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Journal of Comparative Physiology B

, Volume 166, Issue 7, pp 405–411 | Cite as

Energy intake and utilisation by nursing bearded seal (Erignathus barbatus) pups from Svalbard, Norway

  • C. Lydersen
  • K. M. Kovacs
  • M. O. Hammill
  • I. Gjertz
Original Paper

Abstract

In this study we measure energy intake via milk in nursing bearded seal (Erignathus barbatus) pups and determine how this energy is allocated into metabolism and storage of new tissues. This was accomplished using longitudinal mass gain records and the doubly labelled water technique on nursing pups in combination with cross-sectional data on changes in milk composition from bearded seal mothers. The pups (n=3) were all less than a week old at the start of the experiments. Pups gained 3.3±0.4 kg·day-1 of which 50% was fat, 14% protein and 36% water. Average daily water influx for the pups was 69.5±9.0 ml · kg-1· day-1. Average CO2 production during the study period was 0.99±0.10 ml·g-1·h-1, which corresponds to a field metabolic rate of 642±67 kJ·kg-1· day-1, or 6.0±0.5 times the predicted basal metabolic rate according to Kleiber (1975). The pups drank an average of 7.6±0.5 kg of milk daily. This corresponds to a daily energy intake of 154±8 MJ, 47±14% of which was stored as new body tissue. Despite this high energy intake bearded seal pups do not get as fat as do other nursing phocids. This is in part due to their larger body size but also due to their very active aquatic lifestyle and the lower and more consistent fat content of the milk compared to other phocid species. Bearded seal mothers forage during lactation and may also be involved in teaching their pups to feed independently. All these data suggest that the lactation strategy of bearded seals differs from the phocid norm.

Key words

Milk intake Growth Energy consumption Bearded seals,Erignathus barbatus Behaviour 

Abbreviations

BM

body mass

BMR

basal metabolic rate

FMR

field metabolic rate

HT18

O doubly labelled water

HTO

tritiated water

IU

international unit

RQ

respiration quotient

TBW

total body water

TDR

time-depth recorder

VHF

very high frequency

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • C. Lydersen
    • 1
  • K. M. Kovacs
    • 2
  • M. O. Hammill
    • 3
  • I. Gjertz
    • 4
  1. 1.Norwegian Polar InstituteTromsøNorway
  2. 2.Department of BiologyUniversity of WaterlooWaterlooCanada
  3. 3.Institut Maurice LamontagneMont-JoliCanada
  4. 4.Norwegian Polar instituteOsloNorway

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