Flores-Garza Rafael, Flores-Rodriguez Pedro, García-Ibáñez Sergio, Valdés-González Arcadio
Unidad Académica de Ecología Marina, Universidad Autónoma de Guerrero, Acapulco, Guerrero, México.
Rev Biol Trop. 2007 Sep-Dec;55(3-4):867-78.
We quarterly sampled the molluskan community of Playa Ventura, Guerrero, Mexico. Sample size (20 m2 in lm2 units) was determined by the spatial distribution pattern of Plicopurpura pansa using a negative binomial distribution. The density of the P. pansa was 5.19 snails/m2 and the sex ratio near 1:1. The average size was 20.10 mm (most females were 10.5 to 27.0 mm; most males 12.0 to 27.0 mm). Density was high and small sized dominated. Mean size varied with time. General mean weight was 1.79 g. Females weight varied more, maybe because of the reproductive cycle. Recruits were collected in five samplings. Most copulation activity was in March of 2001. The associated community includes 26 species of Gastropoda, five ofBivalvia and one of Polyplacophora, Brachidontes semilaevis being dominant.
我们每季度对墨西哥格雷罗州文图拉海滩的软体动物群落进行采样。样本大小（以1平方米为单位，共20平方米）根据紫斑褶螺的空间分布模式，采用负二项分布来确定。紫斑褶螺的密度为每平方米5.19只，性别比例接近1:1。平均大小为20.10毫米（大多数雌性为10.5至27.0毫米；大多数雄性为12.0至27.0毫米）。密度较高，且小型个体占主导。平均大小随时间变化。总体平均重量为1.79克。雌性体重变化更大，可能是由于生殖周期。在五次采样中收集到了新个体。大多数交配活动发生在2001年3月。相关群落包括26种腹足纲动物、5种双壳纲动物和1种多板纲动物，其中半光滑肌蛤占主导地位。
