Abstract
The Gulf of California harbors about 15% of the total California sea lion (Zalophus californianus californianus) population. We studied pup morphometrics from eight Gulf of California rookeries during the 1996 and 1997 reproductive seasons to describe sex differences in body size and body condition indices. Newborn pup body size was not different from previous reports. Male pups were heavier and larger than female pups in terms of all linear dimensions. Morphometric relationships, however, showed that males were 3%-4% denser, and that after removing the effects of length, they were about 2% heavier than females. Sculp depth adjusted for length was 12% larger in female than in male pups. Our data provide further evidence that male otariid pups may allocate a larger fraction of milk energy to muscular and skeletal growth compared to female pups.
Original language | English |
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Pages (from-to) | 147-160 |
Number of pages | 14 |
Journal | Marine Mammal Science |
Volume | 17 |
Issue number | 1 |
DOIs | |
State | Published - 1 Jan 2001 |
Externally published | Yes |
Keywords
- Body condition
- Body size
- California sea lion
- Growth
- Gulf of California
- Morphometry
- Sexual dimorphism
- Zalophus californianus