Pollinator effectiveness in the mixed-pollination system of a Neotropical Proteaceae, Oreocallis grandiflora

Authors

  • Santiago Cárdenas-Calle Universidad del Azuay
  • Juan D Cardenas
  • Boris O Landázuri
  • Gabriela Mogrovejo
  • Antonio M Crespo
  • Nils Breitbach
  • Matthias Schleuning
  • Boris A Tinoco

DOI:

https://doi.org/10.26786/1920-7603(2020)601

Abstract

In pollination systems with a diverse community of floral visitors, qualitative and quantitative variations in pollination effectiveness can lead to a system in which higher effectiveness results from the synergetic contribution of multiple pollinators. By employing a series of field and laboratory experiments in the south Andes of Ecuador, we compared the effectiveness of hummingbirds and nocturnal mammals visiting Oreocallis grandiflora, an Andean member of the Proteaceae. Pollinator effectiveness was measured with a quantitative component that assessed visitation rates to inflorescences and number of contacted stigmas per visit, and with a qualitative component that counted the number of deposited pollen grains in stigmas. Effectiveness estimates were complemented with controlled pollination experiments that contrasted fruit and viable seed set among flowers exposed to either diurnal or nocturnal pollination, self-pollinated flowers, and a control group with flowers exposed to naturally occurring pollination. Four species of hummingbirds and two species of nocturnal mammals visited the flowers of O. grandiflora. Hummingbirds outperformed nocturnal mammals in the quantitative components of pollination, while mammals were more effective than hummingbirds in the qualitative component. Pollination success was higher for the control group than for the other treatments, while hummingbirds and mammals performed similarly. Our findings suggest a case of functional complementarity in pollination: hummingbirds’ quantitative effectiveness complements nocturnal mammals’ qualitative effectiveness. Furthermore, our study demonstrates that pollination success in plants can be greater when flowers are visited by the whole diversity of pollinators.

 

Author Biographies

Santiago Cárdenas-Calle, Universidad del Azuay

Researcher at Laboratory of Functional Ecology, Escuela de Biología, Ecología y Gestión. 

Juan D Cardenas

 

Boris O Landázuri

 

Gabriela Mogrovejo

 

Antonio M Crespo

 

Nils Breitbach

 

Matthias Schleuning

 

Boris A Tinoco

 

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Published

2021-01-13

How to Cite

Cárdenas-Calle, S., Cardenas, J. D., Landázuri, B. O., Mogrovejo, G., Crespo, A. M., Breitbach, N., Schleuning, M., & Tinoco, B. A. (2021). Pollinator effectiveness in the mixed-pollination system of a Neotropical Proteaceae, Oreocallis grandiflora. Journal of Pollination Ecology, 26. https://doi.org/10.26786/1920-7603(2020)601

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Articles