NDLI: Reproductive tactics and mating contexts affect sperm traits in horseshoe crabs (Limulus polyphemus)

Content Provider	Springer Nature Link
Author	Sasson, Daniel A. Johnson, Sheri L. Brockmann, H. Jane
Copyright Year	2015
Abstract	In systems with male alternative reproductive tactics, discrete behavioral patterns often lead to unequal levels of sperm competition across tactics. In many of these systems, the disadvantaged tactic shows adaptations to sperm traits that increase the competitive ability of its sperm. However, many studies have found that not all sperm traits differ across tactics, and in some systems no sperm trait adaptations are found. Why some systems and some sperm traits display tactic-specific differences and others do not is not always clear. Here, we investigate three sperm traits—ejaculate size, sperm concentration, and sperm velocity—in the American horseshoe crab, Limulus polyphemus, a system where males have condition-dependent reproductive tactics and females influence the amount of sperm competition males face during spawning. Contrary to our predictions that the disadvantaged tactic would show sperm trait adaptations, we found that horseshoe crabs of the tactic that faces the least amount of sperm competition had more concentrated sperm than the males of the other tactics. We propose a number of hypotheses to explain this result and suggest that future studies of alternative reproductive tactics might benefit from considering the role of females in influencing tactic-specific sperm trait adaptations.
Starting Page	1769
Ending Page	1778
Page Count	10
File Format	PDF
ISSN	03405443
Journal	Behavioral Ecology and Sociobiology
Volume Number	69
Issue Number	11
e-ISSN	14320762
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-08-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sperm competition Reproductive tactics Sexual selection Horseshoe crab Limulus Behavioral Sciences Zoology Animal Ecology
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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