Results 141 to 150 of about 718 (182)
Metallothionein in Antarctic notothenioids: Genetic polymorphism and differential gene expression [PDF]
Italian Journal of Zoology, 2000 Among Antarctic notothenioids, appreciable amounts of hepatic metallothionein were found in red-blooded species, whilst very little metallothionein, if any, was detected in icefish. In contrast, high levels of metallothionein mRNA were revealed in both fishes by Northern blot analysis of total RNA.
Vincenzo Carginale +2 more
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Ocular morphology in antarctic notothenioid fishes
Journal of Morphology, 1988AbstractBeneath the sea ice at McMurdo Sound, Antarctica, notothenioid fishes are subject to extreme seasonal variation in the annual light cycle including 4 months of continual darkness. Gross and microscopic anatomy of the eyes of 18 species revealed ocular morphology that was generally similar to that of coastal fishes elsewhere in the world, and ...
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Iron metabolism genes in Antarctic notothenioids: A review
Marine Genomics, 2008Iron is an essential element for metabolic processes intrinsic to life, but the properties that make iron a necessity also make it potentially deleterious. To avoid harm, iron homeostasis is achieved through iron transport, storage and regulatory proteins. The functions of some of these molecules are well described, for example transferrin and ferritin,
SCUDIERO, ROSARIA +2 more
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In search of notothenioid (Teleostei) relatives
Antarctic Science, 2004Ninety-five percent of the fish species known from the Antarctic continental shelf and upper slope are acanthomorphs, i.e. spiny teleosteans. Notothenioids (suborder Notothenioidei) are acanthomorphs and so is their sister group. Unfortunately, until recently acanthomorph intra-relationships were so poorly known that it was necessary to sample all of ...
AGNÈS DETTAÏ, GUILLAUME LECOINTRE
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The Sensory Biology of Notothenioid Fish
1991The antarctic marine environment is notable not only for its low temperature, but also for the light levels which occur under areas of ice cover, and during the polar winter. Within the confines of this environment has evolved a unique assemblage of fish.
J. A. Macdonald, J. C. Montgomery
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Reproduction in Antarctic notothenioid fish
Antarctic Science, 1991Gonad maturation in Antarctic notothenioid fish is a biennial process although spawning is likely to take place annually. However, part of the populations of Champsocephalus gunnari in the Atlantic Ocean sector do not spawn each year. Gonadosomatic index (GSI) of females is 15–40% at spawning. Apart from a few nototheniid species of the GSI of males is
Karl-Hermann Kock, Adolf Kellermann
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Periventricular morphology in the diencephalon of antarctic notothenioid teleosts
Journal of Comparative Neurology, 1995AbstractWe have examined the subependymal region of the diencephalic third ventricle in notothenioid perciforms and report a pattern of neuropil expansions that appears to be phyletically derived for notothenioids and their outgroups but that is otherwise unique among vertebrates.
M J, Lannoo, J T, Eastman
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Total Mercury in Six Antarctic Notothenioid Fishes
Bulletin of Environmental Contamination and Toxicology, 2015We analyzed white muscle samples from six species of Antarctic fish (suborder Notothenioidei) collected in 2011 from McMurdo Sound, Ross Sea, Antarctica, to assess levels of total mercury (THg). Gymnodraco acuticeps and Trematomus bernacchii exhibited the highest concentrations of THg followed by Trematomus pennellii, Trematomus nicolai, Trematomus ...
Nathan J P, Wintle +4 more
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Extraordinary creatures: notothenioids and icefish
Journal of Experimental BiologyNotothenioids are fish capable of surviving in the sub-zero waters surrounding Antarctica. Equipped with antifreeze proteins for protection, they are benthic, living on the bottom of the sea, feeding on krill and other fish. Many are sit-and-wait predators, moving little with relatively low metabolic rates. A subgroup of the notothenioids, the icefish,
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Recent origin of sub-Antarctic notothenioids
Polar Biology, 2002Comparison of partial mitochondrial 12S and 16S rDNA sequences from non-Antarctic notothenioid fishes – an icefish Champsocephalus esox and two members of the genus Patagonotothen – and their sister species from the Southern Ocean suggests that their divergence took place 1.7 and 6.6–7 million years ago, respectively, i.e. much later than the formation
A. Stankovic +4 more
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