haptophyta Flashcards
(15 cards)
have they gone through primary or secondary endosymbiosis
Haptophytes contain complex plastids derived from secondary endosymbiosis meaning their chloroplasts originate from an ancestral red algal symbioant.
what is a haptonema
Haptonema (look in diagram above)
- Threadlike extention
- Ultrastructure different form flagella
FUNCTION:
- Feeding- sticky cup for capturing food
- Presence of haptonema correlates with phaotropic behavior
- Aids in attachment to surfaces
what is the process of coccolith production?
cocclithogenesis
impact on carbon cycle
- Productionof coccoliths require utake of dissolved inorganic C and Ca
- Calcium carbonate and carbon dioxide are produced from calcium and bicarbonate
- The production of calcium carbonate drives surface alkalinity down and in conditions of low alkalinity the CO2 is instead released back on the atmosphere
reproduction
Reproduction
Asexual
- Fission into 2 daughter cells
Sexual
- Poorly studied, very little known
- Haplodiplontic- alternation of generations
whats a harmful types of haptophyta
Emiliania huxleyi
- Consmoplitian, howver most abundant in nutrient rich temperat water
- Often occurs in blooms
- Can release gas which react swith oxygen in the air to produce sulphur oxides
- Clouds condense on these particles
- May have an imact on atmospheric chemistry and climate regulation
main pigments
chlorophyll a, c1, c2,c3 Fucoxanthin
storage products
chrysolamniaran
flagella
typically 2 flagella without hairs plus haptonema (middle appendage)
morphology
unicellular flagellates (may have amoeboid, coccoid, palmelloid or filamentous stages)
plastids
thylakoids stacked in 3’s
chloroplast enclosed by CER
plastid has 4 membranes
cell covering
cell is covered with organic (cellulose) scales or calcified coccoliths
No. of species
about 500 species, almost totally marine
habitat
nanoplankton
represetative genera
Emiliania, phaeocystis, pleurochrysis, discosphaera, pavlova, chrysochromulina
