Lec8, Diatoms Flashcards
surrounded by two membrane and outer membrane of chloroplast endoplasmic reticulum being continuous with the outer membrane of the nuclear membrane.
Chloroplast in diatom
give golden brown colour to diatoms.
chlorophyll a, c1 and c2 along with fucoxanthin (carotenoid)
is the main storage product of diatoms.
Chrysolaminarin (β-1,3-linked glucan)
Diatoms move in
series of curves and zigzags.
Under stress conditions the cell wall of some diatoms such as Ditylum, become thick, thus forming ………….
dormant or resting spores
diatoms release specific chemicals to defend themselves from many predators such as copepods
Skeletonema
diatoms show shellfish poisoning such as ….
- Nitzschia
- Pseudonitzschia
- Amphora
identified as producers of domoic acid, a neurotoxin affecting
Pseudo-nitzschia and Amphora
are algal blooms composed of phytoplankton known to naturally produce biotoxins, they can occur when certain types of microscopic algae grow quickly in water, forming visible patches that may harm the health of the environment, plants, or animals
Harmful algal blooms (HABs)
Harmful algal blooms (HABs) causes:
- deplete the oxygen
- block the sunlight
- Some HAB-causing algae release toxins that are dangerous to animals and humans.
Harmful algal blooms (HABs) causes:
- deplete the oxygen
- block the sunlight
- Some HAB-causing algae release toxins that are dangerous to animals and humans.
- heterokontophyta
- primary producer
- live epiphytically
- free floating microorganism of marine or freshwater
- planktonic algae
Diatoms
- Chloroplast usually golden brown
- Unique silica containing cell wall
Diatoms
Made of silica
Diatoms exoskeleton
are found attached to a number of diverse animal
Epizoic
