Abstract

Arctic marine mammals range widely, serve as biological indicators, occupy areas rich in natural resources, and are an important subsistence resource. Eleven species of Arctic marine mammals are highly associated with, or dependent on, sea ice for key aspects of their life history including foraging, reproduction, and movement. Approximately 24 other species forage in the Arctic seasonally. Climate change is the primary threat to Arctic marine mammals although its effects are expected to vary in time, space, and among species. For example, loss of sea ice may reduce foraging habitat for polar bears or breeding habitat for pinnipeds, but may also increase access to foraging areas for some cetaceans. Sea ice dynamics in the Arctic influence energy fluxes, biological production, and ultimately the survival of species at higher trophic levels, yet many ecological consequences of continued sea ice loss remain unclear. Other conservation challenges for Arctic marine mammals include increasing resource extraction, shipping, and human development.

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