A new study says a change in the algae growing in Great Slave Lake is marking a 'new ecological regime' in North America's deepest lake. It'll 'definitely' have an effect throughout the food web, says one of the study's authors, but we don't know exactly what that'll be yet.
The small-celled planktonic diatom algae that have replaced the chain-forming diatoms do better under these conditions, said Smol. The sheer amount of algae in the lake are also increasing because more light means more photosynthesis — fostering growth.
Kathleen Rühland, the study's lead author and a senior scientist at the Paleoecological Environmental Assessment and Research Lab, said in a media release that big shifts like this are a "sure sign that the entire lake is changing and changing fast." Researchers were able to track the change in the algae by studying sediment cores that had been hauled up from the bottom of the 600-metre deep lake in 2014 and the 1990s.
Researchers were able to document the type of algae that was in the lake at different times, because remains of those organisms are in the sediment cores. Smol said diatoms are a "very common" type of algae which are well-preserved in lake sediment, and the presence of different species act as indicators of lake conditions — including its ice cover.
"So, what's the implication for whitefish populations that depend on eating those organisms?" she asked. "We just don't know who is going to be able to adapt to the new system, the new food supply, for example, and those that will potentially go extinct."
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