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Article

Floral Complexity Traits as Predictors of Plant-Bee Interactions in a Mediterranean Pollination Web

by 1 and 2,*
1
Evolutionary and Environmental Biology, University of Haifa, Haifa 3498838, Israel
2
Biology and the Environment, University of Haifa–Oranim, Tivon 36006, Israel
*
Author to whom correspondence should be addressed.
Plants 2020, 9(11), 1432; https://doi.org/10.3390/plants9111432
Received: 20 September 2020 / Revised: 21 October 2020 / Accepted: 21 October 2020 / Published: 24 October 2020
(This article belongs to the Special Issue Plant-Pollinator Interactions in Mediterranean-Type Ecosystems)
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. View Full-Text
Keywords: pollination network; flower morphology; complexity; phenology; machine learning pollination network; flower morphology; complexity; phenology; machine learning
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MDPI and ACS Style

Ornai, A.; Keasar, T. Floral Complexity Traits as Predictors of Plant-Bee Interactions in a Mediterranean Pollination Web. Plants 2020, 9, 1432. https://doi.org/10.3390/plants9111432

AMA Style

Ornai A, Keasar T. Floral Complexity Traits as Predictors of Plant-Bee Interactions in a Mediterranean Pollination Web. Plants. 2020; 9(11):1432. https://doi.org/10.3390/plants9111432

Chicago/Turabian Style

Ornai, Alon, and Tamar Keasar. 2020. "Floral Complexity Traits as Predictors of Plant-Bee Interactions in a Mediterranean Pollination Web" Plants 9, no. 11: 1432. https://doi.org/10.3390/plants9111432

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