Gill paracellular permeability and the osmorespiratory compromise during exercise in the hypoxia-tolerant Amazonian oscar (Astronotus ocellatus)
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- 作者：Lisa M. Robertson ; Daiani Kochhann ; Adalto Bianchini…
- 关键词：Polyethylene glycol (PEG ; 4000) ; Mitochondrial ; rich cells (MRCs) ; Interlamellar cell mass (ILCM) ; Trout ; Hypoxia ; Cichlid ; Exercise ; Drinking rate ; Glomerular filtration rate
- 刊名：Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology
- 出版年：2015
- 出版时间：October 2015
- 年：2015
- 卷：185
- 期：7
- 页码：741-754
- 全文大小：1,232 KB
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Ong KJ, Stevens ED, Wright PA (2007) Gill - 作者单位：Lisa M. Robertson (1)
Daiani Kochhann (2)
Adalto Bianchini (3)
Victoria Matey (4)
Vera F. Almeida-Val (2)
Adalberto Luis Val (2)
Chris M. Wood (1) (5) (6)
1. Department of Biology, McMaster University, Hamilton, ON, L8S 4K1, Canada
2. Laboratory of Ecophysiology and Molecular Evolution, Instituto Nacional de Pesquisas da Amaz?nia (INPA), Manaus, AM, Brazil
3. Universidade Federal do Rio Grande (FURG), Rio Grande, RS, Brazil
4. Department of Biology, San Diego State University, San Diego, CA, 92182, USA
5. Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, 33149, USA
6. Department of Zoology, University of British Columbia, 4200 University Boulevard, Vancouver, BC, V6T 1Z4, Canada - 刊物类别：Biomedical and Life Sciences
- 刊物主题：Life Sciences
Biochemistry
Biomedicine
Human Physiology
Zoology
Animal Physiology - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-136X
文摘
In the traditional osmorespiratory compromise, fish increase their effective gill permeability to O2 during exercise or hypoxia, and in consequence suffer unfavorable ionic and osmotic fluxes. However oscars, which live in the frequently hypoxic ion-poor waters of the Amazon, actually decrease ionic fluxes across the gills during acute hypoxia without changing gill paracellular permeability, and exhibit rapid paving over of the mitochondrial-rich cells (MRCs). But what happens during prolonged exercise? Gill paracellular permeability, ionic fluxes, and gill morphology were examined in juvenile oscars at rest and during aerobic swimming. Initial validation tests with urinary catheterized fish quantified drinking, glomerular filtration, and urinary flow rates, and confirmed that measurements of gill paracellular permeability as [3H]PEG-4000 clearances were the same in efflux and influx directions, but far lower than previously measured in comparably sized trout. Although the oscars achieved a very similar proportional increase (90 %) in oxygen consumption (MO2) to trout during steady-state swimming at 1.2 body lengths sec?, there was no increase in gill paracellular permeability, in contrast to trout. However, oscars did exhibit increased unidirectional Na+ efflux and net K+ rates during exercise, but no change in drinking rate. There were no changes in MRC numbers or exposure, or other alterations in gill morphology during exercise. A substantial interlamellar cell mass (ILCM) that covered the lamellae to a depth of 30 % was unchanged by 4 h of swimming activity. We conclude that a low branchial paracellular permeability which can be dissociated from changes in O2 flux, as well as the presence of the ILCM, may be adaptive in limiting ionoregulatory costs for a species endemic to ion-poor, frequently hypoxic waters. Keywords Polyethylene glycol (PEG-4000) Mitochondrial-rich cells (MRCs) Interlamellar cell mass (ILCM) Trout Hypoxia Cichlid Exercise Drinking rate Glomerular filtration rate