克氏原螯虾掘洞行为研究

克氏原螯虾(Procam barus clarkii)掘洞时间多在夜间,可持续掘洞6~8 h,一夜挖掘深度成虾可达40 cm,幼虾可达25 cm。成虾的洞穴深度大部分在50~80 cm之间,少部分可以达到80~150 cm;幼虾洞穴的深度在10~25 cm之间;体长1.2 cm的稚虾已经具备掘洞的能力,洞穴深度在10~20 cm之间。洞穴分为简单洞穴和复杂洞穴两种:85%的洞穴是简单的,即只有一条穴道,位于水面上、下10 cm之间;15%较复杂,即有2条以上的穴道,位于水面以上20 cm处。洞穴的密度为2.8~5.6个/m2。每个洞穴中一般有1~2只虾,但冬季也常发现一个洞中有3~5只虾。克氏原螯虾在繁殖季节掘洞强度增大,在寒冷的冬季,掘洞强度微弱。

A Study on Burrowing Behavior of Procambarus clarkii

Procambarus clarkii burrowed more at night,and lasted for 6～8 h.The depth of burrows was 30～40 cm for the adult and 20～25 cm for the young over one night.The depth of burrows for most adults was 50～80 cm,some even reached 80～150 cm,the depth of burrows for the young was 10～25 cm.The juveniles which were 1.2 cm in length already had the capacity of burrowing,and the depth of burrows of them could reach 10～20 cm.The burrows could be divided into two types:the simple and the complex.About 85% burrows was the simple,which had only one tunnel,and 10 cm above or below the horizontal line,and 15% was the complex,which had more than two tunnels and 20 cm above the horizontal line.The density of the burrow was 2.8/m2～5.6/m2.1～2 individuals could be found in each burrow in whole year,and usually 3～5 individuals in winter.The burrowing intensity was the highest in breeding season.As the temperature decreased,it also decreased gradually.It became very weak in winter.