Abstract

MARRERO, Hugo Javier; POMPOZZI, Gabriel  and  TORRETTA, Juan Pablo. Presas y sitios de capturas utilizados por arañas cangrejo (Araneae: Thomisidae y Philodromidae) en un pastizal del centro de Argentina. Ecol. austral [online]. 2015, vol.25, n.1, pp.19-25. ISSN 1667-782X.

Preys and capture sites used by crab spiders (Araneae: Thomisidae and Philodromidae) in a grassland of central Argentina. Distribution of predators and flowers influence on the selection of forage site of flower visitors. Predators, as crab spiders, can determine the structure of communities of flower visitors and influence on plant pollination. The objectives of this study were: (a) to evaluate the use of flowers or inflorescences (hereinafter units floral attraction, UFA) by crab spiders as capture sites; (B) to identify traits that may affect the use of capture sites; and (c) to assess the relationship between the size of the spiders and their prey. We surveyed two plots of one hectare in center of Pampas region (Buenos Aires, Argentina) recording all entomophilous flowering plants and their floral visitors. In addition, we captured all crab spiders with and without preys, recording the UFA they used as capture site. We estimate and evaluate the relationship between the size of the spiders and their prey. Crab spiders used as capture sites the most abundant UFA and with higher richness of floral visitors, regardless of whether they were flowers or inflorescences. On the other hand, the size of the spider could be determining the size of the preys. We found a positive association between the two variables, although this result was variable depending on the taxonomic orders of preys. Those results suggest that crab spiders can have a relevant role as modelers of the structure of plant - pollinator interaction.

Keywords : Pollinator; Triple interaction; Floral visitor; Pampas region.

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