Additive multiple predator effects of two specialist paradiaptomid copepods towards larval mosquitoes

Ross N. Cuthbert; Tatenda Dalu; Ryan J. Wasserman; Olaf L.F. Weyl; P. William Froneman; Amanda Callaghan; Jaimie T.A. Dick

doi:10.1016/j.limno.2019.125727

Additive multiple predator effects of two specialist paradiaptomid copepods towards larval mosquitoes

Ross N. Cuthbert^*, Tatenda Dalu, Ryan J. Wasserman, Olaf L.F. Weyl, P. William Froneman, Amanda Callaghan, Jaimie T.A. Dick

^*Corresponding author for this work

School of Biological Sciences

Research output: Contribution to journal › Article › peer-review

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Abstract

Interactions between multiple predators can profoundly affect prey risk, with implications for prey population stability and ecosystem functioning. In austral temporary wetlands, arid-area adapted specialist copepods are key predators for much of the hydroperiod. Limited autoecological information relating to species interactions negates understandings of trophic dynamics in these systems. In the present study, we examined multiple predator effects of two key predatory paradiaptomid copepods which often coexist in austral temporary wetlands, Lovenula raynerae Suárez-Morales, Wasserman and Dalu 2015 and Paradiaptomus lamellatus Sars, 1985. Predation rates towards larval mosquito prey across different water depths were quantified. Using a comparative functional response approach, individual L. raynerae exhibited significantly higher feeding rates than P. lamellatus, characterised by higher attack rates, shorter handling times and higher maximum feeding rates. Increasing water depth tended to negatively affect prey consumption, particularly for L. raynerae. Interspecific multiple predator consumption combined additively, and thus prey risks were well-predicted from consumption rates by individual paradiaptomid copepod species, irrespective of water depth. Our results suggest that increasing copepod predator diversity in austral temporary wetland ecosystems additively heightens prey risk across different water volumes, and may help to regulate disease vector mosquito populations. Therefore, the numerical extent, phenology and diversity of predator hatching events during the hydroperiod may substantially mediate interaction strengths in these ecosystems.

Original language	English
Article number	125727
Number of pages	6
Journal	Limnologica
Volume	79
DOIs	https://doi.org/10.1016/j.limno.2019.125727
Publication status	Published - 11 Nov 2019

Bibliographical note

Funding Information:
This study was funded by the Department for the Economy, Northern Ireland . We extend gratitude to Rhodes University for the provision of laboratory facilities. We acknowledge use of infrastructure and equipment provided by the South African Institute for Aquatic Biodiversity (SAIAB) Research Platform and the funding channelled through the National Research Foundation – SAIAB Institutional Support system. This study was partly funded by the National Research Foundation – South African Research Chairs Initiative of the Department of Science and Technology (Inland Fisheries and Freshwater Ecology , Grant No. 110507 ). TD is supported by the National Research Foundation Thuthuka Grant (No. 117700 ).

Publisher Copyright:
© 2019 Elsevier GmbH

Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.

Keywords

Functional response
Larval mosquitoes
Predator-predator interaction
Temporary wetland
Water depth
Zooplankton

ASJC Scopus subject areas

Aquatic Science

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Additive multiple predator effects of two specialist paradiaptomid copepods towards larval mosquitoes
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Cite this

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title = "Additive multiple predator effects of two specialist paradiaptomid copepods towards larval mosquitoes",

abstract = "Interactions between multiple predators can profoundly affect prey risk, with implications for prey population stability and ecosystem functioning. In austral temporary wetlands, arid-area adapted specialist copepods are key predators for much of the hydroperiod. Limited autoecological information relating to species interactions negates understandings of trophic dynamics in these systems. In the present study, we examined multiple predator effects of two key predatory paradiaptomid copepods which often coexist in austral temporary wetlands, Lovenula raynerae Su{\'a}rez-Morales, Wasserman and Dalu 2015 and Paradiaptomus lamellatus Sars, 1985. Predation rates towards larval mosquito prey across different water depths were quantified. Using a comparative functional response approach, individual L. raynerae exhibited significantly higher feeding rates than P. lamellatus, characterised by higher attack rates, shorter handling times and higher maximum feeding rates. Increasing water depth tended to negatively affect prey consumption, particularly for L. raynerae. Interspecific multiple predator consumption combined additively, and thus prey risks were well-predicted from consumption rates by individual paradiaptomid copepod species, irrespective of water depth. Our results suggest that increasing copepod predator diversity in austral temporary wetland ecosystems additively heightens prey risk across different water volumes, and may help to regulate disease vector mosquito populations. Therefore, the numerical extent, phenology and diversity of predator hatching events during the hydroperiod may substantially mediate interaction strengths in these ecosystems.",

keywords = "Functional response, Larval mosquitoes, Predator-predator interaction, Temporary wetland, Water depth, Zooplankton",

author = "Cuthbert, {Ross N.} and Tatenda Dalu and Wasserman, {Ryan J.} and Weyl, {Olaf L.F.} and Froneman, {P. William} and Amanda Callaghan and Dick, {Jaimie T.A.}",

note = "Funding Information: This study was funded by the Department for the Economy, Northern Ireland . We extend gratitude to Rhodes University for the provision of laboratory facilities. We acknowledge use of infrastructure and equipment provided by the South African Institute for Aquatic Biodiversity (SAIAB) Research Platform and the funding channelled through the National Research Foundation – SAIAB Institutional Support system. This study was partly funded by the National Research Foundation – South African Research Chairs Initiative of the Department of Science and Technology (Inland Fisheries and Freshwater Ecology , Grant No. 110507 ). TD is supported by the National Research Foundation Thuthuka Grant (No. 117700 ). Publisher Copyright: {\textcopyright} 2019 Elsevier GmbH Copyright: Copyright 2019 Elsevier B.V., All rights reserved.",

year = "2019",

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doi = "10.1016/j.limno.2019.125727",

language = "English",

volume = "79",

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AU - Cuthbert, Ross N.

AU - Dalu, Tatenda

AU - Wasserman, Ryan J.

AU - Weyl, Olaf L.F.

AU - Froneman, P. William

AU - Callaghan, Amanda

AU - Dick, Jaimie T.A.

N1 - Funding Information: This study was funded by the Department for the Economy, Northern Ireland . We extend gratitude to Rhodes University for the provision of laboratory facilities. We acknowledge use of infrastructure and equipment provided by the South African Institute for Aquatic Biodiversity (SAIAB) Research Platform and the funding channelled through the National Research Foundation – SAIAB Institutional Support system. This study was partly funded by the National Research Foundation – South African Research Chairs Initiative of the Department of Science and Technology (Inland Fisheries and Freshwater Ecology , Grant No. 110507 ). TD is supported by the National Research Foundation Thuthuka Grant (No. 117700 ). Publisher Copyright: © 2019 Elsevier GmbH Copyright: Copyright 2019 Elsevier B.V., All rights reserved.

PY - 2019/11/11

Y1 - 2019/11/11

N2 - Interactions between multiple predators can profoundly affect prey risk, with implications for prey population stability and ecosystem functioning. In austral temporary wetlands, arid-area adapted specialist copepods are key predators for much of the hydroperiod. Limited autoecological information relating to species interactions negates understandings of trophic dynamics in these systems. In the present study, we examined multiple predator effects of two key predatory paradiaptomid copepods which often coexist in austral temporary wetlands, Lovenula raynerae Suárez-Morales, Wasserman and Dalu 2015 and Paradiaptomus lamellatus Sars, 1985. Predation rates towards larval mosquito prey across different water depths were quantified. Using a comparative functional response approach, individual L. raynerae exhibited significantly higher feeding rates than P. lamellatus, characterised by higher attack rates, shorter handling times and higher maximum feeding rates. Increasing water depth tended to negatively affect prey consumption, particularly for L. raynerae. Interspecific multiple predator consumption combined additively, and thus prey risks were well-predicted from consumption rates by individual paradiaptomid copepod species, irrespective of water depth. Our results suggest that increasing copepod predator diversity in austral temporary wetland ecosystems additively heightens prey risk across different water volumes, and may help to regulate disease vector mosquito populations. Therefore, the numerical extent, phenology and diversity of predator hatching events during the hydroperiod may substantially mediate interaction strengths in these ecosystems.

AB - Interactions between multiple predators can profoundly affect prey risk, with implications for prey population stability and ecosystem functioning. In austral temporary wetlands, arid-area adapted specialist copepods are key predators for much of the hydroperiod. Limited autoecological information relating to species interactions negates understandings of trophic dynamics in these systems. In the present study, we examined multiple predator effects of two key predatory paradiaptomid copepods which often coexist in austral temporary wetlands, Lovenula raynerae Suárez-Morales, Wasserman and Dalu 2015 and Paradiaptomus lamellatus Sars, 1985. Predation rates towards larval mosquito prey across different water depths were quantified. Using a comparative functional response approach, individual L. raynerae exhibited significantly higher feeding rates than P. lamellatus, characterised by higher attack rates, shorter handling times and higher maximum feeding rates. Increasing water depth tended to negatively affect prey consumption, particularly for L. raynerae. Interspecific multiple predator consumption combined additively, and thus prey risks were well-predicted from consumption rates by individual paradiaptomid copepod species, irrespective of water depth. Our results suggest that increasing copepod predator diversity in austral temporary wetland ecosystems additively heightens prey risk across different water volumes, and may help to regulate disease vector mosquito populations. Therefore, the numerical extent, phenology and diversity of predator hatching events during the hydroperiod may substantially mediate interaction strengths in these ecosystems.

KW - Functional response

KW - Larval mosquitoes

KW - Predator-predator interaction

KW - Temporary wetland

KW - Water depth

KW - Zooplankton

U2 - 10.1016/j.limno.2019.125727

DO - 10.1016/j.limno.2019.125727

M3 - Article

AN - SCOPUS:85074947741

SN - 0075-9511

VL - 79

JO - Limnologica

JF - Limnologica

M1 - 125727

ER -

Additive multiple predator effects of two specialist paradiaptomid copepods towards larval mosquitoes

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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Cite this