Degradation of mangrove leaves immersed in the estuary of Nakama River, Okinawa.

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The fate of four kinds of mangrove leaves immersed in mid and lower estuaries of Nakama River, Iriomote Island, Okinawa was examined using a litter bag technique. The times required for loss of half the initial ash-free dry weight of immersed leaves were 13 ?? 16 days for Avicennia marina, 17 ?? 18 days for Rhizophora stylosa, 24 ?? 34 days for Sonneratia alba and 52 ?? 65 days for Bruguiera gyinnorrhiza. The rates of degradation of mangrove leaves immersed in the lower esturary appeared to be slightly faster than those immersed in the mid estuary. Non-cellulose carbohydrate contents of the decaying leaves were about 3 ?? 20% of the corresponding ash-free dry weight which tended to decrease towards the end of the experiment. On the contrary, the levels of the amino acid contents in the decaying leaves were rather complex and apparently increased during some periods of immersion except the case of A. marina.
社団法人日本水産学会の論文