Meta-analysis of genetic representativeness of plant populations under ex situ conservation in contrast to wild source populations
This article is protected by copyright. All rights reserved.
| Publié dans: | Conservation biology : the journal of the Society for Conservation Biology. - 1989. - (2020) vom: 24. Aug. |
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| Auteur principal: | |
| Autres auteurs: | |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2020
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| Accès à la collection: | Conservation biology : the journal of the Society for Conservation Biology |
| Sujets: | Journal Article Review biodiversity conservation genetic differentiation genetic erosion living ex-situ collection sampling strategy seed bank small population size |
| Résumé: | This article is protected by copyright. All rights reserved. Ex-situ conservation is widely used to protect wild plant species from extinction. However, it remains unclear how genetic variation of ex-situ plant collections reflects wild source population diversity. Here, we conduct a global meta-analysis of the genetic representativeness of ex-situ populations by comparing genetic diversity (i.e. AR, allelic richness; HE , expected heterozygosity; PPB, percentage polymorphic bands; and SWI, Shannon-Winner index), inbreeding coefficient (FIS ), and genetic differentiation between ex-situ plant collections and their wild source populations. Genetic diversity (i.e., HE , PPB, and SWI) was significantly lower in ex-situ populations than their wild source populations, while genetic differentiation between ex-situ and wild populations (ex-situ-wild FST ), but not that among ex-situ populations, was significantly higher than among wild populations. Outcrossing species, but not those with mixed mating system, had significantly lower genetic diversity in ex-situ populations, and significantly higher ex-situ-wild FST . When the collection size for ex-situ conservation was ≥30 or 50, PPB, HE , and ex-situ-wild FST were not significantly different between ex-situ and wild populations, indicating a relatively high genetic representativeness. Collecting from the entire natural distribution range and mixing collections from different sources could significantly increase the genetic representativeness of ex-situ populations. Type of ex-situ conservation (i.e., planting or seed bank) had no effect on genetic representativeness. The effect size of HE decreased and the effect size of ex-situ-wild FST increased with the duration of ex-situ conservation. Our results suggest that current ex-situ plant collections do not effectively capture the genetic variation of wild populations. Low genetic representativeness of ex-situ populations was caused by both initial incomplete sampling from wild populations and genetic erosion during ex-situ conservation. We emphasize that it is necessary to employ more thorough sampling strategies in future collecting efforts and to add new individuals where needed. Article impact statement: Low genetic representativeness of living plant collections is a worldwide problem in ex situ conservation. This article is protected by copyright. All rights reserved |
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| Description: | Date Revised 27.02.2024 published: Print-Electronic Citation Status Publisher |
| ISSN: | 1523-1739 |
| DOI: | 10.1111/cobi.13617 |