自然光照条件下福寿螺分布规律

Distribution of Pomacea canaliculata under natural light

研究福寿螺(Pomacea canaliculata)在自然光照条件下的分布规律,连续多日调查自然光照下水族箱中福寿螺在不同时间(9:30、12:00、14:30)的分布情况,对同一水深同一时间光照区和遮阴区的福寿螺分布密度进行差异性分析,通过重复测量方差分析确定光照、水深、时间、螺个体大小对福寿螺分布的影响。结果表明,光照和单日内时间对福寿螺的分布均存在明显影响,12:00水深5、10、20 cm遮阴区福寿螺密度均明显高于光照区;遮阴区与光照区螺密度之差在12:00最高,9:30最低,意味着越接近中午,福寿螺越倾向于在遮阴处活动;而水深和螺个体大小(成螺、幼螺)对福寿螺的分布影响不明显。因此,自然光照会影响福寿螺在水中的分布,福寿螺在光照区和遮阴区的分布密度呈现出规律性变化,其会爬至遮阴处躲避阳光直射,这可能与水温、光照强度等因素有关。

The distribution law of Pomacea canaliculata under natural light was studied.The distribution of Pomacea canaliculata under natural light at different time(9:30,12:00,14:30)in aquarium was investigated for days,the difference in density of Pomacea cana⁃liculata between inside and outside the shadow in the same water depth and time was analyzed,repeated measures ANOVA was used to determine the effects of sunlight,water depth,time and snail individual size on distribution of Pomacea canaliculata.The results showed that sunlight and time in a day had obvious effect on distribution of the snails.At the water depth of 5,10,20 cm,the density of Pomacea canaliculata in the shaded area was obviously higher than that in the sunshiny region at 12:00.The different between shade and lighting area in snail density was highest at 12:00 and lowest at 9:30,that meant more snails tended to stay in the shading area when the time was closer to noon.But the distribution of Pomacea canaliculata had not been significantly impacted by water depth and snail individual size.Thus,the natural light could affect the distribution of Pomacea canaliculata in water,the distribution density of the snails in sunshiny region and shaded area exhibited regular change,the snail can crawl to shade away to avoid direct sunlight,this might be related to water temperature,illumination intensity,and so on.