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SC/68B/IA/001

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Resource details

Resource ID

17595

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Document Number

SC/68B/IA/001

Full Title

Further updated progress report: A multi-stock model for North Pacific sei whales

Author

Andre E. Punt

Document Type

Meeting Document

Publisher

International Whaling Commission

Publication Year

2020

Abstract

The age-, sex-, and season-structured population dynamics model developed to assess North Pacific sei whales is updated to allow for time-varying carrying capacity, distribution and natural mortality, and density-dependent distribution. The model can now utilize low abundance estimates, and tags for which the effective number of animals marked is unknown. Estimates of absolute abundance can be subject to additional variance related to changes in distribution among surveys. Base-case models are undertaken for single-stock and multi-stock hypotheses, along with a range of sensitivity tests. The results are summarized using numerical and graphical diagnostics.

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IWC Scientific Committee / Scientific Committee Meeting Papers / SC68B | Virtual Meetings 2020 / IA - Sub-committee on In-depth Assessmentss