title: Coastal pollution limits pelagic larval dispersal.
abstract: The ecological impact of large coastal human populations on marine ecosystems remains relatively unknown. Here, we examine the population structure of Patiria miniata, the bat star, and correlate genetic distances with a model based on flow rates and proximity to P. miniata populations for the four major stormwater runoff and wastewater effluent sources of the Southern California Bight. We show that overall genetic connectivity is high (F(ST)~0.005); however, multivariate analyses show that genetic structure is highly correlated with anthropogenic inputs. The best models included both stormwater and wastewater variables and explained between 26.55 and 93.69% of the observed structure. Additionally, regressions between allelic richness and distance to sources show that populations near anthropogenic pollution have reduced genetic diversity. Our results indicate that anthropogenic runoff and effluent are acting as barriers to larval dispersal, effectively isolating a high gene flow species that is virtually free of direct human impact.
authors.affiliation: Hawai'i Institute of Marine Biology, School of Ocean and Earth Science and Technology, University of Hawai'i at Mānoa, Kane'ohe, Hawaii 96744, USA. jpuritz@gmail.com
authors.forename: Jonathan B
authors.initials: JB
authors.lastname: Puritz
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Toonen
mesh_terms: D000818:Animals; D002140:California; D004272:DNA, Mitochondrial / Q000235:genetics; D017753:Ecosystem; D051456:Gene Flow; D014644:Genetic Variation; D006801:Humans; D007814:Larva / Q000235:genetics; D018895:Microsatellite Repeats; D015999:Multivariate Analysis; D058974:Phylogeography; D011157:Population Dynamics; D017422:Sequence Analysis, DNA; D012722:Sewage; D013215:Starfish / Q000235:genetics*; D014876:Water Pollution
chemical_list: D004272:DNA, Mitochondrial; D012722:Sewage