Effect of insect-mediated dispersal on the genetic structure of postglacial water mite populations

A J Bohonak


Assaying population structure in species that differ in dispersal ability can help to determine whether population differentiation is dependent on the movement of individuals between populations. Here, allozyme variation is analysed in over 1100 individuals from nine species and two species complexes of Arrenurus water mites collected throughout north-eastern North America. As larvae, eight taxa are obligate parasites of winged adult insects that provide the primary opportunity for dispersal. Three additional species have lost the ability to parasitize insects and do not disperse in this manner. Consistent with the glaciated history of the region, very low allozyme heterozygosity was found in these taxa (Ho = 0.00-0.12), near panmixia in five out of seven species for which population differentiation was calculated and no patterns of isolation by distance over spatial scales up to several hundred kilometres. Nonetheless, in two out of three comparisons between sister species with and without parasitic larvae, parasitism was significantly associated with higher heterozygosity. Population differentiation could also be contrasted for two of these sister species pairs; in each case, lower estimates of FST were found in the mites abl...Continue Reading


Aug 1, 1972·Journal of Medical Entomology·M Jalil, R Mitchell
May 24, 1994·Proceedings of the National Academy of Sciences of the United States of America·R S Burton, B N Lee
Mar 19, 1999·The Quarterly Review of Biology·A J Bohonak
May 1, 1998·Trends in Ecology & Evolution·J L Bossart, D Pashley Prowell
Mar 1, 1967·Evolution; International Journal of Organic Evolution·Rodger Mitchell
Apr 1, 1995·Evolution; International Journal of Organic Evolution·Beate Nürnberger, Richard G Harrison
Mar 1, 1987·Evolution; International Journal of Organic Evolution·Robin S Waples

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