Scientific publications

Sonina A.V., Fadeeva M.A.
The dynamics of rock lichen associations depending on substrate humidity
// Biodiversity of Fennoscandia (diversity, human impact, nature conservation). Petrozavodsk: Karelian Research Centre of RAS, 1997.
The problem of the dynamics lichen associations in changing environmental conditions is not studied well enough.

The effect of the distance from a shore on the epilitic lichen associations of coastal rocks of the cape Kochkovnavolok (Eastern shore of the Onega lake) was investigated. The coastal rocks are formed by plagio-microclin granites.

The method of transects was used. 298 test plots were described. The variety of species, total covering and covering of each species depending on a degree of rock surface humidity and on structure of substrate surface were recorded.

Investigation have shown that the distance from a shore effects the structure of lichen cover. The further get from a lake shore the variety of species and total covering increase. Among the lichen vegetation groups of species wich prefer habitats with certain surface humidity level were distinguished. Some species of lichens such as Aspicilia aquatica, Candelariella vitellina, Lobothallia melanaspis, Phaeophyscia sciastra do not occur in lichen associations in habitats with low humidity of rock surface. On the contrary in these associations such species are present as Rnizocarpon geographicum, Rinodina demissa, Diploschistes bryophilus, Umbilicaria deusta, which do not occur in habitats with high humidity of rock surface. Such lichen species as Rhizocarpon badioatrum, Rinodina milvina, Staurothele clopima, Acarospora sp. can be found on all investigated area and only their abundant change.

It can be concluded that changes in rock surface humidity due to the distance from a shore lead to the reorganization of the lichen associations.
Last modified: May 31, 2012