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Predation at a snail's pace: what's time to a gastropod?
Christofer H Boggs1, James A Rice1, Jennifer A Kitchell2
1Department of Zoology, University of Wisconsin, 53706, Madison, WI, USA.
Oecologia
|March 18, 2017
Summary
Predatory snails (Polinices duplicatus) ate thin-shelled clams faster, increasing energy intake. However, they did not learn to prefer this easier prey, indicating fixed feeding behaviors.
Area of Science:
- Marine Biology
- Behavioral Ecology
- Predator-Prey Dynamics
Background:
- Naticid gastropods, like Polinices duplicatus, are marine predators that consume bivalves.
- Predator foraging strategies often involve maximizing energy intake while minimizing costs.
- Understanding prey choice and handling time is crucial for predator-prey interaction studies.
Purpose of the Study:
- To investigate the foraging efficiency of Polinices duplicatus when presented with varying prey shell thickness.
- To determine if Polinices duplicatus exhibits adaptive learning in prey selection based on energetic benefits.
- To assess the role of handling time in the predatory behavior of naticid gastropods.
Main Methods:
- Experimental manipulation of Mercenaria mercenaria shell thickness to create 'thin-shelled' and 'normal' prey types.
- Quantification of predation rates and handling times for Polinices duplicatus feeding on both prey types.
- Analysis of energy intake rates and time allocation in relation to prey characteristics.
Main Results:
- Polinices duplicatus exhibited significantly faster predation rates on artificially thinned-shelled Mercenaria mercenaria compared to normal shells.
- Handling time was identified as a key limiting factor in the rate of energy intake.
- The time saved by preying on thin-shelled prey was reallocated to foraging activities, demonstrating the value of time.
- Despite the energetic advantages, Polinices duplicatus did not show a learned preference for the novel, thin-shelled prey.
Conclusions:
- Predatory efficiency in Polinices duplicatus is influenced by prey handling time, with thinner shells offering a clear energetic advantage.
- The observed lack of learned preference for superior prey suggests that predator prey choices in this species are largely stereotyped and evolutionarily determined.
- Cost-benefit models incorporating time and energy are suitable for predicting dietary efficiency and prey selection in naticid gastropods.