Biology 2483A Lecture 22: Bio 2483 Lecture 22
14 Jan 2019
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Document Summary
For emotional health, most of us require time spent surrounded by nature"s beauty and complexity. Extinction rates estimated from the fossil record are used as background rates. For mammals and birds, the background rate is one species every 200 years. in order to identify species, we need a good description of them first. Changes in the threat status of species (e. g. , shift from endangered to critically endangered) look at group of species and what direction theyre moving in: rates of population decline or range contraction of common species. The number of non-native species that have become established in the. United states has increased about fivefold over the past century for various organisms: b) overexploitation, pollution, an emerging pollution threat is endocrine-disrupting contaminants (edcs), edcs interfere with reproduction, neurological development, and immune function in mammals. They include flame-retardants (pbdes) that act as edcs.
