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 Post subject: Re: Golden Orb-Web Spider
Unread postPosted: Mon Mar 30, 2009 8:47 am 
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Distinguished Virtual Ranger
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Thats a beautiful photo Deebs! :clap:


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 Post subject: Re: Golden Orb-Web Spider
Unread postPosted: Wed Apr 29, 2009 1:06 pm 
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ndloti wrote:
Image
Image
Photo taken at Tshanga lookout in KNP .
I had not realised that they could attach their web to rock .

I would be interesting to know what method it physically employs to attach them , and is the web material from a different organ than the silk web material , or is the manufacturing process different ?

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KNP is sacred. I am opposed to the modernisation of Kruger and from the depths of my soul long for the Kruger of yesteryear! 1000+km on foot in KNP incl 56 wild trails.200+ nights in the wildernessndloti-indigenous name for serval.


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 Post subject: Re: Golden Orb-Web Spider
Unread postPosted: Wed Apr 29, 2009 10:36 pm 
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Nice photo Ndloti! :thumbs_up:

Spiders are fascinating creatures! And their silk is really interesting.

Inside the spiders abdomen (at the back) there are silk producing glands. Spiders may have up to eight such glands, which may produce several different types of silk. Each gland produces a specific type of silk. These glands open in to spinnerets just before the anus. These spinnerets are highly mobile tubes. They are paired and there may be two or three pairs, depending on the species. These spinnerets places the silk.

Some spiders have a further spinning organ called a cribelum, which enables them to produce and spin incredibly fine silk.

Silk is actually a form of protein which is produced in a liquid form. When it leaves the body, it goes through an acid bath, which transforms it in to a solid when entering the spinnerets.

As mentioned, many different types of silk can be produced for different uses. Some are incredibly strong and others delicate, some are sticky and others not. It depends on the intended use.

Your photo shows the anchor lines of a web that is stuck to a rock, with the appropriate form of strong silk. Clearly the ends is a form of sticky silk, fixing it to the rock. Any human would be awarded a Nobel prize for developing such an incredible technology! The same basic strategy can be used to fix the web against a tree trunk, branch or even a plane of glass.

Many different forms of webs are created by spiders, depending on their habitat and hunting strategy. Yet, incredibly, the majority of spiders do not use a web to catch their prey. Some indeed only use silk as a construction material, to build or line their nest. Yet, the presence of silk is a defining character of spiders.

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 Post subject: Re: Golden Orb-Web Spider
Unread postPosted: Thu Apr 30, 2009 8:19 am 
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Imberbe , thank you for your most interesting input .
I have on a few occasions accidentally walked into these webs , and have experience of how strong they are , and have seen a bird that was caught in one such web .
What interested me as well was exactly how rigid the webs anchoring point to the rock was when I carefully tested another apparently unoccupied web nearby .

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KNP is sacred. I am opposed to the modernisation of Kruger and from the depths of my soul long for the Kruger of yesteryear! 1000+km on foot in KNP incl 56 wild trails.200+ nights in the wildernessndloti-indigenous name for serval.


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 Post subject: Re: Golden Orb-Web Spider
Unread postPosted: Mon Oct 05, 2009 5:39 pm 
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Here is also a beautiful Banded-Legged Golden Orb-Web Spider

Image

See you in Kruger May 2010!
Karin

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 Post subject: Re: Golden Orb-Web Spider
Unread postPosted: Tue Dec 22, 2009 9:39 am 
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Golden orb web spider taken in KNP. On both the pictures you can clearly see the male behind the female (between her back legs).

ImageLarge

ImageLarge


Last edited by Elsa on Thu Jan 16, 2014 1:33 pm, edited 2 times in total.
pics resized.


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 Post subject: Re: Golden Orb-Web Spider
Unread postPosted: Tue Dec 22, 2009 2:14 pm 
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Male & female Lake Panic
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 Post subject: Spider, Golden Orb Web
Unread postPosted: Thu Apr 01, 2010 5:20 pm 
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This beautiful specimen is now resident in our garden.

Image

Image

Image


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 Post subject: Re: Spider, Golden Orb Web
Unread postPosted: Thu Apr 01, 2010 5:25 pm 
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michel367 wrote:
I see she has food enough. :thumbs_up: :thumbs_up:


I thought those were babies waiting to hatch, as then last babies ended up being males trying their luck. :wall:


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 Post subject: Re: Spider, Golden Orb Web
Unread postPosted: Fri Apr 02, 2010 9:35 am 
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Hi Sprocky

Most of the time you will find dew-drop spiders on these webs. Look around at the edges of the web, small spiders , silver elongated body (looks like a dew-drop, for camouflage), they scavenge on golden orb left-overs

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 Post subject: Re: Spider, Golden Orb Web
Unread postPosted: Mon Apr 05, 2010 9:16 am 
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Being one of the strongest natural fibres (& man made at that) in the world it is no surprise. I have seen various birds, Bats in Orweb Spiderwebs. :thumbs_up:


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 Post subject: Re: Spider ID needed
Unread postPosted: Mon Jul 19, 2010 2:39 am 
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Can anyone help with an ID of this spider, seen in Kgalagadi in March 2010.

Image

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 Post subject: Re: Spider ID needed
Unread postPosted: Thu Sep 02, 2010 9:41 am 
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Mgulube wrote:
Golden Orb??

Both you and Norman are correct. Many of the Argiope species are called Golden orb weavers. Sometimes they simply are called garden spiders.
Cheers
Jon


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 Post subject: orb
Unread postPosted: Wed Sep 08, 2010 9:15 am 
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Seen on the side of the road just north of Van Rhynsdorp on my recent trip to Namaqualand... golden orb spider.

Image


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 Post subject: Re: Spider, Golden Orb Web
Unread postPosted: Fri Sep 17, 2010 1:55 pm 
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The largest ever found webs come from a nephew of this spider, Caerostris darwini, a giant orb spider.
These spiders form their webs over rivers, spanning up to 25 :!: meters, and the webs have a surface of around 2.8 square meters.

Read up on it on this page and the links it contains.

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