Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling

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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Hauptverfasser: Linacre, Lorena, Lara-Lara, J Rubén, Mirabal-Gómez, Uriel, Durazo, Reginaldo, Bazán-Guzmán, Carmen
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Sprache:eng
Veröffentlicht: Iniversidad Autónoma de Baja California 2017
Online Zugang:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2753
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id repositorioinstitucional-20.500.12930-7526
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language eng
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. 
format info:eu-repo/semantics/article
author Linacre, Lorena
Lara-Lara, J Rubén
Mirabal-Gómez, Uriel
Durazo, Reginaldo
Bazán-Guzmán, Carmen
spellingShingle Linacre, Lorena
Lara-Lara, J Rubén
Mirabal-Gómez, Uriel
Durazo, Reginaldo
Bazán-Guzmán, Carmen
Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling
author_facet Linacre, Lorena
Lara-Lara, J Rubén
Mirabal-Gómez, Uriel
Durazo, Reginaldo
Bazán-Guzmán, Carmen
author_sort Linacre, Lorena
title Microzooplankton grazing impact on the phytoplankton community at a coastal upwelling
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
publisher Iniversidad Autónoma de Baja California
publishDate 2017
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2753
_version_ 1792608728012292096
spelling repositorioinstitucional-20.500.12930-75262023-05-09T14:30:22Z 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 Linacre, Lorena Lara-Lara, J Rubén Mirabal-Gómez, Uriel Durazo, Reginaldo Bazán-Guzmán, Carmen 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.  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. 2017-06-30 2021-06-03T03:55:34Z 2021-06-03T03:55:34Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2753 10.7773/cm.v43i2.2753 https://hdl.handle.net/20.500.12930/7526 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2753/1644 Copyright (c) 2017 Ciencias Marinas application/pdf Iniversidad Autónoma de Baja California 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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