The Importance of Being Algae Richard McCourt, Ph.D. DePaul University

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Presentation transcript:

The Importance of Being Algae Richard McCourt, Ph.D. DePaul University

Marine algae in Puerto Peñasco Basis of the intertidal food chain Shelter from environmental stress or predators Grow on the various kinds of surfaces found in the area – granites, beachrock, boulders Different divisions – greens, reds and browns Phaeophytes – the most prominent

Sargassum sp. Deep brown Blade-like fronds Seen floating – buoyed by hollow air bladders Can grow up to ~1 meter in height Shelter for fish and crustaceans

Padina sp. Fan-shaped fronds Common in tide pools As they age, red algae crusts form on fronds Also colonized by Anachis

Colpomenia sp. Thrive during winter Golden wads of chewing gum Grow on turfs of other algae on the reefs

Acetabularia sp. Found in the lower intertidal zones; sandy shores “Mermaid’s wine glass” Float on the water – look for patches of lime green

Seasonal Patterns Sargassum and Colpomenia in winter Padina in summer Release reproductive structures that exude spores/gametes into ocean

Conclusions So far, doing well Massive death of the sunstar, Heliaster kubinjii, reported several years ago Commercialism and eutrophication threaten the Sea of Cortez