生长于淡水中是重要的分解者.PPT

* (左)Diatom?-?矽藻 (右)kelp-昆布 unicellular, or multicellular?without specialized tissues plant-like? animal-like? fungus-like simple, typically?autotrophic?organisms, ranging from unicellular?to?multicellular?forms Most are?photosynthetic?like?plants, but they lack the many distinct cell and organ types found in?land plants All true algae have a?nucleus enclosed within a?membrane? Rhodophyta Heteromontophyta Chlorophyta Diatomaceae Cyanophyte is a?phylum?of?bacteria not Algae cells without flagella and centrioles with phycobiliproteins as accessory pigments (giving them red color) sexual reproduction Most rhodophytes are marine, generally prefer clean, running water contain the pigment?fucoxanthin, which is responsible for the greenish-brown color sexual or asexual reproduction adapted to a wide variety of marine ecological niches including the rock pools, the whole intertidal zone and relatively deep near shore waters. most with two?flagella?per cell almost all forms have chloroplasts contain chlorophylls a and b, giving them a bright green color (as well as the accessory pigments beta carotene and xanthophylls) green algae are eukaryotic organisms that follow a reproduction cycle called?alternation of generations. most diatoms are?unicellular the most common types of phytoplankton diatom cell wall made of silica (hydrated silicon dioxide) widespread in the oceans, freshwater, soils and damp surfaces Their yellowish-brown chloroplasts are containing pigments such as the carotenoid fucoxanthin. asexual binary division Protozoa Protozoa?are a diverse group of?unicellular?eukaryotic?organisms,?many of which are?motile. Originally,?protozoa?had been defined as unicellular?protists?with?animal-like behavior, e.g.,?movement. Protozoa were regarded as the partner group of protists to?protophyta, which have plant-like behaviour, e.g.,?photosynthesis. Protozoa were previously often grouped in the?kingdom?of?Protista, together with the?plant-like?algae?