Does long-distance pollen dispersal preclude inbreeding in tropical trees? Fragmentation genetics ofDysoxylum malabaricumin an agro-forest landscape
| Autor: | Sascha A. Ismail, Chris J. Kettle, Cheppudira G. Kushalappa, Gudasalamani Ravikanth, R. Uma Shaanker, Jaboury Ghazoul |
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| Rok vydání: | 2012 |
| Předmět: |
Gene Flow
Conservation of Natural Resources DNA Plant Pollination Population India Biology medicine.disease_cause Trees Gene flow Pollen Genetics medicine Inbreeding Meliaceae education Ecosystem Ecology Evolution Behavior and Systematics Fragmentation (reproduction) Tropical Climate Genetic diversity education.field_of_study Habitat fragmentation Ecology Genetics Population Genetic structure Microsatellite Repeats |
| Zdroj: | Molecular Ecology. 21:5484-5496 |
| ISSN: | 0962-1083 |
| DOI: | 10.1111/mec.12054 |
| Popis: | Tropical trees often display long-distance pollen dispersal, even in highly fragmented landscapes. Understanding how patterns of spatial isolation influence pollen dispersal and interact with background patterns of fine-scale spatial genetic structure (FSGS) is critical for evaluating the genetic consequences of habitat fragmentation. In the endangered tropical timber tree Dysoxylum malabaricum (Meliaceae), we apply eleven microsatellite markers with paternity and parentage analysis to directly estimate historic gene flow and contemporary pollen dispersal across a large area (216 km(2)) in a highly fragmented agro-forest landscape. A comparison of genetic diversity and genetic structure in adult and juvenile life stages indicates an increase in differentiation and FSGS over time. Paternity analysis and parentage analysis demonstrate high genetic connectivity across the landscape by pollen dispersal. A comparison between mother trees in forest patches with low and high densities of adult trees shows that the frequency of short-distance mating increases, as does average kinship among mates in low-density stands. This indicates that there are potentially negative genetic consequences of low population density associated with forest fragmentation. Single isolated trees, in contrast, frequently receive heterogeneous pollen from distances exceeding 5 km. We discuss the processes leading to the observed patterns of pollen dispersal and the implications of this for conservation management of D. malabaricum and tropical trees more generally. |
| Databáze: | OpenAIRE |
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