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Do egg size and parental care coevolve in fish?
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Animal Ecology.ORCID iD: 0000-0001-5791-336X
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Animal Ecology.
2005 (English)In: Journal of Fish Biology, ISSN 0022-1112, E-ISSN 1095-8649, Vol. 66, no 6, 1499-1515 p.Article in journal (Refereed) Published
Abstract [en]

A phenomenon that has attracted a substantial theoretical and empirical interest is the positive relationship between egg size and the extent of parental care in fishes. Interestingly, despite the effort put into solving the causality behind this relationship over the past two decades it remains largely unsolved. Moreover, how general the positive relationship between egg size and parental care is among fishes is also poorly understood. In order to stimulate research exploring egg size and parental care variation in fishes, the potential selective forces from both natural and sexual selection on egg size and parental care are discussed. Recent empirical findings on how oxygen requirements and developmental times may differ between differently sized eggs are incorporated into a critical view of the current theory of this field. Furthermore, it is suggested that the up to now neglected effects of sexual selection, through both mate choice and sexual conflict, can have strong effects on the relationship between egg size and parental care in fishes. In light of the recent developments of comparative and experimental methods, future approaches that may improve the understanding of the relationship between egg size and care in fishes are suggested.

Place, publisher, year, edition, pages
2005. Vol. 66, no 6, 1499-1515 p.
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-90791DOI: 10.1111/j.0022-1112.2005.00777.xOAI: oai:DiVA.org:uu-90791DiVA: diva2:163265
Available from: 2003-09-04 Created: 2003-09-04 Last updated: 2017-12-14
In thesis
1. Influence of Mate Quality on Reproductive Decisions in a Fish with Paternal Care
Open this publication in new window or tab >>Influence of Mate Quality on Reproductive Decisions in a Fish with Paternal Care
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Female reproductive decisions have been suggested to be highly influenced by mate quality. I have studied whether offspring quality may be adjusted by females to match the attractiveness of males and how strong control females have over their reproductive investment focusing on egg size. This was done in the Banggai cardinalfish (Pterapogon kauderni), a sex-role reversed obligate paternal mouthbrooder where males invest heavily into reproduction. As this species is suitable for both laboratory experiments and field studies it is an ideal candidate for the study of reproductive investment.

Mating was size-assortative and both males and females benefited from pairing with large partners. However, male size determined the reproductive output of a pair. Females courted large males more intensively and produced larger, but not fewer eggs when mated to large males as compared to small males. Further, this matching of egg size to mate attractiveness may be fast. Female courtship behaviours contained honest information regarding both clutch weight and egg maturity, traits that may be highly important for male mate choice. Surprisingly, males played an important part in territory defence suggesting relatively equal sex-roles in this species. Also, this species showed stable group structures which may be important for the evolution of female plasticity in reproductive investment due to high variance in quality of available mates.

This thesis suggest that females have a remarkable control over their reproductive investments and that male quality may be highly influential on reproductive decisions regarding offspring quality. Furthermore, it suggest that sexual selection may have strong effects on the evolution of egg size and parental care on a whole.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 33 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 882
Keyword
Ecology, sexual selection, differential allocation, evolution of egg size and parental care, Ekologi
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-3562 (URN)91-554-5723-1 (ISBN)
Public defence
2003-09-26, Ekman salen, Uppsala, 10:00
Opponent
Supervisors
Available from: 2003-09-04 Created: 2003-09-04 Last updated: 2014-09-26Bibliographically approved

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Kolm, NiclasAhnesjö, Ingrid

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