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Dinoflagellates: Plantlike Protists

Biology report: Ibanez, Lim, Suanes
by

Tricia Suanes

on 28 October 2012

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Transcript of Dinoflagellates: Plantlike Protists

Dinoflagellates Camia: Ibanez. Lim. Suanes - Greek dinos "whirling" and Latin flagellum
"whip, scourge"
- phylum: Pyrrophyta
- habitat: ocean, fresh water, other organisms
(e.g. Tridacna gigas - giant clam)
- manner of reproduction (most): asexually
by binary fission
- only eukaryotes without histones
- autotrophs, phagotrophs, symbionts and
parasites; some taxa have more than one nutritional strategy (mixotrophic: e.g. species of Protoperidinium -parasitic & photosynthetic. General Characteristics - flagellum
- propels organism, spinning,
through the water
- wraps around the organism in
grooves between two thick
plates of cellulose
- generally have two
- transverse flagellum:
provides forward motion & spin; longitudinal flagellum: acts as a rudder Structures and Functions - photosynthetic -> primary producers
in aquatic ecosystems
- about half of the group is photosynthetic;
the other half lives as heterotrophs
- make up considerable part of the phyto-
plankton (photosynthetic, live in salt &
fresh water
- symbiotic relationships with types of
coral (allow tiny coral animals to use
the products pf photosynthesis)
- feed on waste products of some animals Ecology - many species are luminescent
- may give off light when agitated
- gives phylum it's name, Pyrrophyta
("fire plants")
- regulated by activity of enzymes
(luciferases) upon luminescent proteins (luciferins), requires oxygen
- can cause red tide (algal bloom)
- immediate increase in the amt. of algae
& other producers that are results from a large input of a limiting nutrient More facts... Plantlike Protists Examples of Dinoflagellates Gonyaulax and Gymnodinium
- "red tides", produce a poten-
tially dangerous toxin (can
cause illness, paralysis, death, especially for filter-feeding shell fish [e.g. clams])
Noctiluca scintillans
- very large marine, phagotro-
phic, dinoflagellate
- can cause pinkish red or
greenish red tides
- able to be bioluminescent
- can contain green eukaryotic
endosymbionts (Pedinomonas noctilucae)
Full transcript