BIOL 3130 Lecture Notes - Lecture 11: Covariance, Thatching, Natural Selection
27 Oct 2017
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Document Summary
Case study: australia(cid:495)s carp herpes plan dubbed (cid:494)serious risk to global food security(cid:495) Original purpose: the who used ddt to kill the mosquitoes that caused malaria. Byproduct #1: eliminated the natural predator for the thatch eating caterpillar: killed parasitic wasp, overpopulation of caterpillars, caterpillars are the roofs off the villager(cid:495)s houses outbreak of sylvatic plague. Habitat loss, fragmentation/isolation, climate change, over-exploitation (population size), species invasions. Arid deserts in southwestern us will shrink as precipitation increases. Savanna/shrub/woodland systems will replace grasslands in the great plains. Eastern us- forests will expand northerly- weather conditions will become more severe. Southeastern us- increasing droughts will bring more fires-triggering a rapid change from broadleaf forests to savannas. Its not just about warmer average temperatures across the planet. Detection: data patchy and qualitative, climate is naturally variable by season, by latitude, and by year. Attribution: covariance with other co-occuring human-based impacts on the environment, buffering: response lags.
