MOLECULAR PHYLOGENYOF HEMOGLOBIN*□S

• Main Authors: Boreal Fish, Family Gadidae
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Antarctic; Arctic; Antarc*; Arctic cod; Arctogadus glacialis; atlantic cod; Boreogadus saida; Gadus morhua; polar cod
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.573.293; http://glecointre.mnhn.fr/docs/065_Verde_et_al2006aJBC.pdf

The Arctic and Antarctic marine faunas differ by age and isolation. Fishes of the two polar regions have undergone dif-ferent regional histories that have driven the physiological diversities. Antarctic fish are highly stenothermal, in keeping with stable water temperatures, whereas Arctic fish, being exposed to seasonal temperature variations, exhibit higher physiological plasticity. This study reports the characteriza-tion of the oxygen transport systemof threeArctic species of the family Gadidae, namely the Arctic cod Arctogadus glacialis, the polar cod Boreogadus saida, and the Atlantic cod Gadus morhua. Unlike Antarctic notothenioids, the blood displays high multiplicity, i.e. it has three hemoglobins, similar to many other acanthomorph teleosts. In the most abundant hemoglo-bin, oxygen binding ismodulated by heterotropic effectors, with marked Bohr and Root effects. Remarkably, in two species