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Critical threshold size for overwintering sandeels (Ammodytes marinus)

van Deurs, Mikael; Hartvig, Martin LU and Steffensen, John Fleng (2011) In Marine Biology 158(12). p.2755-2764
Abstract
Several ecologically and commercially important fish species spend the winter in a state of minimum feeding activity and at lower risk of predation. To enable this overwintering behaviour, energetic reserves are generated prior to winter to support winter metabolism. Maintenance metabolism in fish scales with body size and increases with temperature, and the two factors together determine a critical threshold size for passive overwintering below which the organism is unlikely to survive without feeding. This is because the energetic cost of metabolism exceeds maximum energy reserves. In the present study, we estimated the energetic cost of overwintering from a bioenergetic model. The model was parameterised using respirometry-based... (More)
Several ecologically and commercially important fish species spend the winter in a state of minimum feeding activity and at lower risk of predation. To enable this overwintering behaviour, energetic reserves are generated prior to winter to support winter metabolism. Maintenance metabolism in fish scales with body size and increases with temperature, and the two factors together determine a critical threshold size for passive overwintering below which the organism is unlikely to survive without feeding. This is because the energetic cost of metabolism exceeds maximum energy reserves. In the present study, we estimated the energetic cost of overwintering from a bioenergetic model. The model was parameterised using respirometry-based measurements of standard metabolic rate in buried A. tobianus (a close relative to A. marinus) at temperatures from 5.3 to 18.3 degrees C and validated with two independent long-term overwintering experiments. Maximum attainable energy reserves were estimated from published data on A. marinus in the North Sea. The critical threshold size in terms of length (L(th)) for A. marinus in the North Sea was estimated to be 9.5 cm. We then investigated two general predictions: (1) Fish smaller than L(th) display winter feeding activity, and (2) size at maturation of iteroparous species is larger than L(th) to ensure sufficient energy reserves to accommodate both the metabolic cost of passive overwintering and reproductive investments. Both predictions were found to be consistent with data on size at maturation and total body energy in December and February. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Marine Biology
volume
158
issue
12
pages
2755 - 2764
publisher
Springer
external identifiers
  • wos:000299182500013
  • scopus:81555197133
ISSN
0025-3162
DOI
10.1007/s00227-011-1774-8
language
English
LU publication?
yes
id
112d7eac-a160-4e0d-8ee1-c847e1956b5d (old id 2345123)
date added to LUP
2012-02-24 13:08:34
date last changed
2017-04-09 03:47:26
@article{112d7eac-a160-4e0d-8ee1-c847e1956b5d,
  abstract     = {Several ecologically and commercially important fish species spend the winter in a state of minimum feeding activity and at lower risk of predation. To enable this overwintering behaviour, energetic reserves are generated prior to winter to support winter metabolism. Maintenance metabolism in fish scales with body size and increases with temperature, and the two factors together determine a critical threshold size for passive overwintering below which the organism is unlikely to survive without feeding. This is because the energetic cost of metabolism exceeds maximum energy reserves. In the present study, we estimated the energetic cost of overwintering from a bioenergetic model. The model was parameterised using respirometry-based measurements of standard metabolic rate in buried A. tobianus (a close relative to A. marinus) at temperatures from 5.3 to 18.3 degrees C and validated with two independent long-term overwintering experiments. Maximum attainable energy reserves were estimated from published data on A. marinus in the North Sea. The critical threshold size in terms of length (L(th)) for A. marinus in the North Sea was estimated to be 9.5 cm. We then investigated two general predictions: (1) Fish smaller than L(th) display winter feeding activity, and (2) size at maturation of iteroparous species is larger than L(th) to ensure sufficient energy reserves to accommodate both the metabolic cost of passive overwintering and reproductive investments. Both predictions were found to be consistent with data on size at maturation and total body energy in December and February.},
  author       = {van Deurs, Mikael and Hartvig, Martin and Steffensen, John Fleng},
  issn         = {0025-3162},
  language     = {eng},
  number       = {12},
  pages        = {2755--2764},
  publisher    = {Springer},
  series       = {Marine Biology},
  title        = {Critical threshold size for overwintering sandeels (Ammodytes marinus)},
  url          = {http://dx.doi.org/10.1007/s00227-011-1774-8},
  volume       = {158},
  year         = {2011},
}