Journal of Comparative Physiology B

, Volume 163, Issue 8, pp 642–648 | Cite as

Embryonic heart rate and oxygen pulse in two procellariiform seabirds, Diomedea immutabilis and Puffinus pacificus

  • H. Tazawa
  • G. Causey Whittow
Article
Accepted:

Abstract

Developmental patterns of embryonic heart rate were measured non-invasively in two procellariiform seabirds, the Laysan albatross (Diomedea immutabilis) and wedge-tailed shearwater (Puffinus pacificus), during prepipping and after pipping. The O2 pulse, defined as the O2 consumption per single heart beat, was calculated using the previously reported O2 consumption for these species. The embryonic heart rate of the albatross was not changed by internal pipping (initial pipping event in this species), remained unchanged during the prolonged internal pipping period and tended to increase, although insignificantly, with the initiation of external pipping (second pipping event). Heart rate in the shearwater remained unchanged during the late prepipping stages, did not change with external pipping (initial pipping event), but increased during the prolonged internal pipping period (second pipping event) and reached a maximum on the last day of incubation. The developmental pattern of heart rate in the shearwater was very similar to that reported previously for the brown noddy, a member of the order Charadriiformes but with the same pipping sequence. Developmental patterns of embryonic O2 pulse were also different between the two procellariiform seabirds. However, those of the shearwater and the noddy were similar. The sequence of access to atmospheric O2 during development and hatching may be an important factor determining the developmental patterns of embryonic heart rate and O2 pulse.

Key words

Developmental pattern Egg and embryo-Heart rate Oxygen consumption Diomedea immutabilis and Puffinus pacificus 

Abbreviations

A-VO2

difference, arteriovenous oxygen difference

BCG

ballistocardiogram of egg

CV

coefficient of variation

EP

external pipping

HR

heart rate

IP

internal pipping

mass

mass of freshly laid egg

SD

standard deviation

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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • H. Tazawa
    • 1
  • G. Causey Whittow
    • 2
  1. 1.Department of Electrical and Electronic EngineeringInstitute of TechnologyMuroranJapan
  2. 2.Department of Physiology, John A. Burns School of MedicineUniversity of HawaiiHonoluluUSA

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