6 research outputs found
Admixed Kerr
This file contains multilocus data (15 microsatellite loci) for landlocked (Kerr Reservoir) hybrid alewife and blueback herring (n=119) used in analysis of genomic clines
Data from: Human disturbance causes the formation of a hybrid swarm between two naturally sympatric fish species
Most evidence for hybrid swarm formation stemming from anthropogenic habitat disturbance comes from the breakdown of reproductive isolation between incipient species, or introgression between allopatric species following secondary contact. Human impacts on hybridization between divergent species that naturally occur in sympatry has received considerably less attention. Theory predicts that reinforcement should act to preserve reproductive isolation under such circumstances, potentially making reproductive barriers resistant to human habitat alteration. Using 15 microsatellites we examined hybridization between sympatric populations of alewife (Alosa pseudoharengus) and blueback herring (A. aestivalis) to test whether the frequency of hybridization and pattern of introgression have been impacted by the construction of a dam that isolated formerly anadromous populations of both species in a landlocked freshwater reservoir. The frequency of hybridization and pattern of introgression differed markedly between anadromous and landlocked populations. The range-wide frequency of hybridization among anadromous populations was generally 0-8%, whereas all landlocked individuals were hybrids. Although neutral introgression was observed among anadromous hybrids, directional introgression leading to increased prevalence of alewife genotypes was detected among landlocked hybrids. We demonstrate that habitat alteration can lead to hybrid swarm formation between divergent species that naturally occur sympatrically, and provide empirical evidence that reinforcement does not always sustain reproductive isolation under such circumstances
Loci
This file contains locus information for the 15 microsatellite loci used in the analysis of genomic clines by Hasselman et al. (2014)
Admixed anadromous
This file contains multilocus data (15 microsatellite loci) for anadromous hybrid alewife and blueback herring (n=92) used in analysis of genomic clines
Parental BBH
This file contains multilocus data (15 microsatellite loci) for 100 purebred blueback herring specimens used in the simulation of hybrids (HYBRIDLAB v.1.0) and in the analysis of genomic clines by Hasselman et al. (2014)
Parental ALE
This file contains multilocus data (15 microsatellite loci) for 100 purebred alewife specimens used in the simulation of hybrids (HYBRIDLAB v.1.0) and in the analysis of genomic clines by Hasselman et al. (2014)