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Temperature-dependent digestion handling time in juvenile cod and possible consequences for prey choice

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dc.contributor.author Knutsen, Ian
dc.contributor.author Salvanes, Anne Gro Vea
dc.date.accessioned 2009-10-01T07:49:08Z
dc.date.available 2009-10-01T07:49:08Z
dc.date.issued 1999-05-18
dc.identifier.citation Marine Ecology Progress Series 181: 61-79 en
dc.identifier.issn 0171-8630
dc.identifier.uri http://dx.doi.org/10.3354/meps181061
dc.identifier.uri http://hdl.handle.net/1956/3506
dc.description.abstract The paper combines experimental work with modelling. The aim was to estimate the temperature-dependent digestion handling time, which is defined as the time taken to digest the whole prey or the whole stomach contents, and to examine potential consequences of prey digestibility on prey choice. A surface-dependent digestion model that reflects the geometric shape of a piscivore prey was applied to experimental data representing the weight of prey remaining undigested at various points in time from the time at which the prey was first ingested. The fish used were juvenile cod fed different meal sizes of two-spotted goby Gobjusculus flavescens Fabricius at 4 temperatures. It is assumed that prey digestion is a surface process in which digestive enzymes attack progressively deeper into a prey of known size and shape so that the average digestion rate would be proportional to prey radus. This process is characterized by the digestion velocity d, (cm h-') and the digestion handling time. d, was estimated for various meal sizes and temperatures. Next, these estlrnates were used to obtain a standardized temperature-dependent function: d, = dso[e~h34'"0)oTf ],which the standardized digestion velocity estimate at O°C, d, = 0.0026 cm h-' The d, relation expresses the digestion velocity over a 10-fold meal size increase for a temperature range within natural seasonal variation for the cod. The digestion velocity d, was constant for a 10-fold difference in meal size within the temperature range. However, the digestion handling time increased with increasing meal size, but decreased with increasing temperature. It was demonstrated that predictions from a modified prey choice model which incorporates the effect of digestion differ from predictions from classical models which do not account for prey digestion. en
dc.language.iso eng en
dc.publisher Inter-Research en
dc.subject Juvenile cod en
dc.subject Prey en
dc.subject Digestion en
dc.subject Temperature en
dc.subject Feeding behaviour en
dc.title Temperature-dependent digestion handling time in juvenile cod and possible consequences for prey choice en
dc.type Journal article en
dc.type Peer reviewed en
dc.subject.nsi VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 en


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