Study

Tuning the instrument: sonic properties in the spider’s web

Mortimer, Beth; Soler, Alam; Siviour, Clive R.; Zaera, Ramón; Vollrath, Fritz

Journal of the Royal Society Interface, 2016

Peer-reviewedphysiological studylaboratory

What they did

Orb webs and isolated silk threads were excited mechanically and with lasers, and their vibration transmission was measured across frequencies while tension, thread type and web geometry were varied.

Studied in: Nephila edulis
Sample size: webs and silk threads under controlled mechanical excitation

What they found

Silk transmits vibration over a wide frequency band with properties that change sharply with tension, and a spider can alter transmission by adjusting how tightly it holds and tensions the threads.

What it means

The authors' reading, and ours. Where they differ, that difference is the point.

How the authors put it

The web is a tunable vibration-transmission device, and the spider can adjust its properties rather than simply reading whatever arrives.

How NatureHQ reads it

The reframing here is the point: a web is usually described as a trap, and it is at least as much a sense organ — an external structure that collects mechanical information and can be re-tuned by the animal using it. The spider is not sitting in the middle waiting. It is adjusting the instrument. Whether the spider tunes deliberately for a task, as opposed to tension changing as a by-product of posture, is not settled by this work.

Limitations

One orb-weaver; web architectures across spiders differ enormously.
Mechanical characterisation in the laboratory, not behavioural demonstration of tuning in use.
Whether spiders adjust tension purposefully or incidentally is untested here.