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Effective population size/adult population size ratios in wildlife: a review

  • Richard Frankham (a1)

The effective population size is required to predict the rate of inbreeding and loss of genetic variation in wildlife. Since only census population size is normally available, it is critical to know the ratio of effective to actual population size (Ne/N). Published estimates of Ne/N (192 from 102 species) were analysed to identify major variables affecting the ratio, and to obtain a comprehensive estimate of the ratio with all relevant variables included. The five most important variables explaining variation among estimates, in order of importance, were fluctuation in population size, variance in family size, form of N used (adults υ. breeders υ. total size), taxonomic group and unequal sex-ratio. There were no significant effects on the ratio of high υ. low fecundity, demographic υ. genetic methods of estimation, or of overlapping υ. non-overlapping generations when the same variables were included in estimates. Comprehensive estimates of Ne/N (that included the effects of fluctuation in population size, variance in family size and unequal sex-ratio) averaged only 0·10–0·11. Wildlife populations have much smaller effective population sizes than previously recognized.

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M. C. Baker (1981). Effective population size in a songbird: some possible implications. Heredity 46, 209218.

J. W. Barrett , P. Knowles & W. M. Cheliak (1987). The mating system in a black spruce clonal seed orchard. Canadian Journal of Forest Research 17, 379382.

D. Bartley , M. Bagley , G. Gall & B. Bentley (1992). Use of linkage disequilibrium data to estimate effective size of hatchery and natural fish populations. Conservation Biology 6, 365375.

M. Begon (1977). The effective size of a natural Drosophila subobscura population. Heredity 38, 1318.

M. Begon , C. B. Krimbas & M. Loukas (1980). The genetics of Drosophila subobscura populations. XV. Effective size of a natural population estimated by three independent methods. Heredity 45, 335350.

W. J. Berg (1987). Effective population size estimates and inbreeding in feral horses: a preliminary assessment. Equine Veterinary Science 6, 240245.

J. Berger & C. Cunningham (1995). Multiple bottlenecks, allopatric lineages and badlands bison Bos bison: consequences of lineage mixing. Biological Conservation 71, 1223.

K. A. Berven & T. A. Grudzien (1990). Dispersal in the wood frog (Rana sylvatica): implications for genetic population structure. Evolution 44, 20472056.

B. F. Blackwell , J. M. Reed , J. R. Walters & P. D. Doerr (1995). Inbreeding rate and effective population size: a comparison of estimates from pedigree analysis and a demographic model. Biological Conservation 71, 299304.

S. C. Borlase , D. A. Loebel , R. Frankham , R. K. Nurthen , D. A. Briscoe & G. E. Daggard (1993). Modeling problems in conservation genetics using captive Drosophila populations: consequences of equalization of family sizes. Conservation Biology 7, 122131.

D. A. Briscoe , J. M. Malpica , A. Robertson , G. J. Smith , R. Frankham , R. G. Banks & J. S. F. Barker (1992). Rapid loss of genetic variation in large captive populations of Drosophila flies: Implications for genetic management of captive populations. Conservation Biology 6, 416425.

J. Briton , R. K. Nurthen , D. A. Briscoe & R. Frankham (1994). Modelling problems in conservation genetics using captive Drosophila populations: Consequences of harems. Biological Conservation 69, 267275.

J. F. Y. Brookfield & P. M. Sharp (1994). Neutralism and selectionism face up to DNA data. Trends in Genetics 10, 109111.

R. K. Butlin & T. H. Day (1989). Environment correlates of inversion frequencies in natural populations of seaweed flies (Coelopa frigida). Heredity 62, 223232.

A. Caballero (1994). Developments in the prediction of effective population size. Heredity 73, 657679.

J. B. Carroll & G. M. Mace (1988). Population management of the Rodrigues fruit bat Pteropus rodricensis in captivity. International Zoo Yearbook 27, 7078.

W. M. Cheliak , J. A. Pitel & G. Murray (1985). Population structure and the mating system of white spruce. Canadian Journal of Forest Research 15, 301308.

J. F. Crow & N. E. Morton (1955). Measurement of gene frequency drift in small populations. Evolution 9, 202214.

J. C. Daly (1981). Effects of social organization and environmental diversity on determining the genetic structure of a population of wild rabbits, Oryctolagus cuniculus. Evolution 35, 689706.

D. Debouzie (1980). Estimate of variance effective population size in a laboratory Ceratitis population. Heredity 45, 297299.

E. Dinerstein & G. F. McCracken (1990). Endangered greater one-horned rhinoceros carry high levels of genetic variation. Conservation Biology 4, 417422.

S. Easteal & R. B. Floyd (1986). The ecological genetics of introduced populations of the giant toad, Bufo marinus (Amphibia: Anura): dispersal and neighbourhood size. Biological Journal of the Linnean Society 27, 1745.

L. E. Eguiarte , A. Burquez , J. Rodriguez , M. Martinez-Ramos , J. Sarukhan & D. Pinero (1993). Direct and indirect estimates of neighborhood and effective population size in a tropical palm Astrocaryum mexicanum. Evolution 47, 7587.

T. H. Emigh & E. Pollak (1979). Fixation probabilities and effective population numbers in diploid populations with overlapping generations. Theoretical Population Biology 15, 86107.

C. B. Fenster (1991). Gene flow in Chamaecrista fasciculata (Leguminosae) II. Gene establishment. Evolution 45, 410422.

R. C. Fleischer (1983). A comparison of theoretical and electrophoretic assessments of genetic structure in populations of the house sparrow (Passer domesticus). Evolution 37, 10011009.

N. N. FitzSimmons , S. W. Buskirk , M. H. Smith (1995). Population history, genetic variability, and horn growth in bighorn sheep. Conservation Biology 9, 314323.

D. E. Gill (1978). Effective population size and interdemic migration rates in a metapopulation of the red-spotted newt, Notophthalmus viridescens (Rafinesque). Evolution 32, 839849.

R. S. Gowe , A. Robertson & B. D. H. Latter (1959). Environment and poultry breeding problems. 5. The design of poultry control strains. Poultry Science 38, 462471.

P. R. Grant & B. R. Grant (1992). Demography and the genetically effective size of two populations of Darwin's finches. Ecology 73, 766784.

J. J. D. Greenwood (1974). Effective population size in the snail Cepaea nemoralis. Evolution 28, 513526.

H. Harpending & S. Cowan (1986). Primate population structure: evaluation of models. American Journal of Physical Anthropology 70, 6368.

D. Hedgecock , V. Chow & R. S. Waples (1992). Effective population numbers of shellfish broodstocks estimated from temporal variance in allelic frequencies. Aquaculture 108, 215232.

J. S. Heywood (1986). The effect of plant size variation on genetic drift in populations of annuals. American Naturalist 127, 851861.

B. C. Husband & S. C. Barrett H. (1992). Effective population size and genetic drift in tristylous Eichhornia paniculata (Pontederiaceae). Evolution 46, 18751890.

Y. Imaizumi , M. Nei & T. Furusho (1970). Variability and heritability of human fertility. Annals of Human Genetics 33, 251259.

H. W. Kerster (1964). Neighborhood size in the rusty lizard, Sceloporus olivaceus. Evolution 18, 445457.

M. F. Kinnaird & T. G. O'Brien (1991). Viable populations for an endangered forest primate, the Tana River crested mangabey (Cercocebus galeritus galeritus). Conservation Biology 5, 203213.

R. Lande (1979). Effective deme size during long-term evolution estimated from rates of chromosomal rearrangement. Evolution 33, 234251.

G. M. Mace & R. Lande (1991). Assessing extinction threats: towards a reevaluation of IUCN threatened species categories. Conservation Biology 5, 148157.

J. M. Malpica & D. A. Briscoe (1981). Effective population number estimates of laboratory populations of Drosophila melanogaster. Experientia 37, 947948.

J. M. Marzluff & R. P. Balda (1989). Causes and consequences of female-biased dispersal in a flock-living bird, the Pinyon jay. Ecology 70, 316328.

D. J. Merrell (1968). A comparison of the estimated and the ‘effective size’ of breeding populations of the leopard frog Rana pipiens. Evolution 22, 274283.

N. E. Morton & J. M. Lalouel (1973). Bioassay of kinship in Micronesia. American Journal of Physical Anthropology 38, 709720.

M. Nei & Y. Imaizumi (1966). Genetic structure of human populations. II. Differentiation of blood group gene frequencies among isolated populations. Heredity 21, 183190.

K. Nozawa (1963). Competition between brown gene and its wild-type allele in Drosophila melanogaster. II. Estimation of relative viability of brown homozygotes and an analysis of change in gene-frequency. Japanese Journal of Genetics 38, 620.

K. Nozawa (1972). Population genetics of Japanese monkeys. I. Estimation of the effective troop size. Primates 13, 381393.

L. Nunney (1993). The influence of mating system and overlapping generations on effective population size. Evolution 47, 13291341.

L. Nunney & K. A. Campbell (1993). Assessing minimum viable population size: demography meets population genetics. Trends in Ecology and Evolution 8, 234239.

L. Nunney & D. R. Elam (1994). Estimating the effective population size of conserved populations. Conservation Biology 8, 175184.

K. Ralls , J. Ballou & R. L. Brownell Jr. (1983). Genetic diversity in California sea otters: theoretical considerations and management implications. Biological Conservation 25, 209232.

J. M. Reed , J. R. Walters , T. E. Emigh & D. E. Seaman (1993). The effective population size in red-cockaded woodpeckers: Population and model differences. Conservation Biology 7, 302308.

N. Ryman , R. Baccus , C. Reuterwall & M. H. Smith (1981). Effective population size, generation interval, and potential loss of genetic variability in game species under different hunting regimes. Oikos 36, 257266.

F. M. Salzano (1971). Demographic and genetic interrelationships among the Cayapo Indians of Brazil. Social Biology 18, 148157.

D. J. Schoen & A. H. D. Brown (1991). Intraspecific variation in population gene diversity and effective size correlates with the mating system in plants. Proceedings of the National Academy of Sciences, USA88, 44944497.

A. M. Shull & A. R. Tipton (1987). Effective population size of bison on the Whichita Mountains Wildlife Refuge. Conservation Biology 1, 3541.

R. C. Simon , J. D. Mclntyre & A. R. Hemmingsen (1986). Family size and effective population size in a hatchery stock of Coho salmon (Oncorhynchus kisutch). Canadian Journal of Fisheries and Aquatic Science 43, 24342442.

J. L. D. Smith & C. McDougal (1991). The contribution of variance in lifetime reproduction to effective population size in tigers. Conservation Biology 5, 484490.

A. C. Taylor , W. B. Sherwin & R. K. Wayne (1994). Genetic variation of microsatellite loci in a bottlenecked species: the northern hairy-nosed wombat Lasiorhinus krefftii. Molecular Ecology 3, 277290.

A. R. Templeton & B. Read (1994). Inbreeding: One word, several meanings, much confusion. In Conservation Genetics (ed. V. Loeschcke , J. Tomiuk and S. K. Jain ), pp. 91105. Basel: Birkhauser.

R. K. Wayne , S. B. George , D. Gilbert , P. W. Collins , S. D. Kovach , D. Girman & N. Lehman (1991). A morphologic and genetic study of the Island fox, Urocyon littoralis. Evolution 45, 18491868.

J. W. Wood (1987). The genetic demography of the Gainj of Papua New Guinea. 2. Determinants of effective population size. American Naturalist 129, 165187.

L. M. Woodworth , M. E. Montgomery , R. K. Nurthen , D. A. Briscoe & R. Frankham (1994). Modelling problems in conservation genetics using Drosophila: consequences of fluctuating population sizes. Molecular Ecology 3, 393400.

T. P. Young (1994). Natural die-offs of large mammals: Implications for conservation. Conservation Biology 8, 410418.

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Genetics Research
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