An intruder has been detected in the Canadian Arctic for the first time, and it’s not good news for the health of our planet. The bay barnacle is a known invasive species that’s been making its unwelcome mark on European waters and the Pacific ocean, disrupting ecosystems as it spreads. There was a time we thought Arctic waters were too cold for invasive species like this to move in, but apparently that is no longer the case. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

A new study describes the first effort to use environmental DNA (eDNA) metabarcoding as a way to analyze a single water sample for evidence of species living in the Canadian Arctic. The approach works because, as living things move through water, they leave behind

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