Suitable habitat for marine mammals during austral summer in San Jorge Gulf, Argentina

The San Jorge Gulf (SJG) is an important oceanographic region due to the influence of two tidal fronts, being one of the most productive sectors and with greater marine biodiversity in the Argentine Sea. The aim of this study was to identify which oceanographic variables best explained the presence...

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Autores principales:	Retana,María Valeria, Lewis,Mirtha Noemí
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2017
Materias:	Distribution models tidal fronts marine mammals Maxent San Jorge Gulf
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572017000200007
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spelling	oai:scielo:S0718-195720170002000072017-09-06Suitable habitat for marine mammals during austral summer in San Jorge Gulf, ArgentinaRetana,María ValeriaLewis,Mirtha Noemí Distribution models tidal fronts marine mammals Maxent San Jorge Gulf The San Jorge Gulf (SJG) is an important oceanographic region due to the influence of two tidal fronts, being one of the most productive sectors and with greater marine biodiversity in the Argentine Sea. The aim of this study was to identify which oceanographic variables best explained the presence of marine mammals and to explore the overlap of the predicted richness with the frontal areas of the SJG during the austral summer. The potential distribution of 9 species (Balaenoptera sp., Cephalorhynchus commersonii, Globicephala melas, Grampus griseus, Lagenorhynchus australis, L. obscurus, Mirounga leonina, Orcinus orca, Otaria flavescens) was modeled with Maxent using 6 environmental variables (bathymetry, seafloor slope, distance to the coast, distance to the frontal area, sea surface temperature and chlorophyll a concentration). Marine mammals were found closer to the frontal area than expected by chance (9.48 km and 13.34 km, respectively). Bathymetry, distance to the coast and seafloor slope were the most important variables in the distribution of all the species. Balaenoptera sp., G. melas, G. griseus, L. australis and O. orca showed a coastal distribution (<10 km), mainly in the northwest of the gulf. The distribution of M. leonina, O. flavescens and C. commersonii followed the isobaths of 80 m, while L. obscurus evenly distributed throughout the gulf. In general, the environmental variables that influence the distribution of these species agreed with those found in previous studies from other locations. The area of high predicted richness was 75% overlapped with the frontal areas located in the northwest and southeast of the gulf. This work provides baseline information for designing future samplings that could explain the influence of the processes and the seasonal variation of the distribution of the marine mammals of the SGJ.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.52 n.2 20172017-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572017000200007en10.4067/S0718-19572017000200007
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Distribution models tidal fronts marine mammals Maxent San Jorge Gulf
spellingShingle	Distribution models tidal fronts marine mammals Maxent San Jorge Gulf Retana,María Valeria Lewis,Mirtha Noemí Suitable habitat for marine mammals during austral summer in San Jorge Gulf, Argentina
description	The San Jorge Gulf (SJG) is an important oceanographic region due to the influence of two tidal fronts, being one of the most productive sectors and with greater marine biodiversity in the Argentine Sea. The aim of this study was to identify which oceanographic variables best explained the presence of marine mammals and to explore the overlap of the predicted richness with the frontal areas of the SJG during the austral summer. The potential distribution of 9 species (Balaenoptera sp., Cephalorhynchus commersonii, Globicephala melas, Grampus griseus, Lagenorhynchus australis, L. obscurus, Mirounga leonina, Orcinus orca, Otaria flavescens) was modeled with Maxent using 6 environmental variables (bathymetry, seafloor slope, distance to the coast, distance to the frontal area, sea surface temperature and chlorophyll a concentration). Marine mammals were found closer to the frontal area than expected by chance (9.48 km and 13.34 km, respectively). Bathymetry, distance to the coast and seafloor slope were the most important variables in the distribution of all the species. Balaenoptera sp., G. melas, G. griseus, L. australis and O. orca showed a coastal distribution (<10 km), mainly in the northwest of the gulf. The distribution of M. leonina, O. flavescens and C. commersonii followed the isobaths of 80 m, while L. obscurus evenly distributed throughout the gulf. In general, the environmental variables that influence the distribution of these species agreed with those found in previous studies from other locations. The area of high predicted richness was 75% overlapped with the frontal areas located in the northwest and southeast of the gulf. This work provides baseline information for designing future samplings that could explain the influence of the processes and the seasonal variation of the distribution of the marine mammals of the SGJ.
author	Retana,María Valeria Lewis,Mirtha Noemí
author_facet	Retana,María Valeria Lewis,Mirtha Noemí
author_sort	Retana,María Valeria
title	Suitable habitat for marine mammals during austral summer in San Jorge Gulf, Argentina
title_short	Suitable habitat for marine mammals during austral summer in San Jorge Gulf, Argentina
title_full	Suitable habitat for marine mammals during austral summer in San Jorge Gulf, Argentina
title_fullStr	Suitable habitat for marine mammals during austral summer in San Jorge Gulf, Argentina
title_full_unstemmed	Suitable habitat for marine mammals during austral summer in San Jorge Gulf, Argentina
title_sort	suitable habitat for marine mammals during austral summer in san jorge gulf, argentina
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2017
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572017000200007
work_keys_str_mv	AT retanamariavaleria suitablehabitatformarinemammalsduringaustralsummerinsanjorgegulfargentina AT lewismirthanoemi suitablehabitatformarinemammalsduringaustralsummerinsanjorgegulfargentina
_version_	1714202370004484096

Suitable habitat for marine mammals during austral summer in San Jorge Gulf, Argentina

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