Realistic levels of inbreeding depression strongly affect extinction risk in wild populations
The role of inbreeding depression in the extinction of wild populations is controversial, largely because there are no quantitative estimates of its impact using realistic levels of inbreeding depression. To address this deficiency, this study (1) provides a comprehensive estimate of the impact of i...
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| Veröffentlicht in: | Biological conservation 2006-11, Vol.133 (1), p.42-51 |
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| creator | O’Grady, Julian J. Brook, Barry W. Reed, David H. Ballou, Jonathan D. Tonkyn, David W. Frankham, Richard |
| description | The role of inbreeding depression in the extinction of wild populations is controversial, largely because there are no quantitative estimates of its impact using realistic levels of inbreeding depression. To address this deficiency, this study (1) provides a comprehensive estimate of the impact of inbreeding depression on wild, mammalian and avian species via a meta-analysis, and (2) determines the impact of this level of inbreeding depression on extinction risk over a broad taxonomic range via stochastic computer projections with and without inbreeding depression for populations with carrying capacities of 100, 500 and 2000 individuals. An average overall effect of 12 diploid lethal equivalents was found across the life-history of the species in the meta-analysis. In the stochastic computer projections, 12 diploid lethal equivalents of inbreeding depression (with purging) decreased median times to extinction by an average of 37%. These decreases were significant and of very similar magnitude, regardless of the carrying capacity modelled. Disregarding the influence of inbreeding depression on extinction risk will lead to serious overestimates of the survival prospects of threatened mammalian and avian taxa. Further, inappropriate recovery plans may be instituted if the causes of extinction risk and their relative contributions are not recognized. |
| doi_str_mv | 10.1016/j.biocon.2006.05.016 |
| format | Article |
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Psychology</topic><topic>Genetic stochasticity</topic><topic>Lethal equivalents</topic><topic>Mammalia</topic><topic>Mammals</topic><topic>Parks, reserves, wildlife conservation. Endangered species: population survey and restocking</topic><topic>Population viability analysis</topic><topic>Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>O’Grady, Julian J.</creatorcontrib><creatorcontrib>Brook, Barry W.</creatorcontrib><creatorcontrib>Reed, David H.</creatorcontrib><creatorcontrib>Ballou, Jonathan D.</creatorcontrib><creatorcontrib>Tonkyn, David W.</creatorcontrib><creatorcontrib>Frankham, Richard</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Environment Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Environment Abstracts</collection><collection>Ecology Abstracts</collection><collection>Sustainability Science Abstracts</collection><jtitle>Biological conservation</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>O’Grady, Julian J.</au><au>Brook, Barry W.</au><au>Reed, David H.</au><au>Ballou, Jonathan D.</au><au>Tonkyn, David W.</au><au>Frankham, Richard</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Realistic levels of inbreeding depression strongly affect extinction risk in wild populations</atitle><jtitle>Biological conservation</jtitle><date>2006-11-01</date><risdate>2006</risdate><volume>133</volume><issue>1</issue><spage>42</spage><epage>51</epage><pages>42-51</pages><issn>0006-3207</issn><eissn>1873-2917</eissn><coden>BICOBK</coden><abstract>The role of inbreeding depression in the extinction of wild populations is controversial, largely because there are no quantitative estimates of its impact using realistic levels of inbreeding depression. To address this deficiency, this study (1) provides a comprehensive estimate of the impact of inbreeding depression on wild, mammalian and avian species via a meta-analysis, and (2) determines the impact of this level of inbreeding depression on extinction risk over a broad taxonomic range via stochastic computer projections with and without inbreeding depression for populations with carrying capacities of 100, 500 and 2000 individuals. An average overall effect of 12 diploid lethal equivalents was found across the life-history of the species in the meta-analysis. In the stochastic computer projections, 12 diploid lethal equivalents of inbreeding depression (with purging) decreased median times to extinction by an average of 37%. These decreases were significant and of very similar magnitude, regardless of the carrying capacity modelled. Disregarding the influence of inbreeding depression on extinction risk will lead to serious overestimates of the survival prospects of threatened mammalian and avian taxa. Further, inappropriate recovery plans may be instituted if the causes of extinction risk and their relative contributions are not recognized.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.biocon.2006.05.016</doi><tpages>10</tpages></addata></record> |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Animal, plant and microbial ecology Applied ecology Biological and medical sciences Birds Conservation, protection and management of environment and wildlife Fundamental and applied biological sciences. Psychology Genetic stochasticity Lethal equivalents Mammalia Mammals Parks, reserves, wildlife conservation. Endangered species: population survey and restocking Population viability analysis Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution |
| title | Realistic levels of inbreeding depression strongly affect extinction risk in wild populations |
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