Reward regulation in plant-frugivore networks requires only weak cues.

ABSTRACT: Theory assumes that fair trade among mutualists requires highly reliable communication. In plant-animal mutualisms the reliability of cues that indicate reward quality is often low. Therefore, it is controversial whether communication allows animal mutualists to regulate their reward intake. Here we show that even loose relationships between fruit brightness and nutritional rewards (r² = 0.11-0.35) allow birds to regulate their nutrient intake across distinct European plant-frugivore networks. Resident, over-wintering generalist frugivores that interact with diverse plant species select bright, lipid-rich fruits, whereas migratory birds select dark, sugar- and antioxidant-rich fruits. Both nutritional strategies are consistent with previous physiological experiments suggesting t

SUBMITTER: Albrecht J 

PROVIDER: S-EPMC6240120 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature