Spatiotemporal variation in pup abundance and preweaning survival of harbour seals (Phoca vitulina) in the St. Lawrence Estuary, Canada (2023) ...

• Main Authors: Renaud, Limoilou-Amelie, Pigeon, Gabriel, Van De Walle, Joanie, Bordeleau, Xavier, Hammill, Mike O., Pelletier, Fanie
• Format: Dataset
• Language: English
• Published: Dryad 2023
• Subjects: FOS Biological sciences; abundance; bayesian analysis; capture-mark-recapture CMR; Harbour seal; Phoca vitulina; Marine mammals; Population dynamics; Canada; harbour seal
• Online Access: https://dx.doi.org/10.5061/dryad.j9kd51chr; https://datadryad.org/stash/dataset/doi:10.5061/dryad.j9kd51chr

Marine mammal populations worldwide greatly benefitted from conservation measures put in place since the 1970s following overexploitation, and many pinniped populations have recovered. However, threats due to bycatch, interspecific interactions or climate change remain, and detailed knowledge on vital rates, population dynamics and their responses to environmental changes is essential for efficient management and conservation of wild populations. In this study, we quantified pup abundance and survival of individually marked harbour seal (Phoca vitulina Linnaeus, 1758) pups during the preweaning period at Bic Island and Métis sites in the St. Lawrence Estuary from 1998 – 2019. We used mark-recapture models to evaluate competing hypotheses regarding variation in daily preweaning survival rates and capture probability during the pups’ first 30 days of life. Pup abundance increased from 76 (95% CI: [59, 101]) to 323 [95% CI: 233, 338] in the past two decades at Bic Island and from 66 [95% CI:47, 91] to 285 [95% ...