Evol Ecol Res 10: 867-892 (2008) Full PDF if your library subscribes.
Dioecy as a specialization promoting sperm delivery
Priya Iyer and Joan Roughgarden
Department of Biological Sciences, Stanford University, Stanford, California, USA
Correspondence: P. Iyer, Department of Biological Sciences, Stanford University, Herrin 424 Serra Mall, Stanford, CA 94305, USA.
Question: Is dioecy primitive to metazoans? When should hermaphrodism or dioecy be selected?
Data description: Classification of animal phyla as hermaphroditic/dioecious, broadcast spawning/localized fertilizing.
Analysis method: Ancestral trait reconstruction using the maximum parsimony method.
Hypothesis: Specialization to dioecy is selected when males are more effective than hermaphrodites in concentrating sperm.
Mathematical method: Population genetic model to derive ESS conditions for hermaphrodism and dioecy.
Assumptions: Trade-off between resources available for gamete production and sperm concentrating capability.
Conclusions: Dioecy evolves from hermaphrodism when increasing sperm concentration is adaptive, even though total resources available for sperm and egg production decrease.
Keywords: broadcast spawning, dioecy, evolution of sexes, fertilization behaviour, hermaphrodism, internal fertilization.
DOWNLOAD A FREE, FULL PDF COPY
IF you are connected using the IP of a subscribing institution (library, laboratory, etc.)
or through its VPN.
© 2008 Priya Iyer. 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.