Maternal care in the California sea lion at Los Islotes, Gulf of California, Mexico

 Behavioural components of maternal assistance in the California sea lion at a small colony in the southern part of the Gulf of California were analyzed and compared between one year with normal environmental conditions (1996) and one influenced by El Niño 1998). The components considered w...

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Autores principales:	García-Aguilar, MC, Aurioles-Gamboa, D
Formato:	info:eu-repo/semantics/article
Lenguaje:	eng
Publicado:	Iniversidad Autónoma de Baja California 2003
Materias:	maternal care California sea lion Gulf of California cuidado materno lobo marino de California Golfo de California
Acceso en línea:	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/199
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id	repositorioinstitucional-20.500.12930-7370
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spelling	repositorioinstitucional-20.500.12930-73702023-05-09T14:30:34Z Maternal care in the California sea lion at Los Islotes, Gulf of California, Mexico Cuidado materno en el lobo marino de California de Los Islotes, Golfo de California, México García-Aguilar, MC Aurioles-Gamboa, D maternal care California sea lion Gulf of California cuidado materno lobo marino de California Golfo de California  Behavioural components of maternal assistance in the California sea lion at a small colony in the southern part of the Gulf of California were analyzed and compared between one year with normal environmental conditions (1996) and one influenced by El Niño 1998). The components considered were the frequency, duration, intensity and rate of lactation, and the frequency and duration of the feeding trips. The parameters employed to measure the intensity of the maternal investment were the weight, density and growth rate of the pups. No significant differences were found in both years between the weight of female and male pups, growth rate and body density; when comparing these parameters between the years, no significant differences were found either. In 1996, the daily lactation rate and the intensity decreased while the pups grew, but in 1998 the lactation rate remained constant and the intensity increased. The results indicate that the difference found in 1998 is probably due to the use of an alternative breeding strategy when the environmental conditions are poor. The duration of the feeding trips was significantly greater in 1998 than in 1996 (2.05 ± 0.87 d and 1.3 ± 0.60 d, respectively). For 1996, the estimation of the cycle duration (time of feeding trip + time of assistance in rookery) was 2.07 ± 1.5 d. Two variables were associated with the growth rate of the pups: intensity of lactation and frequency of the feeding trips. Se analizaron algunos componentes conductuales del cuidado materno en el lobo marino de California en una colonia pequeña del sur del Golfo de California, comparándolos entre un año de condiciones ambientales normales (1996) y uno con condiciones afectadas por El Niño (1998). Los componentes que se consideraron fueron frecuencia, duración, intensidad y tasa del amamantamiento, y frecuencia y duración de los viajes de alimentación. Los parámetros de la intensidad de la inversion materna que se emplearon fueron peso, densidad y tasa de crecimiento de las crías. En ningún año se encontraron diferencias significativas entre el peso de las crías machos y hembras, en la tasa de crecimiento ni en la densidad corporal; al comparar estos parámetros entre años tampoco hubo diferencias. La tasa diaria de amamantamiento y la intensidad disminuyeron en 1996 conforme las crías crecían, pero en 1998 la tasa de amamantamiento se mantuvo constante y la intensidad se incrementó. Los resultados indican que la diferencia en 1998 posiblemente sea una estrategia alternativa de crianza cuando las condiciones ambientales se encuentran empobrecidas. La duración de los viajes de alimentación fue significativamente mayor en 1998 que en 1996 (2.05 ± 0.87 d y 1.3 ± 0.60 d, respectivamente); para 1996 se estimó la duración del ciclo (tiempo en viaje de alimentación + periodo de atención en tierra) en 2.07 ± 1.5 d. Dos variables se relacionaron con la tasa de crecimiento de las crías: la intensidad del amamantamiento y la frecuencia de los viajes de alimentación. 2003-03-06 2021-06-03T03:55:05Z 2021-06-03T03:55:05Z 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/199 10.7773/cm.v29i42.199 https://hdl.handle.net/20.500.12930/7370 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/199/168 application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 29 No. 4B (2003); 573-583 Ciencias Marinas; Vol. 29 Núm. 4B (2003); 573-583 2395-9053 0185-3880
institution	Repositorio Institucional
collection	DSpace
language	eng
topic	maternal care California sea lion Gulf of California cuidado materno lobo marino de California Golfo de California
spellingShingle	maternal care California sea lion Gulf of California cuidado materno lobo marino de California Golfo de California García-Aguilar, MC Aurioles-Gamboa, D Maternal care in the California sea lion at Los Islotes, Gulf of California, Mexico
description	Behavioural components of maternal assistance in the California sea lion at a small colony in the southern part of the Gulf of California were analyzed and compared between one year with normal environmental conditions (1996) and one influenced by El Niño 1998). The components considered were the frequency, duration, intensity and rate of lactation, and the frequency and duration of the feeding trips. The parameters employed to measure the intensity of the maternal investment were the weight, density and growth rate of the pups. No significant differences were found in both years between the weight of female and male pups, growth rate and body density; when comparing these parameters between the years, no significant differences were found either. In 1996, the daily lactation rate and the intensity decreased while the pups grew, but in 1998 the lactation rate remained constant and the intensity increased. The results indicate that the difference found in 1998 is probably due to the use of an alternative breeding strategy when the environmental conditions are poor. The duration of the feeding trips was significantly greater in 1998 than in 1996 (2.05 ± 0.87 d and 1.3 ± 0.60 d, respectively). For 1996, the estimation of the cycle duration (time of feeding trip + time of assistance in rookery) was 2.07 ± 1.5 d. Two variables were associated with the growth rate of the pups: intensity of lactation and frequency of the feeding trips.
format	info:eu-repo/semantics/article
author	García-Aguilar, MC Aurioles-Gamboa, D
author_facet	García-Aguilar, MC Aurioles-Gamboa, D
author_sort	García-Aguilar, MC
title	Maternal care in the California sea lion at Los Islotes, Gulf of California, Mexico
title_short	Maternal care in the California sea lion at Los Islotes, Gulf of California, Mexico
title_full	Maternal care in the California sea lion at Los Islotes, Gulf of California, Mexico
title_fullStr	Maternal care in the California sea lion at Los Islotes, Gulf of California, Mexico
title_full_unstemmed	Maternal care in the California sea lion at Los Islotes, Gulf of California, Mexico
title_sort	maternal care in the california sea lion at los islotes, gulf of california, mexico
publisher	Iniversidad Autónoma de Baja California
publishDate	2003
url	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/199
_version_	1792609343225462784

Maternal care in the California sea lion at Los Islotes, Gulf of California, Mexico

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