Journal
JOURNAL OF FISH BIOLOGY
Volume 74, Issue 6, Pages 1245-1258Publisher
WILEY
DOI: 10.1111/j.1095-8649.2009.02192.x
Keywords
aquatic surface respiration; Cichlidae; dissolved oxygen; ecophysiology; non-indigenous
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Funding
- South Florida Water Management District, U.S. Geological Survey
- U.S. Fish and Wildlife Service
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This study quantified the hypoxia tolerance of the Mayan cichlid Cichlasoma urophthalmus over a range of salinities. The species was very tolerant of hypoxia, using aquatic surface respiration (ASR) and buccal bubble holding when oxygen tensions dropped to < 20 mmHg (c. 1.0 mg l(-1)) and 6 mmHg, respectively. Salinity had little effect on the hypoxia tolerance of C. urophthalmus, except that bubble holding was more frequent at the higher salinities tested. Levels of aggression were greatest at the highest salinity. The ASR thresholds of C. urophthalmus were similar to native centrarchid sunfishes from the Everglades, however, aggression levels for C. uropthalmus were markedly higher.
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