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Title: Genetic evidence for the origin and relationships of Hawaiian honeycreepers (Aves: Fringillidae)

Author: Johnson, Ned K.; Marten, Jill A.; Ralph, C. John;

Date: 1989

Source: The Condor 91(2):319-396

Publication Series: Miscellaneous Publication

Description: Using starch gel electrophoresis of proteins, we examined variation at 36 genetic loci in nine species (eight genera) of Hawaiian honeycreepers (Class Aves; Family Fringillidae; Subfamily Drepanidinae). Two species of cardueline finches and two emberizids served as outgroup taxa. Twenty-three loci (64%) were either polymorphic within taxa and/or were fixed at alternative alleles among taxa. In seven of nine species, low levels of mean Hobs (0.015), percentage of polymorphic loci (4.16), and average number of alleles per polymorphic locus (2.03) may reflect population bottlenecks that occurred either during or after initial colonization. Phenograms, distance Wagner trees, F-M trees, and a cladistic analysis provided hypotheses for the evolutionary relationships of taxa and suggest that: (1) The drepanidines are monophyletic. (2) The Hawaiian honeycreepers are more similar genetically to the two species of emberizids than to the two species of carduelines, a result that conflicts with a recent consensus of opinion based on morphologic and other biochemical data. (3) The species ancestral to modem drepanidines colonized the Hawaiian Archipelago at an estimated 7-8 million years before present (MYBP). This date agrees generally with the timing of emergence of Nihoa, now largely submerged, but antedates the appearance of Kauai (5 MYBP), the oldest of the present "high" Hawaiian Islands. (4) The creepers Oreomystis and Paroreomyza represent the oldest and most divergent lineage of living drepanidines. (5) The youngest lineages are represented by the nectar feeders (Himatione and Vestiaria), the thick-billed "finch types" (Loxioides and Telespiza), and a diverse array of other forms (Loxops and Hemignathus). (6) Hemignathus "virens" stejnegeri is a full species, possibly allied to Loxops coccineus. Our genetic data conflict with the two major phylogenetic hypotheses that have been proposed for the radiation of the drepanidines: (1) origin from tubular-tongued, nectar-feeding ancestors; and (2) origin from thick-billed and thick-tongued, seed- and fruit-eating ancestors. Instead, the evidence suggests that the earliest Hawaiian honeycreepers had generalized bills, tongues, and diets. This ancestral group gave rise to the lineages that eventually led to both (1) modern Paroreomyza and Oreomystis and (2) a complex group of (a) nectar feeders (Himatione, Vestiaria, and relatives); (b) seed and fruit eaters (Loxioides, Telespiza, and relatives); and (c) a diverse group of species that feed on both arthropods and nectar (Loxops, Hemignathus, and relatives). We speculate that the most immediate ancestor of all of the heavy-billed species was a thin-billed, tubular-tongued, nectarivorous form and that this major morphologic shift was expedited by the alteration of developmental patterns and rates.

Keywords: Hawaiian honeycreepers, Drepanidinae, allozymes, insular colonization, phylogenetic inference

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Johnson, Ned K.; Marten, Jill A.; Ralph, C. John 1989. Genetic evidence for the origin and relationships of Hawaiian honeycreepers (Aves: Fringillidae). The Condor 91(2):319-396


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