[MARMAM] New article: Demographic parameters of a free-ranging deep-diving cetacean, the long-finned pilot whale
philippeverborgh at yahoo.fr
Mon Oct 26 11:18:50 PDT 2020
We apologise for cross posting and are pleased to share our new article:
Verborgh, P., Gauffier, P., Esteban, R. and de Stephanis, R. (2020). Demographic parameters of a free-ranging deep-diving cetacean, the long-finned pilot whale. Marine Mammal Science. DOI: 10.1111/mms.12752 Abstract:
Demographic parameters provide baselines to estimate future population trajectories which can then be used in management decisions. The aim here was to estimate demographic parameters of long-finned pilot whale (Globicephala melas) from the Strait of Gibraltar by fitting mark-recapture models to photo-identification data of pri- mary and secondary marked individuals. These parameters were used to forecast the future population trajectories in a population viability analysis (PVA) given different scenarios of demographic rates. Survival rate increased with age from 0.629, 95% CI [0.409, 0.805] for calves, 0.869, 95% CI [0.758, 0.934] for juveniles, to 0.972, 95% CI [0.953, 0.983] for adults. A preliminary mean observed interval of viable calves was 4.5 years. The PVA estimated the population would persist over 100 years with a 100% probability for all scenarios except those with lower 95% CI survival values, for which the probability of extinction reached 100%. Popu- lation growth rate was negative in all scenarios except those with 95% CI upper survival values. Interbirth interval and juvenile survival were found most influential and depended on the correct identification of secondary marked (e.g., calves and juveniles) individuals on a long-term basis. This population was found in a precarious state prior to a morbillivirus outbreak that might even more endanger its long-term viability.
The article can be accessed in the following link: https://onlinelibrary.wiley.com/doi/10.1111/mms.12752
Or by request at my email: philippeverborgh(a)gmail.com
Philippe Verborgh and co-authors
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