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Sex-specific territorial behaviour in the Banggai cardinalfish, Pterapogon kauderni
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 Ecology and Evolution, Animal Ecology.
2004 (English)In: Environmental Biology of Fishes, ISSN 0378-1909, E-ISSN 1573-5133, Vol. 70, no 4, 375-379 p.Article in journal (Refereed) Published
Abstract [en]

In a field experiment, we studied how levels of aggression in males and females in established pairs of the Banggai cardinalfish were influenced by the sex of an experimentally introduced individual larger and more attractive than its resident counterpart. Contrary to previous studies on other cardinalfish species, and contrary to expectations in a sex role reversed species, the male was the main aggressor towards an intruder. Moreover, residents were more aggressive towards an intruder of the same sex as themselves. Furthermore, even though females often courted introduced, larger males, no intruder managed to take over the partnership of any resident. We suggest that our findings imply relatively equal sex roles in the Banggai cardinalfish and we discuss the evolution of sex specific territory defence and its significance in the Banggai cardinalfish as well as the implications of such behaviour in the interpretations of sex roles in general.

Place, publisher, year, edition, pages
2004. Vol. 70, no 4, 375-379 p.
Keyword [en]
territorial defence, sex, sex roles
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-90789DOI: 10.1023/B:EBFI.0000035430.76766.53ISI: 000222800800009OAI: oai:DiVA.org:uu-90789DiVA: diva2:163263
Available from: 2003-09-04 Created: 2003-09-04 Last updated: 2017-12-14Bibliographically 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, NiclasBerglund, Anders

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