Data from: Relationship type affects the reliability of dispersal distance estimated using pedigree inferences in partially sampled populations: a case study involving invasive American mink in Scotland

Estimating dispersal—a key parameter for population ecology and management—is notoriously difficult. The use of pedigree assignments, aided by likelihood-based software, has become popular to estimate dispersal rate and distance. However, the partial sampling of populations may produce false assignments. Further, it is unknown how the accuracy of assignment is affected by the genealogical relationships of individuals and is reflected by software-derived assignment probabilities. Inspired by a project managing invasive American mink (Neovison vison), we estimated individual dispersal distances using inferred pairwise relationships of culled individuals. Additionally, we simulated scenarios to investigate the accuracy of pairwise inferences. Estimates of dispersal distance varied greatly when derived from different inferred pairwise relationships, with mother–offspring relationship being the shortest (average = 21 km) and the most accurate. Pairs assigned as maternal half-siblings were inaccurate, with 64%–97% falsely assigned, implying that estimates for these relationships in the wild population were unreliable. The false assignment rate was unrelated to the software-derived assignment probabilities at high dispersal rates. Assignments were more accurate when the inferred parents were older and immigrants and when dispersal rates between subpopulations were low (1% and 2%). Using 30 instead of 15 loci increased pairwise reliability, but half-sibling assignments were still inaccurate (>59% falsely assigned). The most reliable approach when using inferred pairwise relationships in polygamous species would be not to use half-sibling relationship types. Our simulation approach provides guidance for the application of pedigree inferences under partial sampling and is applicable to other systems where pedigree assignments are used for ecological inference.Empirical mink dataEmpirical field data of culled American mink in NE Scotland (ID, sex, age, year of capture) and their genotyped 15 microsatellitesEmpirical_mink_data.txtRcode Life-history ParametersR codes for the mink life-history parameters used for the simulationsRcode_Dynamics.RGenotypes Scenario 1, Central PopulationSimulation data composed of the genotypes for the initial central population (P0) in Scenario 1S1_P0.txtGenotypes Scenario 1, Peripheral Population 1Simulation data composed of the genotypes for the initial peripheral population 1 (IP0 1) in Scenario 1S1_IP0_1.txtGenotypes Scenario 1, Peripheral Population 2Simulation data composed of the genotypes for the initial peripheral population 2 (IP0 2) in Scenario 1S1_IP0_2.txtGenotypes Scenario 2, Population DeeSimulation data composed of the genotypes for the initial Dee population (P0 Dee) in Scenario 2S2_P0_Dee.txtGenotypes Scenario 2, Population SpeySimulation data composed of the genotypes for the initial Spey population (P0 Spey) in Scenario 2S2_P0_Spey.txtGenotypes Scenario 2, Population TaySimulation data composed of the genotypes for the initial Tay population (P0 Tay) in Scenario 2S2_P0_Tay.txtGenotypes Scenario 3, Population DeeSimulation data composed of the genotypes for the initial Dee population (P0 Dee) in Scenario 3S3_P0_Dee.txtGenotypes Scenario 3, Population SpeySimulation data composed of the genotypes for the initial Spey population (P0 Spey) in Scenario 3S3_P0_Spey.txtGenotypes Scenario 3, Population TaySimulation data composed of the genotypes for the initial Tay population (P0 Tay) in Scenario 3S3_P0_Tay.tx