BIO 2129 Lecture Notes - Thrips

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17 Jul 2014
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Regulated by something intrinsic: number of eggs per clutch: as increase pop density, decrease birth rate. Ewer eggs per clutch as you go up pop. Suggests that growth is dependent on density of species. Coefficient of determination: how precisely one variable determines another (60% of variation in clutch size is dependent on density: y axis: proportion of birds that have second clutch of eggs. Inc pop density, birds less frequently lay second clutch. Affects growth rate: tot eggs laid by female: inc pop density. Birth rates are going down as pop density increases. Mortatlity: pop size at beginning and end of season larger gap between opbserved survival rates and if all survived: mort increase with pop density. : resource competition, disease, interference competition (aggression for no competition) Consequence: population density tends to approach a stable value: population regulation, depend on changes in birth and deaths in a pop density dependent population.

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