It is a cosmopolitan species. In Europe it
was restricted to several archipelagos of the southern Atlantic including
Madeira and the Canary Islands. In the early eighties it was recorded in
south-eastern Spain and later in southern Portugal and the Balearic Islands.
Since then it has continued to expand its
range and has now been recorded from Sardinia, Sicily and Malta.
In America where it is widespread
throughout most of the continent, it is sometimes called the banded garden
spider or the garden spider. In Maltese
it has been named brimba rrigata.
The banded argiope
is large and impressive but it is not the only large spider one can find in the
Maltese islands. The most common is the lobed argiope, known in Maltese as brimba kbira tal-widien. This species is
found in valleys and in wooded areas including gardens.
Another species
known scientifically as Argiope
bruennichi is now extinct from the Maltese islands. One of the last individuals
of this species was found at Buskett in 1976.
The scientific
name argiope is Latin for “with bright face”.
The argiope family
consists of 78 species. Members of this family can be found on all continents
except Antarctica.
The argiopes are well known for their large
webs which are often decorated with a zigzag band of silk called stabilimentum.
This feature makes the web more visible which might reduce the number of
insects that are caught in it but studies have shown that the stabilimentum
also reduces the number of birds flying through the web. This gives spiders
which build more visible webs an advantage over others which do not, as they do
not have to rebuild a new web every time it is damaged or destroyed.
This article was published in the Times of Malta on 23 October 2013
No comments:
Post a Comment