BIOL 2P05 Lecture Notes - Lecture 28: American Yellow Warbler, Red Knot, Habitat Fragmentation
2 Apr 2018
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Document Summary
Shorebird populations have shrunk by 70% since 1973. Birds reproduce in the arctic, which are experiencing the most rapid warming - represents environmental pressure. Warming in arctic makes them less fit in wintering grounds. Genome analysis reveals loci associated with ability to adapt to climate change. Matched genomes of different yellow warbler populations to climactic variables. High genomic vulnerability or mismatch between allelic variation and environmental conditions was correlated with a higher likelihood of population decline. Human pressures also cause sever decreases in number, size and genetic variability of populations. Senstive to both aquatic and terrestrial environmental effects. Sharp increase in levels of extinction since industrialization. Rates of extinction are slightly different for each species. Two-staged life cycle of both aquatic and terrestrial phases. Become more susceptible to toxins and uv radiation. 87% reduction in wetland areas since the start of modern era.
