Черные пятна

[macroevolution]

Не знает ли кто-нибудь природу вот таких странных черных пятен на беломорских камнях? Какие-то бактерии, скорее всего? Пятна строго приурочены к самой верхней, узкой полосе литорали (верхняя часть зоны балянусов и выше). Это точно не антропогенное, явно какая-то биология-геохимия.

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[toothedgoo.livejournal.com]

Литораль лишайникам не помеха

http://www.ehow.com/list_7646185_plants-upper-littoral-zone.html

Black Lichen
Black lichen grows over rocks located on the coasts, and it is primarily found in northwest Europe. It is distinguished by its black color, and it looks similar to oil. It often has a fractured exterior, and it is usually covered in tiny warts that are lighter in color.


http://www.theseashore.org.uk/theseashore/SpeciesPages/Tar%20lichen.jpg.html

The black tar lichen ingrains itself into the rock, covering the bare rock. It is very widely distributed in northern Europe and very common, found on just about all rocky shores but especially more exposed shores where it can cover huge areas. It marks the edge of the littoral fringe and is edible to grazing animals after softening by water. It is believed to be a terrestrial species capable of tolerating brief periods of saltwater cover.