Cost-benefit analysis of mollusc-eating in a shorebird II:Optimizing gizzard size in the face of seasonal demands
Aiming to interpret functionally the large variation in gizzard masses of red knots Calidris canutus, we experimentally studied how the digestive processing rate is influenced by the size of the gizzard. During their non-breeding season, red knots feed on hard-shelled molluscs, which they ingest who...
Published in: | Journal of Experimental Biology |
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Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2003
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Online Access: | https://hdl.handle.net/11370/2d679d3a-7078-4015-89ac-950438389121 https://research.rug.nl/en/publications/2d679d3a-7078-4015-89ac-950438389121 https://doi.org/10.1242/jeb.00546 https://pure.rug.nl/ws/files/6675927/2003JExpBiolvGils.pdf |
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ftunigroningenpu:oai:pure.rug.nl:publications/2d679d3a-7078-4015-89ac-950438389121 2024-06-23T07:51:55+00:00 Cost-benefit analysis of mollusc-eating in a shorebird II:Optimizing gizzard size in the face of seasonal demands van Gils, J A Piersma, T Dekinga, A Dietz, M W 2003-10 application/pdf https://hdl.handle.net/11370/2d679d3a-7078-4015-89ac-950438389121 https://research.rug.nl/en/publications/2d679d3a-7078-4015-89ac-950438389121 https://doi.org/10.1242/jeb.00546 https://pure.rug.nl/ws/files/6675927/2003JExpBiolvGils.pdf eng eng https://research.rug.nl/en/publications/2d679d3a-7078-4015-89ac-950438389121 info:eu-repo/semantics/openAccess van Gils , J A , Piersma , T , Dekinga , A & Dietz , M W 2003 , ' Cost-benefit analysis of mollusc-eating in a shorebird II : Optimizing gizzard size in the face of seasonal demands ' , Journal of Experimental Biology , vol. 206 , no. 19 , pp. 3369-3380 . https://doi.org/10.1242/jeb.00546 gizzard digestive constraint intake rate red knot Calidris canutus ultrasonography optimization phenotypic flexibility BASAL METABOLIC-RATE KNOTS CALIDRIS-CANUTUS WADDEN SEA ORGAN SIZE RED KNOTS TERRESTRIAL LOCOMOTION HAEMATOPUS-OSTRALEGUS FUNCTIONAL-RESPONSE CERASTODERMA-EDULE article 2003 ftunigroningenpu https://doi.org/10.1242/jeb.00546 2024-06-10T16:03:33Z Aiming to interpret functionally the large variation in gizzard masses of red knots Calidris canutus, we experimentally studied how the digestive processing rate is influenced by the size of the gizzard. During their non-breeding season, red knots feed on hard-shelled molluscs, which they ingest whole and crush in their gizzard. In three experiments with captive birds we tested predictions of the hypothesis that gizzard size, via the rate of shell crushing and processing, constrains intake rate in red knots (against the alternative idea that external handling times constrain intake rate). Gizzard size within individual birds was manipulated by varying the hardness of the diet on offer, and was confirmed by ultrasonography. The results upheld the 'shell-crushing hypothesis' and rejected the 'handling time hypothesis'. Intake rates on with-shell prey increased with gizzard size, and decreased with shell mass per prey. Intake rates on soft (without shell) prey were higher than on with-shell prey and were unaffected by gizzard size. Offering prey that were heavily shelled relative to their flesh mass led to energy intake rates that were marginally sufficient to balance the daily energy budget within the time that is naturally available in a tidal system. We predicted the optimal gizzard sizes that are required to either (1) balance energy income with energy expenditure, or (2) to maximise net daily energy intake. The gizzard mass of free-living red knots in the Wadden Sea is such that it maximises daily net energy intake in spring when fuelling for migration, while it balances energy budget throughout the remainder of the year. Article in Journal/Newspaper Calidris canutus Red Knot University of Groningen research database Journal of Experimental Biology 206 19 3369 3380 |
institution |
Open Polar |
collection |
University of Groningen research database |
op_collection_id |
ftunigroningenpu |
language |
English |
topic |
gizzard digestive constraint intake rate red knot Calidris canutus ultrasonography optimization phenotypic flexibility BASAL METABOLIC-RATE KNOTS CALIDRIS-CANUTUS WADDEN SEA ORGAN SIZE RED KNOTS TERRESTRIAL LOCOMOTION HAEMATOPUS-OSTRALEGUS FUNCTIONAL-RESPONSE CERASTODERMA-EDULE |
spellingShingle |
gizzard digestive constraint intake rate red knot Calidris canutus ultrasonography optimization phenotypic flexibility BASAL METABOLIC-RATE KNOTS CALIDRIS-CANUTUS WADDEN SEA ORGAN SIZE RED KNOTS TERRESTRIAL LOCOMOTION HAEMATOPUS-OSTRALEGUS FUNCTIONAL-RESPONSE CERASTODERMA-EDULE van Gils, J A Piersma, T Dekinga, A Dietz, M W Cost-benefit analysis of mollusc-eating in a shorebird II:Optimizing gizzard size in the face of seasonal demands |
topic_facet |
gizzard digestive constraint intake rate red knot Calidris canutus ultrasonography optimization phenotypic flexibility BASAL METABOLIC-RATE KNOTS CALIDRIS-CANUTUS WADDEN SEA ORGAN SIZE RED KNOTS TERRESTRIAL LOCOMOTION HAEMATOPUS-OSTRALEGUS FUNCTIONAL-RESPONSE CERASTODERMA-EDULE |
description |
Aiming to interpret functionally the large variation in gizzard masses of red knots Calidris canutus, we experimentally studied how the digestive processing rate is influenced by the size of the gizzard. During their non-breeding season, red knots feed on hard-shelled molluscs, which they ingest whole and crush in their gizzard. In three experiments with captive birds we tested predictions of the hypothesis that gizzard size, via the rate of shell crushing and processing, constrains intake rate in red knots (against the alternative idea that external handling times constrain intake rate). Gizzard size within individual birds was manipulated by varying the hardness of the diet on offer, and was confirmed by ultrasonography. The results upheld the 'shell-crushing hypothesis' and rejected the 'handling time hypothesis'. Intake rates on with-shell prey increased with gizzard size, and decreased with shell mass per prey. Intake rates on soft (without shell) prey were higher than on with-shell prey and were unaffected by gizzard size. Offering prey that were heavily shelled relative to their flesh mass led to energy intake rates that were marginally sufficient to balance the daily energy budget within the time that is naturally available in a tidal system. We predicted the optimal gizzard sizes that are required to either (1) balance energy income with energy expenditure, or (2) to maximise net daily energy intake. The gizzard mass of free-living red knots in the Wadden Sea is such that it maximises daily net energy intake in spring when fuelling for migration, while it balances energy budget throughout the remainder of the year. |
format |
Article in Journal/Newspaper |
author |
van Gils, J A Piersma, T Dekinga, A Dietz, M W |
author_facet |
van Gils, J A Piersma, T Dekinga, A Dietz, M W |
author_sort |
van Gils, J A |
title |
Cost-benefit analysis of mollusc-eating in a shorebird II:Optimizing gizzard size in the face of seasonal demands |
title_short |
Cost-benefit analysis of mollusc-eating in a shorebird II:Optimizing gizzard size in the face of seasonal demands |
title_full |
Cost-benefit analysis of mollusc-eating in a shorebird II:Optimizing gizzard size in the face of seasonal demands |
title_fullStr |
Cost-benefit analysis of mollusc-eating in a shorebird II:Optimizing gizzard size in the face of seasonal demands |
title_full_unstemmed |
Cost-benefit analysis of mollusc-eating in a shorebird II:Optimizing gizzard size in the face of seasonal demands |
title_sort |
cost-benefit analysis of mollusc-eating in a shorebird ii:optimizing gizzard size in the face of seasonal demands |
publishDate |
2003 |
url |
https://hdl.handle.net/11370/2d679d3a-7078-4015-89ac-950438389121 https://research.rug.nl/en/publications/2d679d3a-7078-4015-89ac-950438389121 https://doi.org/10.1242/jeb.00546 https://pure.rug.nl/ws/files/6675927/2003JExpBiolvGils.pdf |
genre |
Calidris canutus Red Knot |
genre_facet |
Calidris canutus Red Knot |
op_source |
van Gils , J A , Piersma , T , Dekinga , A & Dietz , M W 2003 , ' Cost-benefit analysis of mollusc-eating in a shorebird II : Optimizing gizzard size in the face of seasonal demands ' , Journal of Experimental Biology , vol. 206 , no. 19 , pp. 3369-3380 . https://doi.org/10.1242/jeb.00546 |
op_relation |
https://research.rug.nl/en/publications/2d679d3a-7078-4015-89ac-950438389121 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1242/jeb.00546 |
container_title |
Journal of Experimental Biology |
container_volume |
206 |
container_issue |
19 |
container_start_page |
3369 |
op_container_end_page |
3380 |
_version_ |
1802643068770320384 |