Burrowing responses of the short-neck clam Ruditapes philippinarum to sediment contaminants.
Burrowing responses of the short-neck clam Ruditapes philippinarum to sediment contaminants.
复制标题
菲律宾蛤仔对沉积物污染物的挖洞反应。
DOI：
10.1016/s0025-326x(01)00299-5
复制
发表时间：
2002
影响因子：
5.8
通讯作者：
R. Cheung
中科院分区：
文献类型：
--
作者：
P.K.S. Shin;A.W.M. Ng;R. Cheung
通过一系列的实验室测试，研究了一种常见的热带双壳贝类菲律宾蛤仔对镉(Cd)添加的沉积物、沉积物粒度的变化和香港近岸水域15个地点的天然沉积物的洞穴反应。结果表明，洞穴响应与添加Cd的沉积物中Cd浓度的增加呈负相关。研究还发现，镉的水平与文蛤的死亡率成正比。然而，文蛤在不同粒度组成的沉积物中挖洞所需的时间没有显著差异(p>；0.05)。对于从15个地点采集的沉积物样本，计算了50%的受试者在48h内在沉积物中挖洞所需的时间(ET50)。方差分析结果显示，不同沉积物样本之间存在显著差异(p<；0.05)。图基的多重比对测试揭示了两组沉积物：第一组包含3个从维多利亚港采集的沉积物样本，第二组包含12个从香港其他沿海地区采集的样本。第1类沉积物的ET50值大于2880min，而第2类沉积物的ET50值平均为173.9分钟。根据重金属含量(As、Cd、Cr、Cu、Ni、Pb、Zn)对沉积物样品进行团聚分类，也显示出两个相似的组，表明ET50值与沉积物样品的金属水平相关。从维多利亚港采集的第1组沉积物中Cd、Cr、Cu、Ni和Zn的浓度高于第2组。本研究表明，沉积物中的高金属含量往往会抑制文蛤的洞穴反应，并有可能将菲律宾沼虾的洞穴反应发展为亚致死性沉积物毒性试验。
The burrowing responses of a common tropical bivalve, the short-neck clam Ruditapes philippinarum, to cadmium (Cd)-spiked sediment, variations of sediment grain size and natural sediments collected from 15 locations in Hong Kong's inshore waters were investigated through a series of laboratory tests. Results showed that the burrowing response exhibited a negative relationship with an increase in Cd concentration in the spiked sediments. The level of Cd was also found to be directly proportional to the percent mortality of the clam. However, there was no significant difference (p>0.05) in the time elapsed for the clam to burrow into sediments with different grain size composition. The elapsed time for 50% of the test clams to burrow into the sediment (ET50) over a period of 48 h was calculated for the sediment samples collected from the 15 locations. Results of ANOVA showed significant difference (p<0.05) among the sediment samples. Tukey's multiple comparison test revealed two groups of sediments: group 1 containing 3 sediment samples collected from Victoria Harbour and group 2 containing 12 samples obtained from other coastal areas of Hong Kong. The ET50value for group 1 sediments was found to be greater than 2880 min whilst the ET50for group 2 sediments had a mean of 173.9 min. Agglomerative classification of the sediment samples, based on metal content (As, Cd, Cr, Cu, Ni, Pb, Zn), also showed two similar groups, suggesting that the ET50values were correlated with the metal level of the sediment samples. Group 1 sediments collected from Victoria Harbour had greater concentrations of Cd, Cr, Cu, Ni and Zn as compared to that in group 2. The present study demonstrated that high metal content in the sediment tends to inhibit the burrowing responses of the clam and that there is potential to develop the burrowing responses of R. philippinarum as a sublethal sediment toxicity test.