Evol Ecol Res 12: 961-972 (2010) Full PDF if your library subscribes.
Inbreeding depression increases with maternal age in a seed-feeding beetle
Charles W. Fox1 and David H. Reed2
1Department of Entomology, University of Kentucky, Lexington, Kentucky, USA and 2Department of Biology, University of Louisville, Louisville, Kentucky, USA
Correspondence: C.W. Fox, Department of Entomology, University of Kentucky, Lexington, KY 40546-0091, USA.
Background: Interactions between inbreeding and maternal effects have received little attention, and the effect of maternal age on inbreeding depression in offspring has been almost entirely neglected. Maternal age affects allocation of resources and other materials to offspring, which can affect the fitness consequences of inbreeding. An interaction between inbreeding and maternal age thus has the potential to produce complex and long-lasting effects on population dynamics and evolutionary trajectories.
Hypothesis: Inbreeding depression in offspring fitness traits increases with maternal age at reproduction.
Organism: Two populations of the seed-feeding beetle, Callosobruchus maculatus (Coleoptera: Chrysomelidae: Bruchinae).
Methods: We compared the effect of maternal age on egg development/hatch, larval survival, and larval egg-to-adult development time between offspring of sib-mated parents (offspring inbreeding coefficient: F = 0.25; parental F = 0) and offspring of outbred parents (F = 0 for both parents and offspring).
Results: The magnitude of inbreeding depression (proportional reduction in fitness of inbred relative to outbred beetles, δ) increased with maternal age for all measured traits (the proportion of eggs that developed, egg hatch, larval hatch-to-adult survival, and larval egg-to-adult development time). The age effect was large (δ increased by as much as 8% per day of maternal age), although the majority of this increase occurred only in the oldest age classes. There was no difference between the two beetle populations in the magnitude of this inbreeding–maternal age interaction.
Keywords: Callosobruchus, inbreeding depression, inbreeding–age interaction, inbreeding–environment interaction, maternal effects.
DOWNLOAD A FREE, FULL PDF COPY
IF you are connected using the IP of a subscribing institution (library, laboratory, etc.)
or through its VPN.
© 2010 Charles W. Fox. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.
Subscribing institutions/libraries may grant individuals the privilege of making a single copy of an EER article for non-commercial educational or non-commercial research purposes. Subscribing institutions/libraries may also use articles for non-commercial educational purposes by making any number of copies for course packs or course reserve collections. Subscribing institutions/libraries may also loan single copies of articles to non-commercial libraries for educational purposes.
All copies of abstracts and articles must preserve their copyright notice without modification.