Factors leading to differences in water availability and photosynthetic activity of High Arctic lichens

第6回極域科学シンポジウム[OB] 極域生物圏11月16日（月）　国立極地研究所１階交流アトリウ

Photosynthetic responses to water and light of five Arctic lichens and their photobionts

第3回極域科学シンポジウム/第34回極域生物シンポジウム 11月27日（火） 国立極地研究所 ３階ラウン

Effects of substrate difference on water condition and photosynthetic activity of Arctic lichens

第2回極域科学シンポジウム/第33回極域生物シンポジウム 11月18日（金） 統計数理研究所 3階リフレッシュフロ

ECOLOGICAL NOTES ON THE DIFFERENCES IN FLORA AND HABITAT OF LICHENS BETWEEN THE SYOWA STATION AREA IN CONTINENTAL ANTARCTIC AND KING GEORGE ISLAND IN MARITIME ANTARCTIC (Twelfth Symposium on Polar Biology)

Some examples of the differences in flora and habitat of lichens between the Syowa Station area in the continental Antarctic, and a part of King George and Nelson Island (King George Island region) in the maritime Antarctic, are presented by the author who carried out the field surveys in both regions. A total of 57 species of lichens are enumerated for the Syowa Station area and 198 species for the King George Island region. Although most genera known to occur in the Syowa Station area are also found in the King George Island region, only 20 percent of the species occurring in the Syowa Station area are growing in the latter. Most lichens known from the Syowa Station area are microlichens, whereas in the King George Island region many macrolichens are growing beside microlichens. It might be most plausible to conclude that one of the factors influencing the rich lichen flora including many macrolichens in the maritime Antarctic is the mild weather conditions of the region. The major factor controlling lichens in the Antarctic appears to be not temperature but water supply. In the Syowa Station area extensive sites lack lichen cover, even where the ground is normally snow free in summer. On the other hand, both macro- and microlichens are growing everywhere in the King George Island region. Higher precipitation in the King George Island region dilutes the salinity brought by the wind-blown sea spray, while not so in the Syowa Station area because of the low precipitation in summer, though accurate meteorological data supporting this assumption are very few

FLORISTIC NOTES ON LICHENS IN THE FILDES PENINSULA OF KING GEORGE ISLAND AND HARMONY COVE OF NELSON ISLAND, SOUTH SHETLAND ISLANDS, THE ANTARCTIC (14th Symposium on Polar Biology)

Floristic interests of lichens in the Fildes Peninsula of King George Island and Harmony Cove of Nelson Island belonging to the maritime Antarctic zone are mentioned. A total number of species occurring in the present region is discussed comparing it with the estimations of previous authors. Preliminary contributions to a phytogeography are mentioned. The lichens enumerated from the present region are classified into three major groups by their distribution patterns; 1) species known only from the maritime Antarctic, 2) species often reported from the maritime Antarctic, but hardly known from the continental Antarctic, and 3) species known to occur in the maritime and continental Antarctic. Concerning the distributions of four species not belonging to these major groups are briefly discussed

Factors influencing the existence of lichens in the ice-free areas near Syowa Station, East Antarctica

The factors influencing the existence of lichens in the ice-free areas along the Soya Coast and Prince Olav Coast, Antarctica are discussed. Water supply is one of major factors. Lichens grow luxuriantly in the sites where an adequate moisture is maintained due to snow and ice brought by the "katabatic wind" through the surface of ice cap, while lichens are absent or poorly developed in the dry sites which are buffeted by cyclonic wind through the surface of sea ice. Moisture for lichens appears to be supplied not only from snow-melt water but also from air. The wind-blown sea spray is one of the unfavorable factors for lichens in the areas investigated. Well-developed lichens can be seen around the rookeries or nests of sea birds. However, they are absent around the rookeries which are influenced bv the wind-blown sea spray

Lecideoid lichens of Prince Olav Coast and Soya Coast, Enderby Land, East Antarctica

Five species of lecideoid lichens belonging to three genera are reported as new to the flora of the Prince Olav Coast and the Soya Coast, Enderby Land, East Antarctica; they are Carbonea capsulata (DODGE & BAKER) HALE, Lecidea andersonii R. FILSON, Lecidea cancriformis DODGE & BAKER, Lecidea soyaensis M. INOUE and Lecidella siplei (DODGE & BAKER) M. INOUE. All are endemic to Antarctica. An examination was made of the collections from the region, which were collected mainly by the author under the project of the 27th Japanese Antarctic Research Expedition (JARE-27,during January 1986 and February 1987). The type and authentic specimens of possibly related species have been restudied. Lecidea soyaensis M. INOUE is new to science and Lecidella siplei (DODGE & BAKER) M. INOUE is proposed as a new combination. Taxonomic and chemical data as well as a key to the known taxa are provided