Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

The effects of pastoral intensification on the feeding interactions of generalist predators in streams

Pearson, C. E., Symondson, W. O. C. ORCID: https://orcid.org/0000-0002-3343-4679, Clare, E. L., Ormerod, S. J. ORCID: https://orcid.org/0000-0002-8174-302X, Iparraguirre Bolaños, E. and Vaughan, I. P. ORCID: https://orcid.org/0000-0002-7263-3822 2018. The effects of pastoral intensification on the feeding interactions of generalist predators in streams. Molecular Ecology 27 (2) , pp. 590-602. 10.1111/mec.14459

[thumbnail of Pearson_et_al-2017-Molecular_Ecology.pdf]
Preview
PDF - Published Version
Available under License Creative Commons Attribution.

Download (606kB) | Preview

Abstract

Land-use change can alter trophic interactions with wide-ranging functional consequences, yet the consequences for aquatic food webs have been little studied. In part, this may reflect the challenges of resolving the diets of aquatic organisms using classical gut contents analysis, especially for soft-bodied prey. We used next-generation sequencing to resolve prey use in nearly 400 individuals of two predatory invertebrates (the Caddisfly, Rhyacophila dorsalis, and the Stonefly Dinocras cephalotes) in streams draining land with increasingly intensive livestock farming. Rhyacophila dorsalis occurred in all streams, whereas D. cephalotes was restricted to low intensities, allowing us to test whether: (i) apparent sensitivity to agriculture in the latter species reflects a more specialized diet and (ii) diet in R. dorsalis varied between sites with and without D. cephalotes. DNA was extracted from dissected gut contents, amplified without blocking probes and sequenced using Ion Torrent technology. Both predators were generalists, consuming 30 prey taxa with a preference for taxa that were abundant in all streams or that increased with intensification. Where both predators were present, their diets were nearly identical, and R. dorsalis's diet was virtually unchanged in the absence of D. cephalotes. The loss of D. cephalotes from more intensive sites was probably due to physicochemical stressors, such as sedimentation, rather than to dietary specialization, although wider biotic factors (e.g., competition with other predatory taxa) could not be excluded. This study provides a uniquely detailed description of predator diets along a land-use intensity gradient, offering new insights into how anthropogenic stressors affect stream communities

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Additional Information: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Publisher: Wiley
ISSN: 0962-1083
Funders: Biotechnology and Biological Sciences Research Council
Date of First Compliant Deposit: 4 December 2017
Date of Acceptance: 8 November 2017
Last Modified: 03 May 2023 20:21
URI: https://orca.cardiff.ac.uk/id/eprint/107228

Citation Data

Cited 4 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics