Seasonal variation in the abundance of South American sea lions Otaria flavescens (Shaw, 1800) in Chañaral Island, Reserva Nacional Pingüino de Humboldt, Chile
From January 2007 to March 2008, we examined variation in the abundance of the South American sea lion Otaria flavescens in Chañaral Island breeding colony by sex, age-class, and reproductive seasonality. The number of sea lions on land was highest during the breeding season. This variation was main...
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| Lenguaje: | English |
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Universidad de Valparaíso. Facultad de Ciencias del Mar
2009
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oai:scielo:S0718-195720090003000142010-03-31Seasonal variation in the abundance of South American sea lions Otaria flavescens (Shaw, 1800) in Chañaral Island, Reserva Nacional Pingüino de Humboldt, ChileSepúlveda,MaritzaInostroza,PatriciaPérez-Alvarez,M. JoséOliva,DorisMoraga,Rodrigo Census Chilean coast sea lions circannual rhythms Otaria byronia From January 2007 to March 2008, we examined variation in the abundance of the South American sea lion Otaria flavescens in Chañaral Island breeding colony by sex, age-class, and reproductive seasonality. The number of sea lions on land was highest during the breeding season. This variation was mainly influenced by the number of adult females, because this age class was the most important in the colony and showed an increase in abundance during this period. No seasonal variation in the number of adult males, subadult males, and juveniles was detected. The sex ratio during the breeding season was highly biased towards females, while it was close to 1:1 during the rest of the year. This study demonstrates that variation in the abundance and sex/age class composition of sea lions at Chañaral Island colony is largely influenced by reproductive activity.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.44 n.3 20092009-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572009000300014en10.4067/S0718-19572009000300014 |
| institution |
Scielo Chile |
| collection |
Scielo Chile |
| language |
English |
| topic |
Census Chilean coast sea lions circannual rhythms Otaria byronia |
| spellingShingle |
Census Chilean coast sea lions circannual rhythms Otaria byronia Sepúlveda,Maritza Inostroza,Patricia Pérez-Alvarez,M. José Oliva,Doris Moraga,Rodrigo Seasonal variation in the abundance of South American sea lions Otaria flavescens (Shaw, 1800) in Chañaral Island, Reserva Nacional Pingüino de Humboldt, Chile |
| description |
From January 2007 to March 2008, we examined variation in the abundance of the South American sea lion Otaria flavescens in Chañaral Island breeding colony by sex, age-class, and reproductive seasonality. The number of sea lions on land was highest during the breeding season. This variation was mainly influenced by the number of adult females, because this age class was the most important in the colony and showed an increase in abundance during this period. No seasonal variation in the number of adult males, subadult males, and juveniles was detected. The sex ratio during the breeding season was highly biased towards females, while it was close to 1:1 during the rest of the year. This study demonstrates that variation in the abundance and sex/age class composition of sea lions at Chañaral Island colony is largely influenced by reproductive activity. |
| author |
Sepúlveda,Maritza Inostroza,Patricia Pérez-Alvarez,M. José Oliva,Doris Moraga,Rodrigo |
| author_facet |
Sepúlveda,Maritza Inostroza,Patricia Pérez-Alvarez,M. José Oliva,Doris Moraga,Rodrigo |
| author_sort |
Sepúlveda,Maritza |
| title |
Seasonal variation in the abundance of South American sea lions Otaria flavescens (Shaw, 1800) in Chañaral Island, Reserva Nacional Pingüino de Humboldt, Chile |
| title_short |
Seasonal variation in the abundance of South American sea lions Otaria flavescens (Shaw, 1800) in Chañaral Island, Reserva Nacional Pingüino de Humboldt, Chile |
| title_full |
Seasonal variation in the abundance of South American sea lions Otaria flavescens (Shaw, 1800) in Chañaral Island, Reserva Nacional Pingüino de Humboldt, Chile |
| title_fullStr |
Seasonal variation in the abundance of South American sea lions Otaria flavescens (Shaw, 1800) in Chañaral Island, Reserva Nacional Pingüino de Humboldt, Chile |
| title_full_unstemmed |
Seasonal variation in the abundance of South American sea lions Otaria flavescens (Shaw, 1800) in Chañaral Island, Reserva Nacional Pingüino de Humboldt, Chile |
| title_sort |
seasonal variation in the abundance of south american sea lions otaria flavescens (shaw, 1800) in chañaral island, reserva nacional pingüino de humboldt, chile |
| publisher |
Universidad de Valparaíso. Facultad de Ciencias del Mar |
| publishDate |
2009 |
| url |
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572009000300014 |
| work_keys_str_mv |
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