Key Words and Concepts for ENVS 24 Midterm 2

Key Words and Concepts for ENVS 24 Midterm 2 - ENVS 24...

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ENVS 24 General Ecology: review for midterm #2 08:20 Key Words and Concepts for ENVS 24 Midterm 2: Critical Daylength : the period of daylight, specific for any given species, that triggers a long day or a short day response in organisms Genet:a genetic individual plant arises from a single fertilized egg (zygote) Gamet: an individual produced asexually from the genet Distribution: arrangement of organisms with in an area Abundance: the number of individuals of a species in a given area ( population size) Habitat: place where an animal or plant lives Generalist: can live in a broad area Specialist: very specific requirement for habitat ex. Pitcher plant Population Density: # of individuals in a population per unit area Ecological Density: density measured in terms of the # of individuals per usable living space Dispersal: leaving an area of birth or activity for another area Uniform- desert shrubs in Sonora random plankton distribution is random on a small scale. ..large scale distribution is clumped clumped (most abundant in nature) Emigration: movement out of an area Immigration: arrival of new individuals into a habitat or population Migration: mass movement
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intentional directional often seasonal NOT always a round trip Triggered by environmental stimulus Metapopulations: a population broken into sets of subpopulations held together by dispersal or movements of individuals among them 1) Suitable habitat occurs in discrete patches that may be occupied by local breeding populations 2) Even the largest populations vulnerable to extinction 3) Habitats not so isolated as to prevent recolonization after local extinction 4) Dynamics of local populations are not well synchronized Mark and Recapture Method/Lincoln Petersen Index: N/M – n/R N: population estimate N: total # of individuals captured in the census period M: # marked in the precensus period R: # of marked individuals in the census period Assumptions: Equal chance of capture for all Ratio of marked to unmarked constant over time
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marked Individuals distribute themselves at random in population after release marks are not lost no mortality or reproduction b/w precensus and census periods mark- recapture of Coho salmon Invasive Species:a nonnative species that successfully colonizes a disturbed area or empty niche, spreads, and outcompetes associated native species Invasion ecology: environmental concerns: threats to biodiversity and ecosystem integrity second greatest cause of extinctions economic affects ethical issues… ecological insight: Large scale “natural experiments” invasive species: a problematic species that in not native to an ecosystem, generally with an expanding range. Stages of invasion:
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This test prep was uploaded on 04/21/2008 for the course ENVS 24 taught by Professor Washburn during the Fall '07 term at University of California, Santa Cruz.

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Key Words and Concepts for ENVS 24 Midterm 2 - ENVS 24...

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