Estimated mean number of prey web day
Argiope bruennichi Argiope bruennichi Argiope bruennichi Argiope bruennichi Argiope savignyi Argiope argentata Argiope argentata
5 4.9 4.3 5.9-6.5 3.0 4.2 1.6**
ADL ADL OPD OPD OPD OPD ADL
This paper Ludy (2007) Pasquet (1984) Malt (1996a) Nentwig (1985) Nentwig (1985) Robinson & Robinson (1970)
Overall mean ± SE
4.2 ± 0.6
ADL = web examinations all day long
OPD = web examination once per day ** Tiny insects not included in prey census
Tab. 4. Estimates of prey capture rates for adult female Argiope spiders (literature data).
(Higgins 1987). Hoffmaster (1985) compared orb-weaver guilds (including Argiope spiders as prominent guild members) of Texas and Panama grass- lands. She found that the orb-weavers in the two areas exhibited very similar foraging patterns, supporting the idea that resources were equally utilized in each area.
The availability of various types of potential prey may differ from year to year (Horton & Wise 1983) and from location to location (Brown 1981; Nyf- feler 1982; Higgins 1987; Szymkowiak & al. 2005). But orb-weaving spiders apparently can adjust food consumption to their requirements to a certain degree by altering the size of their web and the frequency of rebuilding it, and/or moving to more profitable web sites (see Witt & al. 1968; Sherman 1994; McNett & Rypstra 1997; Nakata & Ushimaru 1999; Chmiel & al. 2000; Miyashita 2005).
I extend my gratitude to an anonymous reviewer for his comments on an earl- ier draft of this paper. Furthermore I wish to thank Dr. Steffen Malt, University of Jena, for stimulating discussions on his dissertation project. This research was in part funded by a grant of the Swiss National Science Foundation.
Prey catch of Argiope bruennichi