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Data from: Disentangling direct and indirect determinants of the duration of maternal care in brown bears: environmental context matters
Van de Walle, Joanie — 2020-10-02 <p>The duration of maternal care, an important life history trait affecting population dynamics, varies greatly within species. Yet, our understanding of its predictors is limited, mostly correlative, and subject to misinterpretations, due to difficulties to disentangle the role of maternal- and offspring-related characteristics.</p> <p>We conducted path analysis on a dataset including 217 brown bear litters captured over a 29-year period in two populations in Sweden (“North” and “South”) facing contrasting environmental conditions to identify and quantify the causes of variation in the duration of maternal care (1.5 years or 5 years).</p>
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Spatiotemporal variation in pup abundance and preweaning survival of harbour seals (Phoca vitulina) in the St. Lawrence Estuary, Canada (2023)
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Renaud, Limoilou-Amelie; Pigeon, Gabriel; Van de Walle, Joanie; Bordeleau, Xavier; Hammill, Mike O.; Pelletier, Fanie — 2023-06-02 <p class="MsoNormal"><span lang="EN-CA">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 (<em>Phoca vitulina</em> 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% CI: 204, 218] at Métis. Preweaning survival was generally higher at Bic (0.73 [95% CI: 0.58,0.82]) than at Métis (0.68 [95% CI: 0.52,0.79]). We hypothesize that differences between habitats and human disturbance contribute to lower preweaning survival at Métis, but behavioural studies are needed to understand the impacts of disturbance on mother-pup interactions during the nursing period. </span></p>

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(auteur : Van de Walle, Joanie)

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