Volume 4 • 2016 10.1093/conphys/cow047 Research article Endocrine and metabolic impacts of warming ff aquatic habitats: di erential responses between Downloaded from https://academic.oup.com/conphys/article-abstract/4/1/cow047/2951922 by guest on 24 February 2020 recently isolated populations of a eurythermal desert pupfish Sean C. Lema1,*, Michelle I. Chow1,†, Emily J. Resner1, Alex A. Westman1, Darran May2, Andrew H. Dittman3 and Kristin M. Hardy1 1Biological Sciences Department, Center for Coastal Marine Sciences, California Polytechnic State University, San Luis Obispo, CA 93407, USA 2School of Aquatic and Fishery Sciences, University of Washington, Seattle, WA 98105, USA 3Environmental and Fisheries Sciences Division, Northwest Fisheries Science Center, National Marine Fisheries Service, NOAA, Seattle, WA 98112, USA *Corresponding author: Biological Sciences Department, Center for Coastal Marine Sciences, California Polytechnic State University, San Luis Obispo, CA 93407, USA. Tel: +1 805 756 2802. E-mail:
[email protected] .............................................................................................................................................................. Temperatures of inland aquatic habitats are increasing with climate change, and understanding how fishes respond physio- logically to thermal stress will be crucial for identifying species most susceptible to these changes. Desert fishes may be particularly vulnerable to rising temperatures because many species occupy only a fraction of their historical range and occur in habitats with already high temperatures. Here, we examined endocrine and metabolic responses to elevated tem- perature in Amargosa pupfish, Cyprinodon nevadensis amargosae. We studied C. n. amargosae from two habitats with dis- tinct thermal conditions: the Amargosa River, which experiences diurnally and seasonally variable temperatures (0.2–40°C); and Tecopa Bore, a spring and marsh fed by hot groundwater (47.5°C) from an artesian borehole.