DOI: 10.5061/dryad.sp17k
title: Data from: Large-scale introduction of the Indo-Pacific damselfish Abudefduf viagiensis into Hawai‘i promotes genetic swamping of the endemic congener A. abdominalis

description: Hybridization in the ocean was once considered rare, a process prohibited
 by the rapid evolution of intrinsic reproductive barriers in a
 high-dispersal medium. However, recent genetic surveys have prompted a
 reappraisal of marine hybridization as an important demographic and
 evolutionary process. The Hawaiian Archipelago offers an unusual case
 history in this arena, due to the recent arrival of the widely distributed
 Indo-Pacific Sergeant (Abudefduf vaigiensis), which is hybridizing with
 the endemic congener, A. abdominals. Surveys of mtDNA and three nuclear
 loci across Hawai'i (N = 396, A. abdominalis and N = 314, A.
 vaigiensis) reveal that hybridization is significantly higher in the
 human-perturbed southeast archipelago (19.8%), tapering off to 5.9% in the
 pristine northwest archipelago. While densities of the two species varied
 throughout Hawai'i, hybridization was highest in regions with similar
 species densities, contradicting the generalization that the rarity of one
 species promotes interspecific mating. Our finding of later generation
 hybrids throughout the archipelago invokes the possibility of genetic
 swamping of the endemic species. An exaptation, an adaptation with
 unintended consequences, may explain these findings: the endemic species
 has transient yellow coloration during reproduction, whereas the
 introduced species has yellow coloration continuously as adults, in effect
 a permanent signal of reproductive receptivity. Haplotype diversity is
 higher in Hawaiian A. vaigiensis than in our samples from the native
 range, indicating large-scale colonization almost certainly facilitated by
 the historically recent surge of marine debris. In this chain of events,
 marine debris promotes colonization, exaptation promotes hybridization,
 and introgression invokes the possible collapse of an endemic species.
description: Aab_cytbCytochrome b (cyt b), Abudefduf abdominalisAab_GnRHGonadotropin-releasing hormone (GnRH), intron 3 of Abudefdeuf abdominalis found in Hawaii, USAAab_Gpd2Glyceraldehyde-3-phosphate dehydrogenase (Gpd2), intron 2 of Abudefduf abdominalis found in Hawaii, USAAab_S7S7 ribosomal protein gene, intron 1; Abudefduf abdominalis found in Hawaii, USAAva_cytbCytochrome b (cyt b), Abudefduf vaigiensis found in Hawaii, USA.Ava_GnRHGonadotropin-releasing hormone (GnRH), intron 3 of Abudefdeuf vaigiensis found in Hawaii, USA.Ava_Gpd2Glyceraldehyde-3-phosphate dehydrogenase (Gpd2), intron 2 of Abudefduf vaigiensis found in Hawaii, USAAva_S7S7 ribosomal protein gene, intron 1; Abudefduf vaigiensis found in Hawaii, USA.Coleman_etal_Abudefduf_09.25.14.supplExcel file (‘Coleman_etal_Abudefduf_09.25.14.suppl.xlsx) with all other supplementary materials in the following sheets: 1 – Abudefduf abdominalis sample ID and corresponding collection location; 2 – A. vaigiensis sample ID and corresponding collection location; 3 – Table S1; 4 – Table S2; 5 – Figure S1; 6 – Figure S2; 7 – Figure S3; 8 – Abudefduf Population Density – Hawaii.Abudefduf_NEWHYBRIDSInput file for NEWHYBRIDS (Abudefduf spp.)Abudefduf_STRUCTUREInput file for STRUCTURE (Abudefduf spp.)