Test 3 Material

Test 3 Material - Test 3 Material Life History-...

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Test 3 Material Life History- adaptations/characteristics of organisms that influence reproduction probability of dying increases with age reproduction increases probability of dying resources are limiting, trade offs with # and size of offspring Reproductive strategies -age specific early late adv: reproduce before death more energy stored harsh, unpredictable env simple, predictable env dis: less energy greater chance of dying Catagamovs- eels, fresh --> seawater, lay eggs and die semelparity- reproduce only once in life iteroparity- more than once in life sem- harsh environment, bet on survival, lots of small offspring, anadramous fish itero- benign, predictable environment, bet on survival of parents, few large offspring sexual selection- differences in reproduction from mating success due to intra or intersexual selection intra- competing within a sex inter- opposite sex chooses mate negative tradeoffs- color attracts predators Social behavior- groups living together, cooperating inclusive fitness = individual fitness + fitness of closely related individuals (raising young) kin selection- adaptations that enable individuals to increase their inclusive fitness by helping increase survival of genetic relatives that are not offspring- ants and bees, only explanation for altruistic behavior R and K species- K always opposite r- high rate of increase, not highly favored competitively, rapid development, early reproduction, small body, semelparity, many offspring, variable population, large clutch size, better at colonizing, harsh environment Generalizations- As many variations in life history as species success of a life history depends on the environment being the same differences in life history are a function of environment, including interspecies interactions differences in life history contribute to diversity within ecological communities Population regulation- Myrica Cerifera Actinorisal- Fixes Nitrogen Microrisal- symbiosis between plants and fungi Population interactions any time 2 species overlap in resource use Mutualism- both species benefit, symbiosis includes physical integration Predation Commensalism- Spanish moss or barnacles on a whale Competition Amensalism- one negatively affected, hard to demonstrate
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This note was uploaded on 04/09/2008 for the course BIOL 317 taught by Professor Crawford during the Spring '07 term at VCU.

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Test 3 Material - Test 3 Material Life History-...

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