期刊
MARINE ECOLOGY PROGRESS SERIES
卷 544, 期 -, 页码 131-142出版社
INTER-RESEARCH
DOI: 10.3354/meps11607
关键词
Brown algae; External fertilizer; Spatial genetic structure; Inbreeding; Microsatellite markers; Spatial autocorrelation
资金
- FCT (Fundacao para a Ciencia e Tecnologia) [PTDC/MAR/104477/2008, EXCL/AAG-GLO/0661/2012, UID/Multi/04326/2013, SFRH/BPD/39097/2007]
- Fundação para a Ciência e a Tecnologia [PTDC/MAR/104477/2008, EXCL/AAG-GLO/0661/2012, SFRH/BPD/39097/2007] Funding Source: FCT
Fine-scale spatial genetic structure (SGS) within populations reflects the dispersal behaviour of genes and individuals. Here we studied very small-scale SGS and mating patterns in the brown seaweed Fucus vesiculosus, a dioecious marine broadcast spawner with immediate settlement upon gamete release, which is predicted to strongly restrict gene flow. We estimated SGS, inbreeding and kinship for adults and recruits from habitats with contrasting exposures and patchiness (open coast and estuarine ecosystems) using microsatellite loci. Heterozygote deficiency was found for most adult populations but it was even higher for recruits, indicating inbreeding depression. At the fine spatial resolution of this study there was no spatial genetic structuring for 3 of the 5 populations studied across different habitats. Habitat could not explain the unrestricted gene flow in some populations. In the kinship analyses, we identified more putative mothers than fathers, suggesting that male gamete dispersal mediates gene flow at broader distances. However, the vast majority of the parents of the recruits could not be found among the adults sampled nearby, indicating unrestricted gene flow at these small scales. We propose 3 nonexclusive hypotheses for our findings: (1) unrestricted gene flow, (2) inbreeding depression eliminating most inbred individuals resulting from nearby related parents, (3) temporal Wahlund effects, mediated by a hypothetic genetic pool of a bank of microscopic forms persisting from previous generations.
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