Document Detail

Dynamic Influence of Maternal and Pup Traits on Maternal Care during Lactation in an Income Breeder, the Antarctic Fur Seal.
MedLine Citation:
PMID:  22494980     Owner:  NLM     Status:  In-Data-Review    
Abstract Life-history theory predicts that selection will favor optimal levels of parental effort that balance benefits of current reproduction with costs to survival and future reproduction. The optimal level of effort depends on parental traits, offspring traits, and provisioning strategy. Additionally, how these factors influence effort may differ depending on the stage of reproduction. The relative importance of maternal and offspring traits on energy allocation to offspring was investigated in known-age Antarctic fur seals Arctocephalus gazella across four stages of reproduction, using birth mass and milk-consumption measurements. Maternal traits were important during three of the four stages investigated, with larger females giving birth to larger pups and investing more in pups during perinatal and molt stages. Pup mass influenced maternal effort during the premolt stage, and provisioning strategy influenced postnatal maternal effort at all stages. Energy provided to the offspring during an attendance visit was positively related to the duration of the foraging-trip/visit cycle; however, when investment was controlled for trip/visit cycle duration, the overall rate of energy transfer was similar across trip durations. In addition to strong effects of maternal mass, pup traits affected energy allocation, suggesting that pup demand is important in determining maternal care. These findings emphasize the importance of considering state variables in life-history studies and suggest that timing of measurements of effort in species with long provisioning periods may influence conclusions and our ability to make comparisons of reproductive effort among species.
Birgitte I McDonald; Michael E Goebel; Daniel E Crocker; Daniel P Costa
Publication Detail:
Type:  Journal Article     Date:  2012-04-06
Journal Detail:
Title:  Physiological and biochemical zoology : PBZ     Volume:  85     ISSN:  1537-5293     ISO Abbreviation:  Physiol. Biochem. Zool.     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-04-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883369     Medline TA:  Physiol Biochem Zool     Country:  United States    
Other Details:
Languages:  eng     Pagination:  243-54     Citation Subset:  IM    
Department of Ecology and Evolutionary Biology, Long Marine Laboratory, 100 Shaffer Road, University of California, Santa Cruz, California 95060; 2Antarctic Ecosystem Research Division, National Oceanic and Atmospheric Administration/National Marine Fisheries Service/Southwest Fisheries Science Center, La Jolla, California 92038; 3Department of Biology, Sonoma State University, 1801 East Cotati Avenue, Rohnert Park, California 94928.
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