Behavioral analysis of substrate texture preference in a leech, Helobdella austinensis.
Behavioral analysis of substrate texture preference in a leech, Helobdella austinensis.
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水蛭基质纹理偏好的行为分析，Helobdella austinensis。
DOI：
10.1007/s00359-019-01317-5
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Weisblat,DavidA
中科院分区：
文献类型：
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作者：
Kim,RachelC;Le,Dylan;Ma,Kenny;Heath-Heckman,ElizabethAC;Whitehorn,Nathan;KristanJr,WilliamB;Weisblat,DavidA
在野外，水蛭经常出现在光滑的表面上，如植被、光滑的岩石或人类的人工制品，如瓶子和罐头，因此表现出似乎是“基底纹理偏好”。在这里，我们在受控的情况下再现了这种行为，允许水蛭在一系列碳化硅衬底（砂纸）上自由走动。为了开始理解这种纹理偏好行为的神经机制，我们已经确定了水蛭行为的相关参数，在不同纹理的均匀基板上，以及在一个行为选择范例中，水蛭在每一步都面临着粗糙和光滑的基板纹理之间的选择。我们测试了两种非排他性的机制，可以产生基板纹理偏好：（1）差异扩散机制，其中水蛭更有可能在光滑表面上停止移动，而不是在粗糙表面上，（2）光滑选择机制，其中水蛭更有可能将其前吸盘（采取步骤的先决条件）附着在光滑表面上，而不是粗糙表面。我们建议，这两种机制有助于水蛭所表现出的纹理偏好。
Leeches in the wild are often found on smooth surfaces, such as vegetation, smooth rocks or human artifacts such as bottles and cans, thus exhibiting what appears to be a “substrate texture preference”. Here, we have reproduced this behavior under controlled circumstances, by allowing leeches to step about freely on a range of silicon carbide substrates (sandpaper). To begin to understand the neural mechanisms underlying this texture preference behavior, we have determined relevant parameters of leech behavior both on uniform substrates of varying textures, and in a behavior choice paradigm in which the leech is confronted with a choice between rougher and smoother substrate textures at each step. We tested two non-exclusive mechanisms which could produce substrate texture preference: (1) a Differential Diffusion mechanism, in which a leech is more likely to stop moving on a smooth surface than on a rough one, and (2) a Smoothness Selection mechanism, in which a leech is more likely to attach its front sucker (prerequisite for taking a step) to a smooth surface than to a rough one. We propose that both mechanisms contribute to the texture preference exhibited by leeches.