The timing of pupping and molting of the Pacific harbor seal, Phoca vitulina richardii, at Punta Banda Estuary, Baja California, Mexico

The timing of pupping and molting of the Pacific harbor seal, Phoca vitulina richardii, at Punta Banda Estuary, Baja California, Mexico

Pupping and molting of Phoca vitulina are processes that occur each year with high precision, although their timing varies according to location. Knowledge about the timing of these events allows us to determine when the highest numbers of individuals are hauled out, which is important to achieve a...

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Auteurs principaux: Fernández-Martín, Eva María, Heckel, Gisela, Schramm, Yolanda, García-Aguilar, María Concepción
Format: info:eu-repo/semantics/article
Langue:eng
Publié: Iniversidad Autónoma de Baja California 2016
Accès en ligne:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2615
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spelling repositorioinstitucional-20.500.12930-75032023-05-09T14:30:29Z The timing of pupping and molting of the Pacific harbor seal, Phoca vitulina richardii, at Punta Banda Estuary, Baja California, Mexico Temporalidad de los nacimientos y de la muda de la foca de puerto, Phoca vitulina richardii, en el estero de Punta Banda, Baja California, México Fernández-Martín, Eva María Heckel, Gisela Schramm, Yolanda García-Aguilar, María Concepción Pupping and molting of Phoca vitulina are processes that occur each year with high precision, although their timing varies according to location. Knowledge about the timing of these events allows us to determine when the highest numbers of individuals are hauled out, which is important to achieve a good abundance estimation. In this study we determined the timing of pupping and molting of P. v. richardii at Punta Banda Estuary, Baja California (Mexico), previously unknown at this site or along its entire distribution in Mexico. Observations were carried out during the 2011 and 2012 pupping seasons, as well as the 2012 molting season. We determined that the pupping season starts in mid- February and ends in mid-April, and that the maximum number of pups occurs in mid-March. The late premolt stage was observed from the end of March to the beginning of July, with the peak proportion of individuals in this stage at the beginning of May. The molting period extends from the end of April to mid-July, with the peak proportion of individuals molting at the beginning of June. The reverse molt pattern (starting on the torso and ending on the head and flippers) was the most common. The highest number of adult and subadult individuals on land was observed during the molting season; therefore, the best time to carry out counts to estimate seal abundance in this area is from the beginning of May to the beginning of June.  Los nacimientos y la muda de Phoca vitulina son procesos anuales que se repiten con alta precisión en el tiempo, aunque éste varía dependiendo del lugar. El conocimiento de la temporalidad de estos eventos permite determinar en qué momento se encuentra el mayor número de individuos en tierra, lo cual es importante para obtener una estimación más precisa de la abundancia de esta especie. En este trabajo se determinó la temporalidad de los nacimientos y la muda de P. v. richardii en el estero de Punta Banda, Baja California, que se desconocía hasta ahora, ahí y en toda su distribución en México. Se realizaron observaciones durante la temporada de cría de 2011 y 2012, y durante la temporada de muda de 2012. Se determinó que la temporada de cría comenzó a mediados de febrero y finalizó a mediados de abril, y que el máximo número de crías ocurrió a mediados de marzo. La etapa tardía de premuda se presentó desde finales de marzo hasta principios de julio, y la máxima proporción de individuos en esta etapa se observó a principios de mayo. El periodo de muda ocurrió desde finales de abril hasta mediados de julio, y la máxima proporción de individuos en muda se observó a principios de junio. El patrón de muda inverso (empieza por el tronco y termina en la cabeza y las aletas) fue el más común. El mayor número de individuos adultos e inmaduros en tierra se encontró durante la temporada de muda, de manera que el periodo más recomendable para realizar conteos, con el fin de estimar la abundancia de focas en la zona, es de principios de mayo a principios de junio. 2016-09-15 2021-06-03T03:55:31Z 2021-06-03T03:55:31Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2615 10.7773/cm.v42i3.2615 https://hdl.handle.net/20.500.12930/7503 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2615/1604 Copyright (c) 2016 Ciencias Marinas application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 42 No. 3 (2016); 195-208 Ciencias Marinas; Vol. 42 Núm. 3 (2016); 195-208 2395-9053 0185-3880
institution Repositorio Institucional
collection DSpace
language eng
description Pupping and molting of Phoca vitulina are processes that occur each year with high precision, although their timing varies according to location. Knowledge about the timing of these events allows us to determine when the highest numbers of individuals are hauled out, which is important to achieve a good abundance estimation. In this study we determined the timing of pupping and molting of P. v. richardii at Punta Banda Estuary, Baja California (Mexico), previously unknown at this site or along its entire distribution in Mexico. Observations were carried out during the 2011 and 2012 pupping seasons, as well as the 2012 molting season. We determined that the pupping season starts in mid- February and ends in mid-April, and that the maximum number of pups occurs in mid-March. The late premolt stage was observed from the end of March to the beginning of July, with the peak proportion of individuals in this stage at the beginning of May. The molting period extends from the end of April to mid-July, with the peak proportion of individuals molting at the beginning of June. The reverse molt pattern (starting on the torso and ending on the head and flippers) was the most common. The highest number of adult and subadult individuals on land was observed during the molting season; therefore, the best time to carry out counts to estimate seal abundance in this area is from the beginning of May to the beginning of June.
format info:eu-repo/semantics/article
author Fernández-Martín, Eva María
Heckel, Gisela
Schramm, Yolanda
García-Aguilar, María Concepción
spellingShingle Fernández-Martín, Eva María
Heckel, Gisela
Schramm, Yolanda
García-Aguilar, María Concepción
The timing of pupping and molting of the Pacific harbor seal, Phoca vitulina richardii, at Punta Banda Estuary, Baja California, Mexico
author_facet Fernández-Martín, Eva María
Heckel, Gisela
Schramm, Yolanda
García-Aguilar, María Concepción
author_sort Fernández-Martín, Eva María
title The timing of pupping and molting of the Pacific harbor seal, Phoca vitulina richardii, at Punta Banda Estuary, Baja California, Mexico
title_short The timing of pupping and molting of the Pacific harbor seal, Phoca vitulina richardii, at Punta Banda Estuary, Baja California, Mexico
title_full The timing of pupping and molting of the Pacific harbor seal, Phoca vitulina richardii, at Punta Banda Estuary, Baja California, Mexico
title_fullStr The timing of pupping and molting of the Pacific harbor seal, Phoca vitulina richardii, at Punta Banda Estuary, Baja California, Mexico
title_full_unstemmed The timing of pupping and molting of the Pacific harbor seal, Phoca vitulina richardii, at Punta Banda Estuary, Baja California, Mexico
title_sort timing of pupping and molting of the pacific harbor seal, phoca vitulina richardii, at punta banda estuary, baja california, mexico
publisher Iniversidad Autónoma de Baja California
publishDate 2016
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2615
_version_ 1792609018633519104

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