Use of intertidal macroalgae as bioindicators of anthropogenic nutrient disturbance in the rocky coasts of the tropical central Mexican Pacific

Use of intertidal macroalgae as bioindicators of anthropogenic nutrient disturbance in the rocky coasts of the tropical central Mexican Pacific

Bahía de Zihuatanejo, Mexico, exhibits disturbances in its rocky shores due to large amounts of nutrients that enter the sea due to urbanization and mass tourism. These nutrients are traced in macroalgae using stable isotopes. The objective of this study was to use 4 species of macroalgae as bioindi...

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Autores principales: Vergara-Carranza, Careli, López, Norma, Piñón-Gimate, Alejandra
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Lenguaje:eng
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Publicado: Iniversidad Autónoma de Baja California 2024
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3416
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institution Ciencias Marinas
collection OJS
language eng
spa
format Online
author Vergara-Carranza, Careli
López, Norma
Piñón-Gimate, Alejandra
spellingShingle Vergara-Carranza, Careli
López, Norma
Piñón-Gimate, Alejandra
Use of intertidal macroalgae as bioindicators of anthropogenic nutrient disturbance in the rocky coasts of the tropical central Mexican Pacific
author_facet Vergara-Carranza, Careli
López, Norma
Piñón-Gimate, Alejandra
author_sort Vergara-Carranza, Careli
title Use of intertidal macroalgae as bioindicators of anthropogenic nutrient disturbance in the rocky coasts of the tropical central Mexican Pacific
title_short Use of intertidal macroalgae as bioindicators of anthropogenic nutrient disturbance in the rocky coasts of the tropical central Mexican Pacific
title_full Use of intertidal macroalgae as bioindicators of anthropogenic nutrient disturbance in the rocky coasts of the tropical central Mexican Pacific
title_fullStr Use of intertidal macroalgae as bioindicators of anthropogenic nutrient disturbance in the rocky coasts of the tropical central Mexican Pacific
title_full_unstemmed Use of intertidal macroalgae as bioindicators of anthropogenic nutrient disturbance in the rocky coasts of the tropical central Mexican Pacific
title_sort use of intertidal macroalgae as bioindicators of anthropogenic nutrient disturbance in the rocky coasts of the tropical central mexican pacific
description Bahía de Zihuatanejo, Mexico, exhibits disturbances in its rocky shores due to large amounts of nutrients that enter the sea due to urbanization and mass tourism. These nutrients are traced in macroalgae using stable isotopes. The objective of this study was to use 4 species of macroalgae as bioindicators to infer nutrient sources in the system through δ15N and the elemental nitrogen (N) content. Samples were collected in the rainy and dry seasons of 2021 at 3 sites in the Zihuatanejo region: La Madera, Las Salinas, and La Majahua. Water samples were taken at each site and season to determine nitrate (NO3) and phosphate (PO4) concentrations. Isotopic signals and N content were evaluated in Hypnea spinella, Padina gymnospora, Ulva intestinalis, and Ulva lactuca for each site and season. The concentrations of NO3 and PO4, which were highest at Las Salinas and showed no differences between La Madera and La Majahua, were similar to those previously reported for the region. The highest δ15N signals were found in U. intestinalis and H. spinella at Las Salinas (16.12‰ and 15.38‰, respectively) and La Madera (15.12‰ and 13.58‰, respectively) and were close to the isotopic wastewater signal. In La Majahua, low signals were obtained for H. spinella (13.54‰), P. gymnospora (9.24‰), and U. lactuca (8.24‰), with values that were close to the isotopic signal of nutrient-rich oceanic waters. The N content varied depending on the species and site, although it was generally higher at Las Salinas. The isotopic signals agreed with those reported for anthropogenic and natural nutrient-enriched coasts. The species U. intestinalis and H. spinella can be used as bioindicators of anthropogenic disturbance due to sewage discharge in the region.
publisher Iniversidad Autónoma de Baja California
publishDate 2024
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3416
_version_ 1797332414445387776
spelling oai:cienciasmarinas.com.mx:article-34162024-04-08T20:28:53Z Use of intertidal macroalgae as bioindicators of anthropogenic nutrient disturbance in the rocky coasts of the tropical central Mexican Pacific Uso de macroalgas intermareales como bioindicadores de disturbio antropogénico por nutrientes en las costas rocosas del Pacífico mexicano central tropical Vergara-Carranza, Careli López, Norma Piñón-Gimate, Alejandra Macroalgae Bioindicators Stable isotopes Contamination Tropical Mexican Pacific Macroalgas Bioindicadores Isótopos estables Contaminación Pacífico tropical mexicano Bahía de Zihuatanejo, Mexico, exhibits disturbances in its rocky shores due to large amounts of nutrients that enter the sea due to urbanization and mass tourism. These nutrients are traced in macroalgae using stable isotopes. The objective of this study was to use 4 species of macroalgae as bioindicators to infer nutrient sources in the system through δ15N and the elemental nitrogen (N) content. Samples were collected in the rainy and dry seasons of 2021 at 3 sites in the Zihuatanejo region: La Madera, Las Salinas, and La Majahua. Water samples were taken at each site and season to determine nitrate (NO3) and phosphate (PO4) concentrations. Isotopic signals and N content were evaluated in Hypnea spinella, Padina gymnospora, Ulva intestinalis, and Ulva lactuca for each site and season. The concentrations of NO3 and PO4, which were highest at Las Salinas and showed no differences between La Madera and La Majahua, were similar to those previously reported for the region. The highest δ15N signals were found in U. intestinalis and H. spinella at Las Salinas (16.12‰ and 15.38‰, respectively) and La Madera (15.12‰ and 13.58‰, respectively) and were close to the isotopic wastewater signal. In La Majahua, low signals were obtained for H. spinella (13.54‰), P. gymnospora (9.24‰), and U. lactuca (8.24‰), with values that were close to the isotopic signal of nutrient-rich oceanic waters. The N content varied depending on the species and site, although it was generally higher at Las Salinas. The isotopic signals agreed with those reported for anthropogenic and natural nutrient-enriched coasts. The species U. intestinalis and H. spinella can be used as bioindicators of anthropogenic disturbance due to sewage discharge in the region. La Bahía de Zihuatanejo, México, presenta disturbios en sus costas rocosas debido a la cantidad de nutrientes que llegan al mar por la urbanización y el turismo masivo. Estos nutrientes han sido trazados por las macroalgas mediante el uso de isótopos estables. El objetivo de este trabajo fue utilizar 4 especies de macroalgas como bioindicadores para inferir las fuentes de nutrientes al sistema a través de la señal de δ15N y el contenido elemental de nitrógeno (N). Se realizaron 2 muestreos en las temporadas de lluvias y secas de 2021 en 3 localidades en la región: La Madera, Las Salinas y La Majahua. Se tomaron muestras de agua por localidad y temporada para determinar las concentraciones de nitratos (NO3) y fosfatos (PO4) y se evaluaron las señales isotópicas y el contenido de N en Hypnea spinella, Padina gymnospora, Ulva intestinalis y Ulva lactuca. Las concentraciones de NO3 y PO4 fueron más altas en Las Salinas, no presentaron diferencias entre La Madera y La Majahua y fueron similares a las reportadas previamente para la región. Las señales más altas de δ15N se encontraron en H. spinella y U. intestinalis en Las Salinas (16.12‰ y 15.38‰, respectivamente) y La Madera (15.12‰ y 13.58‰, respectivamente) y resultaron cercanas a la señal isotópica de aguas residuales. En La Majahua, se obtuvieron señales bajas para H. spinella (13.54‰), P. gymnospora (9.24‰) y U. lactuca (8.24‰), cuyos valores resultaron cercanos a la señal isotópica de aguas oceánicas ricas en nutrientes. El contenido de N varió dependiendo de la especie y la localidad, siendo más alto en Las Salinas. Las señales isotópicas encontradas coinciden con aquellas reportadas para costas enriquecidas con nutrientes de tipo antropogénico y natural. Hypnea spinella y U. intestinalis pueden ser empleadas como bioindicadores de disturbio antropogénico debido a la descarga de aguas residuales. Iniversidad Autónoma de Baja California 2024-03-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3416 10.7773/cm.y2024.3416 Ciencias Marinas; Vol. 50 (2024): Current publications Ciencias Marinas; Vol. 50 (2024): Publicaciones actuales 2395-9053 0185-3880 eng spa https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3416/420421029 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3416/420421028 Copyright (c) 2024 Careli Vergara-Carranza, Norma López, Alejandra Piñón-Gimate https://creativecommons.org/licenses/by/4.0

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