Floral complexity traits as predictors of plant-bee interactions in a mediterranean pollination web

Alon Ornai, Tamar Keasar

Research output: Contribution to journalArticlepeer-review


Despite intensive research, predicting pairwise species associations in pollination networks remains a challenge. The morphological fit between flowers and pollinators acts as a filter that allows only some species within the network to interact. Previous studies emphasized the depth of floral tubes as a key shape trait that explains the composition of their animal visitors. Yet, additional shape-related parameters, related to the handling difficulty of flowers, may be important as well. We analyzed a dataset of 2288 visits by six bee genera to 53 flowering species in a Mediterranean plant community. We characterized the plant species by five discrete shape parameters, which potentially affect their accessibility to insects: floral shape class, tube depth, symmetry, corolla segmentation and type of reproductive unit. We then trained a random forest machine-learning model to predict visitor identities, based on the shape traits. The model’s predictor variables also included the Julian date on which each bee visit was observed and the year of observation, as proxies for within-and between-season variation in flower and bee abundance. The model attained a classification accuracy of 0.86 (AUC = 0.96). Using only shape parameters as predictors reduced its classification accuracy to 0.76 (AUC = 0.86), while using only the date and year variables resulted in a prediction accuracy of 0.69 (AUC = 0.80). Among the shape-related variables considered, flower shape class was the most important predictor of visitor identity in a logistic regression model. Our study demonstrates the power of machine-learning algorithms for understanding pollination interactions in a species-rich plant community, based on multiple features of flower morphology.

Original languageEnglish
Article number1432
Pages (from-to)1-12
Number of pages12
Issue number11
StatePublished - 24 Oct 2020

Bibliographical note

Funding Information:
Funding: This research was funded by The Israel Ministry of Environmental Protection, grant number 125-6-3.

Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.


  • Complexity
  • Flower morphology
  • Machine learning
  • Phenology
  • Pollination network

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science


Dive into the research topics of 'Floral complexity traits as predictors of plant-bee interactions in a mediterranean pollination web'. Together they form a unique fingerprint.

Cite this