Chemical composition and tissue energy density of the cuttlefish (Sepia apama) and its assimilation efficiency by Diomedea albatrosses.

Battam, H., Richardson, M., Watson, A. W. T. and Buttemer, W. A. 2010, Chemical composition and tissue energy density of the cuttlefish (Sepia apama) and its assimilation efficiency by Diomedea albatrosses., Journal of comparative physiology B : biochemical, systemic, and environmental physiology, vol. 180, no. 8, pp. 1247-1255.

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Title Chemical composition and tissue energy density of the cuttlefish (Sepia apama) and its assimilation efficiency by Diomedea albatrosses.
Formatted title Chemical composition and tissue energy density of the cuttlefish (Sepia apama) and its assimilation efficiency by Diomedea albatrosses.
Author(s) Battam, H.
Richardson, M.
Watson, A. W. T.
Buttemer, W. A.
Journal name Journal of comparative physiology B : biochemical, systemic, and environmental physiology
Volume number 180
Issue number 8
Start page 1247
End page 1255
Total pages 9
Publisher Springer
Place of publication Berlin, Germany
Publication date 2010-11
ISSN 0174-1578
1432-136X
Keyword(s) Cephalopods
Proximate analysis
Albatrosses
Assimilation efficiency
Summary The cuttlefish Sepia apama Gray (Mollusca: Cephalopoda) is a seasonally abundant food resource exploited annually by moulting albatrosses throughout winter and early spring in the coastal waters of New South Wales, Australia. To assess its nutritional value as albatross forage, we analysed S. apama for water, lipid protein, ash contents, energy density and amino acid composition. Because albatrosses consistently consume S. apama parts preferentially in the order of head, viscera and mantle, we analysed these sections separately, but did not identify any nutritional basis for this selective feeding behaviour. The gross energy value of S. apama bodies was 20.9 kJ/g dry mass, but their high water content (>83%; cf <70% for fish) results in a relatively low energy density of 3.53 kJ/g. This may contribute to a need to take large meals, which subsequently degrade flight performance. Protein content was typically >75% dry mass, whereas fat content was only about 1%. Albatrosses feed on many species of cephalopods and teleost fish, and we found the amino acid composition of S. apama to be comparable to a range of species within these taxa. We used S. apama exclusively in feeding trials to estimate the energy assimilation efficiency for Diomedea albatrosses. We estimated their nitrogen-corrected apparent energy assimilation efficiency for consuming this prey to be 81.82 ± 0.72% and nitrogen retention as 2.90 ± 0.11 g N kg-1 d-1. Although S. apama has a high water content and relatively low energy density, its protein composition is otherwise comparable to other albatross prey species. Consequently, the large size and seasonal abundance of this prey should ensure that albatrosses remain replete and adequately nourished on this forage while undergoing moult.

Language eng
Field of Research 060807 Animal Structure and Function
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2010
Copyright notice ©2010, Springer - Verlag
Persistent URL http://hdl.handle.net/10536/DRO/DU:30034426

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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