Bivalve or gastropod? Using profitability estimates to predict prey choice by P. clarkii

Gonçalves, Vera Regina Nunes; Gherardi, Francesca; Rebelo, Rui

doi:10.1007/s10211-017-0251-x

Cited by 6 publications

(3 citation statements)

References 63 publications

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“…Both species showed type II responses. This type of response has also been found in red swamp crayfish ( Procambarus clarkii ) feeding on D. polymorpha (Gonçalves, Gherardi, & Rebelo, ). The functional response curve can be influenced by many factors including habitat complexity (Kalinkat, Brose, & Rall, ).…”

Section: Discussionsupporting

confidence: 58%

Section: Functional Responsessupporting

confidence: 63%

“…We could confirm that also spiny‐cheek and marbled crayfish mostly fed on mussels that were smaller than 12 mm. This size class offers the greatest profitability for crayfish (Gonçalves et al, ). Thus, Dreissena mussels can reach a size refuge, and mostly small individuals will be impacted by crayfish predation.…”

Section: Discussionmentioning

confidence: 99%

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Towards a mechanistic understanding of individual‐level functional responses: Invasive crayfish as model organisms

Linzmaier

Jeschke

2019

Freshwater Biology

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In novel communities, a rising number of new and emerging invasive species interact with resident species, some of which are non‐native themselves. We implemented an innovative trophic interaction framework for novel communities and quantified the interaction strength and impact potential of a truly novel species (marbled crayfish Procambarus virginalis) with a resident non‐native counterpart (spiny‐cheek crayfish Faxonius limosus). As prey, we used Dreissena mussels, which are non‐native as well and now hold a key position in many European and North American aquatic ecosystems. For both crayfish species, we predicted functional responses based on a mechanistic model that we parameterised with a set of experimental observations of foraging behaviour and satiation. We compared these predicted functional responses to empirically observed responses. In addition, we incorporated behavioural traits such as aggression, activity, and boldness in the comparisons between the species and individuals to determine their influence on functional responses. We tested individuals from aquarium stocks as well as naturalised individuals from invaded water bodies. Altogether, we performed 1,095 experiments with 26 individual crayfish. We found that per capita predation of spiny‐cheek crayfish exceeded that of marbled crayfish from aquaria and naturalised individuals. Functional responses differed between species and were mostly higher for spiny‐cheek crayfish males. Marbled crayfish, however, were more voracious and reached satiation more slowly. Consumption rates correlated with aggression for marbled crayfish and with an aggressive threat response for spiny‐cheek crayfish. We conclude that spiny‐cheek crayfish can reach higher short‐term consumption rates than marbled crayfish, but both species probably do not substantially affect Dreissena mussel populations in the field. For marbled crayfish, high long‐term consumption, interspecific aggression, and reproduction rates can promote their establishment and spread. Risk assessments of these invaders should be improved by considering numerical responses, and different prey organisms and predators.

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Section: Discussionsupporting

confidence: 58%

Section: Functional Responsessupporting

confidence: 63%