Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling station off northern Baja California, Mexico

Experiments were carried out at a coastal upwelling site (ENSENADA station) off northern Baja California (México) during autumn 2015 (OCT-15) and spring 2016 (APR-16) to estimate phytoplankton daily growth (μo) and mortality (m) rates and to assess microzooplankton grazing impact (m:μo) on the phyto...

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Authors: Lorena Linacre, J. Rubén Lara-Lara, Uriel Mirabal-Gómez, Reginaldo Durazo, Carmen Bazán-Guzmán
Format: article
Status:Published version
Publication Date:2017
Country:México
Institution:Universidad Autónoma de Baja California
Repository:Redalyc-UABC
OAI Identifier:oai:redalyc.org:48052086003
Online Access:https://www.redalyc.org/articulo.oa?id=48052086003
Access Level:Open access
Keyword:Ciencias de la Tierra
2016
El Niño 2015
Baja California
ENSENADA station
microzooplankton grazing
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spelling Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling station off northern Baja California, MexicoLorena LinacreJ. Rubén Lara-LaraUriel Mirabal-GómezReginaldo DurazoCarmen Bazán-GuzmánCiencias de la Tierra2016El Niño 2015Baja CaliforniaENSENADA stationmicrozooplankton grazingExperiments were carried out at a coastal upwelling site (ENSENADA station) off northern Baja California (México) during autumn 2015 (OCT-15) and spring 2016 (APR-16) to estimate phytoplankton daily growth (μo) and mortality (m) rates and to assess microzooplankton grazing impact (m:μo) on the phytoplankton community and specific autotrophic groups. In accordance with regional seasonality and under an environmental warming scenario due to the El Niño 2015–2016 event, significant differences in both hydrographic conditions and the growth–mortality dynamics of the phytoplankton community were observed between the 2 study periods. The μo and m estimates were, respectively, 0.120 ± 0.012 d–1 and 1.145 ± 0.049 d–1 for OCT-15 and 1.186 ± 0.002 d–1 and 0.409 ± 0.086 d–1 for APR-16. The results of this study suggest that the effects of the anomalous warming on the phytoplankton community were more evident in OCT-15. During that period, growth of the larger autotrophic components (diatoms) was severely controlled by the environmental limitation of nutrients caused by the sinking of the thermocline that resulted from the entrance of warm water to the region. Furthermore, microzooplankton exerted active grazing pressure on phytoplankton biomass (72% of chlorophyll a [Chla]) and primary production (PP = 0.20 μg Chla·L–1·d–1), with grazing impact >100% of PP. In APR-16, when the ecosystem apparently started returning to the spring conditions, a high value for PP (3.73 μg Chla·L–1·d–1) was estimated, with only one third of it being consumed by microzooplankton (34% of PP). The results of this research evidence the high dynamism of multivorous food webs coupled to the seasonal and interannual variability of coastal upwelling systems.Universidad Autónoma de Baja California2017info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdf0185-3880https://www.redalyc.org/articulo.oa?id=48052086003Ciencias Marinas (México) Num.2 Vol.43reponame:Redalyc-UABCinstname:Universidad Autónoma de Baja Californiainstacron:UABCenhttp://www.redalyc.org/revista.oa?id=480Ciencias Marinasinfo:eu-repo/semantics/openAccessoai:redalyc.org:480520860032024-08-23T15:27:04Z
dc.title.none.fl_str_mv Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling station off northern Baja California, Mexico
title Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling station off northern Baja California, Mexico
spellingShingle Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling station off northern Baja California, Mexico
Lorena Linacre
Ciencias de la Tierra
2016
El Niño 2015
Baja California
ENSENADA station
microzooplankton grazing
title_short Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling station off northern Baja California, Mexico
title_full Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling station off northern Baja California, Mexico
title_fullStr Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling station off northern Baja California, Mexico
title_full_unstemmed Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling station off northern Baja California, Mexico
title_sort Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling station off northern Baja California, Mexico
dc.creator.none.fl_str_mv Lorena Linacre
J. Rubén Lara-Lara
Uriel Mirabal-Gómez
Reginaldo Durazo
Carmen Bazán-Guzmán
author Lorena Linacre
author_facet Lorena Linacre
J. Rubén Lara-Lara
Uriel Mirabal-Gómez
Reginaldo Durazo
Carmen Bazán-Guzmán
author_role author
author2 J. Rubén Lara-Lara
Uriel Mirabal-Gómez
Reginaldo Durazo
Carmen Bazán-Guzmán
author2_role author
author
author
author
dc.subject.none.fl_str_mv Ciencias de la Tierra
2016
El Niño 2015
Baja California
ENSENADA station
microzooplankton grazing
topic Ciencias de la Tierra
2016
El Niño 2015
Baja California
ENSENADA station
microzooplankton grazing
description Experiments were carried out at a coastal upwelling site (ENSENADA station) off northern Baja California (México) during autumn 2015 (OCT-15) and spring 2016 (APR-16) to estimate phytoplankton daily growth (μo) and mortality (m) rates and to assess microzooplankton grazing impact (m:μo) on the phytoplankton community and specific autotrophic groups. In accordance with regional seasonality and under an environmental warming scenario due to the El Niño 2015–2016 event, significant differences in both hydrographic conditions and the growth–mortality dynamics of the phytoplankton community were observed between the 2 study periods. The μo and m estimates were, respectively, 0.120 ± 0.012 d–1 and 1.145 ± 0.049 d–1 for OCT-15 and 1.186 ± 0.002 d–1 and 0.409 ± 0.086 d–1 for APR-16. The results of this study suggest that the effects of the anomalous warming on the phytoplankton community were more evident in OCT-15. During that period, growth of the larger autotrophic components (diatoms) was severely controlled by the environmental limitation of nutrients caused by the sinking of the thermocline that resulted from the entrance of warm water to the region. Furthermore, microzooplankton exerted active grazing pressure on phytoplankton biomass (72% of chlorophyll a [Chla]) and primary production (PP = 0.20 μg Chla·L–1·d–1), with grazing impact >100% of PP. In APR-16, when the ecosystem apparently started returning to the spring conditions, a high value for PP (3.73 μg Chla·L–1·d–1) was estimated, with only one third of it being consumed by microzooplankton (34% of PP). The results of this research evidence the high dynamism of multivorous food webs coupled to the seasonal and interannual variability of coastal upwelling systems.
publishDate 2017
dc.date.none.fl_str_mv 2017
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv 0185-3880
https://www.redalyc.org/articulo.oa?id=48052086003
identifier_str_mv 0185-3880
url https://www.redalyc.org/articulo.oa?id=48052086003
dc.language.none.fl_str_mv en
language_invalid_str_mv en
dc.relation.none.fl_str_mv http://www.redalyc.org/revista.oa?id=480
dc.rights.none.fl_str_mv Ciencias Marinas
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Ciencias Marinas
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Autónoma de Baja California
publisher.none.fl_str_mv Universidad Autónoma de Baja California
dc.source.none.fl_str_mv Ciencias Marinas (México) Num.2 Vol.43
reponame:Redalyc-UABC
instname:Universidad Autónoma de Baja California
instacron:UABC
instname_str Universidad Autónoma de Baja California
instacron_str UABC
institution UABC
reponame_str Redalyc-UABC
collection Redalyc-UABC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,198674

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