| Abstract: | Estimates of the effective number of breeding adults were derived for three semi-isolated populations of the common toad Bufo bufo based on temporal (i.e. adult-progeny) variance in allele frequency for three highly polymorphic minisatellite loci. Estimates of spatial variance in allele frequency among populations and of age-specific measures of genetic variability are also described. Each population was characterized by a low effective adult breeding number (N(b)) based on a large age-specific variance in minisatellite allele frequency. Estimates of N(b) (range 21-46 for population means across three loci) were ??? 55-230-fold lower than estimates of total adult census size. The implications of low effective breeding numbers for long-term maintenance of genetic variability and population viability are discussed relative to the species‘ reproductive ecology, current land-use practices, and present and historical habitat modification and loss. The utility of indirect measures of population parameters such as N(b) and N(e) based on time-series data of minisatellite allele frequencies is discussed relative to similar measures estimated from commonly used genetic markers such as protein allozymes. |
| Genre: | Article |
| ProdID: | 70019575 |
| Citation Author: | Scribner, K. T.; Arntzen, J. W.; Burke, T. |
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| Citation End Page: | 712 |
| Citation Issue: | 8 |
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| Citation Language: | English |
| Citation Larger Work Title: | Molecular Ecology |
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| Citation Number Of Pages: | 12 |
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| Citation Search Results Text: | Effective number of breeding adults in Bufo bufo estimated from age-specific variation at minisatellite loci; 1997; Article; Journal; Molecular Ecology; Scribner, K. T.; Arntzen, J. W.; Burke, T. |
| Citation Start Page: | 701 |
| Citation Volume: | 6 |
| Citation Year: | 1997 |
| Type: | citation/reference |
| Text: | Effective number of breeding adults in Bufo bufo estimated from age-specific variation at minisatellite loci; 1997; Article; Journal; Molecular Ecology; Scribner, K. T.; Arntzen, J. W.; Burke, T. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1997 00:00 -0600 |
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