BIOL 1070 Study Guide - Final Guide: Paraphyly, Vasodilation, Ground Squirrel
21 Apr 2016
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Document Summary
Arctic fox remain active even when arctic temperatures fall to -50c. Several strategies for surviving this climate are listed below. Classifying animals in terms of response to environment. Current climate change has raised concerns over the fate of the stenothermal antarctic marine fauna (animals that evolved to live in narrow ranges of cold temperatures). The present paper focuses on notothenioidei, a taxonomic group that dominates antarctic fish. Notothenioids evolved in the southern ocean over the last 20 million years, providing an example of a marine species flock with unique adaptations to the cold at morphological, physiological and biochemical levels. Their phenotypic modifications are often accompanied by irreversible" genomic losses or gene amplifications. On a microevolutionary scale, relatively shallow" genetic variation is observed, on account of past fluctuations in population size, and a significant genetic structure is evident, suggesting low population connectivity. Antarctic fish might have relatively little potential to adapt to global warming, at least at a genetic level.
