Abstract:
Marine benthic organisms were studied for the biodiversity, density, biomass and
distribution along Bangsaen Beach, Chon Buri Province with 5 stations in February, April, June,
August, October and December 2017. A total of 36 families and 70 species were found and classified
into three main groups of bivalves, polychaetes and crustaceans. The dominant marine benthic
organisms were Glycera sp., Ceratonereis sp., Nereis sp., Scoloplos sp., Donax faba, Lucina sp.
and Meretrix meretrix. The average density and biomass of these organisms were 841 ± 541.90
ind/m2
and 95.05 ± 21.17 g/m2
, respectively. The abundance of these organisms changed throughout
the period of study, in which the highest average density was found in October (2,716 ± 1,532.54
ind/m2
), followed by August (874 ± 573.00 ind/m2
) and the lowest was in February (55 ± 41.32
ind/m2
). Diversity index, Evenness index and Species richness were in a range of 0.83 - 2.15,
0.80 0.93 and 1.12 3.05, respectively. Similarity index with cluster analysis of these organisms
at various stations and months could be separated into 7 main group at 55%. Considering with
relationship between abundance of marine benthic organisms and environmental factors, it was
found that density of these organism was related to organic contents, while the species of these
organisms had related to grain size particles.