Undara Lava Cave Fauna in Tropical Queensland with an Annotated List of Australian Subterranean Biodiversity Hotspots
Abstract
:1. Introduction
2. Materials and Methods
3. Geology, Geomorphology, Hydrology
4. Environment
4.1. Surface
4.2. Underground
5. Results
5.1. Overview of Invertebrate Sampling in the Undara Basalt Lava Tube Systems
- Minimally 78 species of arthropods have been recorded from Undara Basalt lava tubes, along with a cavernicolous fern (Psilotum sp.) and four bat genera (Hipposideros, Miniopterus, Rhinolophus, Vespadelus).
- Of the arthropods: 16 (21%) have been taxonomically described; 30 (39%) identified to genus and/or morpho-species; and 32 (40%) remain unidentified to species or genus level.
- Seven caves harboured obligate subterranean species; all these caves contained deep zone environments with high humidity, of which three also contained bad air (CO2).
- Overall, 30 troglobionts and one stygobiont species were recorded in the Undara Basalt Flow (Table 3). Bayliss Cave harboured the most obligate subterranean species: 23 troglobionts and one stygobiont.
- Twenty-two species of arthropods and one plant are classified as troglophiles, being native cavernicoles capable of living their entire life cycle underground but populations of the same species may also be found in surface habitats (Table S1) [2,21,30,32,50,51,52,53,54]. Some of these may prove to be troglobionts once more is known of their biology.
- Twenty-five species of arthropods are classified as ‘visitors’ (Table S2) [2,30,35,55,56]. Some habitually use caves for shelter or to find food (=trogloxenes). Others occasionally enter caves for shelter, and some wander or fall into caves accidentally (=‘incidental’ or ‘accidental’ cavernicoles). In addition, unidentified mites (Arachnida: Acari) have been reported from most surveyed caves. Many are associated with guano, and a few are parasites of other cavernicoles including bats; however, because both the identity and ecological status of the mites recorded from Undara caves are unknown, they are not enumerated further in Table S2.
- Besides Bayliss, the other caves with a high diversity of troglobionts are Nasty Cave (eight species) and Barkers Cave (seven species), which are located, respectively, 3 km and 3.7 km downflow of Bayliss (Figure 4).
5.2. Bayliss Cave Environment
5.3. Bayliss Cave Invertebrate Fauna Distribution
5.4. Notable Cave Species
5.4.1. Aquatic Fauna
5.4.2. Terrestrial Fauna
6. Discussion
6.1. The Challenge of Classifying Cavernicoles
6.2. Why Is Bayliss Cave So Rich in Troglobionts?
6.3. Comparison with Other Subterranean Hotspots in Australia
- Undara remains the richest subterranean hotspot in humid tropical Australia, which far exceeds the richness of troglobionts recorded in other humid tropical Australian karsts such as Judburra-Gregory [89].
- In the arid Yilgarn and semi-arid Pilbara regions of Western Australia significantly richer subterranean assemblages have been documented in recent decades.
- Most Western Australian hotspots in calcretes and iron-ore terrains do not contain enterable caves, and fauna can only be collected by sampling mesocaverns and microcaverns via constructed wells and drill holes.
- In Eastern Australia, the Jenolan karst in New South Wales recorded the highest species richness (136 taxa) however the majority of these are accidentals and troglophiles, and only 8 taxa are obligate cavernicoles [100].
- Overall species richness in warm temperate (New South Wales) [101,102,103] and cool temperate (Tasmania) [104] karst areas is comparable (median 54 taxa), and these karsts harbour a much lower proportion of obligate subterranean species compared with arid and semi-arid regions, although Tasmania stands out in terms of troglobiont richness in temperate latitudes (maximum 25 species at Precipitous Bluff, Tasmania) [104,105,106,107,108].
- The Peel Valley alluvial aquifer in New South Wales harbours the richest known stygofauna assemblage in eastern Australia; 54 species including 33 stygobionts [109].
- In terms of obligate species, the richest Australian localities are in arid and semi-arid climate regions, where most of the troglobionts and stygobionts are relictual with no close surface relatives. Molecular phylogenetic studies have shown that Quaternary aridification is the likely driving mechanism for troglo/stygogenesis in these regions [110].
Geographic/Climate Region | Locality Name; Geology, Hydrology Type | Total spp. Richness (No. Sb/Tb) * | Stygofauna spp. (Sb) * | Troglofauna spp. (Tb) * | Sources |
---|---|---|---|---|---|
Queensland, humid tropical | Undara Basalt lava tubes | 77 (31) | 1 (1) | 76 (30) | [2], and text |
Northern Territory, humid tropical | Judbarra-Gregory karst | 56 (7) | 3 (2) | 53 (5) | [89] |
Yilgarn, WA, arid | Yeelirrie calcrete aquifer | 115 (*) | 70 (*) | 45 (*) | |
Yilgarn, WA, arid | Uramurdah calcrete | 45 (*) | 36 (*) | 9 (*) | [90,91,92] |
Yilgarn, WA, arid | Hinkler Well calcrete | 41 (*) | 32 (*) | 9 (*) | [95] |
Yilgarn, WA, arid | Lake Violet calcrete | 39 (*) | 35 (*) | 4 (*) | [95] |
Yilgarn, WA, arid | Barwidgee calcrete | 37 (*) | 28 (*) | 9 (*) | [95] |
Pilbara, WA, arid/semi-arid | Ethel Gorge calcrete aquifer | 84 (45) | 84 (45) | 0 | [95] |
Pilbara, WA, arid/semi-arid | Cape Range karst | 83 (*) | 42 (*) | 41 (*) | |
Pilbara, WA, arid/semi-arid | Barrow Island karst | 74 (*) | 56 (*) | 18 (*) | [94] |
Pilbara, WA, arid/semi-arid | Well PSS016, Robe River calcrete aquifer | 54 (*) | 54 (*) | 0 | [82,98] |
Pilbara, WA, arid/semi-arid | Mesa A iron pisolite, Robe Valley | 24 (*) | 0 | 24 (*) | [83,99] |
New South Wales, warm temperate | Jenolan karst | 136 (8) | 10 (2) | 126 (6) | [85,97] |
New South Wales, warm temperate | Wombeyan karst | 55 (7) | 5 (2) | 50 (5) | [96] |
New South Wales, warm temperate | Wee Jasper karst | 53 (7) | 5 (3) | 48 (4) | |
New South Wales, warm temperate | Peel Valley alluvial aquifer | 54 (33) | 54 (33) | 0 | [100] |
Tasmania, cool temperate | Ida Bay karst | 65 (18) | 17 (6) | 48 (12) | [101,102,103] |
Tasmania, cool temperate | Junee Florentine karst | 60 (20) | 17 (8) | 43 (12) | [101,102,103] |
Tasmania, cool temperate | Precipitous Bluff karst | 37 (25) | 11 (11) | 26 (14) | [109] |
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Basalt Flows (40Ar/39Ar Age, ka/ma) | Lava Tube Systems (Length)/Number of Known Caves | Sampled Caves by Tube System from Crater | Remarks |
---|---|---|---|
Kinrara (40Ar/39Ar Age 7 ± 2 ka, 2σ) | 2 tube systems, 11 caves/arches | none | Approximately 25 km SE Undara crater, potentially important for biology. |
Murronga (40Ar/39Ar Age 153 ± 5 ka, 2σ) | 2 tubes, 12 caves with combined survey length of 1.2 km | Collins No. 1, Collins No. 2, Two Ten, Long Shot | Approximately 15 km S of Undara Crater, potentially important for biology. Major caves with significant fauna. |
Undara (40Ar/39Ar Age 189 ± 4 ka, 2σ) | 5 tube systems, ~67 caves/arches with combined survey length of 6.38 km | N-NE system: Hot Hole, Wishing Well. N system: Stephens NW system: 10 caves. W system: none E system: none Other: Secret No. 1 and 2 | Fauna collection records obtained from 17 caves, all except 3 sampled caves occur in NW system. 70% of known caves occur in the NW tube system. |
Racecourse ~ 0.20 ma | 1 tube, 4 caves | None sampled | Caves reported in Pearson [35], not sampled. |
Boomerang ~ 0.23 ma | None recorded | - | - |
Razorback < 0.27 ma | None recorded | - | - |
Silent Hill ~ 0.37 ma | 1 tube system, 1 cave | Kenny Cave SH-1 | Located within 3 km of Undara NW tube system, potentially important for biology. |
Mount Joy < 0.40 ma | None recorded | - | - |
Middle Mountain ~ 0.89 ma | None recorded | - | - |
Older basalt < 3.00 ma | None recorded | - | - |
Tube System | Cave Name (No. *) | Length | Elevation | Environment | Fauna |
---|---|---|---|---|---|
Northwest | Michael’s (no #) | 15 m | 975 m | All twilight | Twilight zone fauna |
Northwest | Taylor (U-4) | 108 m | 950 m | Deep Zone | A few troglobionts, bats |
Northwest | Pinwell (U-17) | 150 m | 850 m | Deep Zone | A few troglobionts, bats |
Northwest | Wind tunnel (U-42) | 293 m | 800 m | Two entrances, limited deep zone | A few possible troglobionts, bats |
Northwest | Lost World (U-37) | 74 m | 775 m | Two entrances, well-ventilated, transition zone | Blattodea: Macropanesthia rhinoceros, bats |
Northwest | Picnic (U-24; U-25) | ~450 m | 740 m | Permanent pool, sump, humid, deep zone | Unidentified moths, isopods, beetles, crickets, spiders, bats |
Northwest | Daves (upflow) (U-26)) | 50 m | 730 m | Limited dark zone | Lepidoptera: Euploia sp. aff. core; unid. spider, phalangid, moths, beetles, bugs, cockroaches, ants, wasps, bats |
Northwest | Daves II (U-27) | 27 m | 730 m | Limited dark zone | Lepidoptera: Euploia sp. aff. core; unid. spider, phalangid, moths, beetles, bugs, cockroaches, ants, wasps, bats |
Northwest | Road (U-28) | 220 m | 700 m | Mostly twilight, intermittent stream | Stygobiont Amphipoda: Chillagoe sp.; many surface arthropods in leaflitter |
Northwest | Bayliss (U-30) | 1300 m | 700 m | Hot humid bad air | 23 troglobionts, one stygobiont, bats |
Northwest | Nasty (U-46) | 127 m | 670 m | Hot, humid, bad air | 8 troglobionts, bats |
Northwest | Darcy (U-31) | 99 m | 670 m | Limited deep, elevated CO2 | trogloxenes and accidentals, bats |
Northwest | Barkers (U-34) | 560+ m | 625 m | Deep zone, Lake at end | 7 troglobionts, bats |
Tributary of Northwest | Secret Cave No. 1 (U-67) | 150 m | ~825 m | Deep zone | Blind cockroaches |
North-NE | Stephens (=Stevens) Cave (U-16) | 70 m | 880 m | Mostly transition zone | Troglophilic cockroach, bats |
Northern | Hot Hole (U-51) | 172 m | ~760 m | Warm, bad air, deep guano | Unid. spider, troglophilic cockroach, bats |
Northern | Wishing Well (U-52) | 104 m | ~750 m | Humid, bad air | Unid. spider, troglophilic cockroach, slater, bats |
# | SB/TB | Species | Taxonomic Classification | Caves * | References |
---|---|---|---|---|---|
1 | SB | Chillagoe n. sp. | Crustacea: Amphipoda: Chillagoeidae | U-28; U-30 | [57] |
2 | TB | Unidentified genus and species 1 | Crustacea: Isopoda: Porcellionidae | U-30; U-17 | [2] |
3 | TB | Unidentified genus and species 2 | Crustacea: Isopoda: Porcellionidae | U-30; U-17 | [2] |
4 | TB | Unidentified genus and species 3 (eyeless) | Crustacea: Isopoda: Oniscoidea | U-34 | [30] |
5 | TB | Unidentified genus and species 1, juvenile | Arachnida: Schizomida: Hubbardiidae | U-34 | [58] |
6 | TB | Protochelifer sp. nr. cavernarum Beier | Arachnida: Pseudoscorpionida: Cheliferidae | U-42; U-17 | [30,59] |
7 | TB | Amauropelma undara Raven et al. | Arachnida: Araneae: Ctenidae | U-30; U-46 | [60] |
8 | TB | Unidentified genus and species 1 | Arachnida: Araneae: Linyphiidae | U-30 | [2] |
9 | TB | Nesticella sp. 1 | Arachnida: Araneae: Nesticidae | U-30 | [61] |
10 | TB | Unidentified genus and species | Arachnida: Araneae: Oonopidae | U-30 | [1] |
11 | TB | Spermophora sp. 1 | Arachnida: Araneae: Pholcidae | U-30 | [62] (p. 239); [2] |
12 | TB | Spermophora sp. 2 | Arachnida: Araneae: Pholcidae | U-34 | [30,63] |
13 | TB | Dolomedes sp. 1 | Arachnida: Araneae: Pisauridae | U-34 | [30] |
14 | TB | Nosterella cavicola Baehr and Jocqué. | Arachnida: Araneae: Zodariidae | U-30; U-46 | [64] |
15 | TB | New genus and species | Chilopoda: Scutigeromorpha: Scutigeridae | U-30; U-34; U-46 | [2] |
16 | TB | Unidentified genus and species | Diplopoda: Spirostreptida | U-30; U-46; U-34 | [2] |
17 | TB | Unidentified genus and species 1 | Diplopoda: Polydesmida | U-30 | [2] |
18 | TB | Unidentified genus and species 2 | Diplopoda: Polydesmida | U-30 | [2] |
19 | TB | Unidentified genus and species 1 | Diplopoda: Polyxenida | U-30; U-46 | [2] |
20 | TB | Pseudosinella sp. 1 | Collembola: Entomobryidae | U-30; U-34 | [2] |
21 | TB | Unidentified genus and species | Collembola: | U-30; U-46 | [2] |
22 | TB | Neotemnopteryx baylissensis Slaney | Insecta: Blattodea: Ectobiidae | U-30; SH-1 | [65] |
23 | TB | Nocticola sp. 1 | Insecta: Blattodea: Nocticolidae | U-30; U-46; U-17 | [66] |
24 | TB | New genus and species 1 | Insecta: Coleoptera: Curculionidae: Entiminae | U-30 | [67] |
25 | TB | New genus and species 2 | Insecta: Coleoptera: Curculionidae: Entiminae | U-4 | [67] |
26 | TB | Unidentified genus and species | Insecta: Coleoptera: Pselaphinae | U-30 | [2] |
27 | TB | Unidentified genus and species | Insecta: Coleoptera: Staphylinidae | U-30; U-34 | [2] |
28 | TB | Unidentified genus and species | Insecta: Diplura | U-30 | [2] |
29 | TB | Solonaima baylissa Hoch and Howarth | Insecta: Auchenorrhyncha: Cixiidae | U-30; U-46 | [68] |
30 | TB | Micropolytoxus cavicolus Malipatil and Howarth | Insecta: Heteroptera: Reduviidae | U-30; U-34 | [42] |
31 | TB | Peirates sp. 1 | Insecta: Heteroptera: Reduviidae | U-30 | [2] |
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Eberhard, S.M.; Howarth, F.G. Undara Lava Cave Fauna in Tropical Queensland with an Annotated List of Australian Subterranean Biodiversity Hotspots. Diversity 2021, 13, 326. https://doi.org/10.3390/d13070326
Eberhard SM, Howarth FG. Undara Lava Cave Fauna in Tropical Queensland with an Annotated List of Australian Subterranean Biodiversity Hotspots. Diversity. 2021; 13(7):326. https://doi.org/10.3390/d13070326
Chicago/Turabian StyleEberhard, Stefan M., and Francis G. Howarth. 2021. "Undara Lava Cave Fauna in Tropical Queensland with an Annotated List of Australian Subterranean Biodiversity Hotspots" Diversity 13, no. 7: 326. https://doi.org/10.3390/d13070326
APA StyleEberhard, S. M., & Howarth, F. G. (2021). Undara Lava Cave Fauna in Tropical Queensland with an Annotated List of Australian Subterranean Biodiversity Hotspots. Diversity, 13(7), 326. https://doi.org/10.3390/d13070326