Galanthus and water if disturbed by floods. Some snowdrop species are threatened in their wild habitats, due to habitat destruction, illegal collecting and climate change. In most countries collecting bulbs from the wild is now illegal. Under CITES regulations, international trade in any quantity of "Galanthus", whether bulbs, live plants, or even dead ones, is illegal without a CITES permit. This applies to hybrids and named cultivars, as well as species. CITES lists all species but allows a limited trade in wild-collected bulbs of just three species ("G. nivalis", "G. elwesii", and "G. woronowii") from Turkey and Georgia (see Horticulture). A
Chlamydomonas nivalis such that it is covered by the carotenoid globules full of astaxanthin that will provide protection against UV radiation. The majority (91%) of astaxanthin derivatives are stored in its monoester form within dormant "C. nivalis" red cysts. Astaxanthin is the pigment that makes the cell appear deep red. Other pigments that can also be found in "C. nivalis" include violaxanthin and fadonirubin. Visible algal blooms could be a crucial determinant of surface albedo. It has been suggested that algal blooms partially composed of "C. nivalis" may contribute to lowering ice and snow albedo. The red coloured pigments produced by the