Zblkowska Elzbieta
Department of Invertebrate Zoology, Institute of General and Molecular Biology, Nicholas Copernicus University, 87-100 Toruń, Poland.
J Parasitol. 2003 Feb;89(1):76-9. doi: 10.1645/0022-3395(2003)089[0076:TEODLO]2.0.CO;2.
The objective of this work was to examine the calcium concentration in the shells of naturally infected individuals of Lymnaea stagnalis. Calcium concentration in the water of lakes and in snail shells was examined by the EDTA method. Calcium concentration in the shells of infected snails was found to be higher than that in the shells of uninfected ones only in the lake with the lowest calcium concentration in water. However, this difference is not evidence of hypercalcification of snail shells caused by trematode larvae but suggests that the limited calcium concentration in the environment can be a very good factor for studying snail shell calcification under natural conditions. Moreover, small adult snails from 2 lakes had more calcium in their shells than did large ones. Different reproductive rates of different-sized snails could be the cause of this phenomenon.
这项工作的目的是检测自然感染的椎实螺贝壳中的钙浓度。采用乙二胺四乙酸（EDTA）法检测湖泊水体和蜗牛贝壳中的钙浓度。仅在水体中钙浓度最低的湖泊中，发现受感染蜗牛贝壳中的钙浓度高于未受感染蜗牛贝壳中的钙浓度。然而，这种差异并非吸虫幼虫导致蜗牛贝壳过度钙化的证据，而是表明环境中有限的钙浓度可能是在自然条件下研究蜗牛贝壳钙化的一个很好的因素。此外，来自两个湖泊的小成年蜗牛贝壳中的钙含量比大成年蜗牛的更多。不同大小蜗牛的繁殖率差异可能是造成这种现象的原因。
