How effective are maternal effects at having effects?

Proceedings. Biological Sciences
Andrew P BeckermanNils Koesters

Abstract

The well studied trade-off between offspring size and offspring number assumes that offspring fitness increases with increasing per-offspring investment. Where mothers differ genetically or exhibit plastic variation in reproductive effort, there can be variation in per capita investment in offspring, and via this trade-off, variation in fecundity. Variation in per capita investment will affect juvenile performance directly--a classical maternal effect--while variation in fecundity will also affect offspring performance by altering the offsprings' competitive environment. The importance of this trade-off, while a focus of evolutionary research, is not often considered in discussions about population dynamics. Here, we use a factorial experiment to determine what proportion of variation in offspring performance can be ascribed to maternal effects and what proportion to the competitive environment linked to the size-number trade-off. Our results suggest that classical maternal effects are significant, but that in our system, the competitive environment, which is linked to maternal environments by fecundity, can be a far more substantial influence.

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Citations

Sep 17, 2008·Molecular & Cellular Proteomics : MCP·Angel P DizDavid O F Skibinski
Sep 11, 2008·Proceedings. Biological Sciences·Eirik Mack EilertsenIvar Folstad
Jul 8, 2011·Proceedings. Biological Sciences·Lucy GilbertJefferson A Graves
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Jul 29, 2019·Journal of Nematology·Chang LiuPatricia Timper

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