Walruses, belugas and narwhals are the most affected marine mammal species According to the preliminary results of an ongoing research where Joan Parera and Raquel Ubach are developing a new indicator for monitoring sea ice extent, seasonal sea ice is declining faster than perennial.
![](https://webs.uab.cat/interfase/wp-content/uploads/sites/535/2021/04/850px-SeaIce_PresenceLikelihood_Map-e1620214196406.jpg)