Multicellular Protists - San Diego Miramar College

Multicellular Protists - San Diego Miramar College

Multicellular Protists (algae) Primary producers Plant-like seaweeds Lack true leaves, stems & roots May be filamentous, grow in mats or crusts, sheets, or kelp Phaeophyta (browns) Rhodophyta (reds) Chlorophyta (greens) Phaeophyta Brown/yellow pigment Fucxanthin (& chl) Diverse morphologies Simple to large & complex

Upto 100m Fast growing kelp 1 to 2 feet a day Important source of algin Thickener, stabilizer, emulsifier in many products Rhodophyta Red pigments Phycobilins As a group, expands to greater depths than other algae Why?

Coralline algae CaCO3 in cell walls Defense and structure Encrusting Important component of coral reef environments Source of carrageenan & agar (emulsifiers & gel thickeners) Nori from Porphyra Chorophyta Green pigments Chl a & Chl b

Same as plants Diverse morphologies Filamentous Sheets Spongy Calcareous Important component of coral reef environments Kingdom Plantae Photoautotrophs Mostly terrestrial, few have adapted to marine environments

Seagrasses Eelgrass (subtidal), surf grass (rocky intertidal; surf zone) Provides home and protection to many spp. Cordgrasses Tolerant land plants Salt marsh habitats Mangroves Tolerant tropical trees & shrubs Provides habitat & protection for many tropical estuarine & intertidal spp.

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