期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 215, 期 22, 页码 3965-3972出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jeb.073809
关键词
tree frog; adhesion; friction; self-cleaning; Litoria caerulea
类别
资金
- German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) [SPP1420]
Tree frogs use adhesive toe pads for climbing on a variety of surfaces. They rely on wet adhesion, which is aided by the secretion of mucus. In nature, the pads will undoubtedly get contaminated regularly through usage, but appear to maintain their stickiness over time. Here, we show in two experiments that the toe pads of White's tree frogs (Litoria caerulea) quickly recover from contamination through a self-cleaning mechanism. We compared adhesive forces prior to and after contamination of (1) the whole animal on a rotatable platform and (2) individual toe pads in restrained frogs mimicking individual steps using a motorised stage. In both cases, the adhesive forces recovered after a few steps but this took significantly longer in single toe pad experiments from restrained frogs, showing that use of the pads increases recovery. We propose that both shear movements and a 'flushing' effect of the secreted mucus play an important role in shedding particles/contaminants.
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