1zIUK2Y

Nekatere diatomeje prosto lebdijo
v vodi. Trni in podobni kremenasti
izrastki preprečujejo, da ne
potonejo. Nekatere pa so razvile
drugačno strategijo: povezujejo se
v plavajoče kolonije in se družno
upirajo težnosti.
Največ kremenastih alg pa raste na
različnih površinah — prodnikih,
skalah in vodnih rastlinah. S primerno
obokano »škatlico« se alge
lepo prilegajo steblu; druge vrste
imajo svoje stebelce, s katerim so
pritrjene na površino. Vse zato, da
jih vodni tok ne odnese.
Some diatoms float freely in the
water. Spines and similar silica structures
prevent them from sinking.
Others have developed a different
strategy: they resist gravitation in
groups by forming floating colonies.
The majority of diatoms grow
attached to different surfaces: pebble–stones,
rocks and aquatic plants.
With suitably arched frustules some
species fit nicely to a stem; other species
form a stalk which is attached
to a surface. All this is used to resist
water currents.
10µm
Melosira varians
30