Figure 1 . Sampling and genetic analyses. (A) Map of sampled
locations around Yap Island. In the rest of the figure and in the main
text names of locations are abbreviated with their initial letters. (B,
C) Examples of sampled adult (B) and juvenile (C) colonies. (D) Initial
hierarchical clustering of all samples based on identity-by-state (IBS),
to detect clones and wrong collections. (E) Ordination plot of the first
two principal coordinates of the identity-by-state matrix (filtered
dataset). Age classes are identified by indices “A” (adults) and “J”
(juveniles) added to the abbreviation of reef site. Ellipses show 75%
confidence limits of the data (multivariate normal distribution model).
None of the population:age groups are significantly different from any
others. Crosses identify positions of the two Nimpal siblings. (F)
Deviation of nucleotide diversity (\(\pi\)) from global mean in adults
and juveniles from each reef site, computed separately for each
chromosome (red lines). The X-axis labels identify age class and give
the number of genotyped individuals within each group. (G) Hierarchical
clustering tree of the filtered data (same as on panel E) based on
relatedness. Insets show site frequency spectra of the detected siblings
(“Sib pair”) and two randomly chosen individuals (“Random pair”).