Is the length distribution of C1 and C3 humpback whale catches consistent with an age-structured version of the resident model
A sex- and age-structured BALEEN II population model is fitted to population abundance and trend as well as photo-id capture-recapture data for the C1 and C3 humpback whale breeding sub-stocks. The model is of the “Resident” type, i.e. no interchange between breeding grounds, though the whales do mi...
| Main Authors: | , , |
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| Format: | Report |
| Language: | English |
| Published: |
University of Cape Town
2009
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| Subjects: | |
| Online Access: | http://hdl.handle.net/11427/19657 https://open.uct.ac.za/bitstream/11427/19657/1/M%c3%bcller_Is_length_distribution_2009.pdf |
| Summary: | A sex- and age-structured BALEEN II population model is fitted to population abundance and trend as well as photo-id capture-recapture data for the C1 and C3 humpback whale breeding sub-stocks. The model is of the “Resident” type, i.e. no interchange between breeding grounds, though the whales do mix on the feeding grounds. Uniform selectivity on the 1+ population is assumed for both regions. A particular aim is to address the question of whether length distribution differences between the two regions are a reflection of different levels of past exploitation. Comparison with length distribution data for both regions does however indicate a greater proportion of larger males than anticipated in the C3 catches, and the reverse effect for both males and females in the C1 catches. |
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