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Contrasting trophic-cascade effects driven by variation in morphology of the perches used by a larval damselfly

Qinghua Zhao, YinG Pan, John Griffin Orcid Logo, Junzhao Sun, Shucun Sun

Freshwater Biology, Volume: 61, Issue: 5, Pages: 693 - 701

Swansea University Author: John Griffin Orcid Logo

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DOI (Published version): 10.1111/fwb.12739

Abstract

1. The presence of habitat structures (e.g. caves, ledges, branches) has well-documented ecologicaleffects. However, it remains largely unknown how variation in the morphology of particular habitatstructures affects ecological interactions.2. Using an algae–cladoceran grazer–larval damselfly food ch...

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Published in: Freshwater Biology
ISSN: 00465070
Published: 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa31869
first_indexed 2017-02-06T20:49:38Z
last_indexed 2019-08-09T15:36:57Z
id cronfa31869
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spelling 2019-08-05T14:20:39.5335708 v2 31869 2017-02-06 Contrasting trophic-cascade effects driven by variation in morphology of the perches used by a larval damselfly 9814fbffa76dd9c9a207166354cd0b2f 0000-0003-3295-6480 John Griffin John Griffin true false 2017-02-06 BGPS 1. The presence of habitat structures (e.g. caves, ledges, branches) has well-documented ecologicaleffects. However, it remains largely unknown how variation in the morphology of particular habitatstructures affects ecological interactions.2. Using an algae–cladoceran grazer–larval damselfly food chain as a model in a series of microcosmexperiments, we manipulated food-chain length and the length (long versus short) and diameter(thick versus thin) of vertically orientated damselfly perches (habitat structure) and examined thedensity of the grazers and algae. Because the larval damselflies are usually more flexible on thinnerperches and have broader foraging domains on longer perches, we predicted that when on long andthin perches they would suppress grazer density more efficiently and hence confer a more positivetrophic-cascade effect on algal growth.3. As predicted, larval damselflies occupying long and thin perches most strongly reduced grazerdensity and increased algal density, illustrating a positive trophic cascade. In all other damselflytreatments, and despite reduced grazer density, algal density declined, showing a negative trophiccascade due to an elevation in grazer foraging efficiency under predation risk. This probably resultedfrom the increased activity of the grazers and their spatial shift to the lower water column wherealgal density was higher.4. In conclusion, perch morphology affected the direction and strength of the trophic cascade byaltering both density-mediated and behaviour-mediated indirect interactions. Considering thatanthropogenic disturbance is dramatically changing the morphological diversity of habitat structures,we call for more research into the ecological consequences of such physical diversity at communityand ecosystem levels. Journal Article Freshwater Biology 61 5 693 701 00465070 algae–cladoceran–damselfly, habitat structures, morphology, species interaction, trophic cascade 4 4 2016 2016-04-04 10.1111/fwb.12739 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University 2019-08-05T14:20:39.5335708 2017-02-06T12:59:07.6116437 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Qinghua Zhao 1 YinG Pan 2 John Griffin 0000-0003-3295-6480 3 Junzhao Sun 4 Shucun Sun 5
title Contrasting trophic-cascade effects driven by variation in morphology of the perches used by a larval damselfly
spellingShingle Contrasting trophic-cascade effects driven by variation in morphology of the perches used by a larval damselfly
John Griffin
title_short Contrasting trophic-cascade effects driven by variation in morphology of the perches used by a larval damselfly
title_full Contrasting trophic-cascade effects driven by variation in morphology of the perches used by a larval damselfly
title_fullStr Contrasting trophic-cascade effects driven by variation in morphology of the perches used by a larval damselfly
title_full_unstemmed Contrasting trophic-cascade effects driven by variation in morphology of the perches used by a larval damselfly
title_sort Contrasting trophic-cascade effects driven by variation in morphology of the perches used by a larval damselfly
author_id_str_mv 9814fbffa76dd9c9a207166354cd0b2f
author_id_fullname_str_mv 9814fbffa76dd9c9a207166354cd0b2f_***_John Griffin
author John Griffin
author2 Qinghua Zhao
YinG Pan
John Griffin
Junzhao Sun
Shucun Sun
format Journal article
container_title Freshwater Biology
container_volume 61
container_issue 5
container_start_page 693
publishDate 2016
institution Swansea University
issn 00465070
doi_str_mv 10.1111/fwb.12739
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 1. The presence of habitat structures (e.g. caves, ledges, branches) has well-documented ecologicaleffects. However, it remains largely unknown how variation in the morphology of particular habitatstructures affects ecological interactions.2. Using an algae–cladoceran grazer–larval damselfly food chain as a model in a series of microcosmexperiments, we manipulated food-chain length and the length (long versus short) and diameter(thick versus thin) of vertically orientated damselfly perches (habitat structure) and examined thedensity of the grazers and algae. Because the larval damselflies are usually more flexible on thinnerperches and have broader foraging domains on longer perches, we predicted that when on long andthin perches they would suppress grazer density more efficiently and hence confer a more positivetrophic-cascade effect on algal growth.3. As predicted, larval damselflies occupying long and thin perches most strongly reduced grazerdensity and increased algal density, illustrating a positive trophic cascade. In all other damselflytreatments, and despite reduced grazer density, algal density declined, showing a negative trophiccascade due to an elevation in grazer foraging efficiency under predation risk. This probably resultedfrom the increased activity of the grazers and their spatial shift to the lower water column wherealgal density was higher.4. In conclusion, perch morphology affected the direction and strength of the trophic cascade byaltering both density-mediated and behaviour-mediated indirect interactions. Considering thatanthropogenic disturbance is dramatically changing the morphological diversity of habitat structures,we call for more research into the ecological consequences of such physical diversity at communityand ecosystem levels.
published_date 2016-04-04T13:07:16Z
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score 11.047935

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