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Multichannel feeding by spider functional groups is driven by feeding strategies and resource availability

Matthew Perkins, Richard Inger, Stuart Bearhop, Dirk Sanders

Oikos, Volume: 127, Issue: 1, Pages: 23 - 33

Swansea University Author: Matthew Perkins

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DOI (Published version): 10.1111/oik.04500

Abstract

Multichannel feeding, whereby consumers feed across resource channels such as upon herbivore and detritivore resources, acts to link discrete compartments of a food web with implications for ecosystem functioning and stability. Currently however, we have little understanding which feeding strategies...

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Published in: Oikos
ISSN: 00301299
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa44820
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first_indexed 2018-10-09T19:37:34Z
last_indexed 2018-10-23T13:23:10Z
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spelling 2018-10-23T10:54:02.2306591 v2 44820 2018-10-09 Multichannel feeding by spider functional groups is driven by feeding strategies and resource availability 228a9ab1324cbc8f7a0db0043a6f0a0a Matthew Perkins Matthew Perkins true false 2018-10-09 SBI Multichannel feeding, whereby consumers feed across resource channels such as upon herbivore and detritivore resources, acts to link discrete compartments of a food web with implications for ecosystem functioning and stability. Currently however, we have little understanding which feeding strategies of consumers underlie multichannel feeding. We therefore link spider functional group and resource density-dependent or density-independent feeding strategies to multichannel feeding by quantifying not only consumer diet, but also the relative availability of resources. Here we analysed herbivore (green) and detritivore (brown) prey use by spider communities in grasslands, and tested if available prey biomass proportions were linked to observed spider dietary proportions.Differentspider functional groups each linked green and brown resource channels, but while green prey were always consumed in proportion to their relative biomass, brown prey were consumed independently of proportion by some functional groups. Additionally, we found greater intraguild predation by cursorial spiders when green resources were relatively scarcer, suggesting green prey was preferred, and needed to be compensated for when rare. Overall, we observed a stronger consumer connection to the green than brown resource channel, yet this green connection was more variable due to greater range in green resource availability across grasslands and density-dependent consumption on green prey. Consequently, multichannel feeding by spiders was determined by density-dependent and density-independent feeding strategies thatvaried by spider functional group and across resources channels. Our results demonstrate that the role of multichannel feeding by spiders in linking separate food web compartments is a dynamic component of food web structure in these wild grasslands. Journal Article Oikos 127 1 23 33 00301299 31 1 2018 2018-01-31 10.1111/oik.04500 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2018-10-23T10:54:02.2306591 2018-10-09T16:10:51.8072229 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Matthew Perkins 1 Richard Inger 2 Stuart Bearhop 3 Dirk Sanders 4
title Multichannel feeding by spider functional groups is driven by feeding strategies and resource availability
spellingShingle Multichannel feeding by spider functional groups is driven by feeding strategies and resource availability
Matthew Perkins
title_short Multichannel feeding by spider functional groups is driven by feeding strategies and resource availability
title_full Multichannel feeding by spider functional groups is driven by feeding strategies and resource availability
title_fullStr Multichannel feeding by spider functional groups is driven by feeding strategies and resource availability
title_full_unstemmed Multichannel feeding by spider functional groups is driven by feeding strategies and resource availability
title_sort Multichannel feeding by spider functional groups is driven by feeding strategies and resource availability
author_id_str_mv 228a9ab1324cbc8f7a0db0043a6f0a0a
author_id_fullname_str_mv 228a9ab1324cbc8f7a0db0043a6f0a0a_***_Matthew Perkins
author Matthew Perkins
author2 Matthew Perkins
Richard Inger
Stuart Bearhop
Dirk Sanders
format Journal article
container_title Oikos
container_volume 127
container_issue 1
container_start_page 23
publishDate 2018
institution Swansea University
issn 00301299
doi_str_mv 10.1111/oik.04500
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 0
active_str 0
description Multichannel feeding, whereby consumers feed across resource channels such as upon herbivore and detritivore resources, acts to link discrete compartments of a food web with implications for ecosystem functioning and stability. Currently however, we have little understanding which feeding strategies of consumers underlie multichannel feeding. We therefore link spider functional group and resource density-dependent or density-independent feeding strategies to multichannel feeding by quantifying not only consumer diet, but also the relative availability of resources. Here we analysed herbivore (green) and detritivore (brown) prey use by spider communities in grasslands, and tested if available prey biomass proportions were linked to observed spider dietary proportions.Differentspider functional groups each linked green and brown resource channels, but while green prey were always consumed in proportion to their relative biomass, brown prey were consumed independently of proportion by some functional groups. Additionally, we found greater intraguild predation by cursorial spiders when green resources were relatively scarcer, suggesting green prey was preferred, and needed to be compensated for when rare. Overall, we observed a stronger consumer connection to the green than brown resource channel, yet this green connection was more variable due to greater range in green resource availability across grasslands and density-dependent consumption on green prey. Consequently, multichannel feeding by spiders was determined by density-dependent and density-independent feeding strategies thatvaried by spider functional group and across resources channels. Our results demonstrate that the role of multichannel feeding by spiders in linking separate food web compartments is a dynamic component of food web structure in these wild grasslands.
published_date 2018-01-31T03:56:15Z
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score 11.016235

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