Rock Platforms: Subtidal Zone - The kelp, Macrocystis angustifolia
What might be the advantage to
Macrocystis of having bladders on its fronds?
prevent dessication
increase aeration
improve access to light
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No. While this is true for other algae, such as Hormosira, in Macrocystis the bladders are generally air, not fluid, filled. Try again.
No. Although the concentrations of oxygen and carbon dioxide are low compared with air, the constant movement of water ensures that supplies are adequate. Try again.
Yes. Light does not penetrate water to any great depth. Air-filled bladders increase buoyancy, keeping the photosynthetic fronds near the surface where light is more abundant.
