BSC 385 Lecture Notes - Lecture 11: Genetic Drift, Natural Selection, Deme
16 Feb 2017
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Document Summary
Quantitative description of the structure of populations. Life tables and fecundity schedules are major tools used by demographers to quantify. Includes size, age structure, sex ratios and growth rate (i. e. , vital statistics) age-specific patterns. Environments affects the way populations change and grow. Populations can reach mind-boggling sizes: in 2004, a swarm of locusts 3,7 miles long was recorded in australia, in 1954, a series of 50 locust swarms invaded kenya at the total number of 5 x. Demography studies how populations grow and change. When environmental conditions become unfavorable, solitary insects change to highly gregarious form: hormonal change, morphological change (color, behavioral change (aggregation and migration) The historical record of locust plagues in china (lima, 2007) Locust outbreaks are more common during decades characterized by cold, wet weather. Flooding during such decades leads to an increase in suitable locust habitat. Within such decade, outbreaks occur in the warmest year, when the rate of locust development and survival are highest.
