Species-specific ontogenetic diet shifts attenuate trophic cascades and lengthen food chains in exploited ecosystems
Ontogenetic diet shifts are pervasive in food websbut rules governing their emergence and the implications for trophic cascades are only partly understood. Recent theoretical advances in multispecies size spectrum models (MSSMs) predict that the emergence of ontogenetic diet shifts are driven primar...
Published in: | Oikos |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Blackwell Munksgaard
2019
|
Subjects: | |
Online Access: | https://doi.org/10.1111/oik.05630 http://ecite.utas.edu.au/144011 |
id |
ftunivtasecite:oai:ecite.utas.edu.au:144011 |
---|---|
record_format |
openpolar |
spelling |
ftunivtasecite:oai:ecite.utas.edu.au:144011 2023-05-15T15:43:57+02:00 Species-specific ontogenetic diet shifts attenuate trophic cascades and lengthen food chains in exploited ecosystems Reum, JCP Blanchard, JL Holsman, KK Aydin, K Punt, AE 2019 https://doi.org/10.1111/oik.05630 http://ecite.utas.edu.au/144011 en eng Blackwell Munksgaard http://dx.doi.org/10.1111/oik.05630 http://purl.org/au-research/grants/arc/DP170104240 Reum, JCP and Blanchard, JL and Holsman, KK and Aydin, K and Punt, AE, Species-specific ontogenetic diet shifts attenuate trophic cascades and lengthen food chains in exploited ecosystems, Oikos, 128, (7) pp. 1051-1064. ISSN 0030-1299 (2019) [Refereed Article] http://ecite.utas.edu.au/144011 Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) Refereed Article PeerReviewed 2019 ftunivtasecite https://doi.org/10.1111/oik.05630 2021-05-10T22:16:38Z Ontogenetic diet shifts are pervasive in food websbut rules governing their emergence and the implications for trophic cascades are only partly understood. Recent theoretical advances in multispecies size spectrum models (MSSMs) predict that the emergence of ontogenetic diet shifts are driven primarily by size-selective predation and changes in the relative abundances of suitably sized prey. Howeverthese assumptions have not yet been tested with data. Herewe developed alternative MSSMs based on different assumptions about the nature of species and size-based preferences and tested them using an extensive dietary database for the Eastern Bering Sea (EBS). MSSMs with both size and species-specific prey preferences correctly predicted approximately three-fold more of the diet links than those that assumed fixed species preferences. Importantlythese model assumptions also had a profound effect on the strength of fishing-induced trophic cascades and the emergent trophic structure of the community with and without fishing. The diet-informed models exhibited lower predation mortality ratesparticularly for small individuals (less than 1 g) whichin turnreduced the intensity and reach of fishing-induced trophic cascades up the size spectrum. If the level and size dependency of piscivory observed in EBS predators is typical of other systemsthe potential for fishing-induced trophic cascades may be over-stated in MSSMs as they are currently formulated and parameterized. Representation of species-specific ontogenetic shifts in diet can strongly influence system responses to perturbationsand the extensions we propose should accelerate adoption of MSSMs as frameworks for exploring size-based food web theory and developing modeling tools to support strategic management decisions. Article in Journal/Newspaper Bering Sea eCite UTAS (University of Tasmania) Bering Sea Oikos 128 7 1051 1064 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) |
spellingShingle |
Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) Reum, JCP Blanchard, JL Holsman, KK Aydin, K Punt, AE Species-specific ontogenetic diet shifts attenuate trophic cascades and lengthen food chains in exploited ecosystems |
topic_facet |
Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) |
description |
Ontogenetic diet shifts are pervasive in food websbut rules governing their emergence and the implications for trophic cascades are only partly understood. Recent theoretical advances in multispecies size spectrum models (MSSMs) predict that the emergence of ontogenetic diet shifts are driven primarily by size-selective predation and changes in the relative abundances of suitably sized prey. Howeverthese assumptions have not yet been tested with data. Herewe developed alternative MSSMs based on different assumptions about the nature of species and size-based preferences and tested them using an extensive dietary database for the Eastern Bering Sea (EBS). MSSMs with both size and species-specific prey preferences correctly predicted approximately three-fold more of the diet links than those that assumed fixed species preferences. Importantlythese model assumptions also had a profound effect on the strength of fishing-induced trophic cascades and the emergent trophic structure of the community with and without fishing. The diet-informed models exhibited lower predation mortality ratesparticularly for small individuals (less than 1 g) whichin turnreduced the intensity and reach of fishing-induced trophic cascades up the size spectrum. If the level and size dependency of piscivory observed in EBS predators is typical of other systemsthe potential for fishing-induced trophic cascades may be over-stated in MSSMs as they are currently formulated and parameterized. Representation of species-specific ontogenetic shifts in diet can strongly influence system responses to perturbationsand the extensions we propose should accelerate adoption of MSSMs as frameworks for exploring size-based food web theory and developing modeling tools to support strategic management decisions. |
format |
Article in Journal/Newspaper |
author |
Reum, JCP Blanchard, JL Holsman, KK Aydin, K Punt, AE |
author_facet |
Reum, JCP Blanchard, JL Holsman, KK Aydin, K Punt, AE |
author_sort |
Reum, JCP |
title |
Species-specific ontogenetic diet shifts attenuate trophic cascades and lengthen food chains in exploited ecosystems |
title_short |
Species-specific ontogenetic diet shifts attenuate trophic cascades and lengthen food chains in exploited ecosystems |
title_full |
Species-specific ontogenetic diet shifts attenuate trophic cascades and lengthen food chains in exploited ecosystems |
title_fullStr |
Species-specific ontogenetic diet shifts attenuate trophic cascades and lengthen food chains in exploited ecosystems |
title_full_unstemmed |
Species-specific ontogenetic diet shifts attenuate trophic cascades and lengthen food chains in exploited ecosystems |
title_sort |
species-specific ontogenetic diet shifts attenuate trophic cascades and lengthen food chains in exploited ecosystems |
publisher |
Blackwell Munksgaard |
publishDate |
2019 |
url |
https://doi.org/10.1111/oik.05630 http://ecite.utas.edu.au/144011 |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_relation |
http://dx.doi.org/10.1111/oik.05630 http://purl.org/au-research/grants/arc/DP170104240 Reum, JCP and Blanchard, JL and Holsman, KK and Aydin, K and Punt, AE, Species-specific ontogenetic diet shifts attenuate trophic cascades and lengthen food chains in exploited ecosystems, Oikos, 128, (7) pp. 1051-1064. ISSN 0030-1299 (2019) [Refereed Article] http://ecite.utas.edu.au/144011 |
op_doi |
https://doi.org/10.1111/oik.05630 |
container_title |
Oikos |
container_volume |
128 |
container_issue |
7 |
container_start_page |
1051 |
op_container_end_page |
1064 |
_version_ |
1766378161616977920 |