Lessonia nigrescens

Lessonia nigrescens, the grey weed or giant grey weed, is a South American kelp species in the genus Lessonia.

There is at least two populations of the seaweed, marked by the difference in phenolic content. There is a subtidal population with higher phenol content and an intertidal population with a lighter phenol content. The difference in the phenolic content can be explained by the herbivory selection pressure due to the sea snail Tegula tridentata.





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