淮河干流三种贝类形态参数与其湿重和干重之间的关系

Relationships between Shell Dimension Parameters of 3 Mollusks from Huaihe River and their Wet Mass,and Tissue Dry Mass

软体动物的生物量通常用带壳湿重来表示，但由于其外壳的重量显著，且主要成分为无机质的碳酸钙（94%-99%），故用带壳湿重来表示其生物量存在较大误差.有文献表明，用去壳干重和无灰干重来表示其生物量则显得更为妥当.本文选择淮河干流常见的3种贝类（河蚬、圆头楔蚌、楔形丽蚌），对其贝壳的3类形态参数和4种重量参数间的相互关系进行研究.结果表明：用壳长、壳宽和壳高等形态学参数去预测去壳干重与无灰干重这2个重量参数，均具有良好的预测效果（all R2〉0.92，P〈0.01）.在对去壳干重进行预测时，河蚬宜采用壳高（R2=0.9716），楔形丽蚌与圆头楔蚌则宜采用壳长（R2分别为0.9773和0.9858）；在对无灰干重进行预测时，则河蚬与圆头楔蚌均宜采用壳高（R2分别为0.9670和0.9922），而楔形丽蚌则仍采用壳长较为适宜（R2=0.9908），而无论是对于去壳干重还是无灰干重，壳宽的预测能力均相对较差.

The biomass of a mollusk is usually expressed by the wet mass with shell.However,because the weight of the shell is significant,and the main components of the shell is inorganic calcium carbonate（94%-99%）,it has a large error in using wet mass with shell to evaluate biomass.Many documentaries indicated that the tissue dry mass or ash free dry mass is relatively close to real biomass.The relationships between three morphological parameters of the shell and four weight parameters of three mollusks （Corbicula fluminea,Cuneopsis heudei,Lamprotula bazini）from Huaihe River were studied.The results show that the tissue dry mass and the ash free dry mass are well predicted by using the shell length,shell width and shell height （all R2〉0.92,P〈0.01）. For the sake of predicating the tissue dry mass,shell height should be used for Corbicula fluminea（R2=0.971 6）,and yet,shell length are advised to use for Cuneopsis heudei and Lamprotula bazini（R2=0.985 8,and 0.977 3）. In the case of predicating the ash free dry mass,shell height should be used for Corbicula fluminea and Lamprotula bazini（R2=0.967 0,and 0.992 2）,and shell length for Cuneopsis heude（R2=0.990 8）. The prediction ability of shell width is relatively weak to either tissue dry mass or ash free dry mass.