Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling

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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Autores: Linacre, Lorena, Lara-Lara, J Rubén, Mirabal-Gómez, Uriel, Durazo, Reginaldo, Bazán-Guzmán, Carmen
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:México
Institución:UNIVERSIDAD AUTÓNOMA DE BAJA CALIFORNIA
Repositorio:Ciencias Marinas
Idioma:inglés
OAI Identifier:oai:cienciasmarinas.com.mx:article/2753
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2753
Access Level:acceso abierto
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dc.title.none.fl_str_mv Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling
Impacto del pastoreo del microzooplancton sobre la comunidad fitoplanctónica en una estación de surgencia costera localizada en la región norte de Baja California, México
title Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling
spellingShingle Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling
Linacre, Lorena
title_short Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling
title_full Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling
title_fullStr Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling
title_full_unstemmed Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling
title_sort Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling
dc.creator.none.fl_str_mv Linacre, Lorena
Lara-Lara, J Rubén
Mirabal-Gómez, Uriel
Durazo, Reginaldo
Bazán-Guzmán, Carmen
author Linacre, Lorena
author_facet Linacre, Lorena
Lara-Lara, J Rubén
Mirabal-Gómez, Uriel
Durazo, Reginaldo
Bazán-Guzmán, Carmen
author_role author
author2 Lara-Lara, J Rubén
Mirabal-Gómez, Uriel
Durazo, Reginaldo
Bazán-Guzmán, Carmen
author2_role author
author
author
author
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 2017-06-30
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
Artículo Arbitrado
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2753
10.7773/cm.v43i2.2753
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2753
identifier_str_mv 10.7773/cm.v43i2.2753
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2753/1644
https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2753/420420597
https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2753/420420774
dc.rights.none.fl_str_mv Copyright (c) 2017 Ciencias Marinas
https://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2017 Ciencias Marinas
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eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
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dc.publisher.none.fl_str_mv Iniversidad Autónoma de Baja California
publisher.none.fl_str_mv Iniversidad Autónoma de Baja California
dc.source.none.fl_str_mv Ciencias Marinas; Vol. 43 No. 2 (2017); 93-108
Ciencias Marinas; Vol. 43 Núm. 2 (2017); 93-108
2395-9053
0185-3880
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instacron:UABC
instname_str UNIVERSIDAD AUTÓNOMA DE BAJA CALIFORNIA
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spelling Microzooplankton grazing impact on the phytoplankton community at a coastal upwellingImpacto del pastoreo del microzooplancton sobre la comunidad fitoplanctónica en una estación de surgencia costera localizada en la región norte de Baja California, MéxicoLinacre, LorenaLara-Lara, J RubénMirabal-Gómez, UrielDurazo, ReginaldoBazán-Guzmán, CarmenExperiments 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. En un sitio de surgencia costera (estación ENSENADA) frente a la región norte de Baja California (México) se realizaron experimentos durante el otoño de 2015 (OCT-15) y la primavera de 2016 (ABR-16) para estimar las tasas diarias de crecimiento (µo) y mortalidad (m) del fitoplancton, que permitieron evaluar el impacto (m:µo) que genera el pastoreo diario del microzooplancton sobre la comunidad de fitoplancton y grupos autótrofos específicos. Acorde con la estacionalidad de la región y bajo el escenario de un calentamiento ambiental debido al evento El Niño 2015–2016, se observaron notables diferencias en las condiciones hidrográficas y en la dinámica de crecimiento y mortalidad de la comunidad de fitoplancton entre los 2 periodos de estudio. Las estimaciones de µo y m fueron, respectivamente, 0.120 ± 0.012 d–1 y 1.145 ± 0.049 d–1 para OCT-15 y 1.186 ± 0.002 d–1 y 0.409 ± 0.086 d–1 para ABR-16. Los resultados de este estudio sugieren que los efectos del calentamiento anómalo sobre la comunidad del fitoplancton fueron más evidentes durante OCT-15. En ese periodo, los componentes autotróficos más grandes (diatomeas) estuvieron fuertemente restringidos en su crecimiento, posiblemente por una limitación ambiental de nutrientes ocasionada por el hundimiento de la termoclina debido al mayor aporte de agua cálida. Además, se estimó un activo consumo del microzooplancton sobre la biomasa (72% de clorofila a [Chla]) y producción primaria (PP = 0.20 µg Chla·L–1·d–1) de fitoplancton (>100% de la PP). Para ABR-16, cuando aparentemente se empezaron a manifestar las condiciones propias de primavera en el ecosistema, se estimó una PP alta (3.73 µg Chla·L–1·d–1) y sólo una tercera parte de ésta fue consumida por el microzooplancton (34% de la PP). Los resultados de esta investigación revelan el alto dinamismo de las tramas tróficas multívoras acoplado a la variabilidad estacional e interanual de los sistemas de surgencia costera.Iniversidad Autónoma de Baja California2017-06-30info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionPeer-reviewed Article Artículo Arbitradoapplication/pdftext/xmltext/xmlhttps://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/275310.7773/cm.v43i2.2753Ciencias Marinas; Vol. 43 No. 2 (2017); 93-108Ciencias Marinas; Vol. 43 Núm. 2 (2017); 93-1082395-90530185-3880reponame:Ciencias Marinasinstname:UNIVERSIDAD AUTÓNOMA DE BAJA CALIFORNIAinstacron:UABCenghttps://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2753/1644https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2753/420420597https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2753/420420774Copyright (c) 2017 Ciencias Marinashttps://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccessoai:cienciasmarinas.com.mx:article/27532024-08-22T17:01:41Z
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