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Male Stickleback Fish Masquerading In Murky Waters

Date:
July 22, 2007
Source:
University of Chicago Press Journals
Summary:
Where humans lower water quality, poor quality stickleback male fish trick unsuspecting females. An increase in nutrient input in the Baltic is compromising water clarity by promoting algal blooms. Under reduced visibility caused by the presence of algae, poor quality males are able to lie about their physical condition, which is bad for the females. Poor quality males are more likely to eat the eggs that they're supposed to be tending.

Where humans lower water quality, poor quality stickleback male fish trick unsuspecting females.

Finding a decent, honest mate is challenging enough without the added problem of reduced visibility caused by human-induced changes to the aquatic environment. Yet this is precisely the sort of dilemma female stickleback fish are facing in the Baltic Sea, according to a recent study published in the August issue of the American Naturalist by Dr. Bob Wong, an Australian researcher from Monash University, and his Scandinavian colleagues, Dr. Ulrika Candolin from the University of Uppsala and Dr. Kai Linstrom from the Εbo Akademi in Finland.

An increase in nutrient input in the Baltic is compromising water clarity by promoting algal blooms. Dr. Wong and his colleagues were interested in finding out whether this, in turn, might lead to a break down in the honesty of sexual displays used by male sticklebacks to attract females. They did so by examining the courtship effort of good and poor condition males in the absence and presence of a rival male in both clear sea water and water rendered turbid by algae.

"Under reduced visibility caused by the presence of algae, poor quality males are able to lie about their physical condition to unsuspecting females by displaying at a higher rate without the risk of attracting the wrath of rival males," says Dr. Wong. "Since poor condition males are also more likely to eat the eggs that they're suppose to be tending, this is bad news for females who rely on the honesty of male sexual displays to select mates with superior parental qualities."

Reference: Bob B. M. Wong, Ulrika Candolin, and Kai Lindstrφm, "Environmental deterioration compromises socially enforced signals of male quality in three-spined sticklebacks" The American Naturalist (2007), volume 170:184--189 DOI: 10.1086/519398


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The above story is based on materials provided by University of Chicago Press Journals. Note: Materials may be edited for content and length.


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University of Chicago Press Journals. "Male Stickleback Fish Masquerading In Murky Waters." ScienceDaily. ScienceDaily, 22 July 2007. <www.sciencedaily.com/releases/2007/07/070719093326.htm>.
University of Chicago Press Journals. (2007, July 22). Male Stickleback Fish Masquerading In Murky Waters. ScienceDaily. Retrieved October 21, 2014 from www.sciencedaily.com/releases/2007/07/070719093326.htm
University of Chicago Press Journals. "Male Stickleback Fish Masquerading In Murky Waters." ScienceDaily. www.sciencedaily.com/releases/2007/07/070719093326.htm (accessed October 21, 2014).

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