Seasonal variability in copepod biomass in a cyclonic eddy in the Bay of La Paz, southern Gulf of California, Mexico

Seasonal variability in copepod biomass in a cyclonic eddy in the Bay of La Paz, southern Gulf of California, Mexico

As one of the main groups comprising marine zooplankton, copepods play an important role due to their position in the trophic web. We assessed the copepod biomass in a cyclonic eddy during 2 contrasting seasons in the Bay of La Paz, southern Gulf of California, which is characterized by high biologi...

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Autores principales: Rocha-Díaz, Franco Antonio, Monreal-Gómez, María Adela, Coria-Monter, Erik, Salas-de-León, David Alberto, Durán-Campos, Elizabeth
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Lenguaje:eng
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Publicado: Iniversidad Autónoma de Baja California 2022
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3167
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record_format ojs
institution Ciencias Marinas
collection OJS
language eng
spa
format Online
author Rocha-Díaz, Franco Antonio
Monreal-Gómez, María Adela
Coria-Monter, Erik
Salas-de-León, David Alberto
Durán-Campos, Elizabeth
spellingShingle Rocha-Díaz, Franco Antonio
Monreal-Gómez, María Adela
Coria-Monter, Erik
Salas-de-León, David Alberto
Durán-Campos, Elizabeth
Seasonal variability in copepod biomass in a cyclonic eddy in the Bay of La Paz, southern Gulf of California, Mexico
author_facet Rocha-Díaz, Franco Antonio
Monreal-Gómez, María Adela
Coria-Monter, Erik
Salas-de-León, David Alberto
Durán-Campos, Elizabeth
author_sort Rocha-Díaz, Franco Antonio
title Seasonal variability in copepod biomass in a cyclonic eddy in the Bay of La Paz, southern Gulf of California, Mexico
title_short Seasonal variability in copepod biomass in a cyclonic eddy in the Bay of La Paz, southern Gulf of California, Mexico
title_full Seasonal variability in copepod biomass in a cyclonic eddy in the Bay of La Paz, southern Gulf of California, Mexico
title_fullStr Seasonal variability in copepod biomass in a cyclonic eddy in the Bay of La Paz, southern Gulf of California, Mexico
title_full_unstemmed Seasonal variability in copepod biomass in a cyclonic eddy in the Bay of La Paz, southern Gulf of California, Mexico
title_sort seasonal variability in copepod biomass in a cyclonic eddy in the bay of la paz, southern gulf of california, mexico
description As one of the main groups comprising marine zooplankton, copepods play an important role due to their position in the trophic web. We assessed the copepod biomass in a cyclonic eddy during 2 contrasting seasons in the Bay of La Paz, southern Gulf of California, which is characterized by high biological productivity. Two oceanographic expeditions took place in the winter of 2006 and the summer of 2009; a CTD probe was used to determine the physical structure of the water column, and oblique zooplankton hauls collected zooplankton samples. Satellite data were used to visualize the chlorophyll a (Chla) distribution patterns. The results showed a well-defined cyclonic eddy in both seasons, with a diameter of ~25 km and geostrophic velocities >50 cm·s–1 in its periphery. At the edges of the eddy, Chla was high, reaching ~3 mg·m–3 in winter. The maximum calanoid copepod biomass occurred in winter, reaching 6.6 mg·100 m–3 in the western bay close to the coast; moreover, their distribution corresponded well with the Chla and circulation patterns, forming a belt shape following the periphery of the eddy, with a second peak close to the connection with the gulf. The mean values of copepod biomass exhibited a pattern with alternating calanoids-cyclopoids between winter and summer within the cyclonic eddy, with calanoid biomass higher than cyclopoid biomass in winter, which was the opposite of summer. The results highlight the impacts of the eddy on the planktonic ecosystem through its influence on the hydrographic conditions in the water column. Other factors, such as ecological interactions, population dynamics, and feeding habits, may also play a role. Feeding behavior is affected by the high concentrations of Chla, which represent a source of food for copepods observed around the eddy.
publisher Iniversidad Autónoma de Baja California
publishDate 2022
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3167
_version_ 1792095472096116736
spelling oai:cienciasmarinas.com.mx:article-31672023-12-19T15:03:35Z Seasonal variability in copepod biomass in a cyclonic eddy in the Bay of La Paz, southern Gulf of California, Mexico Variabilidad estacional de la biomasa de copépodos en un vórtice ciclónico en la bahía de la Paz, sur del golfo de California, México Rocha-Díaz, Franco Antonio Monreal-Gómez, María Adela Coria-Monter, Erik Salas-de-León, David Alberto Durán-Campos, Elizabeth copepods, biomass, cyclonic eddy, Bay of La Paz, Gulf of California copépodos, biomasa, vórtice ciclónico, Bahía de La Paz, Golfo de California As one of the main groups comprising marine zooplankton, copepods play an important role due to their position in the trophic web. We assessed the copepod biomass in a cyclonic eddy during 2 contrasting seasons in the Bay of La Paz, southern Gulf of California, which is characterized by high biological productivity. Two oceanographic expeditions took place in the winter of 2006 and the summer of 2009; a CTD probe was used to determine the physical structure of the water column, and oblique zooplankton hauls collected zooplankton samples. Satellite data were used to visualize the chlorophyll a (Chla) distribution patterns. The results showed a well-defined cyclonic eddy in both seasons, with a diameter of ~25 km and geostrophic velocities >50 cm·s–1 in its periphery. At the edges of the eddy, Chla was high, reaching ~3 mg·m–3 in winter. The maximum calanoid copepod biomass occurred in winter, reaching 6.6 mg·100 m–3 in the western bay close to the coast; moreover, their distribution corresponded well with the Chla and circulation patterns, forming a belt shape following the periphery of the eddy, with a second peak close to the connection with the gulf. The mean values of copepod biomass exhibited a pattern with alternating calanoids-cyclopoids between winter and summer within the cyclonic eddy, with calanoid biomass higher than cyclopoid biomass in winter, which was the opposite of summer. The results highlight the impacts of the eddy on the planktonic ecosystem through its influence on the hydrographic conditions in the water column. Other factors, such as ecological interactions, population dynamics, and feeding habits, may also play a role. Feeding behavior is affected by the high concentrations of Chla, which represent a source of food for copepods observed around the eddy. Los copépodos, como uno de los principales grupos que componen el zooplancton marino, juegan un papel importante por su posición en la red trófica. Se evaluó la biomasa de copépodos en un vórtice ciclónico durante 2 estaciones climáticas contrastantes en la bahía de La Paz, al sur del golfo de California, la cual se caracteriza por una alta productividad biológica. Durante 2 campañas oceanográficas en invierno de 2006 y verano de 2009, se determinó la estructura física de la columna de agua mediante un CTD y se recolectaron muestras de zooplancton mediante arrastres oblicuos. Se utilizaron datos de satélite para visualizar los patrones de distribución de clorofila a (Cla). Los resultados mostraron un vórtice ciclónico en ambas estaciones, con un diámetro de ~25 km y velocidades geostróficas >50 cm·s–1 en su periferia, con elevada Cla (~3 mg·m–3 en invierno). La máxima biomasa de calanoides ocurrió en invierno, con hasta 6.6 mg·100 m–3 en el oeste de la bahía, cerca de la costa; además, su distribución coincidió con el patrón de Cla y circulación, ya que formó un anillo siguiendo la periferia del vórtice, con un segundo pico cerca de la conexión con el golfo. Los valores medios de biomasa de copépodos mostraron un patrón de alternancia calanoides-ciclopoides entre invierno y verano dentro del vórtice ciclónico, con más biomasa de calanoides que ciclopoides en invierno y lo contrario en verano. Los resultados resaltan el impacto del vórtice en el ecosistema planctónico a través de su influencia sobre las condiciones hidrográficas en la columna de agua. Otros factores, como las interacciones ecológicas, la dinámica poblacional y los hábitos alimenticios, también pueden jugar un papel importante. El comportamiento alimentario es afectado por altas concentraciones de Cla, que representan una fuente de alimento para copépodos observados alrededor del vórtice. Iniversidad Autónoma de Baja California 2022-11-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf text/xml text/xml https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3167 10.7773/cm.y2022.3167 Ciencias Marinas; Vol. 48 (2022) Ciencias Marinas; Vol. 48 (2022) 2395-9053 0185-3880 eng spa https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3167/420420698 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3167/420420899 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3167/420420900 Copyright (c) 2022 Franco Antonio Rocha-Díaz, María Adela Monreal-Gómez, Erik Coria-Monter, David Alberto Salas-de-León, Elizabeth Durán-Campos https://creativecommons.org/licenses/by/4.0

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