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- Title
An observed decline in the mark rate of Hector's dolphins at Banks Peninsula, New Zealand.
- Authors
Wickman, Lindsay; Rayment, William; Slooten, Elisabeth; Dawson, Stephen M.
- Abstract
For example, if mark rate has declined over the course of a study, scaling up abundance using an estimate of mark rate from the early part of the study will negatively bias estimates of abundance from the later part. Because this period was relatively soon after establishment of the Banks Peninsula Marine Mammal Sanctuary, this estimate could reflect a mark rate that includes a relatively higher rate of injuries from nonfatal encounters with fishing gear than the present. Without an updated estimate of mark rate from 2016, our estimate of mark rate would be biased high and hence abundance estimates derived from recent photo-ID data analyses would be biased low. The difference in mark rate between periods for each iteration of the model was calculated as the estimate of mark rate from 2016 subtracted from the estimate of mark rate during the period 1992-1996.
- Subjects
NEW Zealand; BOTTLENOSE dolphin; DOLPHINS; MARINE mammal populations; WHITE shark; AQUATIC mammals; MARINE mammals; PENINSULAS
- Publication
Marine Mammal Science, 2021, Vol 37, Issue 4, p1544
- ISSN
0824-0469
- Publication type
Article
- DOI
10.1111/mms.12826