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Females produce larger eggs for large males in a paternal mouthbrooding fish
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Animal Ecology.ORCID iD: 0000-0001-5791-336X
2001 (English)In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 268, no 1482, 2229-2234 p.Article in journal (Refereed) Published
Abstract [en]

When individuals receive different returns from their reproductive investment dependent on mate quality, they are expected to invest more when breeding with higher quality mates. A number of studies over the past decade have shown that females may alter their reproductive effort depending on the quality/attractiveness of their mate. However, to date, despite extensive work on parental investment, such a differential allocation has not been demonstrated in fish. Indeed, so far only two studies from any taxon have suggested that females alter the quality of individual offspring according to the quality/attractiveness of their mate. The banggai cardinal fish is an obligate paternal mouth brooder where females lay few large eggs. It has previously been shown that male size determines clutch weight irrespective of female size in this species. In this study, I investigated whether females perform more courtship displays towards larger males and whether females allocate their reproductive effort depending on the size of their mate by experimentally assigning females to either large or small males. I found that females displayed more towards larger males, thereby suggesting a female preference for larger males. Further, females produced heavier eggs and heavier clutches but not more eggs when paired with large males. My experiments show that females in this species adjust their offspring weight and, thus, presumably offspring quality according to the size of their mate.

Place, publisher, year, edition, pages
2001. Vol. 268, no 1482, 2229-2234 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-90786DOI: 10.1098/rspb.2001.1792OAI: oai:DiVA.org:uu-90786DiVA: diva2:163260
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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