Parental Roles and the Amount of Care in a Bi-Parental Substrate Brooding Cichlid: The Effect of Size Differences within Pairs

Parental roles and the amount of care in bi-parental fish have been assumed to be determined by sex. We studied the parental behaviour in a substrate brooding cichlid Julidochromis ornatus (40-90 mm in total length) in which parents participate in care of eggs and young. In the study population, ca ...80% of paired females were larger than their partners and pairs mated assortatively for size. Males spent more time their offspring in female-largest pairs, whereas the opposite was found for male-largest pairs. These differences in the amount of care were more conspicuous when differences in body size were greater, whereas similar sized pairs shared parental tasks. These results suggest that the amount of parental care is largely affected by the relative size within pairs independent of sex in J. ornatus. However, the frequencies of defensive behaviours were not different in both female-largest and male-largest pairs. This indicates that parental roles would not completely change as the change of the body size difference within pairs. The larger parents were socially dominant over the partners regardless of sex, and observations of aggressive behaviours within pairs suggest that the larger fish are likely to make the partners perform parental care. Higher frequencies of aggressive enc Ausführliche Beschreibung Beschreibung ausblenden

Quelle:	in Behaviour Vol. 141, No. 9 (2004), p. 1135-1149 Weitere Artikel
Format:	Online-Artikel
Sprache:	English
Veröffentlicht:	2004
Beschreibung:	Online-Ressource
Schlagworte:	research-article Parental care Sexual conflict Body size Size-assortative mating Substrate-brooding cichlid Julidochromis ornatus
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