Signature Spider Web
Argiope luzona
15.4563, 119.92
Field Notes
Description:
Argiope luzona (Walckenaer, 1841). I am trying to show, with these pictures, some of the very detailed work carried out by a young adult female Argiope luzona. Firstly, I should point out that this spider was between 5 and 6 mm. long (excluding legs). The small size is a sure indicator that this is a very young adult and it has probably, very recently, changed from making Discoid Stabilimenta (web decorations) to Cruciate Stabilimenta (normally only made by adult female spiders). Other indicators of the young age of this spider are the markings on its dorsum (which are still rather faint and will become much stronger in a few days) and the colouring of the legs - fairly light colours, at present, but will become much darker in a few weeks. The position did not allow a photo of the entire web (too much vegetation in the way), but the third photo does show the three main components of the web. The hub, where the spider is sitting, is in the centre of the "free area" and has the tightest (closest) rings of the spiral, giving the spider a platform on which to sit and wait for vibrations which will confirm the impact and struggles of prey. Then, there is the rest of the free area where the rings are spaced a little wider and finally, the capture area, which the photo shows as having the widest spacing between the spiral rings. Please see Notes below.
Habitat:
This A. luzona was spotted on its web in the rice mill backyard, this morning. Its web was moored on the stems of two Banana Plants (Musa x Paradisiaca L.) known, generally, as “Saging” in the Philippine National language and in our local dialect, “Batag”. Plant information from http://www.stuartxchange.org/Saging.html......(
Notes:
My third photo above seems to show that the spacing of the spiral threads is most narrow in the hub, a little wider in the rest of the free area and is at its widest in the capture area. However, in an earlier spotting (of a more mature adult female Argiope luzona) - https://www.projectnoah.org/spottings/994483288.... that was not was not the case. On that web, the part of the free area between the hub and the capture area, had the widest spacing. I will try to find out more about this apparent difference in spacing shown in these two spottings.
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