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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ftunicapetownfig:oai:figshare.com:article/15000765 2023-05-15T13:58:59+02:00 Summary of an update of the Mori-Butterworth (2006) model of the krill-predator dynamics of the Antarctic ecosystem Naseera Moosa Doug Butterworth 2021-07-20T14:58:00Z https://doi.org/10.25375/uct.15000765.v1 https://figshare.com/articles/report/Summary_of_an_update_of_the_Mori-Butterworth_2006_model_of_the_krill-predator_dynamics_of_the_Antarctic_ecosystem/15000765 unknown doi:10.25375/uct.15000765.v1 https://figshare.com/articles/report/Summary_of_an_update_of_the_Mori-Butterworth_2006_model_of_the_krill-predator_dynamics_of_the_Antarctic_ecosystem/15000765 CC BY 4.0 CC-BY Biological Mathematics Applied Statistics Biostatistics krill-predator dynamics Antarctic ecosystem predator-prey dynamics krill blue whale fin whale humpback whale minke whale Antarctic fur seal crabeater seal Text Report 2021 ftunicapetownfig https://doi.org/10.25375/uct.15000765.v1 2022-01-11T13:19:38Z 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 Seal Antarctic Fur Seals Blue whale Crabeater Seal Fin whale Humpback Whale minke whale University of Cape Town: Figshare Antarctic Butterworth ENVELOPE(66.733,66.733,-70.700,-70.700) Pacific The Antarctic |
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Open Polar |
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University of Cape Town: Figshare |
op_collection_id |
ftunicapetownfig |
language |
unknown |
topic |
Biological Mathematics Applied Statistics Biostatistics krill-predator dynamics Antarctic ecosystem predator-prey dynamics krill blue whale fin whale humpback whale minke whale Antarctic fur seal crabeater seal |
spellingShingle |
Biological Mathematics Applied Statistics Biostatistics krill-predator dynamics Antarctic ecosystem predator-prey dynamics krill blue whale fin whale humpback whale minke whale Antarctic fur seal crabeater seal Naseera Moosa Doug Butterworth Summary of an update of the Mori-Butterworth (2006) model of the krill-predator dynamics of the Antarctic ecosystem |
topic_facet |
Biological Mathematics Applied Statistics Biostatistics krill-predator dynamics Antarctic ecosystem predator-prey dynamics krill blue whale fin whale humpback whale minke whale Antarctic fur seal crabeater seal |
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 |
Naseera Moosa Doug Butterworth |
author_facet |
Naseera Moosa Doug Butterworth |
author_sort |
Naseera Moosa |
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 |
publishDate |
2021 |
url |
https://doi.org/10.25375/uct.15000765.v1 https://figshare.com/articles/report/Summary_of_an_update_of_the_Mori-Butterworth_2006_model_of_the_krill-predator_dynamics_of_the_Antarctic_ecosystem/15000765 |
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 Seal Antarctic Fur Seals Blue whale Crabeater Seal Fin whale Humpback Whale minke whale |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Blue whale Crabeater Seal Fin whale Humpback Whale minke whale |
op_relation |
doi:10.25375/uct.15000765.v1 https://figshare.com/articles/report/Summary_of_an_update_of_the_Mori-Butterworth_2006_model_of_the_krill-predator_dynamics_of_the_Antarctic_ecosystem/15000765 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.25375/uct.15000765.v1 |
_version_ |
1766267343876390912 |