BS 110 Notes 11-22-2010 and 11-24-2010

BS 110 Notes - space and time • Branch of ecology that studies the activities of populations 1 Density – number of individuals per square area

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
BS 110 Notes 11-22-2010 and 11-24-2010 Ecological Pyramid – pyramid representations that demonstrate the changes that take place in the numbers of individuals, biomass/weight of individuals and in energy when moving from the producers to the consumer trophic levels Food Web – occurs when two or more trophic levels obtain energy from and provide energy to 2 or more trophic levels, resulting in a complex set of energy transfers Detritus = dead organic matter Detritovores/Decomposers can be divided into a food chain/web based on feeding relationships Primary detritovores obtain energy from detritus/dead organisms, while secondary detritivores obtain energy from dead primary detritovores In a certain community, mice eat seeds and grass; mice are eaten by snakes who are eaten by owls. Mice also are eaten by fox who eat rabbits. With this information answer trophic levels, consumers, etc. draw food web. Ecology Levels of hierarchy/organization that can be studied Population Ecology – group of interbreeding individuals of the same species, localized in
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: space and time • Branch of ecology that studies the activities of populations 1. Density – number of individuals per square area o Depends on distance pattern shown by species • Estimate population numbers – count individuals in representative areas and extrapolate • N = AB/C o N =estimation in a population o A=# of individuals caught the first time, marked, and released o B=# of individuals caught the 2 nd time, both marked, unmarked individuals o C=# of marked recaptures 2. Movements a. Emigration – leaves habitat b. Immigration – enters habitat c. Migration – leaves population A, returns population A 3. Population growth and numbers a. Biotic potential b. Carrying capacity c. Environment resistance d. Max rate of population growth which would result if all females bred as often as possible and all individuals survived beyond reproductive age under ideal conditions...
View Full Document

This note was uploaded on 01/31/2011 for the course BS 110 taught by Professor S.lawrence during the Fall '07 term at Michigan State University.

Page1 / 2

BS 110 Notes - space and time • Branch of ecology that studies the activities of populations 1 Density – number of individuals per square area

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online