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Biology of Seaweeds – Kelp Beds and Forests PowerPoint PPT Presentation


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Biology of Seaweeds – Kelp Beds and Forests. Biology of Seaweeds – Kelp Beds and Forests. Kelp is the collective term referring to very large brown algae dominating cold water regions of the earth. Biology of Seaweeds – Kelp Beds and Forests. If the algae do not form a

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Biology of Seaweeds – Kelp Beds and Forests

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Biology of Seaweeds – Kelp Beds and Forests


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Biology of Seaweeds – Kelp Beds and Forests

Kelp is the collective term referring to very large brown algae dominating

cold water regions of the earth.


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Biology of Seaweeds – Kelp Beds and Forests

If the algae do not form a

surface canopy, the algal

communities are referred to

as kelp beds.

If the algae do form a

surface canopy, the algal

communities are referred to

as kelp forests.


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Biology of Seaweeds – Kelp Beds and Forests

Kelp beds are dominated by the genera Laminaria, Pterygophora, and Ecklonia.

Kelp forests are dominated by the genera Macrocystis and Nereocystis.

In contrast to most algae, the kelp forest algae grow to 30 meters or more.

These algae actually block most of the sunlight, resulting communities of

“understory” algae forming layers bellow them…

Kelp forest communities are also highly productive areas;

e.g. Nereocystis luetkeana has been recorded with growth rates of 6 cm/day

and Macrocystis pyrifera commonly grows 50 cm/day or more…


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Biology of Seaweeds – Kelp Forests and their“Understory” Communities

1. Small filamenous

species.

2. Bottom-canopy

plants.

3. Understory-canopy

plants.

4. Midwater and

surface-canopy

plants.


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Biology of Seaweeds – Life cycle of typical kelp

In case of Macrocystis, the typical large plant seen is actually the asexual sporophyte

generation… (note that this is not the case for all algae…)

Typical alternation of generations…


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Biology of Seaweeds – Kelp Forests Ecosystems


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Typical zonation and distribution

of organisms in various California

kelp forests…


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