Mangrove Habitat Formation and Response to Holocene Sea-level Changes on Kosrae Island, Micronesia

Mangroves and Salt Marshes - 1996
Kiyoshi Fujimoto1, Toyohiko Miyagi2, Takao Kikuchi3, Toshio Kawana4
1Forest Environment Division, Forestry and Forest Products Research Institute, Tsukuba, Japan
2Department of Geography, Tohoku Gakuin University, Sendai, Japan
3Institute for Basin Ecosystem Studies, Gifu University, Gifu, Japan
4Faculty of Education, University of the Ryukyus, Okinawa, Japan

Tóm tắt

Mangrove habitats on Kosrae are divided into three types, i.e., an estuary or delta type, a backmarsh or lagoon type and a coral reef or tidal-flat type. Most of the mangrove forests of Kosrae have been developed during the last 2000 years by accumulating mangrove peat with the gradual sea-level rise of 1 to 2 mm/yr except the landward part of the estuary or delta type. On the other hand, during the period of rapid sea-level rise of about 10 mm/yr between 4100 and 3700 yr B.P., the mangrove forests ceased peat accumulation and retreated landward. Until 3500 yr B.P., mangrove forests were distributed only in narrow bands in the inlets. Therefore, the critical rate of mangrove peat accretion with sea-level rise is estimated at more than 2 mm/yr and less than 10 mm/yr. If the anticipated sea-level rise exceeds this critical rate, all of the mangrove forests of Kosrae will retreat landward and reduce rapidly.

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