期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 223, 期 4, 页码 -出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jeb.209692
关键词
Hypoxia resistance; Evolutionary physiology; Phylogenetically independent contrasts; Respirometry; Diurnal hypoxia
类别
资金
- McMaster University
- Canadian Foundation for Innovation
- Ontario Ministry of Research and Innovation
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- National Science Foundation
- National Institutes of Environmental Health Sciences [R01 ES021934-01]
- Ontario Graduate Scholarship
- National Institutes of Environmental Health Sciences postgraduate scholarship
- Society for Experimental Biology
- Louisiana State University President's Future Leaders in Research scholarship
- American Physiological Society undergraduate research fellowship
- Louisiana Sea Grant Award
- Explorer Club
- Louisiana State University Discover
- Louisiana State University Office of Research
- Canada Research Chairs program
Hypoxia is a pervasive stressor in aquatic environments, and both phenotypic plasticity and evolutionary adaptation could shape the ability to cope with hypoxia. We investigated evolved variation in hypoxia tolerance and the hypoxia acclimation response across fundulid killifishes that naturally experience different patterns of hypoxia exposure. We compared resting O-2 consumption rate ((M)over dot(O2)), and various indices of hypoxia tolerance [critical O-2 tension (P-crit), regulation index (RI), O-2 tension (PO2) at loss of equilibrium (P-LOE) and time to LOE (t(LOE)) at 0.6 kPa O-2] in Fundulus confluentus, Fundulus diaphanus, Fundulus heteroclitus, Fundulus rathbuni, Lucania goodei and Lucania parva. We examined the effects of chronic (28 days) exposure to constant hypoxia (2 kPa) or nocturnal intermittent hypoxia (12 h normoxia:12 h hypoxia) in a subset of species. Some species exhibited a two-breakpoint model in (M)over dot(O2) caused by early, modest declines in (M)over dot(O2) in moderate hypoxia. We found that hypoxia tolerance varied appreciably across species: F. confluentus was the most tolerant (lowest P-LOE and P-crit, longest t(LOE)), whereas F. rathbuni and F. diaphanus were the least tolerant. However, there was not a consistent pattern of interspecific variation for different indices of hypoxia tolerance, with or without taking phylogenetic relatedness into account, probably because these different indices are underlain by partially distinct mechanisms. Hypoxia acclimation generally improved hypoxia tolerance, but the magnitude of plasticity and responsiveness to different hypoxia patterns varied interspecifically. Our results therefore suggest that hypoxia tolerance is a complex trait that is best appreciated by considering multiple indices of tolerance.
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