Oliveira C S de, Vasconcellos M C, Pinheiro J
Departamento de Ciências Fisiológicas, Instituto de Biologia, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil.
Braz J Biol. 2008 May;68(2):367-71. doi: 10.1590/s1519-69842008000200018.
The influence of population density on some aspects of the reproductive biology of the snail Bradybaena similaris was studied. Molluscs were maintained under 0.2 (isolated), 0.3, 0.6, 1.0, 1.3 and 1.7 snail/m(2) densities. The animals maintained under 0.3 and 0.6 snail/m(2) showed the lowest numbers of eggs laid/snail, being the highest value observed to the 1.7 snail/m(2). The hatching of the snails maintained under 0.3 snail/m(2) density, begun at the 21st day after laying, and the maximum time required to the hatching was 36 days was observed to the eggs came from snails maintained under the densities 0.6, 1.0, 1.3 snail/m(2), respectively. The highest percentage hatchability (55.56%) was observed to isolated snails. The galactogen content in the albumen gland did not seem to accompany the alterations occurred in the reproduction of B. similaris in response to the different population densities.
研究了种群密度对相似扁卷螺生殖生物学某些方面的影响。将软体动物分别饲养在每平方米0.2只（隔离状态）、0.3只、0.6只、1.0只、1.3只和1.7只蜗牛的密度条件下。饲养在每平方米0.3只和0.6只蜗牛密度条件下的动物产卵量/蜗牛最低，每平方米1.7只蜗牛时观察到的产卵量最高。饲养在每平方米0.3只蜗牛密度条件下的蜗牛，产卵后第21天开始孵化，而对于分别来自每平方米0.6只、1.0只、1.3只蜗牛密度条件下的蜗牛所产的卵，观察到孵化所需最长时间为36天。隔离饲养的蜗牛孵化率最高（55.56%）。蛋白腺中的糖原含量似乎并未伴随相似扁卷螺繁殖过程中因不同种群密度而发生的变化。
