FN Archimer Export Format
PT J
TI On the sensitivity of plankton ecosystem models to the formulation of zooplankton grazing
BT 
AF Chenillat, Fanny
   Rivière, Pascal
   Ohman, Mark D.
AS 1:1;2:3;3:2;
FF 1:;2:;3:;
C1 Laboratoire des Sciences de l’Environnement Marin (LEMAR), Université de Brest, Ifremer, IRD, IUEM, Brest, France
   Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, United States of America
   Laboratoire des Sciences de l’Environnement Marin (LEMAR), Université de Brest, Ifremer, IRD, IUEM, Brest, France
C2 IRD, FRANCE
   UNIV CALIF SAN DIEGO, USA
   UBO, FRANCE
UM LEMAR
IN WOS Cotutelle UMR
   DOAJ
   copubli-int-hors-europe
IF 3.752
TC 14
UR https://archimer.ifremer.fr/doc/00696/80796/84277.pdf
   https://archimer.ifremer.fr/doc/00696/80796/84278.docx
   https://archimer.ifremer.fr/doc/00696/80796/84279.docx
   https://archimer.ifremer.fr/doc/00696/80796/84280.docx
   https://archimer.ifremer.fr/doc/00696/80796/84281.docx
   https://archimer.ifremer.fr/doc/00696/80796/84282.docx
   https://archimer.ifremer.fr/doc/00696/80796/84283.docx
   https://archimer.ifremer.fr/doc/00696/80796/84284.docx
   https://archimer.ifremer.fr/doc/00696/80796/84285.docx
   https://archimer.ifremer.fr/doc/00696/80796/84286.docx
   https://archimer.ifremer.fr/doc/00696/80796/84287.docx
   https://archimer.ifremer.fr/doc/00696/80796/84288.docx
   https://archimer.ifremer.fr/doc/00696/80796/84289.docx
   https://archimer.ifremer.fr/doc/00696/80796/84290.docx
LA English
DT Article
AB Model representations of plankton structure and dynamics have consequences for a broad spectrum of ocean processes. Here we focus on the representation of zooplankton and their grazing dynamics in such models. It remains unclear whether phytoplankton community composition, growth rates, and spatial patterns in plankton ecosystem models are especially sensitive to the specific means of representing zooplankton grazing. We conduct a series of numerical experiments that explicitly address this question. We focus our study on the form of the functional response to changes in prey density, including the formulation of a grazing refuge. We use a contemporary biogeochemical model based on continuum size-structured organization, including phytoplankton diversity, coupled to a physical model of the California Current System. This region is of particular interest because it exhibits strong spatial gradients. We find that small changes in grazing refuge formulation across a range of plausible functional forms drive fundamental differences in spatial patterns of plankton concentrations, species richness, pathways of grazing fluxes, and underlying seasonal cycles. An explicit grazing refuge, with refuge prey concentration dependent on grazers’ body size, using allometric scaling, is likely to provide more coherent plankton ecosystem dynamics compared to classic formulations or size-independent threshold refugia. We recommend that future plankton ecosystem models pay particular attention to the grazing formulation and implement a threshold refuge incorporating size-dependence, and we call for a new suite of experimental grazing studies. 
PY 2021
PD MAY
SO Plos One
SN 1932-6203
PU Public Library of Science (PLoS)
VL 16
IS 5
UT 000664633100022
DI 10.1371/journal.pone.0252033
ID 80796
ER

EF