Ecological factors that determine distribution and abundance of the California sea lion Zalophus Californianus in the Gulf Of California
The population of the California sea lion Zulophus californianus (Lesson, 1828) in the Gulf of California during the breeding seasons of the 1980’s was estimated at 23,256 individuals, and 31,393 if census adjustments are applied. Of this total (23,256), 6.9% were adult males, 5.0% subadult males,...
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| Format: | Article |
| Language: | English |
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Universidad Autónoma de Baja California
1994-03-01
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| Series: | Ciencias Marinas |
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| Online Access: | http://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/976 |
| _version_ | 1827330524912287744 |
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| author | D Aurioles-Gamboa A Zavala-González |
| author_facet | D Aurioles-Gamboa A Zavala-González |
| author_sort | D Aurioles-Gamboa |
| collection | DOAJ |
| description |
The population of the California sea lion Zulophus californianus (Lesson, 1828) in the Gulf of California during the breeding seasons of the 1980’s was estimated at 23,256 individuals, and 31,393 if census adjustments are applied. Of this total (23,256), 6.9% were adult males, 5.0% subadult males, 40.7% adult females, 23.9% juveniles, 22.7% pups (less than one year of age) and 0.8% were termed miscellaneous. Eighty-six percent of the 29 sea-lion colonies studied were on islands, while the remaining colonies occupied capes of the mainland. However, around 98.8% of the sea-lion population was counted on islands. The number of islands (available habitat) did not determine the sea-lion distribution in the gulf, but the concentration of its usual preys (sardine, anchovy, mackerel and hake) did. Eighty-two percent of the sea-lion population and its pup production took place in the northern region of the Gulf of California (from Isla San Esteban northward), which seems to be associated with the major abundance of small pelagic fish in the gulf. California sea lions tend to inhabit small- and medium-sized islands (less than 3 km in length), which amount for 80% of the sea-lion population. The probable factors that determine the selection of islands this size are: 1) the absence of terrestrial predators, 2) easier communication of breeding animals and 3) sexual selection advantage for mating individuals. The operational sex ratio varied according to island size in a negative exponential trend. More adult females were available per adult males on smaller islands, since reduced space clumped the females. This clumping effect enhances a higher male-male competition (with an evident advantage for males), but also a higher quality of territorial males for the breeding females.
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| first_indexed | 2024-03-07T16:13:18Z |
| format | Article |
| id | doaj.art-c0b76c23c5e84fb9a037155fa7c8e31e |
| institution | Directory Open Access Journal |
| issn | 0185-3880 2395-9053 |
| language | English |
| last_indexed | 2024-03-07T16:13:18Z |
| publishDate | 1994-03-01 |
| publisher | Universidad Autónoma de Baja California |
| record_format | Article |
| series | Ciencias Marinas |
| spelling | doaj.art-c0b76c23c5e84fb9a037155fa7c8e31e2024-03-04T16:43:34ZengUniversidad Autónoma de Baja CaliforniaCiencias Marinas0185-38802395-90531994-03-0120410.7773/cm.v20i4.976Ecological factors that determine distribution and abundance of the California sea lion Zalophus Californianus in the Gulf Of CaliforniaD Aurioles-Gamboa0A Zavala-González1Universidad Nacional Autónoma de MéxicoCentro de Investigación Científica y de Educación Superior de Ensenada The population of the California sea lion Zulophus californianus (Lesson, 1828) in the Gulf of California during the breeding seasons of the 1980’s was estimated at 23,256 individuals, and 31,393 if census adjustments are applied. Of this total (23,256), 6.9% were adult males, 5.0% subadult males, 40.7% adult females, 23.9% juveniles, 22.7% pups (less than one year of age) and 0.8% were termed miscellaneous. Eighty-six percent of the 29 sea-lion colonies studied were on islands, while the remaining colonies occupied capes of the mainland. However, around 98.8% of the sea-lion population was counted on islands. The number of islands (available habitat) did not determine the sea-lion distribution in the gulf, but the concentration of its usual preys (sardine, anchovy, mackerel and hake) did. Eighty-two percent of the sea-lion population and its pup production took place in the northern region of the Gulf of California (from Isla San Esteban northward), which seems to be associated with the major abundance of small pelagic fish in the gulf. California sea lions tend to inhabit small- and medium-sized islands (less than 3 km in length), which amount for 80% of the sea-lion population. The probable factors that determine the selection of islands this size are: 1) the absence of terrestrial predators, 2) easier communication of breeding animals and 3) sexual selection advantage for mating individuals. The operational sex ratio varied according to island size in a negative exponential trend. More adult females were available per adult males on smaller islands, since reduced space clumped the females. This clumping effect enhances a higher male-male competition (with an evident advantage for males), but also a higher quality of territorial males for the breeding females. http://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/976California sea lionabundance and distributionpopulation structureoperational sex ratioGulf of California |
| spellingShingle | D Aurioles-Gamboa A Zavala-González Ecological factors that determine distribution and abundance of the California sea lion Zalophus Californianus in the Gulf Of California Ciencias Marinas California sea lion abundance and distribution population structure operational sex ratio Gulf of California |
| title | Ecological factors that determine distribution and abundance of the California sea lion Zalophus Californianus in the Gulf Of California |
| title_full | Ecological factors that determine distribution and abundance of the California sea lion Zalophus Californianus in the Gulf Of California |
| title_fullStr | Ecological factors that determine distribution and abundance of the California sea lion Zalophus Californianus in the Gulf Of California |
| title_full_unstemmed | Ecological factors that determine distribution and abundance of the California sea lion Zalophus Californianus in the Gulf Of California |
| title_short | Ecological factors that determine distribution and abundance of the California sea lion Zalophus Californianus in the Gulf Of California |
| title_sort | ecological factors that determine distribution and abundance of the california sea lion zalophus californianus in the gulf of california |
| topic | California sea lion abundance and distribution population structure operational sex ratio Gulf of California |
| url | http://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/976 |
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