Journal article
SEASONAL-VARIATION IN THE RELATIVE UTILIZATION OF DIETARY-PROTEIN FOR ENERGY AND BIOSYNTHESIS BY THE MUSSEL MYTILUS-EDULIS
Marine ecology. Progress series (Halstenbek), v 126(1-3)
01 Oct 1995
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Abstract
Mussels Mytilus edulis were collected from Whitsand Bay in southwest England during April, July and September 1993 and January 1994, and fed a defined diet of prekilled microalgae with one of 2 types of mixed protein/carbohydrate microcapsules. Both capsule types were comprised of the same w/w proportion of N-15-labeled protein and nonlabeled carbohydrate. However, Types 1 and 2 contained trace amounts of [C-14]carbohydrate and [C-14]protein, respectively. Defecation, excretion, respiration and incorporation of C-14 and N-15 isotopes were measured to describe the mussel's relative utilization of dietary carbohydrate (C-14 from Type 1), protein-e (C-14 from Type 2) and protein-N (N-15 from Types 1 and 2). In each experiment, mussels ingested similar quantities of capsule Types 1 and 2. However, the C-14-assimilation efficiency for carbohydrate (16 to 20%) was significantly greater than the C-14-assimilation efficiency for protein (7 to 15%). In contrast, protein-N was always assimilated with greater efficiency (25 to 82%) than either carbohydrate or protein-C. The difference in assimilation efficiency between protein-N and protein-C indicates that a large proportion of amino acids from dietary protein were hydrolyzed, with amino-N being preferentially assimilated. The relatively poor assimilation of amino-C indicates that mussels were not nutritionally Limited by energy since amino-C generated by the energy-intensive digestion process was not fully catabolized in the tricarboxylic acid cycle (i.e. not respired). The conservation of protein-N relative to protein-C was particularly noticeable in July when rates of ingestion and ammonia excretion were lowest, <1% of absorbed [N-15]protein was excreted, and [N-15]protein assimilation was 5 times more efficient than [C-14]protein assimilation. Further, rates of protein synthesis were greatest in July (71.2 mg d(-1)), compared vith April, September and January (39.2, 58.9 and 20.5 mg d(-1)). These findings suggest that seasonal variation in dietary protein utilization in M. edulis is governed chiefly by changing anabolic demands for amino-N, rather than by requirements for energy or essential amino acids.
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Details
- Title
- SEASONAL-VARIATION IN THE RELATIVE UTILIZATION OF DIETARY-PROTEIN FOR ENERGY AND BIOSYNTHESIS BY THE MUSSEL MYTILUS-EDULIS
- Creators
- D A KreegerAJS HawkinsB L BayneD M Lowe
- Publication Details
- Marine ecology. Progress series (Halstenbek), v 126(1-3)
- Publisher
- Inter-Research
- Number of pages
- 8
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES)
- Web of Science ID
- WOS:A1995TD59800015
- Scopus ID
- 2-s2.0-0029477521
- Other Identifier
- 991019184215104721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Ecology
- Marine & Freshwater Biology
- Oceanography