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The larger the island, the fewer species it lost. Density-Dependent Factors = regulate populations according to the population density.
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II. Not until the development of community sanitation, immunization, and other public health measures did cities avoid periodic sharp drops in population as a result of epidemics.
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In fact, for most of the period since humans began living in cities, city populations have been maintained only through continual immigration from the countryside. For this reason, epidemics among humans are particularly severe in cities.
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has created a population cycle alternately favoring r-strategists and K-strategists. Example: Avian cholera can kill very large numbers of wintering or migrating waterfowl that are concentrated in relatively small areas.
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Can be important factors regulating population sizes in some cases. 3) Parasites and Disease = have the greatest effect at high population densities.
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hope this helps :DEvidently the growth rate (r) declines as the density of the population approaches a certain limiting value. Density-independent factors are factors such as temperature, storms, floods, drought, or habitat disruption that affects all populations, regardless of their density.
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A series of ponds, a range of mountain tops, scattered groves of citrus trees, even individual trees within a grove, all are made up of patches of habitat separated by barriers to the free migration of their inhabitants.
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2307/1935619]More recently, the great influenza pandemic of 1918–1919 is thought to have killed over 20 million people worldwide.
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[doi:10. Density Dependent and Density Independent Regulation of Reproduction in the Gila Topminnow, Poeciliopsis Occidentalis (Baird and Girard) Ecology 58:438–444.
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Density Dependent factors are a limit in resources. Therefore, density dependent and density independent factors operate to regulate reproduction and neither is mutually exclusive.
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Water temperature and photoperiod act upon the fishes regardless of population density, whereas, nutrition influences and predation are proportionate to population density. Studies of the Gila topminnow, Poeciliopsis occidentalis, indicate that onset of reproduction, proportion of reproducing @V @V, and numbers of embryos carried by @V @V are influenced by H"2) temperature, photoperiod, food, and predation.
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