{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T13:01:30Z","timestamp":1778677290759,"version":"3.51.4"},"reference-count":75,"publisher":"The Company of Biologists","issue":"2","license":[{"start":{"date-parts":[[2024,2,5]],"date-time":"2024-02-05T00:00:00Z","timestamp":1707091200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"name":"Elsa-Neumann-Scholarship"},{"DOI":"10.13039\/501100001659","name":"German Research Foundation","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Humboldt University of Berlin: Humboldt-Universitat zu Berlin"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,2,15]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n               <jats:p>The thermal ecology of ectotherm animals has gained considerable attention in the face of human-induced climate change. Particularly in aquatic species, the experimental assessment of critical thermal limits (CTmin and CTmax) may help to predict possible effects of global warming on habitat suitability and ultimately species survival. Here we present data on the thermal limits of two endemic and endangered extremophile fish species, inhabiting a geothermally heated and sulfur-rich spring system in southern Mexico: The sulfur molly (Poecilia sulphuraria) and the widemouth gambusia (Gambusia eurystoma). Besides physiological challenges induced by toxic hydrogen sulfide and related severe hypoxia during the day, water temperatures have been previously reported to exceed those of nearby clearwater streams. We now present temperature data for various locations and years in the sulfur spring complex and conducted laboratory thermal tolerance tests (CTmin and CTmax) both under normoxic and severe hypoxic conditions in both species. Average CTmax limits did not differ between species when dissolved oxygen was present. However, critical temperature (CTmax=43.2\u00b0C) in P. sulphuraria did not change when tested under hypoxic conditions, while G. eurystoma on average had a lower CTmax when oxygen was absent. Based on this data we calculated both species' thermal safety margins and used a TDT (thermal death time) model framework to relate our experimental data to observed temperatures in the natural habitat. Our findings suggest that both species live near their thermal limits during the annual dry season and are locally already exposed to temperatures above their critical thermal limits. We discuss these findings in the light of possible physiological adaptions of the sulfur-adapted fish species and the anthropogenic threats for this unique system.<\/jats:p>","DOI":"10.1242\/bio.060223","type":"journal-article","created":{"date-parts":[[2024,2,5]],"date-time":"2024-02-05T10:38:18Z","timestamp":1707129498000},"source":"Crossref","is-referenced-by-count":6,"title":["Thermal tolerance in an extremophile fish from Mexico is not affected by environmental hypoxia"],"prefix":"10.1242","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7386-3259","authenticated-orcid":false,"given":"Korbinian","family":"Pacher","sequence":"first","affiliation":[{"name":"Leibniz-Institute of Freshwater Ecology and Inland Fisheries 1 Department of Biology and Ecology of Fishes , , 12487 Berlin , Germany"},{"name":"Albrecht Daniel Thaer-Institute, Humboldt University of Berlin 2 Faculty of Life Sciences , , 10115 Berlin , Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Natalia","family":"Hern\u00e1ndez-Rom\u00e1n","sequence":"additional","affiliation":[{"name":"Universidad Ju\u00e1rez Aut\u00f3noma Tabasco 3 Divisi\u00f3n Acad\u00e9mica de Ciencias Biol\u00f3gicas , , 86150 Villahermosa , Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alejandro","family":"Juarez-Lopez","sequence":"additional","affiliation":[{"name":"Universidad Ju\u00e1rez Aut\u00f3noma Tabasco 3 Divisi\u00f3n Acad\u00e9mica de Ciencias Biol\u00f3gicas , , 86150 Villahermosa , Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-3557-1185","authenticated-orcid":false,"given":"Jes\u00fas Emmanuel","family":"Jim\u00e9nez-Jim\u00e9nez","sequence":"additional","affiliation":[{"name":"Universidad Ju\u00e1rez Aut\u00f3noma Tabasco 3 Divisi\u00f3n Acad\u00e9mica de Ciencias Biol\u00f3gicas , , 86150 Villahermosa , Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3336-847X","authenticated-orcid":false,"given":"Juliane","family":"Lukas","sequence":"additional","affiliation":[{"name":"Leibniz-Institute of Freshwater Ecology and Inland Fisheries 1 Department of Biology and Ecology of Fishes , , 12487 Berlin , Germany"},{"name":"Albrecht Daniel Thaer-Institute, Humboldt University of Berlin 2 Faculty of Life Sciences , , 10115 Berlin , Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3858-0904","authenticated-orcid":false,"given":"Yunus","family":"Sevinchan","sequence":"additional","affiliation":[{"name":"Excellence Cluster Science of Intelligence, Technische Universit\u00e4t Berlin 4 Science of intelligence cluster has the state of a department at TU Berlin , , 10587 Berlin , Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jens","family":"Krause","sequence":"additional","affiliation":[{"name":"Leibniz-Institute of Freshwater Ecology and Inland Fisheries 1 Department of Biology and Ecology of Fishes , , 12487 Berlin , Germany"},{"name":"Albrecht Daniel Thaer-Institute, Humboldt University of Berlin 2 Faculty of Life Sciences , , 10115 Berlin , Germany"},{"name":"Excellence Cluster Science of Intelligence, Technische Universit\u00e4t Berlin 4 Science of intelligence cluster has the state of a department at TU Berlin , , 10587 Berlin , Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lenin","family":"Arias-Rodr\u00edguez","sequence":"additional","affiliation":[{"name":"Universidad Ju\u00e1rez Aut\u00f3noma Tabasco 3 Divisi\u00f3n Acad\u00e9mica de Ciencias Biol\u00f3gicas , , 86150 Villahermosa , Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7049-2299","authenticated-orcid":false,"given":"David","family":"Bierbach","sequence":"additional","affiliation":[{"name":"Leibniz-Institute of Freshwater Ecology and Inland Fisheries 1 Department of Biology and Ecology of Fishes , , 12487 Berlin , Germany"},{"name":"Albrecht Daniel Thaer-Institute, Humboldt University of Berlin 2 Faculty of Life Sciences , , 10115 Berlin , Germany"},{"name":"Excellence Cluster Science of Intelligence, Technische Universit\u00e4t Berlin 4 Science of intelligence cluster has the state of a department at TU Berlin , , 10587 Berlin , Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"237","published-online":{"date-parts":[[2024,2,5]]},"reference":[{"key":"2024020510380881900_BIO060223C1","doi-asserted-by":"publisher","first-page":"e2207052119","DOI":"10.1073\/pnas.2207052119","article-title":"Brain dysfunction during warming is linked to oxygen limitation in larval zebrafish","volume":"119","author":"Andreassen","year":"2022","journal-title":"Proc. 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