Figure S1. Map of the region where dolphins were capturedoff the coast of Japan in the Pacific Ocean.

Figure S2. Relatedness of captured group members.

Vertical and horizontal axes show the number of paired combinations and the relatedness index r, respectively. Thecurve shows the relatedness value frequencies for 13,530combinations of 165 individuals. Arrows show the combination andrelated dolphin numbers at the r index values of 0.19 (3.0% of all possible combinations), 0.25 (0.9%), 0.28 (0.6%), 0.32 (0.4%), 0.38 (0.3%), and 0.45 (0.2%).

Figure S3. Relatedness consensus tree. The numbers on thebranches indicate the number of times (bootstraps) the speciespartitioned into the two sets out of 100 trees. The P valuesare maximum likelihoods determined by hypothesis testing of Kinshipr index values using the Kingroup v2 program ( Relatedness tree was constructed using the protocol of Timothy Frasier's Rel-A-Tree program (

Table S1. Biological information for 180 bottlenosedolphins.

Table S2. Microsatellite markers used in this study andcomparison between allele numbers found in the present study andreported in other studies.

Table S3. Basic information of mtDNA haplotypes used forphylogenetic analysis.

Table S4. Genetic information for 165 postnatal dolphinsand 15 fetuses.

Table S5. Allele frequency (AF) of 20 microsatellitemarkers and mtDNA D-loop region genotypes for a population of 165postnatal dolphins.

Table S6. Statistical results for the genetic analyses of20MS markers.

Table S7. Genetic evidence for parentage testing of 165postnatal dolphins and 15 fetuses in Table S3.

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