Top-down control of prey increases with drying disturbance in ponds: a consequence of non-consumptive interactions?

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dc.citation.epage607en_US
dc.citation.issue1en_US
dc.citation.spage598en_US
dc.citation.volume82en_US
dc.contributor.authorGreig, Hamish S.
dc.contributor.authorWissinger, Scott A.
dc.contributor.authorMcIntosh, Angus R.
dc.contributor.avlauthorWissinger, Scott A.
dc.contributor.departmentBiologyen_US
dc.date.accessioned2018-01-29T19:50:49Z
dc.date.available2018-01-29T19:50:49Z
dc.date.issued2013
dc.description.abstract1. Biotic interactions are often expected to decrease in intensity as abiotic conditions become more stressful to organisms. However, in many cases, food-web and habitat complexity also change with abiotic stress or disturbance, potentially altering patterns of species interactions across environmental gradients. 2. We used a combination of field assays and mesocosm experiments to investigate how disturbance from desiccation moderates top-down control of prey by predators across a gradient of pond duration in New Zealand. 3. Field manipulations of predator abundance in ponds led to an unexpected decrease in the top-down control of prey biomass by predatory invertebrates as pond duration increased (decreasing abiotic stress). Predatory fish, which are restricted to permanent ponds, had negligible effects on prey biomass. Mesocosm experiments further indicated the consumptive effects of fish are weak; a result that cannot be explained by an increase in physical habitat refugia in relatively more permanent ponds. 4. Manipulations of invertebrate predator diversity in mesocosms (both substitutive and additive treatments), and the addition of olfactory fish cues, revealed that strong non-consumptive effects of fish reduced predation by predatory invertebrates, and these effects overwhelmed the positive influence of invertebrate predator diversity on prey consumption. 5. These results suggest that decreases in top-down control with increasing pond permanence are likely a result of non-consumptive effects of fish weakening predation by invertebrate predators in the more complex food webs of permanent ponds. Therefore, considering nonconsumptive effects of predators in complex food webs will likely improve the understanding of biotic interactions across environmental gradients.en_US
dc.description.versionPublished articleen_US
dc.identifier.citationGreig, H.S., S.A Wissinger, and A.R. McIntosh. 2013. Top-down control of prey increases with drying disturbance in ponds: a consequence of non-consumptive interactions? Journal of Animal Ecology 82:598-607. doi 10.1111/1365-2656.12042en_US
dc.identifier.doi10.1111/1365-2656.12042
dc.identifier.issn0021-8790
dc.identifier.issne1365-2656
dc.identifier.urihttp://hdl.handle.net/10456/45572
dc.language.isoen_USen_US
dc.publisherBritish Ecological Societyen_US
dc.relation.ispartofJournal of Animal Ecologyen_US
dc.relation.isversionofhttp://doi.org/10.1111/1365-2656.12042en_US
dc.rightsThis article was selected and published in the Journal of Animal Ecology © 2013 Greig, Wissinger, and McIntosh. All rights reserved.en_US
dc.subjectFood-web complexityen_US
dc.subjectinteraction modificationen_US
dc.subjectintraspecific competitionen_US
dc.subjectmultiple predator effectsen_US
dc.subjectpond permanenceen_US
dc.subjectrisk reductionen_US
dc.subjecttrait-mediated interactionsen_US
dc.titleTop-down control of prey increases with drying disturbance in ponds: a consequence of non-consumptive interactions?en_US
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