Assessing minimum viable population size: Demography meets population genetics.

The discussion of a population's minimum viable size provides a focus for the study of ecological and genetic factors that influence the persistence of a threatened population. There are many causes of extinction and the fate of a specific population cannot generally be predicted. This uncertainty has been dealt with in two ways: through stochastic demographic models to determine how to minimize extinction probabilities; and through population genetic theory to determine how best to maintain genetic variation, in the belief that the ability to evolve helps buffer a population against the unknown. Recent work suggests that these two very different approaches lead to very similar conclusions, at least under panmictic conditions. However, defining the ideal spatial distribution for an endangered species remains an important challenge.

[1]  R. Ladle.  Parasites and sex: Catching the red queen. , 1992, Trends in ecology & evolution.

[2]  R. Chesser,et al.  Influence of gene flow and breeding tactics on gene diversity within populations. , 1991, Genetics.

[3]  Stuart L. Pimm,et al.  The variability of population densities , 1988, Nature.

[4]  S. Tuljapurkar,et al.  An uncertain life: demography in random environments. , 1989, Theoretical population biology.

[5]  P. Ehrlich,et al.  Biodiversity Studies: Science and Policy , 1991, Science.

[6]  R. Hobbs.  The role of corridors in conservation: Solution or bandwagon? , 1992, Trends in ecology & evolution.

[7]  A. Hoffmann,et al.  Evolutionary Genetics and Environmental Stress , 1991 .

[8]  W. Gabriel,et al.  Survival of small populations under demographic stochasticity. , 1992, Theoretical Population Biology.

[9]  F. Allendorf,et al.  Are Small Populations of Plants Worth Preserving , 1992 .

[10]  D. Alstad,et al.  Coevolution in insect herbivores and conifers. , 1978, Science.

[11]  R. Frankham,et al.  Rapid Loss of Genetic Variation in Large Captive Populations of Drosophila Flies: Implications for the Genetic Management of Captive Populations , 1992 .

[12]  T. Burkey,et al.  Extinction in nature reserves: the effect of fragmentation and the importance of migration between reserve fragments , 1989 .

[13]  S. Wright.  Evolution in mendelian populations , 1931 .

[14]  Georgina M. Mace,et al.  Assessing Extinction Threats: Toward a Reevaluation of IUCN Threatened Species Categories , 1991 .

[15]  Brian Dennis,et al.  Estimation of Growth and Extinction Parameters for Endangered Species , 1991 .

[16]  M. Shaffer.  Minimum Population Sizes for Species Conservation , 1981 .

[17]  L. Milne,et al.  The Balance of Nature , 1953, Oryx.

[18]  Andrew J. McMichael,et al.  Common West African HLA antigens are associated with protection from severe malaria , 1991, Nature.

[19]  M. Soulé,et al.  Viable Populations for Conservation , 1987 .

[20]  Jeremy J. Burdon,et al.  Gene-for-gene coevolution between plants and parasites , 1992, Nature.

[21]  R. L. Harrison.  Toward a Theory of Inter-Refuge Corridor Design , 1992 .

[22]  James A. Cox,et al.  Consequences and Costs of Conservation Corridors , 1987 .

[23]  James F. Quinn,et al.  Correlated environments and the persistence of metapopulations , 1989 .

[24]  M. Gilpin.  A Comment on Quinn and Hastings: Extinction in Subdivided Habitats , 1988 .

[25]  Alan Hastings,et al.  Extinction in Subdivided Habitats , 1987 .

[26]  R. Lande,et al.  Extinction Thresholds in Demographic Models of Territorial Populations , 1987, The American Naturalist.

[27]  M. Wade,et al.  EXTINCTION AND RECOLONIZATION: THEIR EFFECTS ON THE GENETIC DIFFERENTIATION OF LOCAL POPULATIONS , 1988, Evolution; international journal of organic evolution.

[28]  J. Lukáš,et al.  Prevalence and implications of feline coronavirus infections of captive and free-ranging cheetahs (Acinonyx jubatus) , 1990, Journal of virology.

[29]  D. Strebel.  Environmental fluctuations and extinction—Single species , 1985 .

[30]  M. Nei,et al.  Pattern of nucleotide substitution at major histocompatibility complex class I loci reveals overdominant selection , 1988, Nature.

[31]  K. Holsinger,et al.  Genetics and conservation of rare plants. , 1991 .

[32]  Chris D. Thomas,et al.  What Do Real Population Dynamics Tell Us About Minimum Viable Population Sizes , 1990 .

[33]  C. R. Meinertzhagen.  Pirates and predators , 1959 .

[34]  S. O'Brien,et al.  Interactive influence of infectious disease and genetic diversity in natural populations , 1988, Trends in Ecology & Evolution.