Fig 1.
Maps showing the distribution of American mink samples in three study sites (Koster Islands, North Coast and South Coast) in Sweden.
As in some locations more than one mink was culled, each point represents the location of at least one culled mink. Background map: Europe Base Map—Level 1 Provinces, AND Products B.V. and AND Data Ireland Limited, ESRI.
Fig 2.
Number of American mink removed from Koster Islands and the North Coast in consecutive culling seasons.
Table 1.
Genetic diversity indices of American mink from three sites in Sweden collected in consecutive years 2006–2011.
N–number of analysed samples; A–mean number of alleles per locus (direct count); Ar–allelic richness estimated by rarefaction based on a minimum sample size n = 7; Rare A–number of alleles with frequency ≤ 0,07 across all loci; A private–private alleles, HO−observed heterozygosity; uHE−unbiased expected heterozygosity. Year reflects the hunting season (e.g. 2006 indicates the hunting season of 2006/2007). P value after Bonferroni correction 0.0045.
Fig 3.
(upper panel) The relationship between genetic differentiations (pairwise FST) between consecutive years and the period (in years) between the culling of mink on the Koster Islands; (lower panel) the relationship between genetic differentiations (FST) between consecutive years and the period between the culling of mink on the Koster Islands and North Coast. Period calculated as year of sampling on Koster Island minus year of sampling on North Coast. Values of FST from S1 Table.
Table 2.
Results of hierarchical AMOVA comparing the genetic variation of American mink over 6 years within 3 sites in Sweden.
Fig 4.
Bayesian assignment of American mink from Sweden in the genetic clusters identified by STRUCTURE analysed in two hierarchical levels.
Each American mink is represented by a single vertical bar. The locality of origin and year of capture for each individual is indicated below. Dashed black lines indicate the threshold probabilities of 0.80 and 0.20, used to assign each individual to a single cluster. Red arrow indicates one individual from the South Coast which was caught in 2007 and was included with the group of mink caught in 2010. M–indicates individuals from Koster Island assigned as migrants from the coast at level 1.
Fig 5.
Discriminant analysis of principal components (DAPC) of American mink from Sweden grouped into 5 clusters (various colour) on the first two axes of DAPC.
The main graph plots show the first two discriminant axes (explaining 47.7 and 27.8% of the variation respectively). Each point represents an individual, colour indicates the assignment of an individual to a cluster, whereas shape indicates the site of origin of an individual.
Fig 6.
Distribution of all American mink samples and mink marked as migrants from the North Coast to Koster Islands (red circles) and from Koster Islands to the North Coast (brown circles).
The migrants were assigned by two methods: STRUCTURE with q ≥ 0.8 (panel A), GeneClass2 with probability ≤ 0.03 (panel B). Numbers indicate the number of migrants at each location. Arrows indicate the direction of sea current. Background map: Europe Base Map—Level 1 Provinces, AND Products B.V. and AND Data Ireland Limited, ESRI.
Table 3.
The proportion of migrants and the number of males and females dispersed between sites.
M–males; F–females. Information about sex was not available for all collected mink samples.
Table 4.
Recent migration rate (Nm) of American mink between three sites in Sweden.
Estimations are based on posterior means and modes calculated by BIMR. Within-site movement is marked in bold.
Table 5.
Estimates of effective population size (Ne) derived with different measures for American mink samples collected in the years 2006–2011 in Sweden.
LN–Linkage disequilibrium method, MC–Molecular coancestry method.