Diversity, Evolution and Conservation Ecology of Aquatic Species

A special issue of Diversity (ISSN 1424-2818). This special issue belongs to the section "Freshwater Biodiversity".

Deadline for manuscript submissions: closed (20 September 2024) | Viewed by 1544

Special Issue Editors


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Guest Editor
Department of Biology, University of the Ozarks, Clarksville, AR 72830, USA
Interests: community ecology; conservation; human–wildlife conflict; population ecology; species ranges

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Guest Editor
Department of Biological Sciences, University of Calgary, Calgary, T2N 1N4 AB, Canada
Interests: biodiversity; conservation genetics; local adaptation; phylogeography; population structure; predation; speciation

Special Issue Information

Dear Colleagues,

Water covers 71% of the Earth’s surface, with approximately 96.5% being found in oceans as salt water and 3.5% existing as fresh water. However, only 0.3% of fresh water (covering 0.01% of the Earth’s surface) is found in lakes, rivers, and streams. Despite the dramatic difference in total coverage, the disparity in described diversity in marine vs. freshwater ecosystems is considerably smaller (~240,000 species vs. ~125,000 species, respectively), highlighting that oceans are vastly underexplored and freshwater ecosystems promote high levels of biodiversity. For example, there are an estimated 1200 (mostly endemic) species of cichlids found in Lakes Victoria, Malawi, and Tanganyika. Sadly, the threats to aquatic ecosystems are many, and include pollutants, extraction, habitat loss, and exotic species. Accordingly, many groups of aquatic species are at risk. For example, 20.3% of crabs are categorized by IUCN as critically endangered, endangered, or vulnerable.

This Special Issue of Diversity seeks papers that further our knowledge of the factors promoting diversification and evolution, as well as those that explicitly apply ecological and evolutionary principles to the conservation and management of aquatic species. We welcome submissions that operate at a local to global scale, are focused on single species to higher level taxonomic units, and communities to ecosystems, covering marine, brackish, and freshwater systems. Diverse approaches are welcome, including controlled and natural experiments, genetic/genomic studies, modelling, and reviews.

Dr. Christie Sampson
Prof. Dr. Steven Vamosi
Guest Editors

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Keywords

  • aquatic species
  • biogeography
  • conservation ecology
  • diversity
  • evolution
  • genomics
  • macroevolution
  • phylogenetics

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Published Papers (1 paper)

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Research

18 pages, 2939 KiB  
Article
Migratory Ecology of Pseudoplatystoma fasciatum in the Amazon Basin Revealed by Otolith Microchemistry
by Luciana A. Pereira, Leandro Castello, Eric Hallerman, Donald Orth and Fabrice Duponchelle
Diversity 2024, 16(7), 378; https://doi.org/10.3390/d16070378 - 29 Jun 2024
Viewed by 972
Abstract
Fish migrate for varied reasons, including to avoid predators and to access feeding, spawning, and nursery habitats, behaviors that enhance their survival and reproductive rates. However, the migratory ecology of many important fishes, especially those in river–floodplain ecosystems, remains poorly understood. One fish [...] Read more.
Fish migrate for varied reasons, including to avoid predators and to access feeding, spawning, and nursery habitats, behaviors that enhance their survival and reproductive rates. However, the migratory ecology of many important fishes, especially those in river–floodplain ecosystems, remains poorly understood. One fish of the Amazon Basin whose migratory behavior is poorly understood is the catfish Pseudoplatystoma fasciatum. Here, we used otolith elemental microchemistry to characterize the migration ecology of P. fasciatum in the Amazon Basin. The main research questions of this study were: (1) does P. fasciatum move between waters with different Sr isotopic signatures (87Sr/86Sr) and chemical compositions? (2) What distance do they migrate? (3) Is the migration of P. fasciatum related to age? And (4) does P. fasciatum migrate mainly upstream, downstream, or in both directions? We assessed whether P. fasciatum migrates between waters with different 87Sr/86Sr values, comparing the Sr isotopic signature of otolith transects of each individual with the range of Sr isotopic signatures within the respective rivers. We found that 34% of the 71 fish analyzed migrated between rivers with different Sr isotopic signatures and 66% did not. The mean migration distance migrated was 126 km, with most specimens migrating between 72 and 237 km. Apparently, no fish of age one or age six or older migrated. All fish that migrated were between two and five years of age, with 20% of the specimens that migrated being two years old, 40% three years old, 30% four years old, and 20% five years old. Sixty-six percent of all individuals that migrated between rivers with different Sr signatures did so bidirectionally, while 33% moved unidirectionally. According to our definition of homing behavior in which fish migrated back to the same river where they were born, 41% of all fish that migrated displayed apparent homing behavior. Our findings provide insights into the migratory ecology of P. fasciatum, corroborating and refining knowledge reported in the literature. Our results on the migratory ecology of P. fasciatum have implications for sustainable fisheries conservation and management: conserving P. fasciatum requires habitat maintenance and suitable fishing practices in spawning and nursery habitats, and managers must consider large geographic areas for effective fishery management and conservation. Full article
(This article belongs to the Special Issue Diversity, Evolution and Conservation Ecology of Aquatic Species)
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