| Autor: |
Barrett NJ; British Antarctic Survey, Natural Environment Research Council , Cambridge CB3 0ET, UK.; Department of Earth Sciences, University of Cambridge , Cambridge CB2 3EQ, UK., Harper EM; British Antarctic Survey, Natural Environment Research Council , Cambridge CB3 0ET, UK.; Department of Earth Sciences, University of Cambridge , Cambridge CB2 3EQ, UK., Peck LS; British Antarctic Survey, Natural Environment Research Council , Cambridge CB3 0ET, UK. |
| Jazyk: |
angličtina |
| Zdroj: |
Proceedings. Biological sciences [Proc Biol Sci] 2024 Sep; Vol. 291 (2031), pp. 20241038. Date of Electronic Publication: 2024 Sep 18. |
| DOI: |
10.1098/rspb.2024.1038 |
| Abstrakt: |
Climate change is causing increased coastal freshening in Antarctica, leading to reduced salinity. For Antarctica's endemic echinoderms, adapted to the stable polar environment, the impact of rapid reductions in coastal salinity on physiology and behaviour is currently unknown. Six common Antarctic echinoderms (the sea urchin Sterechinus neumayeri ; the sea star Odontaster validus ; the brittle star Ophionotus victoriae ; and three sea cucumbers Cucumaria georgiana , Echinopsolus charcoti and Heterocucumis steineni ), were directly transferred from ambient salinity (34.5‰) to a range of salinity dilutions (29-9‰) for 24 h. All species showed reduced activity and the establishment of a temporary osmotic gradient between coelomic fluid and external seawater. Most species exhibited a depression in oxygen consumption across tolerated salinities; however, at very low salinities that later resulted in mortality, oxygen consumption increased to levels comparable to those at ambient. Low salinity tolerance varied substantially between species, with O. victoriae being the least tolerant (24 h LC 50 (lethal for 50% of animals) = 19.9‰) while E. charcoti and C. georgiana demonstrated the greatest tolerance (24 h LC 50 = 11.5‰). These findings demonstrate the species-specific response of Antarctica's endemic echinoderms to short-term hypoosmotic salinity events, providing valuable insight into this phylum's ability to respond to an underreported impact of climate change. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
