Interspecific variation in ejaculate allocation and associated effects on female fitness in seed beetles

Journal of Evolutionary Biology
Johanna RönnGöran Arnqvist

Abstract

When ejaculates are costly to produce, males are expected to allocate their ejaculate resources over successive matings in a manner that optimizes their reproductive success and this may have important consequences for their mates. In seed beetles (Coleoptera; Bruchidae), ejaculates vary in size across species from weighing less than 1%, up to as much as 8%, of male body weight. Ejaculates contain not only sperm but also a range of additional substances and females in some species gain benefits from receiving large ejaculates. Male ejaculate allocation may thus affect female fitness. Here, we first characterized the pattern of male ejaculate allocation over successive matings in seven-seed beetle species. We then assessed how this allocation affected female fitness in each species. Although females generally benefited from receiving large ejaculates, the interspecific variation observed both in ejaculate allocation patterns and in their effects on female fitness was remarkably large considering that the species studied are closely related. Our analyses suggest that variation in ejaculate composition is the key, both within and across species. We discuss possible causes for this variation and conclude that coevolution between ma...Continue Reading

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Citations

Sep 4, 2014·Die Naturwissenschaften·Philippe LouâpreJoan van Baaren
Nov 10, 2015·Journal of Evolutionary Biology·Elina ImmonenGöran Arnqvist
Oct 4, 2008·Journal of Insect Physiology·Takashi YamaneYoshinobu Kimura
Sep 13, 2014·Evolution; International Journal of Organic Evolution·David BergerAlexei A Maklakov
Jul 3, 2013·Evolution; International Journal of Organic Evolution·Karoline Fritzsche, Göran Arnqvis
Jul 22, 2010·Journal of Evolutionary Biology·C FrickeG Arnqvist
Feb 24, 2009·Current Biology : CB·Cosima Hotzy, Göran Arnqvist
Oct 30, 2012·Current Biology : CB·Cosima HotzyGöran Arnqvist
Dec 13, 2019·PloS One·Dariusz Krzysztof MałekMarcin Czarnoleski
Apr 10, 2019·Proceedings. Biological Sciences·Samuel J LymberyLeigh W Simmons
Apr 10, 2017·Genome Biology and Evolution·Elina ImmonenGöran Arnqvist
Feb 6, 2021·Scientific Reports·Caitlin E McDonough-GoldsteinSteve Dorus
Jul 8, 2021·Proceedings. Biological Sciences·Göran ArnqvistLocke Rowe

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