Volume 45, Issue 7 pp. 1628-1640
Article
Free Access

COMPARATIVE POPULATION GENETIC STRUCTURE OF A PARASITE (FASCIOLOIDES MAGNA) AND ITS DEFINITIVE HOST

M. Mulvey

M. Mulvey

Savannah River Ecology Laboratory, University of Georgia, Drawer E, Aiken, SC, 29802 USA

And Biology Department, Wake Forest University, Winston-Salem, NC 27109 USA;Search for more papers by this author
J. M. Aho

J. M. Aho

Savannah River Ecology Laboratory, University of Georgia, Drawer E, Aiken, SC, 29802 USA

And Biology Department, Wake Forest University, Winston-Salem, NC 27109 USA;Search for more papers by this author
C. Lydeard

C. Lydeard

Savannah River Ecology Laboratory, University of Georgia, Drawer E, Aiken, SC, 29802 USA

And Department of Zoology and Wildlife Science, Auburn University, Auburn, AL 36849 USA;Search for more papers by this author
P. L. Leberg

P. L. Leberg

Savannah River Ecology Laboratory, University of Georgia, Drawer E, Aiken, SC, 29802 USA

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M. H. Smith

M. H. Smith

Savannah River Ecology Laboratory, University of Georgia, Drawer E, Aiken, SC, 29802 USA

And Departments of Zoology and Genetics, School of Forest Resources and Institute of Ecology, University of Georgia, Athens, GA 30602 USA.Search for more papers by this author
First published: November 1991
Citations: 36

Abstract

The population genetic structure of the American liver fluke, Fascioloides magna, and its definitive host the white-tailed deer, Odocoileus virginianus, was examined in South Carolina. Flukes were significantly more common in deer from river-swamp habitat than upland areas and prevalence increased with host age. The distribution of flukes among deer occurred as a negative binomial with the mean dispersion parameter, k, equal to 0.17 and the range from 0.10 to 1.11 within local areas. Significant spatial genetic differentiation was observed for flukes and deer. Patterns of genetic distance in flukes were not concordant with those of the definitive host nor were they related to geographic distance between sample locations. Spatial genetic differentiation among flukes reflected the tendency for individual hosts to harbor multiple individuals from a limited number of parasite clones. The large population size of the parasite and movements of the definitive host tend to counteract factors that lead to spatial differentiation.

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