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Paratectonatica tigrina (Gastropoda: Naticidae) adjusts its predation tactics depending on the chosen prey and their shell weight relative to its own

Published online by Cambridge University Press:  18 September 2020

Fumio Takeshita*
Affiliation:
Kitakyushu Museum of Natural History and Human History, 2-4-1 Higashida, Yahatahigashi-ku, Kitakyushu, Fukuoka, Japan
Takumi Maekawa
Affiliation:
Osaka Museum of Natural History, 1-23 Nagai Park, Higashi-Sumiyoshi-ku, Osaka, Japan
*
Author for correspondence: Fumio Takeshita, E-mail: takeshita_f@kmnh.jp

Abstract

Paratectonatica tigrina employs three predatory tactics against bivalve prey: wall-drilling, edge-drilling and non-drilling (suffocation) tactics. In this study, we conducted laboratory experiments to examine the predator–prey interactions between the naticid gastropod P. tigrina and two species of bivalve prey, Ruditapes philippinarum and Meretrix lusoria, and to investigate how predatory tactics differ for the bivalve species. Predation success increased with the shell weight ratio between predator and prey, however, there was no significant difference among prey species. The shell weight ratio significantly differed (P < 0.05) between predatory tactics against R. philippinarum, but not against M. lusoria, implying that P. tigrina determines its predatory tactics based on the shell weight ratio for R. philippinarum. However, we observed that feeding duration was not influenced by shell weight ratio or prey species, even though data were separated for each predatory tactic. These results suggest that there is no difference in feeding efficiency based on shell weight ratio between prey species and between predatory tactics. Paratectonatica tigrina may alter its predatory tactics suitably depending on the prey species and the relative size difference, despite the same feeding efficiency.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2020

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