Microzooplankton grazing in the gulf of california

Microzooplankton grazing in the gulf of california

Microzooplankton (organisms < 200 μm) grazing rates were determined using the dilution technique at nine stations in the central region of the Gulf of California and one in the sill of the Guaymas Basin, during spring, summer, and autumn 1995. The microzooplankton was numerically dominated by...

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主要な著者: García-Pámanes, J, Lara-Lara, JR
フォーマット: Online
言語:eng
出版事項: Iniversidad Autónoma de Baja California 2001
オンライン･アクセス:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/387
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spelling oai:cienciasmarinas.com.mx:article-3872019-05-13T19:02:04Z Microzooplankton grazing in the gulf of california Pastoreo por el microzooplancton en el Golfo de California García-Pámanes, J Lara-Lara, JR Gulf of California microzooplankton grazing Golfo de California microzooplancton pastoreo Microzooplankton (organisms < 200 μm) grazing rates were determined using the dilution technique at nine stations in the central region of the Gulf of California and one in the sill of the Guaymas Basin, during spring, summer, and autumn 1995. The microzooplankton was numerically dominated by protozoa, the most important being the dinoflagellates; the most frequent genera were Amphidinium , Oxytoxum ,  Gyrodinium , and  Peridinium . Ciliates were the second most important group and the most abundant genera were Mesodinium ,  Strombidium , and Strombilidium . Mean phytoplankton growth rates were 1.58, 1.64, and 1.82  d–1 during spring, summer, and autumn, respectively. Mean grazing rates were 1.25, 1.93, and 1.84  d–1 during spring, summer, and autumn, respectively. There were no significant differences in grazing rates among seasons (P > 0.05). Based on the grazing rates we estimated that the microzooplankton can consume about 89%, 106%, and 100% of the potential primary production during spring, summer, and autumn, respectively. Our results suggest that in Guaymas Basin there are two seasons in the year: spring, when a small fraction of the nanophytoplankton is not removed and may be exported to the bottom of the ocean; and summer/autumn, when nanophytoplankton biomass is totally consumed in the pelagic system. Se determinaron las tasas de pastoreo por el microzooplancton (organismos < 200 μm) en nueve estaciones localizadas en la región central del Golfo de California y una en el umbral de la cuenca de Guaymas durante primavera, verano y otoño de 1995, utilizando la técnica de dilución. El microzooplancton estuvo dominado por los protozoarios, siendo los dinoflagelados el grupo más importante; los géneros más frecuentes fueron  Amphidinium,  Oxytoxum ,  Gyrodinium y  Peridinium. Los ciliados fueron el segundo grupo en importancia y los géneros más comunes fueron  Mesodinium , Strombidium y  Strombilidium . Las tasas promedio de crecimiento del fitoplancton fueron 1.58, 1.64 y 1.82 d–1 para primavera, verano y otoño, respectivamente. Las tasas promedio de pastoreo fueron 1.25, 1.93 y 1.84 d–1 para primavera, verano y otoño, respectivamente. No se encontraron diferencias estadísticamente significativas entre las tasas de pastoreo de las estaciones del año (P > 0.05). Se estimó que el microzooplancton puede llegar a consumir alrededor de 89%, 106% y 100% de la producción primaria potencial diaria durante primavera, verano y otoño, respectivamente. Nuestros resultados sugieren que en la cuenca de Guaymas existen dos estaciones en el año: primavera, cuando una fracción relativamente pequeña del nanofitoplancton no alcanza a ser removida y posiblemente se exporte al fondo del océano; y verano/otoño, cuando la totalidad de la biomasa del nanofitoplancton es consumida en el sistema pelágico. Iniversidad Autónoma de Baja California 2001-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/387 10.7773/cm.v27i1.387 Ciencias Marinas; Vol. 27 No. 1 (2001); 73-90 Ciencias Marinas; Vol. 27 Núm. 1 (2001); 73-90 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/387/330
institution Ciencias Marinas
collection OJS
language eng
format Online
author García-Pámanes, J
Lara-Lara, JR
spellingShingle García-Pámanes, J
Lara-Lara, JR
Microzooplankton grazing in the gulf of california
author_facet García-Pámanes, J
Lara-Lara, JR
author_sort García-Pámanes, J
title Microzooplankton grazing in the gulf of california
title_short Microzooplankton grazing in the gulf of california
title_full Microzooplankton grazing in the gulf of california
title_fullStr Microzooplankton grazing in the gulf of california
title_full_unstemmed Microzooplankton grazing in the gulf of california
title_sort microzooplankton grazing in the gulf of california
description Microzooplankton (organisms < 200 μm) grazing rates were determined using the dilution technique at nine stations in the central region of the Gulf of California and one in the sill of the Guaymas Basin, during spring, summer, and autumn 1995. The microzooplankton was numerically dominated by protozoa, the most important being the dinoflagellates; the most frequent genera were Amphidinium , Oxytoxum ,  Gyrodinium , and  Peridinium . Ciliates were the second most important group and the most abundant genera were Mesodinium ,  Strombidium , and Strombilidium . Mean phytoplankton growth rates were 1.58, 1.64, and 1.82  d–1 during spring, summer, and autumn, respectively. Mean grazing rates were 1.25, 1.93, and 1.84  d–1 during spring, summer, and autumn, respectively. There were no significant differences in grazing rates among seasons (P > 0.05). Based on the grazing rates we estimated that the microzooplankton can consume about 89%, 106%, and 100% of the potential primary production during spring, summer, and autumn, respectively. Our results suggest that in Guaymas Basin there are two seasons in the year: spring, when a small fraction of the nanophytoplankton is not removed and may be exported to the bottom of the ocean; and summer/autumn, when nanophytoplankton biomass is totally consumed in the pelagic system.
publisher Iniversidad Autónoma de Baja California
publishDate 2001
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/387
_version_ 1715723962274545664

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