Abstract
The outcomes of recent fights can provide individuals information about their relative fighting ability and affect their contest decisions (winner–loser effects). Most studies investigate the presence/absence of the effects in populations/species, but here we examine how they vary between individuals of a species in response to age-dependent growth rate. Many animals’ fighting ability is highly dependent on body size, so rapid growth makes information from previous fights unreliable. Furthermore, fast-growing individuals are often at earlier developmental stages and are relatively smaller and weaker than most other individuals but are growing larger and stronger quickly. We therefore predicted winner-loser effects to be less detectable in individuals with high than low growth rates and to decay more quickly. Fast-growing individuals should also display stronger winner than loser effects, because a victory when small indicates a strength which will grow, whereas a loss might soon become irrelevant. We tested these predictions using naïve individuals of a mangrove killifish, Kryptolebias marmoratus, in different growth stages. Measures of contest intensity revealed winner/loser effects only for slow-growth individuals. Both fast- and slow-growth fish with a winning experience won more of the subsequent non-escalated contests than those with a losing experience; in fast-growth individuals this effect disappeared in 3 days, but in slow-growth fish it did not. Fast-growth individuals also displayed winner effects but not loser effects. The fish therefore responded to their contest experiences in a way which reflected value of the information from these experiences to them, consistent with our predictions.
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We thank Alan Watson for help with comments and on the manuscript.
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This research was supported by the Ministry of Science and Technology, R.O.C. (MOST 110-2621-B003-001-MY3).
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C-Y. L, C-Y.P and Y.H. wrote the main manuscript text and Y.H. prepared figures 1-2. All authors reviewed the manuscript.
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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. The Animal Care and Use Committee of National Taiwan Normal University approved K. marmoratus as the study organism and the procedures for the use of the fish (permit # 109033).
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Li, CY., Pan, CY. & Hsu, Y. Age-dependent winner–loser effects in a mangrove rivulus fish, Kryptolebias marmoratus. Anim Cogn 26, 1477–1488 (2023). https://doi.org/10.1007/s10071-023-01797-8
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DOI: https://doi.org/10.1007/s10071-023-01797-8