Polynya
Definition
A polynya is an area of persistent open water surrounded by sea ice, maintained by wind, ocean currents, or upwelling warm water. Polynyas are critical feeding sites for Antarctic penguins because they provide access to the ocean in otherwise ice-locked environments. Emperor penguins often establish colonies near reliable polynyas so that foraging adults can reach open water without crossing vast distances of sea ice. As climate change alters sea-ice dynamics, some polynyas are becoming larger or appearing in new locations, potentially disrupting established colony sites.
Related Terms
Fast ice is sea ice that is anchored ("fastened") to the coastline, ice shelves, or the sea floor and does not move with winds or currents.
Upwelling is an oceanographic process in which cold, nutrient-rich water rises from the deep ocean to the surface, typically driven by wind patterns or the shape of the coastline.
Sea ice extent refers to the total area of ocean covered by sea ice at a given time, and it is one of the most important environmental variables for Antarctic penguin species.
Related Species
Species where polynya is especially relevant.
Frequently Asked Questions
What does polynya mean in penguin biology?
A polynya is an area of persistent open water surrounded by sea ice, maintained by wind, ocean currents, or upwelling warm water. Polynyas are critical feeding sites for Antarctic penguins because they provide access to the ocean in otherwise ice-locked environments. Emperor penguins often establish colonies near reliable polynyas so that foraging adults can reach open water without crossing vast distances of sea ice. As climate change alters sea-ice dynamics, some polynyas are becoming larger or appearing in new locations, potentially disrupting established colony sites.