Natural counting units were defined as one unit for each colony, filament, diatom frustule
(regardless if colonial or filamentous) or unicellular algae.
The ability of juvenile abalone to ingest algae depends on the size of the abalone in relation to the algal cell size, the attachment strength of the alga to the substratum, and the strength of the algal cell wall or the outer frustule
of diatoms (Kawamura et al.
In some abalone species, it has been suggested that the dietary value for the juveniles differs among benthic diatom species, which have different morphologies, sizes, frustule
strengths (Kawamura et al.
itself can be fantastically ornate, covered in patterned ridges and pores in geometric designs.
It has been shown that major reservoirs built on boreal rivers can hold 30% to 70% of their annual water discharge (Dynesius and Nilsson, 1994), which can significantly decrease dissolved Si concentrations in rivers by providing preconditions for enhanced diatom growth and sedimentation of diatom frustules
, and subsequent burial in sediments behind dams (Conley et al.
Planktonic diatoms contribute frustules
to the sediment in deep open-water areas, while periphytic diatoms are primarily associated with shallower littoral habitats closer to shores (Wolin & Duthie 1999).
The finding of unbroken diatom frustules
does not mean that the cell is intact, because digestive enzymes may penetrate the cell through the valve pores and digest its contents, which may or may not leak into the gut.
The diatomite in Leekovo mire and Torvala is an exception, consisting almost entirely of diatomic frustules
Because filter-feeding zooplankton are concerned only with the size of their food and graze phytoplankton almost indiscriminately, indigestible coccoliths and diatom frustules
are concentrated in their fecal pellets.
will utilize the diatom frustules
to remove organic contaminants, heavy metals and radionuclides from contaminated surface and ground water sources.