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首页> 外文期刊>The Journal of Experimental Biology >Chela asymmetry in a durophagous crab: predominance of right-handedness and handedness reversal is linked to chela size and closing force
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Chela asymmetry in a durophagous crab: predominance of right-handedness and handedness reversal is linked to chela size and closing force

机译：食蟹蟹的螯不对称：右撇子和右撇子的优势与螯的大小和闭合力有关

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摘要

The swimming crab Portunus trituberculatus is a durophagous brachyuran. Right-handed crabs are predominant, but left-handed crabs are also found in nature. Left-handedness may arise from loss of the right crusher. We examined whether heterochely (morphology) was correlated with differences in closing force (physical property) and handedness (behaviour). The closing force was stronger in larger chela with greater apodeme height and handedness resided in the chela with stronger closing force. With loss of the right chela (autotomy), handedness transitioned from the right to left chela, and all crabs were left-handed thereafter. Reversed handedness was accompanied with a reduction of size and closing force in the regenerated right chela, and growth of the original left chela. After handedness reversal, dentition on the left dactylus of the newly-converted crusher was close to that of the original right crusher, but did not attain the same shape, even after 10 moults. Left-handed crabs were significantly worse than right-handed crabs at crushing hard-shelled prey. Chela formation was symmetrical in the zoea, and heterochely and right-handedness started in the megalopa, regardless of maternal handedness. Since the left chela is capable of being the crusher, heterochely may be caused by differences in morphogenetic velocity between the right and left chelae, under a signal discriminating right from left. Right-handedness is an attribute of P. trituberculatus, that would be inheritable across generations. It is probable that right-handedness was used in the earliest durophagous crabs, and this trend has been succeeded to extant species.
机译：游泳蟹Portunus trituberculatus是一种食蟹腕蛙。惯用右手的螃蟹占主导地位，但自然界也发现惯用惯用左手的螃蟹。左撇子可能是由于右破碎机的损失而引起的。我们检查了杂合性（形态）是否与闭合力（物理性质）和手感（行为）的差异相关。在具有更大的顶点高度的较大的螯中，闭合力较强，并且在闭合力较强的情况下，惯性位于该螯中。由于失去了右螯（自动切开），因此惯性从右螯过渡到了左螯，此后所有螃蟹都是惯用左手的。惯用反手伴随着再生的右螯的尺寸减小和闭合力减小，以及原始的左螯的生长。在反转惯性之后，新转换的破碎机的左手指齿列与原始右破碎机的齿列接近，但即使经过10次换齿也无法获得相同的形状。左撇子蟹在粉碎硬壳猎物方面比右撇子蟹差得多。螯的形成在动物区系中是对称的，并且杂种和右手性在半生不孕中开始，而不论母亲的手性如何。由于左螯能够成为破碎机，因此在区分左，右信号的情况下，左螯和右螯之间的形态发生速度差异可能会导致杂合。右撇子是P. trituberculatus的一个属性，可以世代相传。最早的硬食蟹可能使用了惯用右手的习惯，并且这种趋势已经在现存物种中获得成功。

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