Further development of the Spalinger-Hobbs mechanistic foraging model for free ranging moose.
Spalinger and Hobbs proposed a mechanistic model of forage intake based on the mutually exclusive actions of biting and chewing. A necessary consequence of this model is that an animal postpones the intake of more food by biting when it is processing food by chewing. In previous work, the Spalinger–...
Published in: | Canadian Journal of Zoology |
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1999
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Online Access: | https://pure.qub.ac.uk/en/publications/2a254d6b-6aed-40c6-aa29-43adeb9a05aa http://www.nrcresearchpress.com/doi/pdf/10.1139/z99-119 |
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ftqueensubelpubl:oai:pure.qub.ac.uk/portal:publications/2a254d6b-6aed-40c6-aa29-43adeb9a05aa 2024-05-19T07:27:55+00:00 Further development of the Spalinger-Hobbs mechanistic foraging model for free ranging moose. Pastor, John Standke, Katie Farnsworth, Keith Moen, Ron Cohen, Yosef 1999-05 https://pure.qub.ac.uk/en/publications/2a254d6b-6aed-40c6-aa29-43adeb9a05aa http://www.nrcresearchpress.com/doi/pdf/10.1139/z99-119 eng eng https://pure.qub.ac.uk/en/publications/2a254d6b-6aed-40c6-aa29-43adeb9a05aa info:eu-repo/semantics/openAccess Pastor , J , Standke , K , Farnsworth , K , Moen , R & Cohen , Y 1999 , ' Further development of the Spalinger-Hobbs mechanistic foraging model for free ranging moose. ' , Canadian Journal of Zoology , pp. 1505–1512 . < http://www.nrcresearchpress.com/doi/pdf/10.1139/z99-119 > article 1999 ftqueensubelpubl https://doi.org/10.1139/z99-119 2024-05-02T00:26:25Z Spalinger and Hobbs proposed a mechanistic model of forage intake based on the mutually exclusive actions of biting and chewing. A necessary consequence of this model is that an animal postpones the intake of more food by biting when it is processing food by chewing. In previous work, the Spalinger–Hobbs model successfully predicted short-term intake in controlled experiments. Application of the model to an entire foraging bout requires the following assumptions: (i) biting and chewing are independent events; (ii) there are no periodicities in the length of consecutive bite or chew sequences; (iii) the average bite size is constant; and (iv) the bite rate does not change with the number of bites in the sequence. To test these assumptions, we videotaped entire foraging bouts of two free-ranging moose (Alces alces) feeding on dense swards of Epilobium angustifolium in midsummer. From these videotapes, we measured the time spent biting and chewing, the rates of biting and chewing, the frequency distributions of consecutive bite and chew sequences, and lengths of E. angustifolium shoots above the point of cropping. Plant samples were collected in order to determine bite mass. A total of 1050 bites and chews were analyzed for moose 1 and 1925 bites and chews for moose 2. For both moose, three chewing events occurred, on average, for each bite event. Given this 1:3 bite:chew ratio, the frequency distributions of consecutive bite and chew sequences were as expected from a geometric distribution of independent events. There were no time-series correlations or dominating frequencies in the lengths of bite and chew sequences. These findings fulfill the first three assumptions required to extend the Spalinger–Hobbs model to entire foraging bouts. However, the fourth assumption was not fulfilled, in that time spent per bite increased asymptotically with bite-sequence length. We therefore incorporated the effect of bite-sequence length on bite rate into the Spalinger–Hobbs model. The new model predicts that to simultaneously ... Article in Journal/Newspaper Alces alces Queen's University Belfast Research Portal Canadian Journal of Zoology 77 10 1505 1512 |
institution |
Open Polar |
collection |
Queen's University Belfast Research Portal |
op_collection_id |
ftqueensubelpubl |
language |
English |
description |
Spalinger and Hobbs proposed a mechanistic model of forage intake based on the mutually exclusive actions of biting and chewing. A necessary consequence of this model is that an animal postpones the intake of more food by biting when it is processing food by chewing. In previous work, the Spalinger–Hobbs model successfully predicted short-term intake in controlled experiments. Application of the model to an entire foraging bout requires the following assumptions: (i) biting and chewing are independent events; (ii) there are no periodicities in the length of consecutive bite or chew sequences; (iii) the average bite size is constant; and (iv) the bite rate does not change with the number of bites in the sequence. To test these assumptions, we videotaped entire foraging bouts of two free-ranging moose (Alces alces) feeding on dense swards of Epilobium angustifolium in midsummer. From these videotapes, we measured the time spent biting and chewing, the rates of biting and chewing, the frequency distributions of consecutive bite and chew sequences, and lengths of E. angustifolium shoots above the point of cropping. Plant samples were collected in order to determine bite mass. A total of 1050 bites and chews were analyzed for moose 1 and 1925 bites and chews for moose 2. For both moose, three chewing events occurred, on average, for each bite event. Given this 1:3 bite:chew ratio, the frequency distributions of consecutive bite and chew sequences were as expected from a geometric distribution of independent events. There were no time-series correlations or dominating frequencies in the lengths of bite and chew sequences. These findings fulfill the first three assumptions required to extend the Spalinger–Hobbs model to entire foraging bouts. However, the fourth assumption was not fulfilled, in that time spent per bite increased asymptotically with bite-sequence length. We therefore incorporated the effect of bite-sequence length on bite rate into the Spalinger–Hobbs model. The new model predicts that to simultaneously ... |
format |
Article in Journal/Newspaper |
author |
Pastor, John Standke, Katie Farnsworth, Keith Moen, Ron Cohen, Yosef |
spellingShingle |
Pastor, John Standke, Katie Farnsworth, Keith Moen, Ron Cohen, Yosef Further development of the Spalinger-Hobbs mechanistic foraging model for free ranging moose. |
author_facet |
Pastor, John Standke, Katie Farnsworth, Keith Moen, Ron Cohen, Yosef |
author_sort |
Pastor, John |
title |
Further development of the Spalinger-Hobbs mechanistic foraging model for free ranging moose. |
title_short |
Further development of the Spalinger-Hobbs mechanistic foraging model for free ranging moose. |
title_full |
Further development of the Spalinger-Hobbs mechanistic foraging model for free ranging moose. |
title_fullStr |
Further development of the Spalinger-Hobbs mechanistic foraging model for free ranging moose. |
title_full_unstemmed |
Further development of the Spalinger-Hobbs mechanistic foraging model for free ranging moose. |
title_sort |
further development of the spalinger-hobbs mechanistic foraging model for free ranging moose. |
publishDate |
1999 |
url |
https://pure.qub.ac.uk/en/publications/2a254d6b-6aed-40c6-aa29-43adeb9a05aa http://www.nrcresearchpress.com/doi/pdf/10.1139/z99-119 |
genre |
Alces alces |
genre_facet |
Alces alces |
op_source |
Pastor , J , Standke , K , Farnsworth , K , Moen , R & Cohen , Y 1999 , ' Further development of the Spalinger-Hobbs mechanistic foraging model for free ranging moose. ' , Canadian Journal of Zoology , pp. 1505–1512 . < http://www.nrcresearchpress.com/doi/pdf/10.1139/z99-119 > |
op_relation |
https://pure.qub.ac.uk/en/publications/2a254d6b-6aed-40c6-aa29-43adeb9a05aa |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1139/z99-119 |
container_title |
Canadian Journal of Zoology |
container_volume |
77 |
container_issue |
10 |
container_start_page |
1505 |
op_container_end_page |
1512 |
_version_ |
1799469910127017984 |