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首页> 外文期刊>Journal of Parasitology >The Interaction of Light and Gravity on the Transmission of Echinostoma caproni (Digenea: Echinostomatidae) Cercariae to the Second Intermediate Host, Biomphalaria glabrata (Gastropoda: Pulmonata)
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The Interaction of Light and Gravity on the Transmission of Echinostoma caproni (Digenea: Echinostomatidae) Cercariae to the Second Intermediate Host, Biomphalaria glabrata (Gastropoda: Pulmonata)

机译：光和重力的相互作用对cap棘棘Di虫（Digenea：Echinostomatidae）尾rc向第二中间宿主glamphata glabrata（天麻：Pulmonata）的传播的相互作用。

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The current experiments were designed to assess the interaction of light and gravity on the transmission of Echinostoma caproni cercariae to the second intermediate host, Biomphalaria glabrata. Transmission chambers were constructed of clear polyvinyl chloride pipe covered with a black sleeve to exclude light. Snails were constrained within the chamber to prevent movement, while permitting the cercariae to swim freely. A trial consisted of 2 infected B. glabrata shedding E. caproni cercariae placed at the center of the chamber with 5 uninfected B. glabrata placed 10 cm above and below the shedding snails as sentinels. Three experiments, consisting of 12 trials each, were conducted under the following lighting conditions, i.e., above and below the transmission chamber, and in complete darkness. In all 3 experiments, the proportion of metacercariae was significantly higher in snails at the top of the chamber. The results suggest that a negative geotaxis is the primary factor in the initial dispersal of E. caproni cercariae. Coupling negative geotaxis and positive phototaxis (light from above) resulted in a significantly higher proportion of metacercariae in sentinel snails at the top of the transmission chamber when corrected for cercarial density. There was no significant difference in the proportion of metacercariae in snails at the top or bottom of the transmission chamber with light at the bottom of the chamber or in complete darkness. Cercariae of E. caproni only respond to light in context, i.e., from above, and ignore the light stimulus when it comes from an unexpected location (bottom of the water column). Significantly greater numbers of cercariae were released from shedding snails when light was present, suggesting that emergence of cercariae from B. glabrata is dependent on light regardless of the position of the light source.
机译：当前的实验旨在评估光和重力对cap棘棘chin虫向第二个中间寄主glaphaata glabrata传播的相互作用。传输室由透明的聚氯乙烯管构成，该管上覆盖有黑色套管以排除光线。蜗牛被限制在室内，以防止运动，同时允许尾c自由游泳。一项试验包括将2株感染的光滑小球藻（B. glabrata）脱落的大肠杆菌（E. caproni cercariae）放在腔室的中央，将5株未感染的光滑小芽孢杆菌（B. glabrata）放置在脱落的蜗牛的上方和下方10 cm作为前哨。在以下照明条件下，即透射室的上方和下方，以及在完全黑暗的条件下，进行了三个实验，每个实验包括12个试验。在所有3个实验中，室顶部的蜗牛中cer尾proportion的比例明显更高。结果表明，负轴心是尾cap肠球菌初始扩散的主要因素。校正盲肠密度后，将负大地趋向和正向趋光耦合（来自上方的光）会导致透射室顶部前哨蜗牛中的cer尾proportion的比例明显更高。在透射室的顶部或底部的蜗牛中，在透射室的底部或完全黑暗的环境中，蜗牛的cer尾proportion的比例没有显着差异。 Caproni尾rc的尾rc仅在上下文中（即从上方）对光做出响应，而当其来自意外位置（水柱底部）时，则忽略了光刺激。当存在光时，从脱落的蜗牛中释放出大量尾aria，这表明从光滑芽孢杆菌中出来的尾c取决于光源，而与光源的位置无关。

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    《Journal of Parasitology》 |2010年第2期|p.325-328|共4页
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    Thomas R. Platt Hali Greenlee and Derek A. Zelmer*;

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    Department of Biology, Saint Mary's College, Notre Dame, Indiana 46556-5001. e-mail: tplatt@saintmarys.edu*Department of Biology and Geology, University of South Carolina Aiken, Aiken, South Carolina 29801.;

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