Evol Ecol Res 5: 19-28 (2003) Full PDF if your library subscribes.
The relationship between offspring size and performance in the wolf spider Hogna helluo (Araneae: Lycosidae)
S.E. Walker,1* A.L. Rypstra2 and S.D. Marshall1‡
1Department of Zoology, Miami University, Oxford, OH 45056, and 2Department of Zoology, Miami University, 1601 Peck Boulevard, Hamilton, OH 45011, USA
Address all correspondence to Sean E. Walker, Department of Biological Sciences, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada.
Life-history theory predicts a trade-off between number of offspring and investment (size) per offspring. An important component of this trade-off is how offspring size influences performance and survival. In this study, we examined the relationships between maternal size, offspring size and clutch size, as well as the relationship between offspring size and performance, in the wolf spider, Hogna helluo. Offspring dispersing from field-collected female Hogna helluo with egg sacs were counted and their carapace width was measured. The relationships between feeding performance (number of prey captured), starvation tolerance and offspring size were examined to determine if offspring size was correlated with offspring performance. Clutch size increased with female size, but there was little evidence for a trade-off between offspring size and number. Starvation tolerance and feeding performance were positively related to offspring size. Our results show that offspring performance increases with offspring size and are consistent with the hypothesis that parental fitness is maximized by producing as many offspring as possible given constraints on a minimum viable offspring size.
Keywords: life history, optimality, resource allocation, size–number trade-off.
DOWNLOAD A FREE, FULL PDF COPY
IF you are connected using the IP of a subscribing institution (library, laboratory, etc.)
or through its VPN.
© 2003 Sean E. Walker. 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.