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Sequential Differentiation of Sexual Behavior in Populations of Drosophila silvestris

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Title:Sequential Differentiation of Sexual Behavior in Populations of Drosophila silvestris
Authors:Kaneshiro, Kenneth Y.
Sato Kurihara, Joyce
Date Issued:Jul 1981
Publisher:University of Hawai'i Press
Citation:Kaneshiro KY and Sato Kurihara J. 1981. Sequential differentiation of sexual behavior in populations of Drosophila silvestris. Pac Sci 35(3): 177-183.
Abstract:Laboratory strains from six widely distributed populations of
Drosophila silvestris from the island of Hawaii were established. Mate preference
experiments were conducted to determine whether behavioral differences were
present among the six populations. In nearly all pairwise combinations studied,
at least partial (asymmetrical) isolation was observed between reciprocal
crosses; i.e., females from one population were less discriminant than females
from the other. Kaneshiro (1976, 1980) has hypothesized that the genetic basis
of certain elements of the courtship behavior pattern in these species change
(are lost) such that females of ancestral populations discriminate strongly
against males of derived populations, while females of derived populations
readily accept males of ancestral populations. Following such an hypothesis,
the data obtained from this study provide a basis for inferring the direction of
evolution among the six populations of silvestris. It would appear that the
population on Hualalai is the oldest population, and from there, two separate
lineages gave rise to the remaining five populations. One lineage provided
progenitors for the south and west populations, i.e., at Pauahi and Kahuku.
The second lineage involved an introduction from Hualalai to the Kohala
Mountains and subsequent colonizations of the Piihonua and Olaa populations.
When interpreted in this way, the behavioral studies appear to be a sensitive
indicator of initial stages of the speciation process.
Appears in Collections: Pacific Science Volume 35, Number 3, 1981

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