DO ODOCOILEUS VIRGINIANUS MALES PRODUCE Y-CHROMOSOME-BIASED EJACULATES? IMPLICATIONS FOR ADAPTIVE SEX RATIO THEORIES

Autor:	Robert A. Gonzales, Lisa I. Muller, G.R. Welch, Stephen Demarais, H. David Guthrie, Terry J. Engelken, Randy W. DeYoung
Rok vydání:	2004
Předmět:	Genetics Ecology Reproductive success biology Offspring Captivity Semen Odocoileus Y chromosome biology.organism_classification Animal Science and Zoology Ecology Evolution Behavior and Systematics Sex allocation Sex ratio Nature and Landscape Conservation Demography
Zdroj:	Journal of Mammalogy. 85:768-773
ISSN:	1545-1542 0022-2372
Popis:	The theory of adaptive sex ratio variation assumes that parents can increase their fitness by investing in the offspring sex that will gain the greatest lifetime reproductive success. Many adaptive sex ratio hypotheses imply or predict a female-mediated physiological mechanism that facilitates parental control. However, the ability of females to control offspring sex ratio could be significantly affected if males provided X- or Y-chromosomebiased ejaculates, as was recently discovered in domestic artiodactyls. To determine whether this occurs in whitetailed deer (Odocoileus virginianus), we examined semen sex ratio of captive deer using DNA fluorescence flow cytometry. We also used microsatellite markers to assign paternity of fawns sired in previous years to determine if temporal patterns existed in fawn sex relative to conception date. The ratio of X- and Y-sperm did not differ from an expected 1:1 among deer or between collection periods. Median conception dates of male and female fawns sired in previous years were similar, and there were no apparent temporal trends in offspring sex. We find no evidence that skewed ejaculates occur in white-tailed deer.
Databáze:	OpenAIRE
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