大竹蛏稚贝对底质粒径的选择性试验

Selective Study on Sediment Particle Size of Solen Grandis Dunker

为了解大竹蛏稚贝对底质粒径的选择性,根据辽宁省自然海区底质实际情况,设计了5种不同粒径的底质,分别为:极粗沙(1.250~2.000 mm)、粗沙(0.625~1.250 mm)、中沙(0.313~0.625 mm)、细沙(0.156~0.313 mm)、极细沙(0.078~0.156 mm)。观察、记录大竹蛏稚贝在不同粒径底质的潜沙行为、潜沙准备时间、潜沙时间。结果表明,壳长6.0~8.5 mm的大竹蛏稚贝在粒径为0.078~1.250 mm的底质中潜沙速度较快,整体潜沙效果较好,对该粒径范围底质有较强的选择性。

On the basis of the sediment condition in Liaoning natural sea area,we disigned five different particle sizes of sediment to study the selectivity of the sediment particle size of Solen grandis Dunke.The experimental grounps were:a coarse sand(1.250-2.000 mm),coarse sand(0.625-1.250 mm),medium sand(0.313-0.625 mm),silver sand(0.156-0.313 mm),very fine sand(0.078-0.156 mm).We came to the following conclusion:Solen grandis Dunker drill into the sand speed is faster and the result is higher when the sediment particle size is from 0.078 mm to 1.250 mm.It has strong selectivity for the substrate in this particle size range.