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<p><i>Daphnia</i> are well known for their ability to protect themselves against various predators by developing inducible morphological, behavioural and life history defences. The influence of body size as a life history trait on behavioural defences has rarely been investigated, although it may be a decisive trait for the evolution of defensive strategies. Therefore, we investigated the behavioural reaction of the relatively small species <i>D.&#xa0;barbata</i> and the two relatively large species <i>D.&#xa0;longicephala</i> and <i>D.&#xa0;magna</i> in response to the heteropteran backswimmer <i>Notonecta</i> (ambush predator) and the tadpole shrimp <i>Triops</i> (cruising predator). We hypothesised that apart from prey body size, especially the predator hunting strategy (ambush vs. cruising) is relevant for the evolved defensive strategies. We found that the small <i>D.&#xa0;barbata</i> reacted with distinct behavioural alterations in depth selection, swimming velocity and swarming behaviour to <i>Triops</i> and <i>Notonecta</i>, while the large <i>D.&#xa0;longicephala</i> adjusted only swimming velocity and depth selection. Large <i>D.&#xa0;magna</i> did not respond behaviourally at all. Moreover, daphniids seemed to react more strongly to <i>Notonecta</i> than to <i>Triops</i>. Based on these observations, we describe a potential pattern explaining the interplay between body size, predator hunting type and resulting behavioural response, which may be validated in further species.</p>

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Inducible defence strategies against ambush and cruising predators: interplay and distinction of body size, morphology and behaviour in three Daphnia species

  • 期刊论文

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  • 发表日期：

    2025年12月2日

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  • Martin Horstmann,
  • Johanna Knupfer,
  • Linda C. Weiss,
  • Ralph Tollrian

摘要

Daphnia are well known for their ability to protect themselves against various predators by developing inducible morphological, behavioural and life history defences. The influence of body size as a life history trait on behavioural defences has rarely been investigated, although it may be a decisive trait for the evolution of defensive strategies. Therefore, we investigated the behavioural reaction of the relatively small species D. barbata and the two relatively large species D. longicephala and D. magna in response to the heteropteran backswimmer Notonecta (ambush predator) and the tadpole shrimp Triops (cruising predator). We hypothesised that apart from prey body size, especially the predator hunting strategy (ambush vs. cruising) is relevant for the evolved defensive strategies. We found that the small D. barbata reacted with distinct behavioural alterations in depth selection, swimming velocity and swarming behaviour to Triops and Notonecta, while the large D. longicephala adjusted only swimming velocity and depth selection. Large D. magna did not respond behaviourally at all. Moreover, daphniids seemed to react more strongly to Notonecta than to Triops. Based on these observations, we describe a potential pattern explaining the interplay between body size, predator hunting type and resulting behavioural response, which may be validated in further species.