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Study on web-site attributes and predatory efficiency of Dark Tetragnathid Spider in Point Calimere Wildlife and Bird Sanctuary

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Jayakumar S., Paramanandham J., Duraimurugan V., Sankari A., Ramya A., Sathiskumar S., Durga A.
International Letters of Natural Sciences
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2017
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tom 62
Spiders represent one of the most abundant components of the predatory arthropods in terrestrial ecosystem. Their effectiveness at restricting pest populations, both alone and as part of natural enemy complex has well demonstrated in many countries. The web, web-site attributes and predatory efficiency of Dark Tetragnathid Spider Tetragnatha mandibulata were assessed in Point Calimere Wildlife and Bird Sanctuary between August 2015 and March 2016. In the present study, the spiders used limited number of plants species. The relationship between web architecture and web-site attributes was estimated using Pearson’s correlation. Number of spiders recorded in the web showed the positive correlation with web horizontal and vertical length of the capture areas (p<0.05). Similarly, the web circumference showed the positive interaction with plant height and canopy width (p<0.05), which clearly indicated the importance of vegetations across the webs of Dark Tetragnathid Spider. Further, the microhabitat selection and utilization could also be impacted by non-trophic factors like structural features of plants that provide architectural supports to spiders. A total of 4620 insect pests comprising seven orders were entangled by the webs of dark tetragnathid spiders. Number of spiders in the web were positively correlated with number of insect pests (p<0.05), which clearly explained that the Dark Tetragnathid spiders restricting pest populations and therefore they are considered as useful organism in biological control.
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Effect of distance from forest edge on the distribution and diversity of spider webs In adjacent maize field

80%
Oleszczuk M., Ulikowska M., Kujawa K.
Polish Journal of Ecology
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2010
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tom 58
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nr 4
The study was carried out on lowland agricultural lands in western Poland between July and August 2007. The influence of the proximity of forested areas on the occurrence of foliage-dwelling spiders was defined by measuring the abundance of spider webs on five transects situated at distances of 0, 20, 40, 60 and 80 metres from the forest edge. Generally, the greatest diversity and the highest total density were observed close to the forest edge, but an opposite relation was found for orb webs, built by spiders from the families Araneidae and Tetragnathidae, whose abundance was the lowest in close proximity to the forest. At a distance of 80 metres from the forest a slight increase in total abundance of webs was recorded, no doubt due to the presence of weeds, in which were recorded numerous occurrences of sheet and irregular webs. On all the transects studied, orb webs predominated on maize shoots, whereas only three-dimensional sheet and irregular webs occurred on weeds. Included in this discussion are some of the potential effects of the proximity of forest areas on foliage-dwelling spider populations in maize fields and on the possibilities for spiders limiting this crop’s pests.
3

Lasius niger (L.) ants invade the web of an agelenid spider

80%
Elzanowski A., Czechowski W.
Polish Journal of Ecology
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2015
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tom 63
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nr 4
Black garden ants Lasius niger (L.) were observed to invade a web of an agelenid funnel spider (Agelena labyrinthica Clerck or Allagelena gracilens C. L. Koch) and to take the entangled prey away, probably after driving the resident spider out of the web. The observation adds to a few examples of ants invading spider webs and suggests complex interactions between ants and funnel spiders which are known to feed on rather than being ousted by ants.
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