Article open access publication

Functional diversity mediates macroecological variation in plant–hummingbird interaction networks

Global Ecology and Biogeography, Wiley, ISSN 1466-8238

Volume 27, 10, 2018

DOI:10.1111/geb.12776, Dimensions: pub.1106384753,

Affiliations

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  1. (1) Federal University of Uberlândia, grid.411284.a
  2. (2) University of Copenhagen, grid.5254.6, KU
  3. (3) State University of Campinas, grid.411087.b
  4. (4) University of Illinois at Urbana Champaign, grid.35403.31
  5. (5) Federal University of Paraná, grid.20736.30
  6. (6) Nees Institute for Biodiversity of Plants, Bonn, Germany
  7. (7) California State University, Channel Islands, grid.253554.0
  8. (8) Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, Mato Grosso do Sul, Brasil
  9. (9) Universidade Estadual do Rio Grande do Sul, grid.473004.4
  10. (10) Instituto de Ecología, grid.452507.1
  11. (11) State University of Feira de Santana, grid.412317.2
  12. (12) Plymouth University, grid.11201.33
  13. (13) University of Canterbury, grid.21006.35
  14. (14) Senckenberg Biodiversity and Climate Research Centre (BiK-F), Frankfurt am Main, Germany
  15. (15) National Institute of Amazonian Research, grid.419220.c
  16. (16) Autonomous University of Tlaxcala, grid.104887.2
  17. (17) Federal University of Pernambuco, grid.411227.3
  18. (18) Distance State University, grid.441234.4
  19. (19) Autonomous University of Hidalgo State, grid.412866.f
  20. (20) University of Valle, grid.8271.c
  21. (21) Universidade Federal de Sergipe, grid.411252.1
  22. (22) Federal University of Minas Gerais, grid.8430.f
  23. (23) Pedagogical and Technological University of Colombia, grid.442071.4
  24. (24) Federal University of Pelotas, grid.411221.5
  25. (25) Santa Clara University, grid.263156.5
  26. (26) Aarhus University, grid.7048.b, AU
  27. (27) University of Azuay, grid.442126.7
  28. (28) University of Northampton, grid.44870.3f
  29. (29) Imperial College London, grid.7445.2

Description

Species interaction networks are known to vary in structure over large spatial scales. We investigated the hypothesis that environmental factors affect interaction network structure by influencing the functional diversity of ecological communities. Notably, we expect more functionally diverse communities to form interaction networks with a higher degree of niche partitioning. Americas. Current. Hummingbirds and their nectar plants. We used a large dataset comprising 74 quantitative plant–hummingbird interaction networks distributed across the Americas, along with morphological trait data for 158 hummingbird species. First, we used a model selection approach to evaluate associations between the environment (climate, topography and insularity), species richness and hummingbird functional diversity as predictors of network structure (niche partitioning, i.e., complementary specialization and modularity). Second, we used structural equation models (SEMs) to ask whether environmental predictors and species richness affect network structure directly and/or indirectly through their influence on hummingbird functional diversity. For a subset of 28 networks, we additionally evaluated whether plant functional diversity was associated with hummingbird functional diversity and network structure. Precipitation, insularity and plant richness, together with hummingbird functional diversity (specifically, functional dispersion), were consistently strong predictors of niche partitioning in plant–hummingbird networks. Moreover, SEMs showed that environmental predictors and plant richness affected network structure both directly and indirectly through their effects on hummingbird functional diversity. Plant functional diversity, however, was unrelated to hummingbird functional diversity and network structure. We reveal the importance of hummingbird functional diversity for niche partitioning in plant–hummingbird interaction networks. The lack of support for similar effects for plant functional diversity potentially indicates that consumer functional diversity might be more important for structuring interaction networks than resource functional diversity. Changes in pollinator functional diversity are therefore likely to alter the structure of interaction networks and associated ecosystem functions.

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Times Cited: 9

Field Citation Ratio (FCR): 3.83

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