TY - JOUR
T1 - Thermal limits and preferences of large branchiopods (Branchiopoda
T2 - Anostraca and Spinicaudata) from temporary wetland arid zone systems
AU - Tladi, Murphy
AU - Wasserman, Ryan J.
AU - Cuthbert, Ross N.
AU - Dalu, Tatenda
AU - Nyamukondiwa, Casper
N1 - Funding Information:
We acknowledge the support from Botswana International University of Science and Technology (BIUST) by providing infrastructure and funding to MT, CN and RJW. Gratitude is extended to the Department of Physics and Astronomy (BIUST) for equipment use and to D. Christopher Rogers for assistance in large branchiopod identification. The Ministry of Environment, Natural Resources Conservation and Tourism (Botswana) is thanked for the issuing of a research permit (ENT 8/ 36/4XXXXII [14]). RC acknowledges funding from the Alexander von Humboldt Foundation .
Funding Information:
We acknowledge the support from Botswana International University of Science and Technology (BIUST) by providing infrastructure and funding to MT, CN and RJW. Gratitude is extended to the Department of Physics and Astronomy (BIUST) for equipment use and to D. Christopher Rogers for assistance in large branchiopod identification. The Ministry of Environment, Natural Resources Conservation and Tourism (Botswana) is thanked for the issuing of a research permit (ENT 8/ 36/4XXXXII [14]). RC acknowledges funding from the Alexander von Humboldt Foundation.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/7
Y1 - 2021/7
N2 - Large branchiopods are specialist crustaceans adapted for life in temporary, thermally dynamic wetland ecosystems. Certain large branchiopod species are, however, restricted to specific temporary wetland types, exemplified by their physico-chemical and hydroperiod characteristics. Here, we contrasted the thermal preference and critical thermal maxima (CTmax) and minima (CTmin) of southern African anostracans and spinicaudatans found exclusively in either temporary rock-pool or pan wetland types. We hypothesized that environment of origin would be a good predictor of thermal preference and critical thermal limits. To test this, Branchiopodopsis tridens (Anostraca) and Leptestheria brevirostris (Spinicaudata) were collected from rock-pool habitats, while Streptocephalus cafer (Anostraca) and a Gondwanalimnadia sp. (Spinicaudata) were collected from pan habitats. In contrast to our hypothesis, taxonomic relatedness was a better predictor of CTmax and temperature preference than environment of origin. Spinicaudatans were significantly more tolerant of high temperatures than anostracans, with L. brevirostris and Gondwanalimnadia sp. median CTmax values of 45.1 °C and 44.1 °C, respectively, followed by S. cafer (42.8 °C) and B. tridens (41.4 °C). Neither environment or taxonomic relatedness were good predictors of CTmin trends, with B. tridens (0.9 °C) and Gondwanalimnadia sp. (2.1 °C) having the lowest median CTmin values, followed by L. brevirostris (3.4 °C) and S. cafer (3.6 °C). On the contrary, temperature preferences differed according to taxa, with spinicaudatans significantly preferring higher temperatures than anostracans. Leptestheria brevirostris and Gondwanalimnadia sp. both spent most time at temperatures 30–32 °C, S. cafer at 18–20 °C and B. tridens at 21–23 °C. Constrained thermal traits reported here suggest that the studied anostracans might be more susceptible to projected climatic warming than the spinicaudatans, irrespective of habitat type, however, these taxa may also compensate through phenotypic plasticity.
AB - Large branchiopods are specialist crustaceans adapted for life in temporary, thermally dynamic wetland ecosystems. Certain large branchiopod species are, however, restricted to specific temporary wetland types, exemplified by their physico-chemical and hydroperiod characteristics. Here, we contrasted the thermal preference and critical thermal maxima (CTmax) and minima (CTmin) of southern African anostracans and spinicaudatans found exclusively in either temporary rock-pool or pan wetland types. We hypothesized that environment of origin would be a good predictor of thermal preference and critical thermal limits. To test this, Branchiopodopsis tridens (Anostraca) and Leptestheria brevirostris (Spinicaudata) were collected from rock-pool habitats, while Streptocephalus cafer (Anostraca) and a Gondwanalimnadia sp. (Spinicaudata) were collected from pan habitats. In contrast to our hypothesis, taxonomic relatedness was a better predictor of CTmax and temperature preference than environment of origin. Spinicaudatans were significantly more tolerant of high temperatures than anostracans, with L. brevirostris and Gondwanalimnadia sp. median CTmax values of 45.1 °C and 44.1 °C, respectively, followed by S. cafer (42.8 °C) and B. tridens (41.4 °C). Neither environment or taxonomic relatedness were good predictors of CTmin trends, with B. tridens (0.9 °C) and Gondwanalimnadia sp. (2.1 °C) having the lowest median CTmin values, followed by L. brevirostris (3.4 °C) and S. cafer (3.6 °C). On the contrary, temperature preferences differed according to taxa, with spinicaudatans significantly preferring higher temperatures than anostracans. Leptestheria brevirostris and Gondwanalimnadia sp. both spent most time at temperatures 30–32 °C, S. cafer at 18–20 °C and B. tridens at 21–23 °C. Constrained thermal traits reported here suggest that the studied anostracans might be more susceptible to projected climatic warming than the spinicaudatans, irrespective of habitat type, however, these taxa may also compensate through phenotypic plasticity.
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U2 - 10.1016/j.jtherbio.2021.102997
DO - 10.1016/j.jtherbio.2021.102997
M3 - Article
AN - SCOPUS:85106376036
SN - 0306-4565
VL - 99
JO - Journal of Thermal Biology
JF - Journal of Thermal Biology
M1 - 102997
ER -