The Shifting Drivers of Harp Seal Population Dynamics
A new integrated population model reveals a pivotal shift in the primary threats to Northwest Atlantic harp seals. For decades, human harvest was the dominant driver of population trends. However, since the 1980s, the relative impact of harvest mortality has declined while natural mortality, particularly for young-of-the-year (YOY) seals, has surged. The study, published in Ecological Applications, used a hierarchical Bayesian model to partition mortality across seven decades, finding that climate-related hazards, specifically deteriorating sea ice conditions, have become one of the strongest drivers of YOY mortality since 2000. This research underscores how climate change is fundamentally altering the ecological pressures on marine wildlife, with projections indicating these environmental factors will dominate future population dynamics, directly impacting sustainable management and conservation strategies for this key Arctic species.
Study Significance: This research provides a critical framework for understanding how multiple, concurrent threats interact to shape wildlife population dynamics, a central concern in conservation biology and ecosystem management. For professionals focused on biodiversity, population modeling, and climate impact assessments, it demonstrates the necessity of moving beyond single-threat models to integrated approaches that can disentangle anthropogenic and environmental pressures. The findings have direct implications for setting sustainable harvest levels under changing climatic conditions and highlight the growing importance of climate resilience in wildlife management and policy.
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