Summary of an update of the Mori-Butterworth (2006) model of the krill-predator dynamics of the Antarctic ecosystem
The Mori-Butterworth (2006) model of the krill-predator dynamics of the Antarctic ecosystem is refined in Moosa (2017). Updates to and the revision of abundance and trend information are summarized. Key features of the updated and refined model are the inclusion of a depensatory effect for the Antar...
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ftdatacite:10.25375/uct.15000765.v1 2023-05-15T13:40:21+02:00 Summary of an update of the Mori-Butterworth (2006) model of the krill-predator dynamics of the Antarctic ecosystem Moosa, Naseera Butterworth, Doug 2021 https://dx.doi.org/10.25375/uct.15000765.v1 https://zivahub.uct.ac.za/articles/report/Summary_of_an_update_of_the_Mori-Butterworth_2006_model_of_the_krill-predator_dynamics_of_the_Antarctic_ecosystem/15000765/1 unknown University of Cape Town https://dx.doi.org/10.25375/uct.15000765 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY 10401 Applied Statistics FOS Mathematics 10202 Biological Mathematics 10402 Biostatistics Other Report report 2021 ftdatacite https://doi.org/10.25375/uct.15000765.v1 https://doi.org/10.25375/uct.15000765 2021-11-05T12:55:41Z The Mori-Butterworth (2006) model of the krill-predator dynamics of the Antarctic ecosystem is refined in Moosa (2017). Updates to and the revision of abundance and trend information are summarized. Key features of the updated and refined model are the inclusion of a depensatory effect for the Antarctic fur seals in the krill and predator dynamics, and the imposition of bounds on K_a (the carrying capacity of krill in Region a, in the absence of its predators); these lead to a better fit to the data overall. A particular difference in results compared to those from the Mori-Butterworth model is more oscillatory behaviour in the trajectories for krill and some of its main predators. This likely results from the different approach to modelling natural mortality for krill (which decreases the residual mortality remaining after taking account of consumption by the main predators) and warrants further investigation. That may in turn resolve a key mismatch in the model which predicts minke whale oscillations in the Indo-Pacific region to be out of phase with results from a SCAA assessment of these whales. A number of other areas for suggested future research are listed. Report Antarc* Antarctic Antarctic Fur Seals minke whale DataCite Metadata Store (German National Library of Science and Technology) Antarctic Butterworth ENVELOPE(66.733,66.733,-70.700,-70.700) Pacific The Antarctic |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
10401 Applied Statistics FOS Mathematics 10202 Biological Mathematics 10402 Biostatistics |
spellingShingle |
10401 Applied Statistics FOS Mathematics 10202 Biological Mathematics 10402 Biostatistics Moosa, Naseera Butterworth, Doug Summary of an update of the Mori-Butterworth (2006) model of the krill-predator dynamics of the Antarctic ecosystem |
topic_facet |
10401 Applied Statistics FOS Mathematics 10202 Biological Mathematics 10402 Biostatistics |
description |
The Mori-Butterworth (2006) model of the krill-predator dynamics of the Antarctic ecosystem is refined in Moosa (2017). Updates to and the revision of abundance and trend information are summarized. Key features of the updated and refined model are the inclusion of a depensatory effect for the Antarctic fur seals in the krill and predator dynamics, and the imposition of bounds on K_a (the carrying capacity of krill in Region a, in the absence of its predators); these lead to a better fit to the data overall. A particular difference in results compared to those from the Mori-Butterworth model is more oscillatory behaviour in the trajectories for krill and some of its main predators. This likely results from the different approach to modelling natural mortality for krill (which decreases the residual mortality remaining after taking account of consumption by the main predators) and warrants further investigation. That may in turn resolve a key mismatch in the model which predicts minke whale oscillations in the Indo-Pacific region to be out of phase with results from a SCAA assessment of these whales. A number of other areas for suggested future research are listed. |
format |
Report |
author |
Moosa, Naseera Butterworth, Doug |
author_facet |
Moosa, Naseera Butterworth, Doug |
author_sort |
Moosa, Naseera |
title |
Summary of an update of the Mori-Butterworth (2006) model of the krill-predator dynamics of the Antarctic ecosystem |
title_short |
Summary of an update of the Mori-Butterworth (2006) model of the krill-predator dynamics of the Antarctic ecosystem |
title_full |
Summary of an update of the Mori-Butterworth (2006) model of the krill-predator dynamics of the Antarctic ecosystem |
title_fullStr |
Summary of an update of the Mori-Butterworth (2006) model of the krill-predator dynamics of the Antarctic ecosystem |
title_full_unstemmed |
Summary of an update of the Mori-Butterworth (2006) model of the krill-predator dynamics of the Antarctic ecosystem |
title_sort |
summary of an update of the mori-butterworth (2006) model of the krill-predator dynamics of the antarctic ecosystem |
publisher |
University of Cape Town |
publishDate |
2021 |
url |
https://dx.doi.org/10.25375/uct.15000765.v1 https://zivahub.uct.ac.za/articles/report/Summary_of_an_update_of_the_Mori-Butterworth_2006_model_of_the_krill-predator_dynamics_of_the_Antarctic_ecosystem/15000765/1 |
long_lat |
ENVELOPE(66.733,66.733,-70.700,-70.700) |
geographic |
Antarctic Butterworth Pacific The Antarctic |
geographic_facet |
Antarctic Butterworth Pacific The Antarctic |
genre |
Antarc* Antarctic Antarctic Fur Seals minke whale |
genre_facet |
Antarc* Antarctic Antarctic Fur Seals minke whale |
op_relation |
https://dx.doi.org/10.25375/uct.15000765 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.25375/uct.15000765.v1 https://doi.org/10.25375/uct.15000765 |
_version_ |
1766132630009413632 |