DEGRADATION OF FOREST VEGETATION UNDER ISLAND AREA VARIATIONS IN HOLOCENE (THE SOUTH OF LESSER KURIL
https://doi.org/10.7868/S2587556618010058
Abstract
Аbstract. Based on comprehensive study of a pit bog on theRudnyaBayseaside (ZelenyIsland) stages of landscape development were reconstructed for the south of Lesser Kuril Ridge when an extensive land bridge connecting South Kuril Is-lands withHokkaidoIslandhad existed there. Fragmentation of the land bridge was finally finished in the maximal phase of the Middle Holocene marine transgression. This led to isolation of island’s flora and fauna. Features of the relief of Lesser Kuril Ridge and increase in oceanic climate troubled migration of species from neighbor territories. Woody vegetation degraded rather quickly. Meadow-marsh landscapes have become predominant. Other factors which affected subsequent development of biotic components are climatic fluctuations, tectonic setting which increased the level of groundwater, tsunami waves, strengthening the role of the cold Oyashio Current and the fall of the volcanic ash of Masu volcano. Changes in the landscapes of the Lesser Kuril Islands are in many respects similar to those on theNemuroPeninsula(Eastern Hokkaido).
Keywords
South Kuril Islands,
peat bog,
spore-and-pollen and diatom analyses,
land bridge,
isolation of flora
Supporting agencies: Russian Foundation for Basic Research (project no. 12-05-00017).
About the Authors
Marina S. Lyashchevskaya
Pacific Institute of Geography, Far Eastern Branch, Russian Academy of Sciences
Russian Federation
Vladivostok
Russian Federation
Vladivostok
Tatyana A. Grebennikova
Pacific Institute of Geography, Far Eastern Branch, Russian Academy of Sciences
Russian Federation
Vladivostok
Russian Federation
Vladivostok
Nadezhda G. Razzhigaeva
Pacific Institute of Geography, Far Eastern Branch, Russian Academy of Sciences
Russian Federation
Vladivostok
Russian Federation
Vladivostok
Khikmatulla A. Arslanov
St. Petersburg State University
Russian Federation
St. Petersburg
Russian Federation
St. Petersburg
F. E. Maksimov
St. Petersburg State University
Russian Federation
St. Petersburg
Russian Federation
St. Petersburg
A. A. Starikova
St. Petersburg State University
Russian Federation
St. Petersburg
Russian Federation
St. Petersburg
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Graphical Abstract
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1. Area of field study and changes of position of land in Holocene | |
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- The fragmentation of the land bridge was finished in the maximum of the Middle Holocene transgression.
- Landform features and increased impact of maritime climate restricted colonization of the species from the neighboring areas.
- Arboreal vegetation degraded rather quickly, meadow-marsh landscapes became predominant.
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For citations:
Lyashchevskaya M.S., Grebennikova T.A., Razzhigaeva N.G., Arslanov Kh.A., Maksimov F.E., Starikova A.A. DEGRADATION OF FOREST VEGETATION UNDER ISLAND AREA VARIATIONS IN HOLOCENE (THE SOUTH OF LESSER KURIL. Izvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya. 2018;(1):52-62. (In Russ.) https://doi.org/10.7868/S2587556618010058
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