Results 121 to 130 of about 540 (163)

Ribosomal genes in notothenioid fishes: Focus on the chromosomal organisation

Marine Genomics, 2009
This mini-review makes a survey and a summary of some major issues concerning the chromosomal organisation of ribosomal genes in fish genomes, by using Notothenioidei as the model. The increasing body of information, published during the last two decades on the chromosomal mapping of the two ribosomal genes classes (45S rDNA and 5S rDNA) in ...
PISANO, EVA, GHIGLIOTTI, LAURA
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Karyotypes of basal lineages in notothenioid fishes: the genus Bovichtus

Polar Biology, 2006
Using comparative cytogenetic techniques, we characterized the chromosomes of fishes from the family Bovichtidae, the basal lineage of the largely Antarctic suborder Notothenioidei. We focused on three Sub-Antarctic species of the genus Bovichtus that differ greatly in their circumpolar distributions: B.
Laura Ghigliotti, Catherine Ozouf-Costaz, Eva Pisano   +2 more
exaly   +4 more sources

Bathymetric distributions of notothenioid fishes

Polar Biology, 2017
There has been no comprehensive study of the bathymetry of notothenioid fishes. Therefore, I analyzed minimum and maximum depths and depth ranges for 128 of 142 species that collectively range from 0 to ≈3000 m. Means (and medians) for maximum depths are 176 m (75 m) for non-Antarctic, 511 m (360 m) for sub-Antarctic, and 963 m (899 m) for Antarctic ...
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The hemoglobin system of Antarctic and non-Antarctic notothenioid fishes

Comparative Biochemistry and Physiology Part A: Physiology, 1997
Studies of the hemoglobin system of fish of the suborder Notothenioidei have been extended to non-Antarctic species of Pseudaphritis urvillii and Notothenia angustata. The two species belong to families that were the first to diverge within the suborder.
D'Avino R, Di Prisco G
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Cardiovascular control in Antarctic notothenioid fishes

Comparative Biochemistry and Physiology Part A: Physiology, 1997
Abstract The temperatures in the polar oceans are not only low, but also relatively stable. Blood becomes more viscous at cold temperatures and it is assumed that this increase of viscosity is responsible for a number of adaptations of the cardiovascular system.
William Davison, Michael Axelsson, Stefan Nilsson, Malcolm E. Forster   +3 more
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Heat hardening in Antarctic notothenioid fishes

Polar Biology, 2012
Many ectotherms rapidly acquire a short-lived increase in heat tolerance following a heat shock. This capacity to heat harden has been noted in a number of temperate fishes, but it is unknown whether it can also be found among the stenothermal Antarctic notothenioid fishes.
Kevin T. Bilyk, Clive W. Evans, Arthur L. DeVries   +2 more
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Extraordinary creatures: notothenioids and icefish

Journal of Experimental Biology
Notothenioids 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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Adaptive Radiation in Antarctic Notothenioids

2018
Antarctic notothenioids have undergone adaptive radiation in order to survive. Some challenges notothenioids face includes maintaining proper organ function, increased blood viscosity, maintaining appropriate protein levels, and conserving energy. Many of the solutions that the Notothenioidei have evolved to these challenges are considered to be â ...
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Ecology of Notothenioid Fish in the Weddell Sea

1991
Low water temperature, and the seasonality and scarcity of food are key factors in the life of polar ectotherms (Clarke 1983). Life in cold water requires special adaptations against freezing in teleost fish (DeVries 1971), and the need to accumulate energy reserves during summer may govern the seasonal activity pattern.
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Review of the Early Life History of Antarctic Notothenioid Fish

1991
The Antarctic cooled rapidly about 38 million years ago, when significant amounts of sea ice began to form. It became isolated in the last 30–14 million years when the Drake Passage opened to form a circum-Antarctic Ocean, and has generally cooled since then (Kennett 1977).
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