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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Toxic Effects of Naphthalene-Spiked Sediment to Freshwater Oligochaete Limnodrilus hoffmeisteri from Chao Phraya Estuary) ผู้เขียน: วฤชา กาญจนอักษร,  ดร.ศรัณย์ เพ็ชร์พิรุณ, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe lethal and sublethal effects of naphthalene-contaminated sediment to Limnodrilus hoffmeisteri were determined using a 96 h, static-toxicity test. It was found that naphthalene was highly toxic to worms with 72 and 96 h LC50 values of 85.11 and 60.26 ?g/g wet wt, respectively. The 96 h EC50 values for autotomy and sediment avoidance were 35.48 and 58.88 ?g/g wet wt, respectively. The 96 h LOEC reworking activity value was 25 ?g/g wet wt which was more than two times lower than the LC50. The results suggested the usefulness of L. hoffmeisteri as a test organism to determine the toxicity of sediment polluted with naphthalene. Changes of morphological features and in behavioral responses of the worm can be used as criteria for sublethal toxicity testing. |