globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.foreco.2016.08.003
Scopus记录号: 2-s2.0-84982839140
论文题名:
High selfing rate, limited pollen dispersal and inbreeding depression in the emblematic African rain forest tree Baillonella toxisperma – Management implications
作者: Duminil J.; Mendene Abessolo D.T.; Ndiade Bourobou D.; Doucet J.-L.; Loo J.; Hardy O.J.
刊名: Forest Ecology and Management
ISSN:  0378-1127
出版年: 2016
卷: 379
起始页码: 20
结束页码: 29
语种: 英语
英文关键词: Gene flow ; Inbreeding ; Logging ; Selfing ; Spatial genetic structure ; Timber species
Scopus关键词: Genes ; Logging (forestry) ; Mammals ; Plants (botany) ; Population dynamics ; Population statistics ; Rain ; Reforestation ; Timber ; Gene flows ; Inbreeding ; Selfing ; Spatial genetic structure ; Timber species ; Forestry ; autogamy ; connectivity ; forest management ; gene flow ; genetic structure ; inbreeding ; logging (timber) ; pollen ; population dynamics ; rainforest ; seed dispersal ; selective breeding ; Congo Basin ; Baillonella toxisperma ; Mammalia ; Sapotaceae
英文摘要: Mating system and gene flow are major influencing factors of species population dynamics and evolution. These factors are often not characterized in tropical tree species, yet they constitute basic information that must be considered to implement sustainable management practices. In particular, as logging implies a reduction of the density of congeneric mates, the connectivity through pollination between individuals has to be well characterized (selfing versus outcrossing rates, distances between mates). We conducted a genetic-based analysis (using 10 nuclear microsatellites) to determine the mating system and gene flow characteristics of an emblematic timber tree species from lowland rain forests of the Congo Basin, Baillonella toxisperma (Sapotaceae). The species, which is frequently exploited for its wood and for a number of non-timber forest products, naturally occurs at low densities (ca. 0.01–0.1 individuals/ha). It is supposedly an entomophilous species whose seeds are probably dispersed by mammals. We have shown that the species presents a mixed-mating system (about 20–40% of selfing depending on analysis method). However, the comparison of inbreeding parameters among cohorts suggests that inbred individuals die between seedling and mature tree stages. The mean pollen dispersal distance was relatively low for such a low-density population species (estimated to be 690 or 777 m depending on analysis method) and, together with a low mean number of pollen donors (NEP = 2.76), it suggests a pattern of nearest-neighbour mating where allo-pollen could be a limiting factor. However, B. toxisperma presents a relatively weak genetic structure (Sp statistic = 0.0095) indicative of long gene dispersal distance (σg = 3–5 km according to the assumed effective population density). Overall, this would indicate that gene flow occurs mainly by extensive seed dispersal in this species. These results suggest that mammals and local populations involved in the dispersal of the species play a key role by lowering biparental inbreeding effects. Sustainable population management might require assisted regeneration using unrelated planting material. © 2016 The Author(s)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64747
Appears in Collections:影响、适应和脆弱性

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作者单位: Bioversity International, Forest Genetic Resources Programme, Sub-Regional Office for Central Africa, P.O. Box 2008 Messa, Yaoundé, Cameroon; Evolutionary Biology and Ecology, CP160/12, Faculté des Sciences, Université Libre de Bruxelles, 50 Av. F. Roosevelt, 1050 Brussels, Belgium; Institut de Recherche pour le Développement, UMR-DIADE, BP 64501, Montpellier, France; Institut de Recherche en Ecologie Tropicale (IRET), Centre Nationale de la Recherche Scientifique et Technologique (CENAREST), Libreville, Gabon; Institut de Recherches Agronomiques et Forestières (IRAF), Centre Nationale de la Recherche Scientifique et Technologique (CENAREST), Libreville, Gabon; Foresterie Tropicale, Gestion des Ressources Forestières et des Milieux Naturels, TERRA, Gembloux Agro-Bio Tech, Université de Liège, Passage des Déportés, 5030 Gembloux, Belgium; Bioversity International, Headquarters, Via dei Tre Denari, 472/a, Maccarese (Fiumicino), Rome, Italy

Recommended Citation:
Duminil J.,Mendene Abessolo D.T.,Ndiade Bourobou D.,et al. High selfing rate, limited pollen dispersal and inbreeding depression in the emblematic African rain forest tree Baillonella toxisperma – Management implications[J]. Forest Ecology and Management,2016-01-01,379
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