Digestive capacity predicts diet diversity in Neotropical frugivorous bats

Summary1. Predicting the diet diversity of animals is important to basic and applied ecology. Knowl-edge of diet diversity in animals helps us understand niche partitioning, functional diversityand ecosystem services such as pollination, pest control and seed dispersal.2. There is a negative relationship between the length of the digestive tract and diet diversityin animals; however, the role of digestive physiology in determining diet diversity has beenignored. This is especially important in vertebrates with powered flight because, unlike non-flying vertebrates, they have limitations that may constrain gut size.3. Here, we evaluate the relationship between digestive capacity and diet diversity in Carolli-nae and Stenodermatinae frugivorous bats. These bats disperse the seeds of plants that arekey to Neotropical forest regeneration.4. Our results show that digestive capacity is a good predictor of diet diversity in Carollinaeand Stenodermatinae frugivorous bats (R 2 =0 77).5. Surprisingly, the most phylogenetically closely related species were not similar in theirdigestive capacity or diet diversity. The lack of a phylogenetic signal for the traits evaluatedimplies differences in digestive physiology and diet in closely related species.6. Our results highlight the predictive usefulness of digestive physiology for understandingthe feeding ecology of animals.Key-words: food quality, intake response, niche, null models, PhyllostomidaeIntroduction