We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Characterizing dispersal patterns in a threatened seabird with limited genetic structure.
- Authors
HALL, LAURIE A.; PALSBØLL, PER J.; BEISSINGER, STEVEN R.; HARVEY, JAMES T.; BÉRUBÉ, MARTINE; RAPHAEL, MARTIN G.; NELSON, S. KIM; GOLIGHTLY, RICHARD T.; MCFARLANE-TRANQUILLA, LAURA; NEWMAN, SCOTT H.; PEERY, M. ZACHARIAH
- Abstract
Genetic assignment methods provide an appealing approach for characterizing dispersal patterns on ecological time scales, but require sufficient genetic differentiation to accurately identify migrants and a large enough sample size of migrants to, for example, compare dispersal between sexes or age classes. We demonstrate that assignment methods can be rigorously used to characterize dispersal patterns in a marbled murrelet ( Brachyramphus marmoratus) population from central California that numbers approximately 600 individuals and is only moderately differentiated ( FST∼ 0.03) from larger populations to the north. We used coalescent simulations to select a significance level that resulted in a low and approximately equal expected number of type I and II errors and then used this significance level to identify a population of origin for 589 individuals genotyped at 13 microsatellite loci. The proportion of migrants in central California was greatest during winter when 83% of individuals were classified as migrants compared to lower proportions during the breeding (6%) and post-breeding (8%) seasons. Dispersal was also biased toward young and female individuals, as is typical in birds. Migrants were rarely members of parent-offspring pairs, suggesting that they contributed few young to the central California population. A greater number of migrants than expected under equilibrium conditions, a lack of individuals with mixed ancestry, and a small number of potential source populations (two), likely allowed us to use assignment methods to rigorously characterize dispersal patterns for a population that was larger and less differentiated than typically thought required for the identification of migrants.
- Subjects
CALIFORNIA; BIRD migration; MARBLED murrelet; MICROSATELLITE repeats; GENOTYPE-environment interaction; ANIMAL breeding; ANIMAL populations; GENETIC engineering; ANIMAL dispersal
- Publication
Molecular Ecology, 2009, Vol 18, Issue 24, p5074
- ISSN
0962-1083
- Publication type
Article
- DOI
10.1111/j.1365-294X.2009.04416.x