Potential Bias in Pan Trapping as a Function of Floral Abundance

By K. A. Baum, K. Wallen. 2011

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Interpreting insect declines: seven challenges and a way forward (2020, background): “…not change (for instance, in baited pitfall trapping for dung beetles during years of low dung availability, pheromone trapping for bark beetles when attractive volatile signals from host trees are low, or coloured pan trapping for bees during years of floral scarcity; e.g., Baum & Wallen, 2011).”
Monitoring insect pollinators and flower visitation: The effectiveness and feasibility of different survey methods (2019, background): “All rights reserved. floral resources on pan trap catches have also been mixed; with negative effects on abundance (Roulston, Smith, & Brewster, 2007) and species richness (Baum & Wallen, 2011), positive effects on abundance (e.g. Wood et al., 2015), and no effect (e.g. Rhoades et al., 2017).”
The relative performance of sampling methods for native bees: an empirical test and review of the literature (2020, background): “…flowers, whereas in residential areas, the wide array of unsuitable flowers may mean that bees are more likely to be attracted to colored pan traps, akin to suggestions that pan traps are more effective in resource-poor habitats (Potts et al. 2005, Roulston et al. 2007, Baum and Wallen 2011).”