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BIOL2204 Plankton

QuestionAnswer
What are diatoms? unicellular algae with a rigid, glass-like cell wall made of silica, called a frustule
What does a frustule consist of? 2 overlapping halves (thecae)
What does the thecae consist of? epitheca (larger half), hypotheca (smaller half) each theca has a valve, girdle bands and fine markings called striae
Diatom shapes centric diatoms (circular, cylindrical, disc-shaped, radial symmentry) pennate (elongated, bilateral symmetry, slit called a raphe)
General shape/form Occur as single cells, chains or colonies. Chain-forming species may have spines/setae that help connect neighbouring cells
Diatom Key Features - rigid, glass-like silica frustule - circular/disc-like or elongated forms - radial symmetry in centric forms, bilateral symmetry in pennate forms - fine striae/surface patterns - single cells or chains - spines/setae in some species - raphe
Two types of dinoflagellates Thecate: armor-like covering made of cellulose plates Athecate: no plates
Dinoflagallate grooves 2 grooves - cingulum: transverse groove containing transverse flagellum - sulculus: longitudinal groove containing longitudinal flagellum
Dinoflagallate Key Features - thecal plates in armoured forms/smoother covering in athecates - transverse cingulu + longitudinal sulcus - horns or other projections - no silica frustule
Morphology = feeding strategy fine setae, cilia, filtering structures = suspension feeding grasping/piercing structures = predators Careful - longer antennules are sensory Copepods can be both, chaetognaths are active predators
Always planktonic holoplankton
only part of the lifestyle is planktonic (eggs or larvae) meroplankton
Most abundant holoplankton planktonic copepods (naplius -> copepodite -> adult)
Planktonic larvae feeding types Planktotrophic: feed while in the plankton phase Lecithotrophic: rely mainly on yolk supplied in the egg
Created by: mishm
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