1.A population is a group of organisms of the same species which occupies a given area. 2.Organisms do not live solitary lives in isolation from other members of their species 3.Organisms are composed of cells but not simply put cells together(Cells in different tissues have different functions) 6
6 1. A population is a group of organisms of the same species which occupies a given area. 2. Organisms do not live solitary lives in isolation from other members of their species 3. Organisms are composed of cells but not simply put cells together (Cells in different tissues have different functions)
What geographical area to study?In a lake or woodland,some other isolated habitat The boundaries between populations can be arbitrary (人为的)·Populations may be categorized as consisting of either unitary or modular organisms. >
7 What geographical area to study? In a lake or woodland, some other isolated habitat The boundaries between populations can be arbitrary （人为的）. Populations may be categorized as consisting of either unitary or modular organisms
Population problems in our planet 种群问题
8 Population problems in our planet 种群问题
水体的富营养化 (Eutrophication or overnourishing of a waterbody) 水华(algal bloom)
9 水 华( algal bloom ) algal bloom ) 水体的富营养化 水体的富营养化 (Eutrophication Eutrophication or overnourishing overnourishing of a water body ) of a water body )
水体的富营养化 (Eutrophication or overnourishing of a water body 赤潮(red tide) 10
10 水体的富营养化 水体的富营养化 (Eutrophication Eutrophication or overnourishing overnourishing of a water body ) of a water body ) 赤潮 （red tide red tide）