Branchial morphology and ion-water transport proteins in Antarctic teleosts with different modes of life
In the Antarctic Ocean salt concentration diVers from the bottom to the surface owing to the seasonal form- ing and melting of sea ice. Antarctic teleosts present diVer- ent lifestyle from benthic to pelagic. While benthic animals face a constant seawater salinity, benthic–pelagic animals have to fa...
| Published in: | Polar Biology |
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| Main Authors: | , , , |
| Other Authors: | , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
2007
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| Subjects: | |
| Online Access: | http://hdl.handle.net/11579/90661 https://doi.org/10.1007/s00300-007-0329-4 |
| Summary: | In the Antarctic Ocean salt concentration diVers from the bottom to the surface owing to the seasonal form- ing and melting of sea ice. Antarctic teleosts present diVer- ent lifestyle from benthic to pelagic. While benthic animals face a constant seawater salinity, benthic–pelagic animals have to face diVerent salt concentration. Branchial mor- phology and ion–water transport proteins were compared in animals with diVerent lifestyle. The ultrastructure of the gills was investigated by scanning electron microscopy (SEM). Na+/K+/A TPase, Na+/K+/Cl¡ cotransport protein NKCC1 and Aquaporin 3 (AQP3), were investigated by immunohistochemistry. The immunoreactivity for the ion transporter proteins were more intense in the active ben- thic–pelagic animals and in the iceWshes than in the slug- gish benthic ones. Conversely, AQP immunoreactivity was stronger in the animals with sedentary lifestyles. The SEM showed the secondary lamellae in the benthic–pelagic ani- mals more densely packed with the exception of the haemo- globin free teleosts. |
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