[NatureNS] Spider walking on water

Date: Sat, 25 Aug 2007 09:01:46 -0300
From: Eleanor Lindsay <az678@chebucto.ns.ca>
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David & Alison Webster wrote:
> Hi Eleanor,            Aug 24, 2007
>    I have not noticed any response to this question so will take a 
> stab at it, based on first principles.
>
>    The Spider would be taking advantage of surface tension so would 
> presumably have hairs or pads of hairs on the 'feet' that are not 
> readily wet by water. At each of the 8 points of contact, the water 
> surface would be dimpled. The dimples under Water Striders can be seen 
> as optical effects in shallow water (I think); 4 (6?) dark blotches 
> with light haloes as an enlarged shadow of the surface dimples ?
>
>    A typical used sewing needle has sufficient hand oils on the 
> surface to float briefly on calm water and the needle can be seen to 
> be floating in a depression.
> Yt, DW, Kentville
>
> Eleanor Lindsay wrote:
>
>> While swimming in our cove yesterday I came eye to eye in mid-cove 
>> with a spider (body approx 0.4cm diameter) walking purposively up and 
>> down the small wavelets towards the shore - a considerable distance. 
>> How on earth does it do that with thread-thin, stick-like legs?
>>
>> Eleanor Lindsay,
>> Seabright, St Margarets Bay
>>
>
>
>
>
Many thanks!
Eleanor

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