6 - Ecological factors in population persistence

If r is low then any major catastrophy may wipe out

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Unformatted text preview: on If V(r) is high, then high fluctuations in N may bring a population to the point of extinction, especially if r is low r should have a greater effect on P of extinction than V(r) because of its consequences for the speed of recovery M6.25 BIO 3115 Université d’Ottawa / University of Ottawa deme: semi- isolated local populations inhabiting areas of suitable habitat, separated from other populations by unsuitable habitat. source: habitats in which local reproductive success exceeds local mortality sink: habitats in which local mortality exceeds local reproductive success. Sources and sinks linked by immigration & emigration Sink Source Time Time Population size Metapopulation structure Source Sink M6.26 BIO 3115 Université d’Ottawa / University of Ottawa M6.13 BIO 3115 Conservation Biology Metapopulation structure: implications Habitats where population density is highest needn’t be sources. Sources are habitats where population growth rate is the largest. So, if we use population density to determine conservation value of habitats, important source habitats may not be preserved. Therefore, we must establish the role of habitats involved (source versus sink) by determining population growth rates in different habitats. M6.27 BIO 3115 Université d’Ottawa / University of Ottawa Metapopulation structure: conservation implications Trying to augment population densities in sink habitats may be less productive than trying to enhance source populations. E.g. in California, the northern population of the peregrine falcon acts as a source for the southern sink population. The regional strategy has involved release of captive-reared individuals in the southern population. However, reintroduction should be done in the northern population (source), where chances of success should be higher. M6.28 BIO 3115 Université d’Ottawa / University of Ottawa M6.14 BIO 3115 Conservation Biology Persistence of populations, especially sinks, depends on immigration. If...
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This document was uploaded on 03/11/2014 for the course BIO 3115 at University of Ottawa.

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