Next Article in Journal
Further Screening of Entomopathogenic Fungi and Nematodes as Control Agents for Drosophila suzukii
Previous Article in Journal
Field Method for Testing Repellency of an Icaridin-Containing Skin Lotion against Vespid Wasps
Article Menu

Export Article

Open AccessArticle
Insects 2016, 7(2), 23; doi:10.3390/insects7020023

Contrasting Foraging Patterns: Testing Resource-Concentration and Dilution Effects with Pollinators and Seed Predators

Great Lakes Bioenergy Research Center and Department of Entomology, University of Wisconsin-Madison, Madison, WI 53706, USA
Department of Biology and Wildlife, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
Author to whom correspondence should be addressed.
Academic Editor: Brian T. Forschler
Received: 29 February 2016 / Revised: 20 May 2016 / Accepted: 28 May 2016 / Published: 3 June 2016
View Full-Text   |   Download PDF [839 KB, uploaded 3 June 2016]   |  


Resource concentration effects occur when high resource density patches attract and support more foragers than low density patches. In contrast, resource dilution effects can occur if high density patches support fewer consumers. In this study, we examined the foraging rates of pollinators and seed predators on two perennial plant species (Rudbeckia triloba and Verbena stricta) as functions of resource density. Specifically, we examined whether resource-dense patches (densities of flower and seeds on individual plants) resulted in greater visitation and seed removal rates, respectively. We also examined whether foraging rates were context-dependent by conducting the study in two sites that varied in resource densities. For pollinators, we found negative relationships between the density of flowers per plant and visitation rates, suggesting dilution effects. For seed predators, we found positive relationships consistent with concentration effects. Saturation effects and differences in foraging behaviors might explain the opposite relationships; most of the seed predators were ants (recruitment-based foragers), and pollinators were mostly solitary foragers. We also found that foraging rates were site-dependent, possibly due to site-level differences in resource abundance and consumer densities. These results suggest that these two plant species may benefit from producing as many flowers as possible, given high levels of pollination and low seed predation. View Full-Text
Keywords: optimal foraging; scale; prairie; pollination; seed predation; Apidae; Formicidae optimal foraging; scale; prairie; pollination; seed predation; Apidae; Formicidae

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Supplementary material

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Wenninger, A.; Kim, T.N.; Spiesman, B.J.; Gratton, C. Contrasting Foraging Patterns: Testing Resource-Concentration and Dilution Effects with Pollinators and Seed Predators. Insects 2016, 7, 23.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Insects EISSN 2075-4450 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top