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Titolo:
The annual number of breeding adults and the effective population size of syntopic newts (Triturus cristatus, T-marmoratus)
Autore:
Jehle, R; Arntzen, W; Burke, T; Krupa, AP; Hodl, W;
Indirizzi:
Univ Vienna, Inst Zool, A-1090 Vienna, Austria Univ Vienna Vienna Austria A-1090 nna, Inst Zool, A-1090 Vienna, Austria Univ Porto, Unidade Genet Anim & Conservacao, P-4480 Crasto, Vila Do Conde, Portugal Univ Porto Crasto Vila Do Conde Portugal P-4480 , Vila Do Conde, Portugal Univ Sheffield, Dept Anim & Plant Sci, Sheffield S10 2TN, S Yorkshire, England Univ Sheffield Sheffield S Yorkshire England S10 2TN S Yorkshire, England
Titolo Testata:
MOLECULAR ECOLOGY
fascicolo: 4, volume: 10, anno: 2001,
pagine: 839 - 850
SICI:
0962-1083(200104)10:4<839:TANOBA>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALLELE FREQUENCY DATA; GENETIC-VARIATION; MICROSATELLITE LOCI; BUFO-BUFO; OVERLAPPING GENERATIONS; TEMPORAL CHANGES; ATLANTIC SALMON; HYBRID ZONE; DRIFT; TOAD;
Keywords:
effective number of breeders; effective population size; microsatellites; temporal method; Triturus cristatus; Triturus marmoratus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Jehle, R Univ Vienna, Inst Zool, Althanstr 14, A-1090 Vienna, Austria UnivVienna Althanstr 14 Vienna Austria A-1090 0 Vienna, Austria
Citazione:
R. Jehle et al., "The annual number of breeding adults and the effective population size of syntopic newts (Triturus cristatus, T-marmoratus)", MOL ECOL, 10(4), 2001, pp. 839-850

Abstract

Pond-breeding amphibians are deme-structured organisms with a population genetic structure particularly susceptible to demographic threats. We estimated the effective number of breeding adults (N-b) and the effective population size (N-e) of the European urodele amphibians Triturus cristatus (the crested newt) and T. marmoratus (the marbled newt), using temporal shifts inmicrosatellite allele frequencies. Eight microsatellite loci isolated froma T. cristatus library were used, five of which proved polymorphic in T. marmoratus, albeit with high frequencies of null alleles at two loci. Three ponds in western France were sampled, situated 4-10 kilometres apart and inhabited by both species. Parent-offspring cohort comparisons were used to measure N-b; samples collected at time intervals of nine or 12 years, respectively, were used to measure N-e. The adult population census size (N) was determined by mark-recapture techniques. With one exception, genetic distances (F-ST) between temporal samples were lower than among populations. N-b ranged between 10.6 and 101.8 individuals, N-e ranged between 9.6 and 13.4 individuals. For the pond where both parameters were available, N-b/N (overall range: 0.10-0.19) was marginally larger than N-e/N (overall range: 0.09-0.16), which is reflected in the temporal stability of N. In line with theobserved differences in reproductive life-histories between the species, N-b/N ratios for newts were about one order of magnitude higher than for theanuran amphibian Bufo bufo. Despite of the colonization of the study area by T. cristatus only some decades ago, no significant genetic bottleneck could be detected. Our findings give rise to concerns about the long-term demographic viability of amphibian populations in situations typical for European landscapes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 00:23:10