การกระจายเชิงพื้นที่และเวลาของหอยตะกาย Natica tigrina (Röding, 1798) บริเวณหาดเลนงอกใหม่แหลมผักเบี้ย: โครงการศึกษาวิจัยและพัฒนาสิ่งแวดล้อมแหลมผักเบี้ย อันเนื่อง มาจากพระราชดำริ จังหวัดเพชรบุรี

The findings study on spatial and temporal distribution of Tiger moon snail Natica tigrina (Röding, 1798) in the new mudflat area of Laem Phak Bia under the King’s Royally Initiated Laem Phak Bia Environmental Research and Development Project at Phetchaburi Province during May 2012 to April 2013. Field collection of the Tiger moon snail were carried out by line transect sampling method, using 10 line of a 100 meters transect (L1-L10). The result found that the habitat of Tiger moon snail was sandy loam in depth degree as surface sediment to 5 centimeter which had sandy 42%, silt 46%, clay 12% of that, clam wind and wave, high and low tidal at the lowest that was more than 12 hours, mud flat was as same level as sandy sediment that met the slope of that 20 degree. Total, 110 individuals of Tiger moon snail were obtained in this study. Our survey demonstrates that the highest number of the Tiger moon snail was 28 individuals in August 2012 and 57 individuals in the rainy season. At the distance of 500 (L500) meters off coast, the highest number of Tiger moon snail was 24 individuals. Among ten line transects, Tiger moon snail exhibited the highest abundance of 28 individuals in Line 8 (L8). The correlation showed positively related to the water quality, DO, TDS and orthophosphate (p<0.05). the correlation showed negatively related to the sediment quality magnesium (p<0.05) [ABSTRACT FROM AUTHOR]