BIOL 4253 Test 2 Experiments

BIOL 4253 Test 2 Experiments - Life History Trade Off in...

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Life History Trade Off in Humans: (Penn and Smith 2009) More children = less survivorship. There was also less survivorship with less time in between births. Females were most affected; short drop in survivorship after first child. _____________________________________________________________________________________ Intraspecific Competition – Self Thinning in Trees (Luvssaert 2008) Density drops as tree growth increases in a population As tree number increases, trees self thin and grow tall and spindly Intraspecific Competition – Planthoppers (Denno and Roderick 1992) Higher density lowered survivorship, as well as fitness. ____________________________________________________________________________________ COMPETITIVE EXCLUSION – Interspecific Competition 1. Species using the same limiting resource cannot coexist. 2. One will competitively exclude the other. Interspecific Competition – Tansley’s Bedstraw (Tansley 1917) Both species grew equally well in any soil (abiotic factors not limiting) When place together, species who was native in that particular soil out-competed the other bedstraw species. ***outcomes depend on environment*** Interspecific Competition – Barnacles of the Intertidal zone (Connell 1961) Interference competition took place in the middle intertidal zone. Exclude Balanus from the middle zone and Chthamalus could survive. ***outcomes depend on environment*** Interspecific Competition – Flour Beetles (Park 1954) Hot and humid = T. castaneum wins Cool and dry = T. confusum wins Uses temperature and moisture as variables ***outcomes depend on environment*** Interspecific Competition – Paramecium (Gause 1934) When grown alone, both species showed logistic growth. Paramecium Aurelia has the highest k , and drove P. caudatum extinct when grown
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BIOL 4253 Test 2 Experiments - Life History Trade Off in...

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