Published online by Cambridge University Press: 10 August 2009
CHAPTER SUMMARY
Many mating systems are characterized by male alternative life histories that utilize different mating tactics to reproduce. Bourgeois males attempt to monopolize mating access to females, and in fish, many of these males provide sole parental care to the developing young. Parasitic males use behavior patterns such as sneaking to steal fertilizations from bourgeois males. Modeling has shown that when bourgeois males provide higher genetic benefits – i.e., alleles leading to increased condition and higher fitness of their offspring – than parasitic males, females maximize both indirect and direct (parental care) benefits by mating exclusively with bourgeois males. However, when parasitic males have higher genetic benefits than bourgeois males, females must trade off genetic quality of their offspring with reduced parental care. Here I develop a model to examine such trade-offs and show that as the relative genetic benefits of parasitic versus bourgeois males increase or as the fitness benefit of parental care decreases, females maximize their fitness by having a greater proportion of their offspring sired by parasitic males. The optimal breeding situation, which maximizes individual fitness, differs for females, parasitic males, and bourgeois males and this should lead to sexual conflict. I test the model with data from bluegill sunfish (Lepomis macrochirus), where parasitic males may provide greater genetic benefits to females than bourgeois males. I show that high-quality females, as measured by three phenotypic measures, spawn in nests that have higher bourgeois male paternity and their offspring subsequently receive greater parental care.
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.