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Title: The influence of biogeographical and evolutionary histories on morphological trait-matching and resource specialization in mutualistic hummingbird–plant networks
Authors: Dalsgaard, Bo
Maruyama, Pietro Kiyoshi
Sonne, Jesper
Hansen, Katrine
Zanata, Thais Bastos
Abrahamczyk, Stefan
Alarcón, Ruben
De Araujo, Andréa Cardoso
Araújo, Francielle Paulina
Buzato, Silvana
Chávez-González, Edgar
Coelho, Aline Góes
Díaz-Valenzuela, Román
Dufke, Maria F.
Enríquez Rocha, Paula L.
Martins Dias Filho, Manoel
Fischer, Erich
Kohler, Glauco U.
Lara, Carlos
Las-Casas, Flor Maria Guedes
Rosero-Lasprilla, Liliana
Machado, Adriana Oliveira
Machado, Caio Graco
Maglianesi, María Alejandra
Malucelli, Tiago Simões
Marín, Oscar Humberto
Martínez-García, Vanessa
Mendes de Azevedo-Júnior, Severino
da Silva Neto, Edvaldo Nunes
Oliveira, Paulo E.
Ornelas, J. F.
Ortiz-Pulido, Raúl
Partida-Lara, Ruth
Patiño-González, Blanca Itzel
Najara de Pinho Queiroz, Steffani
Ramírez-Burbano, Mónica B.
Rodrigo Rech, André
Rocca, Márcia Alexandra
Rodrigues, Licléia C.
Rui, Ana Maria
Sazima, Ivan
Sazima, Marlies And I.
Simmons, B. I.
Tinoco, Boris A.
Varassin, Isabela Galarda
Vasconcelos, Marcelo Ferreira De
Vizentin-Bugoni, Jeferson
Watts, Stella
Kennedy, Jonathan D.
Rahbek, Carsten
Schleuning, Matthias
Martín González, Ana M.
Issue Date: 2021
metadata.dc.publisher.journal: Functional Ecology
Abstract: Functional traits can determine pairwise species interactions, such as those between plants and pollinators. However, the effects of biogeography and evolutionary history on trait-matching and trait-mediated resource specialization remain poorly understood. We compiled a database of 93 mutualistic hummingbird–plant networks (including 181 hummingbird and 1,256 plant species), complemented by morphological measures of hummingbird bill and floral corolla length. We divided the hummingbirds into their principal clades and used knowledge on hummingbird biogeography to divide the networks into four biogeographical regions: Lowland South America, Andes, North & Central America, and the Caribbean islands. We then tested: (a) whether hummingbird clades and biogeographical regions differ in hummingbird bill length, corolla length of visited flowers and resource specialization, and (b) whether hummingbirds' bill length correlates with the corolla length of their food plants and with their level of resource specialization. Hummingbird clades dominated by long-billed species generally visited longer flowers and were the most exclusive in their resource use. Bill and corolla length and the degree of resource specialization were similar across mainland regions, but the Caribbean islands had shorter flowers and hummingbirds with more generalized interaction niches. Bill and corolla length correlated in all regions and most clades, that is, trait-matching was a recurrent phenomenon in hummingbird–plant associations. In contrast, bill length did not generally mediate resource specialization, as bill length was only weakly correlated with resource specialization within one hummingbird clade (Brilliants) and in the regions of Lowland South America and the Andes in which plants and hummingbirds have a long co-evolutionary history. Supplementary analyses including bill curvature confirmed that bill morphology (length and curvature) does not in general predict resource specialization. These results demonstrate how biogeographical and evolutionary histories can modulate the effects of functional traits on species interactions, and that traits better predict functional groups of interaction partners (i.e. trait-matching) than resource specialization. These findings reveal that functional traits have great potential, but also key limitations, as a tool for developing more mechanistic approaches in community ecology. A free Plain Language Summary can be found within the Supporting Information of this article. © 2021 British Ecological Society
metadata.dc.identifier.doi: 10.1111/1365-2435.13784
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