Sea otters to get another chance in Oregon and Northern California - High Country News (www.hcn.org)

submitted 6 days ago by Salamence@lemmy.zip to c/biodiversity@mander.xyz

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cross-posted from: https://hexbear.net/post/5248565

If you could walk the ocean floor off the coast of Cape Arago in Oregon in the summer, you’d find yourself in the mysterious green depths of a forest of kelp. Look up, and you’d see sunlight filtering through the fronds waving in the current; look down, and you’d see the plants anchored to an ocean floor covered with life. But if you walked a little bit farther, you’d come to a barren clearing, no sign of kelp or much else — just a carpet of purple sea urchin, a creature that is devouring kelp at an alarming rate.

The disappearance of kelp forests is widely felt here; gray whales have changed their foraging patterns, and the red abalone fishery in Northern California closed after swarms of urchins and warming waters destroyed more than 90% of the kelp forests there. In Oregon, a 2024 study by the Oregon Kelp Alliance found that over a 12-year period, the kelp forest off the coast declined by up to 73%, primarily due to an out-of-control population of purple sea urchins, which graze on the kelp. This system is out of balance largely owing to the absence of a keystone species: xvlh-t’vsh, which means “sea otter” in the Athabaskan language of the Confederated Tribes of Siletz Indians. For more than 20 years, the Siletz Tribe has been working to reintroduce sea otters.

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this post was submitted on 13 Jun 2025

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Biodiversity

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Biodiversity is a term used to describe the enormous variety of life on Earth. It can be used more specifically to refer to all of the species in one region or ecosystem. Biodiversity refers to every living thing, including plants, bacteria, animals, and humans. Scientists have estimated that there are around 8.7 million species of plants and animals in existence. However, only around 1.2 million species have been identified and described so far, most of which are insects. This means that millions of other organisms remain a complete mystery.

Over generations, all of the species that are currently alive today have evolved unique traits that make them distinct from other species. These differences are what scientists use to tell one species from another. Organisms that have evolved to be so different from one another that they can no longer reproduce with each other are considered different species. All organisms that can reproduce with each other fall into one species. Read more...

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