The petroleum does not stick to the kelp
because of the mucilage that kelp produces.
We refer to the mucilage as an "antifouling"
agent, which means it prevents a lot of organisms,
especially bacteria, but also oil products, from
adhering to the blades. Some kelp, like
Macrocystis, produce a lot of mucilage, while
other kelp do not. That is an interesting finding
that you observed bryozoans on kelp from petroleum
areas but not the non-petroleum; you might have
the basis for some new research!
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