The Survey of taxa richness and density of macrobenthic community in Ao Phrao beach, Koh Samet, Rayong Province after crude oil spill occurred

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1 ก ก ก The Survey of taxa richness and density of macrobenthic community in Ao Phrao beach, Koh Samet, Rayong Province after crude oil spill occurred, 1* ก ก 1 Napakhwan Whanpetch, 1* and Kittipong Puksawas 1 ก ก ก ก ก ก (1 3 6 ก ก ก ) 13 ก 3 ก ก 1 ก 3 ก ก ก 6 กก ก กก ก ก ก ก ก ก ก ABSTRACT Study on taxa richness and density of macrobenthic community after crude oil spilled occurred at Ao Phrao beach, Koh Samet, Rayong Province was carried out. The samples of sand and macrobenthos were collected around Ao Phrao beach in August 2013, October 2013 and January 2014 (1 month, 3 months and 6 months after oil spill leaked). Thirteen taxa of three phylum of macrobenthic animals were found. The result showed that density, taxa richness and taxa composition of macrobenthic animals decreased after 1 month of oil spill leaked and slightly increased after 3 months. Macrobenthos decreased again after 6 months. This study demonstrated that macrobenthic community might be in the process of recovery process. Macrobenthic community needs to continue the research to confirm this result. Key Words: macrobenthos, oil spill impact, sandy beach, Ao Phrao, Thailand * Corresponding author; address: tearna@gmail.com 1 ก. ก ก Department of Marine Science, Faculty of Fisheries, Kasetsart University, Ngam Wong Wan Road, Chatuchak, Bangkok 10900

2 ก ก 50,000 ก ก ก 20 ก 27 ก ก 2556 ก ก ก ก ก ก ก ก ก ก ก ก (, 2557) ก ก ก ก ก ก ก (, 2528;, 2553; Nybakken, 2001) ก ก (Brook, 1977; Tenore, 1977; Klumpp et al., 1989) (Thorson, 1957) ก ก ก ก ก ก (Wass, 1967; Reish, 1972; Rosenberg 1977) ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก 3 ก 100

3 1) (AP1) ก ก ก ก ก ก ก ก ก 6 ก ก (medium sand) ก ) ก (AP2) ก ก (medium sand) ก ก 6 3) (AP3) ก (coarse sand) ก ก 6 (Figure 1) 2556 ก ( 2556), 3 ( 2556) 6 ( ก 2557) กก ก ก Figure 1 Sampling stations in Ao Phrao beach, Koh Samet, Rayong Province (AP1; Southern part of Ao Phrao, AP2; Middle part of Ao Phrao, AP3; Northern part of Ao Phrao) ก ก ก ก 3 corerr ก 15 ก ก 20 ก ก ก ก ก ก 10 % ก ก ก ก ก ก

4 ก ก (Stereomicroscope) ก ก 1 ก ก กก ก ก 3 3 ก ก 2556 (1 ก ก ก ) 2556 (3 ก ก ) ก 2557 (6 ก ก ) 13 ก 3 ก Phylum Annelida, Phylum Mollusca Phylum Arthropoda (Table 1) Scolelepis (Scolelepis) sp. Donax cuneatus ก (Taxa richness) ก ก ก ก ก ก ก 3 6 ก ก ก ก (Taxa richness) ก ก ก ก ก ก AP1 ก ก ก 3 ก 6 กก ก ก ก 1 AP2 ก 3 6 AP3 ก ก AP1 ก 3 ก ก ก 6 (Figure 2) AP1 ก (Taxa richness) ก 3 ก ก ก 7±3 AP3 3 AP2 6 ก ก 6±1 4±1 AP3 3 ก 565 AP2 6 AP ก AP1 1 ก ก ก ก

5 ก ก 6 ก ก Table 1 Macrobenthic density (inds/m 2 ) in Ao Phrao beach, Koh Samet, Rayong Province (AP1; Southern part of Ao Phrao, AP2; Middle part of Ao Phrao, AP3; Northern part of Ao Phrao) Marine organisms * (-) = not found, Aug 2013 = 1 month after oil spill leaked, Oct 2013 = 3 months after oil spill leaked, Jan 2014 = 6 months after oil spill leaked Aug 2013 Oct 2013 Jan 2014 Aug 2013 Oct 2013 Jan 2014 Aug 2013 Oct 2013 Jan 2014 Phylum Annelida Armandia lanceolata ±33 - Prionospio (Minuspio) sp. - 38± Scolelepis (Scolelepis ) sp ±204 56±33-226±130 94±33-339±196 - Spiophanes bombyx ± Capaitellidae Genus indet. 1-19± Pisionidae Genus indet ± Phylum Mollusca Donax cuneatus - 19± ±75 38±19 75±65 56±56 Donax faba ±33 19± Donax incarnatus ± Phylum Arthropoda AP1 AP2 AP3 Dotilla wichmannii - 19± Amphipoda - 19± Decapoda sp ±19 - Isopoda - 19± กก ก ก ก ก ก 3 ก 2556 ( 1 ก ก ก ) 2556 ( 3 ก ก ) ก 2557 ( 6 ก ก ) ก ก 3 ( 100 ) ก ก ก ก 3 ก ก ( ) ก ก ก ก ก ก ( ) ก ก ก ก ก ก ก

6 ก ก ก ก (Whanpetch et al., 2010) ก ก ก ก ก ก ก ก 1 ก กก ก ก ก ก ก ก 1-2 ( ) ก ก ก (2557) ก ก ก ก ก ก 2.51 ก ก ก 2.53 ก ก ก ก ก ก ก ก ก 2 Taxa richness Density (inds/m²) AP1 AP2 AP3 station Figure 2 Temperal variation in density (above), taxa richness (below) of macrobenthic animals collected at Ao Phrao beach, Koh Samet, Rayong Province (AP1; Southern part of Ao Phrao, AP2; Middle part of Ao Phrao, AP3; Northern part of Ao Phrao) in 1 month, 3 months and 6 months after oil spill leaked

7 กก ก ก ก ก 6 ก ก ก ก ก ก ก ก ก ( ) ก ก ก ก ก ก ก ก 1 ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ( 2556), 3 ( 2556) 6 ( ก 2557) กก ก ก ก ก ก ก ก ก 1 ก 3 ก ก ก 6 กก ก กก 6 ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก กก, ก ก ก

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