ollinator-mediated facilitation alleviates pollen limitation in a plant-hummingbird networ

Autor(es)

Bergamo, Pedro Joaquim ^{[1, 2]} ; Freitas, Leandro ^[1] ; Sazima, Marlies ^[3] ; Wolowski, Marina ^[4]

Afiliação do(s) autor(es)

^[1] Inst Pesquisas Jardim Bot Rio de Janeiro, Rio De Janeiro - Brazil

^[2] Univ Estadual Campinas, Programa Posgrad Ecol, Bertrand Russel Av, POB 6109, Campinas - Brazil

^[3] Univ Estadual Campinas, Inst Biol, Plant Biol Dept, Campinas - Brazil

^[4] Univ Fed Alfenas, Inst Nat Sci, Alfenas - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Oecologia; v. 198, n. 1, p. 205-217, JAN 2022.
• Citações Web of Science: 0

Resumo

Facilitation and competition among plants sharing pollinators have contrasting consequences for plant fitness. However, it is unclear whether pollinator-mediated facilitation and competition may affect pollen limitation (potential contribution of pollination to fitness) in pollination networks. Here, we investigated how pollinator sharing affects pollen limitation in a tropical hummingbird-pollinated community marked by facilitation. We employed indices describing how much a plant species potentially affects the pollination of other co-flowering species through shared pollinators (acting degree) and is affected by other co-flowering species (target degree) within the plant-hummingbird network. Since facilitation often increases pollination quantity but not necessarily quality, we expected both indices to be associated with reductions in pollen limitation estimates that depend on pollination quantity (fruit set and seed number) rather than estimates more strictly related to quality (seed weight and germination). We found that both indices were associated with reductions in pollen limitation only for seed weight and germination. Thus, facilitation occurred via qualitative estimates of pollen limitation. Our results suggest that facilitation may enhance plant fitness estimates even if quantitative components of plant fecundity are already saturated. Overall, we showed that pollinator-mediated indirect effects in a multispecies context are important drivers of plant fitness estimates with consequences for coexistence in diverse communities. (AU)

• Processo FAPESP: 18/02996-0 - Moduladores ecológicos e evolutivos da limitação polínica em uma rede trófica da uma ilha do Mediterrâneo
• Beneficiário: Pedro Joaquim Bergamo
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 16/06434-0 - Interações planta-polinizador em comunidades e a estruturação de atributos funcionais e do sucesso reprodutivo
• Beneficiário: Pedro Joaquim Bergamo
• Modalidade de apoio: Bolsas no Brasil - Doutorado