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As a result prey and predator densities were correlated (P-Np Pearson r?=??0��69, P-Nsr?=??0��56) and parameters in the Hassell�CVarley models may not have been estimated adequately. Overall, models based on a Holling type II response had more support (total wi?=?0��65) than those based on the Hassell�CVarley function (total wi?=?0��34), while Holling type I response models received no support (total wi??0��99 and total wi?=?0��98, respectively). In contrast to the results from the allometric group, http://www.selleckchem.com/products/AZD6244.html functional response models including an effect of I were supported (total wi?=?0��79). Density-dependent models not including individual traits (M and S) received no support (��?>?34��34, wi? http://www.selleck.cn/products/azd4547.html The top two allometric functions including S and M (Tables?2 and 3) were identified as the only supported models when combining both groups of functions. The best functional response model had ��?=?4��5 (Table?2), suggesting limited support for a density effect on natural feeding rates. We captured and identified invertebrates from 17 different orders. The most abundant group was Araneae (Fig.?S1, Supporting Information), while Ephemeroptera, Neuroptera and Odonata were rare (found in less than six enclosures and representing http://www.selleckchem.com/products/MK-1775.html F5,15?=?4��84, p?=?0��008, adjusted R2?=?0��49). There was also an effect of lizard density on spider biomass Ns (��?=??1��69, SE?=?1��393; Fig.?3b) with no effect of creek proximity (overall regression F5,15?=?4��49, p?=?0��011, adjusted R2?=?0��47). Despite these differences for particular invertebrate groups, we did not detect differences in invertebrate community structure with lizard density, although there was a weak but significant effect of creek proximity (density: R?=?0��05, p?=?0��38; creek proximity: R?=?0��14, p?=?0��05). Results did not change if the rare orders: Ephemeroptera, Neuroptera and Odonata, were excluded. Both lizard body mass and sex had important effects on individual feeding rates. Larger predators consume more prey than smaller individuals as previously reported for Z. vivipara (Avery 1971; Pilorge 1982) and many other species (Tripet & Perrin 1994; Aljetlawi, Sparrevik & Leonardsson 2004; Vucic-Pestic et?al.