Phytoplankton composition and biomass under oligotrophic conditions in the Guaymas Basin (Gulf of California)

Phytoplankton composition and biomass under oligotrophic conditions in the Guaymas Basin (Gulf of California)

In order to determine the structure and biomass of phytoplankton (picophytoplankton, nanodiatoms, and microdiatoms) under oligotrophic conditions, a study was carried out in the surface layer of the Guaymas Basin, Gulf of California, during the late summer of 2016. This study included the measuremen...

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Main Authors: Millán-Nuñez, Eduardo, Delgadillo-Hinojosa, Francisco, Hakspiel-Segura, Cristian, Torres-Delgado, Eunise Vanessa, Félix-Bermúdez, Armando, Segovia-Zavala, José Antonio, Camacho-Ibar, Víctor Froylán, Munoz-Barbosa, Albino
Format: Online
Language:eng
spa
Published: Iniversidad Autónoma de Baja California 2023
Online Access:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3302
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id oai:cienciasmarinas.com.mx:article-3302
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
spa
format Online
author Millán-Nuñez, Eduardo
Delgadillo-Hinojosa, Francisco
Hakspiel-Segura, Cristian
Torres-Delgado, Eunise Vanessa
Félix-Bermúdez, Armando
Segovia-Zavala, José Antonio
Camacho-Ibar, Víctor Froylán
Munoz-Barbosa, Albino
spellingShingle Millán-Nuñez, Eduardo
Delgadillo-Hinojosa, Francisco
Hakspiel-Segura, Cristian
Torres-Delgado, Eunise Vanessa
Félix-Bermúdez, Armando
Segovia-Zavala, José Antonio
Camacho-Ibar, Víctor Froylán
Munoz-Barbosa, Albino
Phytoplankton composition and biomass under oligotrophic conditions in the Guaymas Basin (Gulf of California)
author_facet Millán-Nuñez, Eduardo
Delgadillo-Hinojosa, Francisco
Hakspiel-Segura, Cristian
Torres-Delgado, Eunise Vanessa
Félix-Bermúdez, Armando
Segovia-Zavala, José Antonio
Camacho-Ibar, Víctor Froylán
Munoz-Barbosa, Albino
author_sort Millán-Nuñez, Eduardo
title Phytoplankton composition and biomass under oligotrophic conditions in the Guaymas Basin (Gulf of California)
title_short Phytoplankton composition and biomass under oligotrophic conditions in the Guaymas Basin (Gulf of California)
title_full Phytoplankton composition and biomass under oligotrophic conditions in the Guaymas Basin (Gulf of California)
title_fullStr Phytoplankton composition and biomass under oligotrophic conditions in the Guaymas Basin (Gulf of California)
title_full_unstemmed Phytoplankton composition and biomass under oligotrophic conditions in the Guaymas Basin (Gulf of California)
title_sort phytoplankton composition and biomass under oligotrophic conditions in the guaymas basin (gulf of california)
description In order to determine the structure and biomass of phytoplankton (picophytoplankton, nanodiatoms, and microdiatoms) under oligotrophic conditions, a study was carried out in the surface layer of the Guaymas Basin, Gulf of California, during the late summer of 2016. This study included the measurement of hydrographic, chemical, and biological variables in the surface layer of the study area. Our results showed a warm, strongly stratified, and nutrient-depleted water column associated with reduced phytoplankton biomass (<1 mg Chla·m–3). The average ratios of N:P (0.55 ± 1.34), N:Si (0.13 ± 0.18), and Fe:N (52.70 ± 29.70) indicate N-limiting conditions. The biomass contribution of phytoplankton groups fluctuated widely by depth level, with predominance of picophytoplankton (85.0 ± 2.7%) at the surface (5 m) and nano-microdiatoms (91.5 ± 5.9%) at the deepest level (35–40 m), adjacent to the thermocline. Diatoms dominated the integrated biomass between the surface and 50-m depth, with an average contribution ~6 times greater than that of picophytoplankton. Despite the ideal conditions for the proliferation of diazotrophs, the presence of Trichodesmium spp. and Richelia intracellularis was very irregular and in relatively low abundances (2,220 ± 1,575 cell·L–1). Our results are especially relevant as they suggest that, under N-limiting conditions, the paradigm of high biomass and large cell dominance in the Gulf of California may be challenged during the summer season.
publisher Iniversidad Autónoma de Baja California
publishDate 2023
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3302
_version_ 1792095480131354624
spelling oai:cienciasmarinas.com.mx:article-33022024-02-08T22:54:21Z Phytoplankton composition and biomass under oligotrophic conditions in the Guaymas Basin (Gulf of California) Composición y biomasa fitoplanctónica bajo condiciones oligotróficas en la cuenca de Guaymas (golfo de California) Millán-Nuñez, Eduardo Delgadillo-Hinojosa, Francisco Hakspiel-Segura, Cristian Torres-Delgado, Eunise Vanessa Félix-Bermúdez, Armando Segovia-Zavala, José Antonio Camacho-Ibar, Víctor Froylán Munoz-Barbosa, Albino Gulf of California oligotrophy picophytoplankton phytoplankton biomass diazotrophs golfo de California oligotrofía picofitoplancton biomasa fitoplantónica diazótrofos In order to determine the structure and biomass of phytoplankton (picophytoplankton, nanodiatoms, and microdiatoms) under oligotrophic conditions, a study was carried out in the surface layer of the Guaymas Basin, Gulf of California, during the late summer of 2016. This study included the measurement of hydrographic, chemical, and biological variables in the surface layer of the study area. Our results showed a warm, strongly stratified, and nutrient-depleted water column associated with reduced phytoplankton biomass (<1 mg Chla·m–3). The average ratios of N:P (0.55 ± 1.34), N:Si (0.13 ± 0.18), and Fe:N (52.70 ± 29.70) indicate N-limiting conditions. The biomass contribution of phytoplankton groups fluctuated widely by depth level, with predominance of picophytoplankton (85.0 ± 2.7%) at the surface (5 m) and nano-microdiatoms (91.5 ± 5.9%) at the deepest level (35–40 m), adjacent to the thermocline. Diatoms dominated the integrated biomass between the surface and 50-m depth, with an average contribution ~6 times greater than that of picophytoplankton. Despite the ideal conditions for the proliferation of diazotrophs, the presence of Trichodesmium spp. and Richelia intracellularis was very irregular and in relatively low abundances (2,220 ± 1,575 cell·L–1). Our results are especially relevant as they suggest that, under N-limiting conditions, the paradigm of high biomass and large cell dominance in the Gulf of California may be challenged during the summer season. Con el propósito de determinar la biomasa y la composición del fitoplancton (picofitoplancton, nanodiatomeas y microdiatomeas) bajo condiciones oligotróficas, se realizó un estudio en la capa superficial de la cuenca de Guaymas, golfo de California, durante el verano tardío de 2016. El estudio contempló la medición de variables hidrográficas, químicas y biológicas en la capa superficial del área de estudio. Nuestros resultados mostraron una columna de agua cálida, fuertemente estratificada, empobrecida en nutrientes y con biomasas fitoplanctónicas reducidas (<1 mg Cla·m–3). Los cocientes promedio de N:P (0.55 ± 1.34), N:Si (0.13 ± 0.18) y Fe:N (52.70 ± 29.70) indicaron condiciones de limitación por N. La contribución de los grupos fitoplanctónicos a la biomasa fluctuó ampliamente por nivel de profundidad, y se observó  el predominio del picofitoplancton (85.0 ± 2.7%) en superficie (5 m) y de las nano-microdiatomeas (91.5 ± 5.9%) en el nivel más profundo (35-40 m), adyacente a la termoclina. Las diatomeas dominaron la biomasa integrada entre la superficie y 50 m de profundidad, con una contribución promedio ~6 veces mayor que la del picofitoplancton. A pesar de que se registraron condiciones ideales para la proliferación de cianobacterias diazótrofas, la presencia de Trichodesmium spp. y Richelia intracellularis fue muy irregular y en abundancias relativamente bajas (2,220 ± 1,575 célula·L–1). Nuestros resultados son especialmente relevantes, ya que sugieren que, bajo condiciones de limitación por N, el paradigma de la alta biomasa y dominancia de células grandes en el golfo de California puede verse desafiado durante la temporada de verano. Iniversidad Autónoma de Baja California 2023-03-17 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/3302 10.7773/cm.y2023.3302 Ciencias Marinas; Vol. 49 (2023) Ciencias Marinas; Vol. 49 (2023) 2395-9053 0185-3880 eng spa https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3302/420420715 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3302/420420846 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3302/420420847 Copyright (c) 2023 Eduardo Millán-Nuñez, Francisco Delgadillo-Hinojosa, Cristian Hakspiel-Segura, Eunise Vanessa Torres-Delgado, Armando Félix-Bermúdez, José Antonio Segovia-Zavala, Víctor Froylán Camacho-Ibar, Albino Munoz-Barbosa https://creativecommons.org/licenses/by/4.0

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