Showing posts with label orb web. Show all posts
Showing posts with label orb web. Show all posts

Monday, January 17, 2011

Aerobatic Arachnids

With all the rain we have had over the past few months insect numbers have increased dramatically.
A large swamp that connects to a lake system nearby has been supplying its fair share of mosquitoes and sandflies.
Its no wonder that I have such appreciation of spiders.
This little orb weaver is one of many that has made its residence on my veranda.  

As a child I watched with endless fascination as they formed their webs with such precision and balance, even when gusts of wind would blow them on a tangent temporarily.

Hooks on the hindmost legs help place the web as it is drawn from the spinnerets.

One of the most rewarding aspects of nature is that, no matter how often you have seen something, a new insight can be gleaned. Often when you least expect it. 

 The photo below is a crop of the one above and shows something unusual.
There seems to be a second thread of silk merging with the first to form the strand.
Spiders often have two types of spinnerets.
One is for the web and is fine and strong, the other is for encasing prey and is multi- threaded.
A perfect example is the Saint Andrews Cross.
I was not aware that multiple spinnerets were used for web production, though a number of shots taken indicate two at least.
Some shots of active web spinning spinnerets may prove an enlightening continuation of a study found pleasurable for the past 40 years.

Tuesday, April 06, 2010

Adaptation of Design

Arachnids never cease to amaze me.
I photographed this orb spiders web the other day with a strange adaptation.


The center of the web is inline with the wire, thus giving the spider some cover from the prying eyes of predators.
In case you might feel this has a degree of chance involved, the web is fixed to the wire only at the center point, with the rest of the intersection floating freely so as to catch prey.
This design would offer both protection and stability of the web.
An example of evolution at work through design adaptation.