Golden Algae

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golden algae

[′gol·dən ′al·jē]
(botany)
The common name for members of the class Chrysophyceae.

Golden Algae

 

(Chrysophyta), a phylum of lower plants. They are unicellular, colonial, or, more rarely, multicellular (disklike, threadlike, or fruticose), primarily freshwater organisms up to 2 cm long, either free-floating or attached. Their chloroplasts are golden yellow or brown; this is caused by the presence of the yellow pigments phycochrysin, β-carotene, lutein, and diatomin, in addition to chlorophyll. Their assimilation product is leucosin and, more rarely, fats and oil. Golden algae include heterotrophic organisms, some of which are capable of holozoic nutrition. The majority of unicellular golden algae are mobile, with one, two, and sometimes three or four, flagella or pseudopods, contractile vacuoles, and an ocellus; some are covered with a test of scales or are enclosed in a case. Golden algae reproduce by cell division and zoospores; a sexual process occurs in only a few species. The organisms can form silicaceous cysts. About 70 genera with more than 300 species are found in freshwater habitats of the USSR.

IU. E. PETROV

References in periodicals archive ?
The increased number of chrysophyte cysts compared to diatoms strongly supports the change in the lake environment and might also be related to reduced light availability.
The highest abundances of chrysophytes occur between 5 and 10 cm depth, and those of diatoms are found in the core top, corresponding to the most recent accumulation (Fig.
This is indicated in diatom stratigraphy by diatom species and chrysophyte cysts living in small shallow hard-water lakes.
The number of scale-bearing chrysophyte taxa observed per sample varied from zero to six (Table 1).
The biovolume of chrysophytes and cyanobacteria was not significantly different among treatments (Table 1).
The phylogenies based on ultrastructure and 16S-like rRNA sequence comparisons are similar with respect to the exclusion of dinoflagellates and prymnesiophytes from the chromophyte/oomycete assemblage as well as the clustering of chrysophytes and synurophytes.
The chrysophyte Isochrysis galbana was added to each vial (in triplicate) at the beginning of the incubation period to establish the following cell concentrations: 50, 100, 200, or 300 cells/[micro]L.
Pigment Algal group Chl a all algae Chl b chlorophytes Chl c chrysophytes, diatoms, dinoflagellates [Beta]-carotene all algae Alloxanthin cryptophytes Diatoxantbin diatoms, few chrysophytes Fucoxanthin chrysophytes, diatoms, some dinoflagellates Lutein chlorophytes, euglenoids Zeaxanthin cyanobacteria Oscillaxanthin(*) filamentous cyanobacteria Peridinin dinoflagellates * Includes oscillaxanthin, 4-keto-myxoxanthophyll, and aphanizophyll.
Among the most frequent organisms belonging to other groups are the chrysophyte Distephanus [= Dictyocha] speculum and haptophytes of the genus Phaeocystis.
Relationship Between phototrophy and phagotrophy in the mixotrophic chrysophyte Poteriochromonas malhamensis.
The ecology of chrysophyte flagellates: their growth and perennation strategies as freshwater phytoplankton.
Pringsheim 1952), but its importance was not recognized until Bird and Kalff (1986) reported that the chrysophyte Dinobryon caused [approximately equal to]30% of the bacterial grazing losses in a lake.