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29 Cards in this Set

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Define algae

Group of mostly photosynthetic organisms that are not necessarily related

Uses of algae in nature

Habitats, shelter, food , symbiotic relationships

Rule of thumb for amount of plants and animals

10g of plant for 1g of animal

What is an algae

A polyphyletic assemblage of organisms that can grow up to 25m. Lack reproductive features of land plants. Mostly photosynthetic

Primary chloroplast

Red algae, plants ect

Secondary chloroplast

Original prokaryote (ate a chloroplast and was eaten itself

Algal habitats

Pelagic, planktonic, nektonic, benthic, terrestrial,symbiotic

Pelagic

Free water

Planktonic

Floats in currents

Nektonic

Swim (ie with flagellae)

Benthic

Bottom dwelling

Can algae sink

Yes. Dead cells sink faster. Sone form chains to slow sinking, ie diatoms

How do algae defend themselves

Spines, armour, toxins, cyst formation, motility, transparency, luminescence

Motility of algae

Being able to find up and down. Photo, geo and chemotactic responses. Can detect nutrients, prey, UV.

Can algae move

Yes, wit cilia, flagella or pseudopodia, gliding, gas vesicles

Coenocytes

Multinucleate tubes

3D structures

Parenchyma

Chains of algae

Filaments

Sheets of algae

Membranes

Algal blooms

Cause fish and invertebrate deaths- stick in gills, lack of O2

Type of algae

Averages, stramenophiles, brown, red, green algae

Alveolates- name, characteristics and dangers

Dinoflagellates: unicellular, can be endosymbionts, chloroplasts. 2 flagellae, membrane sacs, cellulose plates


Fish poisoning, turtle cancers, paralytic shellfish syndrome


Stramenophiles- name, characteristics and dangers

Diatoms. Bilateral symmetry, photosynthetic, act as C to sink to floors.


Unicellular, no flagella, chlorophyll, fresh and salt water, sexual and asexual reproduction.


Amnesic shellfish poisoning, kills seals

Brown Algae- name, characteristics and dangers

Looks like seaweed, micro to macro, important habitats, rocky shores, temperate, most complex anatomy, 2 flagella (only in reproductive stages),asexual and sexual.

Parts of a brown algae

Thallus, holdfast, blades, float, stipe, frond

What eats brown algae

Echinoids

Uses of brown algae

Fertilises, stock feed, human food

Red algae- name, characteristics and dangers

At depth. Uni and multicellular, no flagella, asexual and sexual, calcareous thallus, edible.

Green algae- name, characteristics and dangers

Closest to land plants, marine and freshwater, uni, multi, symbiotic, colonial