Abstract
It has been suggested that physical interactions between biological and environmental surfaces may constrain ecological niche spaces. However, the mechanistic understanding of niche formation is frequently limited by the lack of information on the function and variation of these interactions. Here, we hypothesised that two closely related species of orb-web spiders have evolved different adhesion performance of web attachment (i.e. piriform silk) facilitating the occupation of contrasting microhabitats: plants versus rocks. Contrary to our prediction, we found that piriform silk adhesion was equally affected by surface chemistry in both species, with maximal adhesion on surfaces with high surface polarity and an average adhesion loss of 70–75% on low polar surfaces. Spiders did not respond to adhesion losses by increasing the anchor size, despite the repeated failure to attach their web to low polar surfaces. In a natural setting, poor adhesion on low polar surfaces may be mitigated by behavioural means, like the preference to place anchors on corrugated surface features such as leaf edges, or the spinning of multiple anchorages and formation of a bundled anchor line. Thus, microhabitat choice for web-building spiders may be governed by structural properties rather than surface chemistry. These results suggest that the repeatedly demonstrated effects of surface chemistry on bio-adhesion may be ecologically less important than assumed and that the role of behaviour in the evolution of bio-adhesion performance has been underestimated.
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Acknowledgements
Thanks to Alan Henderson (Minibeasts Wildlife, Kuranda, QLD) for providing A. mascordi individuals and to André Walter (Aarhus University) for providing habitat photos and observational details of A. mascordi.
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This study was supported by a Macquarie Research Fellowship of Macquarie University and a Discovery Early Career Researcher Award of the Australian Research Council (DE190101338) to JOW.
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JOW and MEH conceived and designed the study. JOW performed the experiments and analysed the data. DL performed the profilometric measurements of substrate surfaces. JOW wrote the paper and all other authors equally contributed in revision.
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Communicated by: Matjaž Gregorič
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Wolff, J.O., Little, D. & Herberstein, M.E. Limits of piriform silk adhesion—similar effects of substrate surface polarity on silk anchor performance in two spider species with disparate microhabitat use. Sci Nat 107, 31 (2020). https://doi.org/10.1007/s00114-020-01687-w
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DOI: https://doi.org/10.1007/s00114-020-01687-w