bull kelp and sea uchins photo
XN0075-D. Bull Kelp (Nereocystis luetkeana) off the coast of Oregon. The amazing, tree-like plants float up to the surface, buoyed by air-filled bladders from which fronds or blades extend. Though fast growing, kelp is suffering along the coast of Oregon and California (northern and central) where much of it has disappeared, devoured by purple sea urchins (Stronglyocentrotus purpuratus) shown here in the background. Purple urchin populations have exploded in the absence of sea star predators and during years with warm water events which negatively impact kelp recruitment and general health. It is likely only a matter of time before these urchins feed on this bull kelp plant. Drake Point, South Cove Cape Arago, Oregon, USA, Pacific Ocean.
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