NDLI: Molecular evolution of haemoglobins of polar fishes

Content Provider	Springer Nature Link
Author	Verde, Cinzia Giorda, Daniela Prisco, Guido
Copyright Year	2006
Abstract	The Arctic and the Antarctic differ by age and isolation of the respective marine faunas. Antarctic fish are highly stenothermal, in response to stable water temperatures, whereas the Arctic ones are exposed to seasonal and latitudinal temperature variations. The knowledge of the mechanisms of phenotypic response to cold exposure in species of both polar habitats offers fundamental insights into the nature of environmental adaptation. In the process of cold adaptation, the evolutionary trend of Antarctic fish has led to unique specialisations, including modification of haematological characteristics, e.g. decreased amounts and multiplicity of haemoglobins.Unlike Antarctic Notothenioidei, Arctic teleosts have high haemoglobin multiplicity. Although the presence of functionally and structurally distinct haemoglobins is a plesiomorphic condition for many perciform-like fishes, it seems that the oxygen-transport system of teleost fish in the Arctic region has been adjusted to temperature differences and fluctuations of Arctic waters, much larger than in the Antarctic. The amino-acid sequences used to gain insight into the evolution history of α and β globins of polar fish have clearly shown that Antarctic and Arctic globins have different phylogenies, leading to the hypothesis that the selective pressure of environment stability allows the phylogenetic signal to be maintained in the Antarctic sequences, whereas environmental variability would tend to disrupt this signal in Arctic sequences.
Starting Page	297
Ending Page	308
Page Count	12
File Format	PDF
ISSN	15691705
Journal	Reviews in Environmental Science and Biotechnology
Volume Number	5
Issue Number	2-3
e-ISSN	15729826
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-08-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Antarctic Arctic Evolution Fish Globin gene Haemoglobin
Content Type	Text
Resource Type	Article
Subject	Waste Management and Disposal Pollution Environmental Engineering Applied Microbiology and Biotechnology

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