Sex differences in body size and body condition of California sea lion (Zalophus californianus) pups from the Gulf of California

Sebastián P. Luque, David Aurioles-Gamboa

Research output: Contribution to journalArticle

19 Citations (Scopus)

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 languageAmerican English
Pages (from-to)147-160
Number of pages130
JournalMarine Mammal Science
DOIs
StatePublished - 1 Jan 2001
Externally publishedYes

Fingerprint

Sea Lions
pinniped
Gulf of California
Body Size
body condition
gender differences
Sex Characteristics
pups
body size
milk
Milk
harbor
Zalophus californianus
gulf
Growth
breeding season
neonates
Population
energy

Cite this

@article{91b1163f22344882b0e095e6e650b145,
title = "Sex differences in body size and body condition of California sea lion (Zalophus californianus) pups from the Gulf of California",
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.",
author = "Luque, {Sebasti{\'a}n P.} and David Aurioles-Gamboa",
year = "2001",
month = "1",
day = "1",
doi = "10.1111/j.1748-7692.2001.tb00985.x",
language = "American English",
pages = "147--160",
journal = "Marine Mammal Science",
issn = "0824-0469",
publisher = "Wiley-Blackwell",

}

TY - JOUR

T1 - Sex differences in body size and body condition of California sea lion (Zalophus californianus) pups from the Gulf of California

AU - Luque, Sebastián P.

AU - Aurioles-Gamboa, David

PY - 2001/1/1

Y1 - 2001/1/1

N2 - 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.

AB - 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.

UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0035159773&origin=inward

UR - https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=0035159773&origin=inward

U2 - 10.1111/j.1748-7692.2001.tb00985.x

DO - 10.1111/j.1748-7692.2001.tb00985.x

M3 - Article

SP - 147

EP - 160

JO - Marine Mammal Science

JF - Marine Mammal Science

SN - 0824-0469

ER -