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Vegetation change viewed from pollen analysis around Haven Lake in Adak Island, Central Aleutians, Alaska

To determine vegetation change in Adak Island (central Aleutians), we collected peaty sediments (ADK13083002 Core) from Haven Lake in the island. We confirmed six apparent tephra layers (Black, 1976), 40 Years (0.4 cal kBP), YBO (3.6 cal kBP), Sandwich (4.7 cal kBP), Intermediate (7.2 cal kBP) and Main (9.5 cal kBP) and Upper and Lower Gritty (ca. 10 kBP). Four major pollen assemblage zones (HL-1 to -4 in descending order) are recognized in the cored sediments. The HL-1 pollen zone is dominated by Ranunclaceae and Empetrum. The HL-2 pollen zone is dominated by Poaseae, Ranunclaceae, and Empetrum. The HL-3 pollen zone is dominated by Poaseae and Empetrum. The HL-4 pollen zone is dominated by Poaseae, Cyperaceae, Empetrum and Lycopodiaceae. The charcoal chips increased above Intermediate Tephra. It's contemplated that the Aleut people arrived at Adak Island and started settling down from ca. 9.5 cal kBP.

Coastal wetlands are very fragile environment against external environmental changes such as sea-level rise and anthropogenic impacts. On the other hand, coastal wetlands have a significant role as a place for carbon sequestration in the belowground as well as the aboveground. This session will discuss the geomorphologic, biologic and anthropogenic processes on the coastal wetlands in the various climate zones during the Holocene. For example, coastal wetlands in the tropics have evolved with the development of wetland forests such as mangrove forest, peat swamp forest and fresh water swamp forest. The most significant process for habitat formation and maintenance of the former two forests are peat production and decomposition, which are also significant processes on the coastal lowlands in the temperate and subarctic zones, though the mechanism of the processes might be different. Geomorphological processes such as sedimentation and erosion by fluvial and marine processes are also important for all of coastal wetlands. However, the environment of coastal wetlands has been destroyed by various human activities such as deforestation, agriculture land development, peat mining, and shrimp firming in and around mangrove forests in recent years. We would like to invite the wide discipline of research papers on not only the natural processes but also the anthropogenic processes in order to offer the scientific basis for creating sustainable management systems on the coastal wetlands in the future.

[JJ] Coastal wetlands: geomorphologic, biologic and anthropogenic processes

JpGU-AGU Joint Meeting 2017

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[HCG36-P04]Vegetation change viewed from pollen analysis around Haven Lake in Adak Island, Central Aleutians, Alaska

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