Spatial Structure and Population Extinction: A Study with Drosophila Flies

Spatial Structure and Population Extinction: A Study with Drosophila Flies Abstract: The total amount of habitat and also its distribution and subdivision affect the extinction probability of a resident population Two species of Drosophila are studied in spatial configurations of a single large habitat patch, single small habitat patches, and two small but connected habitat patches in which a low rate of migration, roughly one fly per generation, is possible. The single large habitat patch shows the lowest extinction rate lower than the combined rate of two small patches of the same total size. For one of the species, the “corridor” between the pair of small patches seems to produce a “rescue effect” that lowers extinction rates, probably due to a decrease in the coefficient of variation in fluctuations of the population sire in this coupled system. The systems seem to have been influenced by demographic stochasticity, based on the relationship of population size to extinction probability. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Conservation Biology Wiley

Spatial Structure and Population Extinction: A Study with Drosophila Flies

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Publisher
Wiley
Copyright
"Copyright © 1989 Wiley Subscription Services, Inc., A Wiley Company"
ISSN
0888-8892
eISSN
1523-1739
D.O.I.
10.1111/j.1523-1739.1989.tb00223.x
Publisher site
See Article on Publisher Site

Abstract

Abstract: The total amount of habitat and also its distribution and subdivision affect the extinction probability of a resident population Two species of Drosophila are studied in spatial configurations of a single large habitat patch, single small habitat patches, and two small but connected habitat patches in which a low rate of migration, roughly one fly per generation, is possible. The single large habitat patch shows the lowest extinction rate lower than the combined rate of two small patches of the same total size. For one of the species, the “corridor” between the pair of small patches seems to produce a “rescue effect” that lowers extinction rates, probably due to a decrease in the coefficient of variation in fluctuations of the population sire in this coupled system. The systems seem to have been influenced by demographic stochasticity, based on the relationship of population size to extinction probability.

Journal

Conservation BiologyWiley

Published: Mar 1, 1989

References

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