Size, more than colour, drives dyadic interactions in sub-adults of a colour polymorphic cichlid
Lehtonen, Topi K.; Nagarajan-Radha, Venkatesh; Dowling, Damian K.; Wong, Bob Bm (2022-03-14)
Topi K Lehtonen, Venkatesh Nagarajan-Radha, Damian K Dowling, Bob Bm Wong, Size, more than colour, drives dyadic interactions in sub-adults of a colour polymorphic cichlid, Biological Journal of the Linnean Society, Volume 136, Issue 1, May 2022, Pages 111–119, https://doi.org/10.1093/biolinnean/blac014
© 2022 The Linnean Society of London. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe2022092259842
Tiivistelmä
Abstract
Social and aggressive behaviours often affect the fitness of multiple interacting individuals simultaneously. Here, we assessed dyadic interactions in a colour-polymorphic cichlid fish, the red devil, Amphilophus labiatus. We found that sub-adult red devil pairs of smaller body size interacted more, and were more aggressive towards each other, than pairs comprising larger individuals. Interactions did not significantly differ between colour morphs, i.e. between dark, gold and heterotypic pairs. Interestingly, within a broad range of parameters, an automated measure of time that the two fish spent in close proximity was an accurate proxy for their level of aggression, as measured by an observer from video recordings. These results show that, between sub-adult red devils, (aggressive) interactions significantly depend on body size, but not colour morph, of the interacting individuals. In addition, the results support the use of automated data-gathering approaches as an appropriate tool for studies of aggression.
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