NDLI: Functional nonequivalence of sperm in Drosophila pseudoobscura.

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Functional nonequivalence of sperm in Drosophila pseudoobscura.

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Functional nonequivalence of sperm in Drosophila pseudoobscura.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Karr, T. L. Snook, R. R. Markow, T. A.
Description	Author Affiliation: Snook RR ( Department of Zoology, Arizona State University, Tempe 85287-1501.);
Abstract	We report on a form of sperm polymorphism, termed polymegaly, that occurs in species of the Drosophila obscura group. Individual males of species in this group characteristically produce more than one discrete length of nucleated, motile sperm. Hypotheses suggested to explain the evolutionary significance of sperm polymorphism have been either nonadaptive or adaptive, with the latter focusing on sperm competition or nutrient provisioning. These hypotheses assume all sperm types fertilize eggs; however, no data have been gathered to test this assumption. We found that two size classes of sperm are produced and transferred to females in approximately equal numbers by the male; only long sperm persist in significant numbers in female sperm storage organs. Furthermore, we used a DNA-specific dye (bisbenzimide) and sperm-specific antibodies to ask if both sperm types fertilize eggs in Drosophila pseudoobscura. Confocal microscopy and immunofluorescent analyses of fertilized eggs using anti-sperm polyclonal antisera demonstrated that only long sperm participate in fertilization. These data falsify those hypotheses in which all sperm types are assumed to be functionally equivalent (fertilize eggs). Any remaining or new hypotheses for the evolutionary significance of polymegaly must incorporate these findings. Several new areas of research are suggested.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	23
Volume Number	91
Language	English
Publisher	National Academy of Sciences
Publisher Date	1994-12-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Drosophila Anatomy & Histology Spermatozoa Ultrastructure Animals Biological Evolution Cell Size Physiology Fertilization Sexual Behavior, Animal Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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