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Species composition, habitat structure and sedimentation in a Sonneratia caseolaris stand at the Lam River estuary, Vietnam

Kazuya Takahashi1,2,  Tran Thi Tuyen1, Nguyen Huu Hien1, Nguyen Thuy Thi Ha1

1Vinh University, 182, Duan street, Vinh city, Nghe An province, VIETNAM.
2Mie Technology Licensing Organization Co., Ltd., 1577, Kurimamachiya-cho, Tsu city, Mie prefecture, JAPAN

doi: 10.5455/faa.80112                                                 pp: 157 – 166


This study aims to provide some information for development of silvofishery systems with a mangrove (S. caseolaris stand) for shrimp-culture ponds at the Lam River estuary, Vietnam. To achieve this objective, species composition, habitat structure and sedimentation effect in the S. caseolaris stand distributing along the canal for shrimp culture were surveyed. The study reveals that the stand contains four species or more under the canopy; dominant understory species are Aegiceras corniculatum, Cyperus malaccensis and Acanthus spp. (A. ilicifolius and A. ebracteatus). A. corniculatum was observed expanding its distribution area toward the low tidal zone. As a result, the habitat for seedlings/saplings of this species becomes significantly lower in land height than that of Acanthus spp. (ANOVA; p < 0.05), but not different from that of S. caseolaris. Sedimentation rates of A. corniculatum and Acanthus sp. recorded were 13.2 2.9 g m-2 hr-1 and 13.0 4.4 g m-2 hr-1, respectively. S. caseolaris sparsely grows with less developing of pneumatophore, which effectively traps sediment, at the early stage of succession. Considering reinforcement of sedimentation effect, especially right after restoration of the mangrove in the silvofishery systems, A. corniculatum and Acanthus spp. with S. caseolaris are recommendable to be introduced to the systems.

Keywords: Aegiceras corniculatum, Acanthus. understory species, low tidal zone, shrimp-culture pond

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