期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 218, 期 19, 页码 2987-2990出版社
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/jeb.123133
关键词
P-CO2; Chemoreceptor; Phenotypic plasticity
类别
资金
- Natural Sciences and Engineering Research Council of Canada [120513, 342303]
Aquatic hypercapnia may have helped to drive ancestral vertebrate invasion of land. We tested the hypothesis that amphibious fishes sense and respond to elevated aquatic P-CO2 by behavioural avoidance mechanisms, and by morphological changes at the chemoreceptor level. Mangrove rivulus (Kryptolebias marmoratus) were exposed to 1 week of normocapnic control water (pH8), air, hypercapnia (5% CO2, pH 6.8) or isocapnic acidosis (pH 6.8). We found that the density of CO2/H+ chemoreceptive neuroepithelial cells (NECs) was increased in hypercapnia or isocapnic acidosis-exposed fish. Projection area (a measure of cell size) was unchanged. Acute exposure to progressive hypercapnia induced the fish to emerse (leave water) at water pH values similar to 6.1, whereas addition of HCl to water caused a more variable response with a lower pH threshold (similar to pH 5.5). These results support our hypothesis and suggest that aquatic hypercapnia provides an adequate stimulus for extant amphibious fishes to temporarily transition from aquatic to terrestrial habitats.
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