Influence of environmental variability on the distribution and abundance of the pantropical spotted dolphin (Stenella attenuata) in the Mexican Central Pacific

Influence of environmental variability on the distribution and abundance of the pantropical spotted dolphin (Stenella attenuata) in the Mexican Central Pacific

The Mexican Central Pacific (MCP) has complex oceanographic dynamics, with a well-defined seasonal pattern and influence of interannual sea surface temperature anomalies. The present study investigated the relationship between the distribution/abundance of spotted dolphins and the environmental cond...

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Autores principales: Díaz-Torres, Evelyn R, Marín-Enríquez, Emigdio, Corgos, Antonio, Olivos-Ortiz, Aramis, Ortega-Ortiz, Christian D
Formato: Online
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/3215
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language eng
spa
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author Díaz-Torres, Evelyn R
Marín-Enríquez, Emigdio
Corgos, Antonio
Olivos-Ortiz, Aramis
Ortega-Ortiz, Christian D
spellingShingle Díaz-Torres, Evelyn R
Marín-Enríquez, Emigdio
Corgos, Antonio
Olivos-Ortiz, Aramis
Ortega-Ortiz, Christian D
Influence of environmental variability on the distribution and abundance of the pantropical spotted dolphin (Stenella attenuata) in the Mexican Central Pacific
author_facet Díaz-Torres, Evelyn R
Marín-Enríquez, Emigdio
Corgos, Antonio
Olivos-Ortiz, Aramis
Ortega-Ortiz, Christian D
author_sort Díaz-Torres, Evelyn R
title Influence of environmental variability on the distribution and abundance of the pantropical spotted dolphin (Stenella attenuata) in the Mexican Central Pacific
title_short Influence of environmental variability on the distribution and abundance of the pantropical spotted dolphin (Stenella attenuata) in the Mexican Central Pacific
title_full Influence of environmental variability on the distribution and abundance of the pantropical spotted dolphin (Stenella attenuata) in the Mexican Central Pacific
title_fullStr Influence of environmental variability on the distribution and abundance of the pantropical spotted dolphin (Stenella attenuata) in the Mexican Central Pacific
title_full_unstemmed Influence of environmental variability on the distribution and abundance of the pantropical spotted dolphin (Stenella attenuata) in the Mexican Central Pacific
title_sort influence of environmental variability on the distribution and abundance of the pantropical spotted dolphin (stenella attenuata) in the mexican central pacific
description The Mexican Central Pacific (MCP) has complex oceanographic dynamics, with a well-defined seasonal pattern and influence of interannual sea surface temperature anomalies. The present study investigated the relationship between the distribution/abundance of spotted dolphins and the environmental conditions in the MCP. Dolphin sighting data were collected during January 2010–December 2015; distance to coast, sea surface temperature, and chlorophyll a (Chla) were obtained for each sighting location through georeferenced maps and satellite images. A total of 746 spotted dolphin sightings were obtained with a survey effort of 31,695 km. Spotted dolphins in the MCP showed a predominantly coastal distribution regardless of environmental conditions. Significant differences were detected concerning regional seasonal variation, with higher mean sighting rate during the stratified periods and higher density/abundance estimates during the mixed periods. Spotted dolphins showed preference for warmer conditions, with higher mean sighting rate, abundance, and distance to coast during the neutral and warm interannual periods. During the coolest conditions (cold periods), mean sighting rate and abundance decreased and spotted dolphins were located closer to the coast, where Chla concentration increased. These results suggest that changes in the distribution/abundance of these dolphins could be associated with habitat quality related to tropical (El Niño/Southern Oscillation) and extratropical (The Blob) oceanographic phenomena, which could be modulating their foraging activities.
publisher Iniversidad Autónoma de Baja California
publishDate 2022
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3215
_version_ 1792095474997526528
spelling oai:cienciasmarinas.com.mx:article-32152023-12-20T18:01:39Z Influence of environmental variability on the distribution and abundance of the pantropical spotted dolphin (Stenella attenuata) in the Mexican Central Pacific Influencia de la variabilidad ambiental sobre la distribución y la abundancia del delfín moteado pantropical (Stenella attenuata) en el Pacífico central mexicano Díaz-Torres, Evelyn R Marín-Enríquez, Emigdio Corgos, Antonio Olivos-Ortiz, Aramis Ortega-Ortiz, Christian D odontocetes El Niño The Blob sea surface temperature chlorophyll a odontocetos El Niño "El Blob" temperatura superficial del mar clorofila a The Mexican Central Pacific (MCP) has complex oceanographic dynamics, with a well-defined seasonal pattern and influence of interannual sea surface temperature anomalies. The present study investigated the relationship between the distribution/abundance of spotted dolphins and the environmental conditions in the MCP. Dolphin sighting data were collected during January 2010–December 2015; distance to coast, sea surface temperature, and chlorophyll a (Chla) were obtained for each sighting location through georeferenced maps and satellite images. A total of 746 spotted dolphin sightings were obtained with a survey effort of 31,695 km. Spotted dolphins in the MCP showed a predominantly coastal distribution regardless of environmental conditions. Significant differences were detected concerning regional seasonal variation, with higher mean sighting rate during the stratified periods and higher density/abundance estimates during the mixed periods. Spotted dolphins showed preference for warmer conditions, with higher mean sighting rate, abundance, and distance to coast during the neutral and warm interannual periods. During the coolest conditions (cold periods), mean sighting rate and abundance decreased and spotted dolphins were located closer to the coast, where Chla concentration increased. These results suggest that changes in the distribution/abundance of these dolphins could be associated with habitat quality related to tropical (El Niño/Southern Oscillation) and extratropical (The Blob) oceanographic phenomena, which could be modulating their foraging activities. El Pacífico central mexicano (PCM) presenta una dinámica oceanográfica compleja, con un patrón de variación estacional bien definido e influencia de anomalías interanuales de la temperatura de la superficie del mar. El presente estudio investigó la relación entre la distribución/abundancia de delfines moteados y las condiciones ambientales del PCM. Los datos de avistamiento de delfines se recopilaron entre enero de 2010 y diciembre de 2015; la distancia a la costa, la temperatura de la superficie del mar y la clorofila a (Cla) se obtuvieron para cada lugar de avistamiento a través de mapas georreferenciados e imágenes de satélite. Se obtuvieron un total de 746 avistamientos de delfines moteados con un esfuerzo de prospección de 31,695 km. Los delfines moteados en el PCM mostraron una distribución predominantemente costera independientemente de las condiciones ambientales. Se observaron diferencias significativas entorno a la variación estacional de la región, con una tasa media de avistamiento más alta durante los periodos estratificados y estimaciones de densidad/abundancia más altas durante los periodos de mezcla. Los delfines moteados mostraron una preferencia por las condiciones más cálidas, con una mayor tasa media de avistamiento, abundancia y distancia a la costa durante los periodos interanuales neutrales y cálidos. Durante las condiciones más frescas (periodos fríos), la tasa media de avistamiento y la abundancia disminuyeron, y los delfines moteados se ubicaron más cerca de la costa, donde aumentó la concentración de Cla. Estos resultados sugieren que los cambios en la distribución/abundancia de estos delfines podrían estar asociados con fenómenos oceanográficos tropicales (El Niño/Oscilación del Sur) y extra tropicales (“El Blob”), que podrían estar modulando sus actividades de alimentación. Iniversidad Autónoma de Baja California 2022-03-31 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/3215 10.7773/cm.y2022.3215 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/3215/420420683 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3215/420420911 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3215/420420912 Copyright (c) 2022 Ciencias Marinas https://creativecommons.org/licenses/by/4.0

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