Image Credit: Abigail McQuatters-Gollop, CC BY 2.0, Image Cropped
For the past three and a half years, the UK has been trawled through the political benthic sludge that is Brexit. With a second general election in two years arriving this Thursday, some sort of resolution finally seems to be on the horizon. And while much of the public discourse has focussed on the potential implications for Brexit following the election, climate change and the environment have also featured heavily.
This fox has tracked down his next meal by listening for sounds in the subnivium. Image Credit: Yellowstone National Park, Public Domain Mark 1.0, Image Cropped.
Sometimes the hardest places to access are the most interesting places to study. Take the subnivium, a temporary ecosystem that forms each winter in the small space between the snowpack and the ground.
Are polar bear habitat resource selection functions developed from 1985-1995 data still useful? (2019) Durner et. al, Ecology and Evolution, https://doi.org/10.1002/ece3.5401
Ecologists often attempt to predict where species are using the spread of the resources that the species depends upon. This is done because often it’s simply easier to monitor the resources than the species. Resource selection functions (RSFs) are a tool which use the likelihood of a resource being used to predict a species distribution. However, if the landscape the resource is found in changes drastically, a resource selection function may start to be less useful.
In the early 2000s, using data collected in the 80s and 90s, US scientists developed RSFs for polar bears, a species which has regrettably become the poster child for the survival of the Arctic ecosystem. Even back then, the bears’ preferred habitat was receding. Now, with human-driven climate change severely reducing sea ice and markedly altering the bears’ habitat, this week’s authors wanted to know how well those RSFs work nowadays.
Image Credit: Christopher Michel, CC BY 2.0, Image Cropped, Brightened
It’s an image that is ubiquitous in the media when the words ‘climate change’ pop up. The lone polar bear, drifting through the sea on a single ice floe. It is an effective image, evoking emotions like pity, loneliness and general despair for the plight of what has become the flagship species of what seems like the entire Arctic. But is associating the health of an entire ecosystem with one species useful, or dangerous?
Image Credit: US National Park Service, Public Domain Mark 1.0, Image Cropped
Ice has become (pardon the pun) something of a hot topic lately.
Professional and amateur scientists alike have studied the timing of seasonal ice formation on lakes and rivers for hundreds of years, and the patterns that have emerged from these studies provide a window into the progression of climate change. Overwhelmingly, the data show that lakes and rivers are freezing up later in the winter and their ice cover is melting earlier in the spring than in the past.