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MEPS
Marine Ecology Progress Series

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MEPS 389:127-137 (2009)  -  DOI: https://doi.org/10.3354/meps08157

Larval size in Elysia stylifera is determined by extra-embryonic provisioning but not egg size

Richard M. Allen1,*, Patrick J. Krug2, Dustin J. Marshall1,3

1School of Biological Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia
2Department of Biological Sciences, California State University, Los Angeles, California 90032-8201, USA
3Centre for Marine Studies, The University of Queensland, Brisbane, Queensland 4072, Australia

ABSTRACT: Marine invertebrates that lay egg masses provision their offspring in a variety of ways, and in some groups, egg size is not the sole determinant of offspring size at independence. Supplemental, maternally derived resources, such as extra-embryonic nutrients, may increase offspring size without increasing egg size—options not available to broadcast spawners. Extra-embryonic nutrients, such as nurse eggs, can increase offspring size and performance, but little is known about other forms of larval nutrition. Larvae of the sea slug Elysia stylifera have access to intra- and extra-capsular resources in the egg mass prior to an obligate planktonic feeding period. We investigated the effects of maternal body size on egg size, capsule size, extra-capsular yolk (ECY), and fecundity, and how variance in these traits affected larval size at hatching. Larger mothers produced larger and more eggs, but larval size was unrelated to maternal size, egg size, or fecundity. Larval size instead depended upon the size of the egg capsule and amount of ECY available to each developing embryo: when capsule size was small, increasing ECY per larva increased larval size, and conversely, when ECY per larva was small, increasing capsule size increased larval size. Under theoretical considerations, ECY appears to supplement egg provisioning. Intra-capsular fluid and ECY add to the already diverse set of known mechanisms of offspring provisioning in marine invertebrates, and may provide insight into the factors affecting life-history evolution in marine invertebrates.


KEY WORDS: Offspring size · Egg mass · Egg capsules · Extra-capsular yolk · Maternal effect · Life history · Gastropod · Clutch size


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Cite this article as: Allen RM, Krug PJ, Marshall DJ (2009) Larval size in Elysia stylifera is determined by extra-embryonic provisioning but not egg size. Mar Ecol Prog Ser 389:127-137. https://doi.org/10.3354/meps08157

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