Comparative feeding behaviour of native and introduced terrestrial snails tracks their ecological impacts

Tedi Hoxha, Steve Crookes, Ian MacIsaac, Xuexiu Chang, Mattias Johansson, Jaimie T.A. Dick, Annegret Nicolai, Hugh J. MacIsaac*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
3 Downloads (Pure)


A developing body of theory and empirical evidence suggest that feeding behaviour as measured by the functional response (FR) can assist researchers in assessing the relative potential, ecological impacts and competitive abilities of native and introduced species. Here, we explored the FRs of two land snails that occur in south-western Ontario, one native (Mesodon thyroidus) and one non-indigenous (Cepaea nemoralis) to Canada. The non-indigenous species appears to have low ecological impact and inferior competitive abilities. Consistent with theory, while both species conformed to Type II functional responses, the native species had a significantly higher attack rate (5.30 vs 0.41, respectively) and slightly lower handling time (0.020 vs 0.023), and hence a higher maximum feeding rate (50.0 vs 43.5). The non-indigenous species exhibited a significantly longer time to contact for a variety of food types, and appeared less discriminating of paper that was offered as a non-food type. The non-indigenous species also ate significantly less food when in mixed species trials with the native snail. These feeding patterns match the known low ecological impact of the introduced snail and are consistent with the view that it is an inferior competitor relative to the native species. However, field experimentation is required to clarify whether the largely microallopatric distributions of the two species in south-western Ontario reflect competitive dominance by the native species or other factors such as habitat preference, feeding preferences or predator avoidance. The relative patterns of feeding behaviour and ecological impact are, however, fully in line with recent functional response theory and application.

Original languageEnglish
Pages (from-to)81-94
Number of pages14
Issue number47
Publication statusPublished - 20 Jun 2019

Bibliographical note

Funding Information:
We thank Muaaz Tariq for assistance with animal husbandry and experimental setup. We appreciate helpful comments from Drs Gregor Kalinkat and Jonathan Jeschke and an anonymous reviewer. TH was supported by NSERC Undergraduate Scholarship, HJM by NSERC Discovery Grant and Canada Research Chair, and XC and HJM by a Joint Grant of Yunnan Provincial Science and Technology Department-Yunnan University Major Project (2018FY001-007).

Publisher Copyright:
© Tedi Hoxha et al.

Copyright 2019 Elsevier B.V., All rights reserved.


  • Alien species
  • Functional response
  • Interspecific competition
  • Non-indigenous species

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science
  • Ecology
  • Animal Science and Zoology
  • Ecological Modelling
  • Plant Science
  • Insect Science

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