Dynamics of a declining amphibian metapopulation”

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Informative Summary: “ Dynamics of a declining amphibian metapopulation”

A. Griffiths, Richard, Sewell, David, S. McCrea, Rachel. “Dynamics of a declining amphibian metapopulation: Survival,dispersal and the impact of climate”. Biologial Conservation. (Feb 2010).485-491.

During a study in United Kingdom a group of researchers examined the declining population of amphibians, concentratingmainly on survival, dispersal and the impact of the climate. The object of the study are the amphibians, in concrete the causes of the decline in the great crested newts population. The investigationtakes place in Canterbury, United Kingdom, over the course of 12 years, from 1994 to 2006. Researchers examined the data from different ponds where newts were located.

The purpose is to definethe climatic factors that can influence population dynamics, deterministically which determines behavior through genetics, or stochastically, where behavior occurs randomly. These terms involve thefactors of the animal genetics to explain the evolution of the metapopulations.

Through the analysis of recounting births and death rates it was possible to determine the approximate number ofindividuals, but the study was centered in the reasons of the declination in the survival. However, prior to the study reserchers presented a thesis that climate is the cause of the changes in the dynamicsand the conservation of the metapuplation´s system. The term metapopulation is referred to the subdivided populations that have a spatial structure. According to the study, it is very

common thatamphibians are patchy breeders, which consequently increases the percentage of stochastic extinction dynamics. Therefore its important for scientists to study and control the regional factors to knowin which measure the single populations will be impacted.

The hypothesis is the followed: First, the annual survival varies between subpopulations. Second the annual survival is related to...
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