissimilarity indices showed that afforestation altered bacterial beta diversity within the LM and MI but had a minimal impact on fungal beta diversity across all three aggregate fractions. The topological features of cross-kingdom microbial co-occurrence networks within the soil aggregates generally exhibited a decreasing trend post-afforestation, indicating a simplification of microbial community structure. The reduced robustness of microbial networks within the LM and SM fractions implies that afforestation also destabilized the structure of microbial communities within the macroaggregates. The composition of the soil microbial communities correlated closely with soil carbon and nitrogen contents, especially within the two macroaggregate fractions. The linkages suggests that improved resource conditions could be a key driver behind the shifts in microbial communities within soil aggregates following afforestation. Our findings indicate that the impact of afforestation on soil microbial ecology can be better understood by soil aggregate fractionation. Full article

(This article belongs to the Special Issue Microbial Community Dynamics in Soil Ecosystems)

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