Current status of the California sea lion ( Zalophus californianus) and the northern elephant seal (Mirounga angustirostris) at the San Benito Archipelago, Mexico
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Redalyc · Ciencias Marinas
The California sea lion (CSL) and the northern elephant seal (NES) are the two most abundant pinniped species inhabiting the San Benito Archipelago (Baja California, Mexico). This study reports the results of the first survey to gather abundance information from continuous breeding seasons (2012–201...
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Autónoma de Baja California
2015
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| _version_ | 1878325300171898880 |
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| author | Fernando R Elorriaga-Verplancken |
| author_facet | Fernando R Elorriaga-Verplancken |
| collection | Ciencias Marinas |
| container_title | Ciencias Marinas |
| contents | Current status of the California sea lion ( Zalophus californianus) and the northern elephant seal (Mirounga angustirostris) at the San Benito Archipelago, Mexico Fernando R Elorriaga-Verplancken Giulia Ferretto Olivia C Angell Ciencias de la Tierra abundance Baja Cali fornia California sea lions San Benito Archipel ago northern ele phant seals The California sea lion (CSL) and the north ern elephant seal (NES) ar e the two most abundant pinni ped species inhabiting the S an Benito Archipelago (Baja Californ ia, Mexico). This study reports the results of the first survey to gather abundance informatio n from continuous breeding seasons (2012–2015) and over the course of a single year (2014). Rela tive to the previous year, the abundan ce of CSLs declined in July 2014; however, based on historical censuses, the colony at th e archipelago was catalogue d as “stable”. Intra-a nnually, the CSL abundance was regulated by pups and adult females, which re ached their peak during the breedi ng season (July). Moreover, we hyp othesize that subadult males from the west coast of Baja California enter the Gulf of California. The NES fluctuations were most affected by the breeding season (February), when the number of pups and adult females peaked, and by the important presence of juveniles in May and Sept ember. The NES colony at the archipelago wa s catalogued as “in decline”, ba sed on previous countings. This high-resolution survey compleme nts past and future studies in the region, and adds a nother dimension to our understanding of th ese species, which is largely based on infor mation from their main rookeries in California. 2015 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48043157002 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.41 |
| ctrlnum | oai:cienciasmarinas.com.mx:article/2545 10.7773/cm.v41i4.2545 |
| description | The California sea lion (CSL) and the northern elephant seal (NES) are the two most abundant pinniped species inhabiting the San Benito Archipelago (Baja California, Mexico). This study reports the results of the first survey to gather abundance information from continuous breeding seasons (2012–2015) and over the course of a single year (2014). Relative to the previous year, the abundance of CSLs declined in July 2014; however, based on historical censuses, the colony at the archipelago was catalogued as “stable”. Intra-annually, the CSL abundance was regulated by pups and adult females, which reached their peak during the breeding season (July). Moreover, we hypothesize that subadult males from the west coast of Baja California enter the Gulf of California. The NES fluctuations were most affected by the breeding season (February), when the number of pups and adult females peaked, and by the important presence of juveniles in May and September. The NES colony at the archipelago was catalogued as “in decline”, based on previous countings. This high-resolution survey complements past and future studies in the region, and adds another dimension to our understanding of these species, which is largely based on information from their main rookeries in California.
El lobo marino de California (LMC) y el elefante marino del norte (EMN) son los dos pinnípedos más abundantes del archipiélago San Benito (Baja California, México). Este estudio reporta los resultados del primer monitoreo que reúne información de temporadas reproductivas continuas (2012–2015) y a lo largo de un año (2014). La abundancia de LMC declinó en julio de 2014, en comparación con el año previo; sin embargo, la colonia del archipiélago se catalogó como “estable”, tomando como base censos históricos. Intraanualmente, la abundancia del LMC fue regulada por crías y hembras adultas, las cuales alcanzaron su pico durante la temporada reproductiva (julio). Adicionalmente, se apoya la hipótesis de que machos subadultos de la costa occidental de Baja California ingresan al golfo de California. Las fluctuaciones del EMN fueron afectadas principalmente por la temporada de reproducción (febrero), cuando se presentó un pico de crías y hembras adultas, así como por la presencia importante de juveniles en mayo y septiembre. El EMN del archipiélago se catalogó como “en declive” con base en conteos de años anteriores. Este monitoreo de alta resolución se complementa con estudios pasados y futuros, y agrega otra dimensión a nuestro entendimiento de estas especies, el cual se basa mayoritariamente en las colonias principales que se ubican en California. |
| format | Artículo científico |
| id | redalyc_48043157002 |
| institution | Redalyc Ciencias Marinas |
| language | en |
| publishDate | 2015 |
| publisher | Universidad Autónoma de Baja California |
| spelling | Current status of the California sea lion (Zalophus californianus) and the northern elephant seal (Mirounga angustirostris) at the San Benito Archipelago, Mexico Estado actual del lobo marino de California (Zalophus californianus) y el elefante marino del norte (Mirounga angustirostris) en el archipiélago San Benito, México Elorriaga-Verplancken, Fernando R Ferretto, Giulia Angell, Olivia C California sea lions northern elephant seals San Benito Archipelago Baja California abundance lobos marinos de California elefantes marinos del norte archipiélago San Benito Baja California abundancia The California sea lion (CSL) and the northern elephant seal (NES) are the two most abundant pinniped species inhabiting the San Benito Archipelago (Baja California, Mexico). This study reports the results of the first survey to gather abundance information from continuous breeding seasons (2012–2015) and over the course of a single year (2014). Relative to the previous year, the abundance of CSLs declined in July 2014; however, based on historical censuses, the colony at the archipelago was catalogued as “stable”. Intra-annually, the CSL abundance was regulated by pups and adult females, which reached their peak during the breeding season (July). Moreover, we hypothesize that subadult males from the west coast of Baja California enter the Gulf of California. The NES fluctuations were most affected by the breeding season (February), when the number of pups and adult females peaked, and by the important presence of juveniles in May and September. The NES colony at the archipelago was catalogued as “in decline”, based on previous countings. This high-resolution survey complements past and future studies in the region, and adds another dimension to our understanding of these species, which is largely based on information from their main rookeries in California. El lobo marino de California (LMC) y el elefante marino del norte (EMN) son los dos pinnípedos más abundantes del archipiélago San Benito (Baja California, México). Este estudio reporta los resultados del primer monitoreo que reúne información de temporadas reproductivas continuas (2012–2015) y a lo largo de un año (2014). La abundancia de LMC declinó en julio de 2014, en comparación con el año previo; sin embargo, la colonia del archipiélago se catalogó como “estable”, tomando como base censos históricos. Intraanualmente, la abundancia del LMC fue regulada por crías y hembras adultas, las cuales alcanzaron su pico durante la temporada reproductiva (julio). Adicionalmente, se apoya la hipótesis de que machos subadultos de la costa occidental de Baja California ingresan al golfo de California. Las fluctuaciones del EMN fueron afectadas principalmente por la temporada de reproducción (febrero), cuando se presentó un pico de crías y hembras adultas, así como por la presencia importante de juveniles en mayo y septiembre. El EMN del archipiélago se catalogó como “en declive” con base en conteos de años anteriores. Este monitoreo de alta resolución se complementa con estudios pasados y futuros, y agrega otra dimensión a nuestro entendimiento de estas especies, el cual se basa mayoritariamente en las colonias principales que se ubican en California. Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas 2015-12-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/2545 10.7773/cm.v41i4.2545 Ciencias Marinas; Vol. 41 No. 4 (2015); 269-281 Ciencias Marinas; Vol. 41 Núm. 4 (2015); 269-281 2395-9053 0185-3880 eng https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/2545/1571 Copyright (c) 2015 Ciencias Marinas https://creativecommons.org/licenses/by/4.0 ['Redalyc'] redalyc_48043157002 Current status of the California sea lion ( Zalophus californianus) and the northern elephant seal (Mirounga angustirostris) at the San Benito Archipelago, Mexico ['Current status of the California sea lion ( Zalophus californianus) and the northern elephant seal (Mirounga angustirostris) at the San Benito Archipelago, Mexico', 'Fernando R Elorriaga-Verplancken', 'Ciencias de la Tierra', 'abundance', 'Baja Cali fornia', 'California sea lions', 'San Benito Archipel ago', 'northern ele phant seals', 'Current status of the California sea lion ( Zalophus californianus) and the northern elephant seal (Mirounga angustirostris) at the San Benito Archipelago, Mexico Fernando R Elorriaga-Verplancken Giulia Ferretto Olivia C Angell Ciencias de la Tierra abundance Baja Cali fornia California sea lions San Benito Archipel ago northern ele phant seals The California sea lion (CSL) and the north ern elephant seal (NES) ar e the two most abundant pinni ped species inhabiting the S an Benito Archipelago (Baja Californ ia, Mexico). This study reports the results of the first survey to gather abundance informatio n from continuous breeding seasons (2012–2015) and over the course of a single year (2014). Rela tive to the previous year, the abundan ce of CSLs declined in July 2014; however, based on historical censuses, the colony at th e archipelago was catalogue d as “stable”. Intra-a nnually, the CSL abundance was regulated by pups and adult females, which re ached their peak during the breedi ng season (July). Moreover, we hyp othesize that subadult males from the west coast of Baja California enter the Gulf of California. The NES fluctuations were most affected by the breeding season (February), when the number of pups and adult females peaked, and by the important presence of juveniles in May and Sept ember. The NES colony at the archipelago wa s catalogued as “in decline”, ba sed on previous countings. This high-resolution survey compleme nts past and future studies in the region, and adds a nother dimension to our understanding of th ese species, which is largely based on infor mation from their main rookeries in California. 2015 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48043157002 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.41'] ['Fernando R Elorriaga-Verplancken'] ['Fernando R Elorriaga-Verplancken'] ['Artículo científico'] ['2015'] ['Universidad Autónoma de Baja California'] ['en'] ['Ciencias de la Tierra', 'abundance', 'Baja Cali fornia', 'California sea lions', 'San Benito Archipel ago', 'northern ele phant seals'] ['https://www.redalyc.org/articulo.oa?id=48043157002'] ['Current status of the California sea lion ( Zalophus californianus) and the northern elephant seal (Mirounga angustirostris) at the San Benito Archipelago, Mexico Fernando R Elorriaga-Verplancken Giulia Ferretto Olivia C Angell Ciencias de la Tierra abundance Baja Cali fornia California sea lions San Benito Archipel ago northern ele phant seals The California sea lion (CSL) and the north ern elephant seal (NES) ar e the two most abundant pinni ped species inhabiting the S an Benito Archipelago (Baja Californ ia, Mexico). This study reports the results of the first survey to gather abundance informatio n from continuous breeding seasons (2012–2015) and over the course of a single year (2014). Rela tive to the previous year, the abundan ce of CSLs declined in July 2014; however, based on historical censuses, the colony at th e archipelago was catalogue d as “stable”. Intra-a nnually, the CSL abundance was regulated by pups and adult females, which re ached their peak during the breedi ng season (July). Moreover, we hyp othesize that subadult males from the west coast of Baja California enter the Gulf of California. The NES fluctuations were most affected by the breeding season (February), when the number of pups and adult females peaked, and by the important presence of juveniles in May and Sept ember. The NES colony at the archipelago wa s catalogued as “in decline”, ba sed on previous countings. This high-resolution survey compleme nts past and future studies in the region, and adds a nother dimension to our understanding of th ese species, which is largely based on infor mation from their main rookeries in California. 2015 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48043157002 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.41'] |
| spellingShingle | Current status of the California sea lion ( Zalophus californianus) and the northern elephant seal (Mirounga angustirostris) at the San Benito Archipelago, Mexico Fernando R Elorriaga-Verplancken Ciencias de la Tierra abundance Baja Cali fornia California sea lions San Benito Archipel ago northern ele phant seals Current status of the California sea lion ( Zalophus californianus) and the northern elephant seal (Mirounga angustirostris) at the San Benito Archipelago, Mexico Fernando R Elorriaga-Verplancken Giulia Ferretto Olivia C Angell Ciencias de la Tierra abundance Baja Cali fornia California sea lions San Benito Archipel ago northern ele phant seals The California sea lion (CSL) and the north ern elephant seal (NES) ar e the two most abundant pinni ped species inhabiting the S an Benito Archipelago (Baja Californ ia, Mexico). This study reports the results of the first survey to gather abundance informatio n from continuous breeding seasons (2012–2015) and over the course of a single year (2014). Rela tive to the previous year, the abundan ce of CSLs declined in July 2014; however, based on historical censuses, the colony at th e archipelago was catalogue d as “stable”. Intra-a nnually, the CSL abundance was regulated by pups and adult females, which re ached their peak during the breedi ng season (July). Moreover, we hyp othesize that subadult males from the west coast of Baja California enter the Gulf of California. The NES fluctuations were most affected by the breeding season (February), when the number of pups and adult females peaked, and by the important presence of juveniles in May and Sept ember. The NES colony at the archipelago wa s catalogued as “in decline”, ba sed on previous countings. This high-resolution survey compleme nts past and future studies in the region, and adds a nother dimension to our understanding of th ese species, which is largely based on infor mation from their main rookeries in California. 2015 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48043157002 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.41 |
| title | Current status of the California sea lion ( Zalophus californianus) and the northern elephant seal (Mirounga angustirostris) at the San Benito Archipelago, Mexico |
| title_alt | Estado actual del lobo marino de California (Zalophus californianus) y el elefante marino del norte (Mirounga angustirostris) en el archipiélago San Benito, México Current status of the California sea lion (Zalophus californianus) and the northern elephant seal (Mirounga angustirostris) at the San Benito Archipelago, Mexico |
| topic | Ciencias de la Tierra abundance Baja Cali fornia California sea lions San Benito Archipel ago northern ele phant seals |
| topic_facet | California sea lions northern elephant seals San Benito Archipelago Baja California abundance lobos marinos de California elefantes marinos del norte archipiélago San Benito abundancia |
| url | https://www.redalyc.org/articulo.oa?id=48043157002 https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/2545 |