Gimme Shelter: differential utilisation and propagule creation of invasive macrophytes by native caddisfly larvae
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ORIGINAL PAPER
Gimme Shelter: differential utilisation and propagule creation of invasive macrophytes by native caddisfly larvae Kate Crane . Ross N. Cuthbert . Anthony Ricciardi . Louise Kregting . Neil E. Coughlan . Hugh J. MacIsaac . Neil Reid . Jaimie T. A. Dick
Received: 27 February 2020 / Accepted: 26 August 2020 Ó The Author(s) 2020
Abstract In aquatic systems, invasive submerged macrophytes considerably alter the structure and functioning of communities, thus potentially compromising ecosystem services. The prolific spread of invasive macrophytes is often aided by vegetative fragment propagation, yet the contributions of various commonly occurring invertebrates to such fragmentation are often unquantified. In the present study, we examine fragmentary spread of invasive macrophytes by a group of shredder-herbivores, larval caddisflies.
Kate Crane and Ross N. Cuthbert have contributed equally to this work.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10530-020-02358-7) contains supplementary material, which is available to authorized users. K. Crane R. N. Cuthbert (&) N. E. Coughlan N. Reid J. T. A. Dick Institute for Global Food Security, School of Biological Sciences, Queen’s University Belfast, 19 Chlorine Gardens, Belfast BT9 5DL, Northern Ireland, UK e-mail: [email protected] K. Crane R. N. Cuthbert L. Kregting N. E. Coughlan N. Reid J. T. A. Dick Queen’s University Marine Laboratory, 12-13 The Strand, Portaferry BT22 1PF, Northern Ireland, UK R. N. Cuthbert GEOMAR Helmholtz-Zentrum fu¨r Ozeanforschung Kiel, 24105 Kiel, Germany
Through novel application of the comparative functional response (FR; resource use as a function of density) approach to the native case-building species Limnephilus lunatus, we compared utilisation of nonnative waterweeds Elodea canadensis and E. nuttallii in mono- and polycultures. Furthermore, we quantified de-cased and cased caddisfly-induced fragment production and length changes among non-native E. canadensis, E. nuttallii, Crassula helmsii and Lagarosiphon major under two different plant orientations: horizontal (floating) versus vertical (upright) growth forms. Larval caddisflies exhibited Type II (hyperbolic) FRs towards both Elodea species, and utilised each plant at similar rates when plants were provided separately. When plant species were presented in combination horizontally, E. canadensis was significantly less utilised compared to E. nuttallii,
A. Ricciardi Redpath Museum, McGill University, 859 Sherbrooke Street West, Montreal, QC H3A 0C4, Canada L. Kregting School of Natural and Built Environment, Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, Northern Ireland, UK N. E. Coughlan School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, Cork, Republic of Ireland
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corroborating observations in the field. De-cased larvae produced new plant fragme
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