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Toad tadpole aggregation behaviour: evidence for a predator avoidance function

Watt1, Nottingham, Young

  • 1Department of Biological Sciences, De Montfort University

Animal Behaviour
|October 1, 1997
PubMed
Summary
This summary is machine-generated.

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Common toad tadpoles (Bufo bufo) aggregate more cohesively when predators are near or with siblings. This aggregation behavior, driven by predator cues and kinship, offers individuals a survival advantage through predator avoidance and dilution effects.

Area of Science:

  • Ethology
  • Behavioral Ecology
  • Amphibian Biology

Background:

  • Tadpole aggregation is a common behavior in anurans.
  • The adaptive significance of tadpole aggregation, particularly in predator avoidance, requires further investigation.

Purpose of the Study:

  • To determine if aggregation behavior in common toad tadpoles (Bufo bufo) serves a predator avoidance function.
  • To investigate the influence of predator chemical cues and kinship on tadpole aggregation.

Main Methods:

  • Two sets of experiments were conducted: 1) monitoring tadpole distribution in artificial pools with and without fish chemical cues, using variance/mean ratio and a swarming index to quantify cohesion. 2) Presenting tadpoles to fish predators in a floating arena to monitor strike rates at varying densities and distributions.

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Main Results:

  • Tadpole groups exhibited higher cohesion in the presence of fish chemical cues and when composed of single sibships.
  • While total predator strike rate per group increased with group size, the strike rate per individual decreased, indicating a dilution effect for individuals within larger aggregations.

Conclusions:

  • Aggregation behavior in common toad tadpoles is influenced by predator presence and kinship, suggesting a role in predator avoidance.
  • Individual tadpoles benefit from larger group sizes due to the dilution effect, though this may not benefit the group as a whole, supporting selfish herd or cooperative group theories.