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Differential investment in the Banggai cardinalfish: can females adjust egg size close to egg maturation to match the attractiveness of a new partner?
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Animal Ecology.ORCID iD: 0000-0001-5791-336X
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Limnology.
2003 (English)In: Journal of Fish Biology, ISSN 0022-1112, E-ISSN 1095-8649, Vol. 63, no S1, 144-151 p.Article in journal (Refereed) Published
Abstract [en]

To test whether females can change their egg investment according to the different attractiveness ( i.e. size as measured by standard length, Ls) of a new mate after eggs have already matured in response to an earlier mate, female Banggai cardinalfish Pterapogon kauderni were first allowed to produce eggs for small (unattractive) or large (attractive) males. Then, when spawning was initiated, but prior to actual spawning, their partner was switched to either a significantly larger or a significantly smaller partner, respectively. A strong positive correlation between egg size and days until spawning with the second male was found for the females initially paired to a small and then a large male. Within a few days, these females apparently increased their egg size to match the attractiveness of their new male. No correlation between days until spawning and egg size in females initially paired to a large and then a small male, however was found, so apparently females were unable to adjust egg size in response to a decrease in mate attractiveness. Consequently, it is suggested that females can increase their egg size investment even after the onset of egg maturation and that this change can be quite rapid.

Place, publisher, year, edition, pages
2003. Vol. 63, no S1, 144-151 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-90787DOI: 10.1111/j.1095-8649.2003.00205.xOAI: oai:DiVA.org:uu-90787DiVA: diva2:163261
Available from: 2003-09-04 Created: 2003-09-04 Last updated: 2014-09-26Bibliographically approved
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, Niclas

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