Landscape conservation and local interactions with non-crop plants aid in structuring bee assemblages in organic tropical agroecosystems

Assunção, Rafaela M.; Camargo, Nícholas F. de; Souza, Luan S.; Rocha, Eneas M.; Tostes, Gustavo M.; Sujii, Edison Ryoiti; Pires, Carmen S. S.; Togni, Pedro Henrique Brum

doi:10.1007/s10841-022-00438-8

Cited by 5 publications

(6 citation statements)

References 85 publications

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“…Similarly, a tendency to generate modules due to trait-matching between interaction partners has been observed in Neotropical plant-pollinator networks (Olesen et al, 2007;Vizentin-Bugoni et al, 2018), as well as a change in abundance in the most generalist floral visitors in the network (Watts et al, 2016). In addition, interactions between non-crop plants and bees have been observed to be modular and robust in tropical agroecosystems in Brazil, which suggested spatial habitat partitioning among bee species (Assunção et al, 2022). The coexistence of low connected and highly modular networks with high nested structures has been described for other mutualistic networks (Fortuna et al, 2010;Landaverde-González et al, 2021).…”

Section: E Ects On Interaction Networkmentioning

confidence: 81%

“…These metrics allow to visualize how interactions are assembled at community level, and also to indirectly assess ecosystem functions as pollination stability and robustness (Kaiser-Bunbury and Blüthgen, 2015;Kaiser-Bunbury et al, 2017;Burrascano et al, 2018). Some studies have shown that along with pollinator diversity, plant-pollinator network attributes such as robustness, nestedness and modularity, differ across seasons suggesting spatial and temporal niche partitioning between pollinator species (Souza et al, 2018;Rabeling et al, 2019;Escobedo-Kenefic et al, 2020;Stein et al, 2021;Assunção et al, 2022). Also, genetic diversity in the plant trophic level may act as a buffer to minimize the effect of landscape structure on ecological interaction networks (Landaverde-González et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Landscape or local? Distinct responses of flower visitor diversity and interaction networks to different land use scales in agricultural tropical highlands

Escobedo-Kenefic

Casiá-Ajché²,

Cardona³

et al. 2022

Front. Sustain. Food Syst.

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Land use change has been identified as a cause for biodiversity loss and has significant effects on pollinators and their interactions with plants. Interaction network analyses complement diversity estimators by providing information on the stability and functionality of the plant-pollinator community in an ecosystem. However, how land use changes affect insect diversity, and the structure of their plant-insect interaction networks, could depend on the intensity of the disturbance but also may be a matter of scale. Our study was carried out in a tropical highland landscape dominated by intense, yet diverse, small-scale agriculture. We studied the effects of land use, at a landscape scale, and local cover and plant ecological descriptors, at a local scale; on diversity descriptors of insect pollinator communities, the abundance of the most frequent flower visitors, and their interaction networks. Seminatural vegetation favored insect flower visitors at both scales. At the landscape scale, human settlements positively influenced bee diversity, and seminatural areas favored the abundance of frequent hoverfly and bumblebee species. At the local scale, bare soil cover negatively influenced honeybee abundance while flower-rich covers positively related to bumblebee abundance. Only local scale variables had influence on network metrics. Bare soil cover was related to higher network specialization, probably due to a low rate of honeybee interactions. Flower-rich covers negatively influenced network connectance but favored modularity. These results suggest that flower resources, provided by weed areas and flowering crops, promote a high rate of interactions between trophic levels and a non-random structure in the interaction networks that may be helping to sustain network stability. Our results highlight the role of seminatural vegetation, at both scales, in maintaining stable insect pollinator communities and interactions in heterogeneous agricultural landscapes of the tropics.

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Section: E Ects On Interaction Networkmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Landscape or local? Distinct responses of flower visitor diversity and interaction networks to different land use scales in agricultural tropical highlands

Escobedo-Kenefic

Casiá-Ajché²,

Cardona³

et al. 2022

Front. Sustain. Food Syst.

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“…The observed modular structure in our network appears to be a common characteristic of both natural (Maruyama et al, 2014;Olesen & Jordano, 2002;Schleuning et al, 2012;Souza et al, 2022;Vizentin-Bugoni et al, 2018) and human-dominated landscapes (Assunção et al, 2022) in the Cerrado. Modularity is expected to increase with species richness and habitat heterogeneity, which can be explained by two mechanisms that are not mutually exclusive (Olesen et al, 2007).…”

Section: Discussionmentioning

confidence: 63%

“…The extinction and coextinction of species pose a significant threat to plant-pollinator networks (Assunção et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Untangling biodiversity interactions: A meta network on pollination in Earth's most diverse tropical savanna

Aguiar,

Diniz,

Bueno‐Rocha

et al. 2024

Ecology and Evolution

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Pollination is vital for ecosystem functioning, especially in biodiversity‐rich regions like the Brazilian Cerrado. Our research establishes a comprehensive meta network of pollinator–plant interactions within this biome. We quantified the importance of different pollinator groups, identifying keystone species. We examined potential biases in sampling effort and the spatial behavior of interactions within the heterogeneous Cerrado plant physiognomies. Our investigation uncovered 1499 interactions among 293 plant species and 386 visitor species, with legitimate pollination accounting for 42.4% of the interactions. The network exhibited modularity, driven by bees and insects, with vertebrates bridging diurnal and nocturnal modules. While a generalized pattern emerged, high specialization existed within modules due to habitat diversity. Bees, particularly Apis mellifera (exotic) and Trigona spinipes (native), played central roles as network hubs. Hummingbirds and bats, engaged in specialized interactions showing strong connectivity within and between modules. Interestingly, invertebrate–vertebrate modules were more prevalent than expected in the meta network. However, a bias was evident, primarily within specific biogeographical districts with fragmented landscapes and intrusion from other biomes. Variations in plant species and endemism rates influenced pollinator occurrence and the Cerrado network topology. Our study offers valuable insights into pollinator–plant interactions within the Cerrado, encompassing both invertebrates and vertebrates. The modeled network represents a significant step in understanding the structural complexity of pollination networks, integrating partial networks from diverse pollination systems within heterogeneous habitats. Nevertheless, a biogeographical bias could limit a comprehensive understanding of network functionality across the Cerrado.

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“…Although it is unable to vibrate poricidal anthers, it may also pollinate the tomato flowers by licking the pollen, introducing their tongues through the anthers' pore (Bartelli et al., 2021), probably less efficiently than the vibrating pollinators. P. lineata is the most common visitor of tomato flowers in Central‐West Brazil, especially in organic plantations where its frequency can be higher than 75% (Assunção et al., 2022; Bartelli et al., 2021). Therefore, visits by P. lineata were counted.…”

Section: Methodsmentioning

confidence: 99%

The effects of pesticides on tomato pollinators depend on application practices and floral visitor assemblage

Franceschinelli,

Bergamini,

Paniago

et al. 2023

J Applied Entomology

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Pesticide use affects biodiversity and ecosystem service provision. Yet, such effects may vary between pesticides, dosage, application timing and pollinator assemblage in the study area. Understanding such diversity of effects is essential to enable integrated pest management practices that minimize negative impacts on pollinators. Here, we use a controlled experiment to compare different strategies of pesticide application in tomato crops: no application, low‐intensity applications (every 7 days) and high‐intensity application (every 3–4 days) with the last being the usual practice used by farmers in the study region. We focus on imidacloprid that is a neonicotinoid insecticide commonly used in Brazil. We show the negative effects of imidacloprid on the pollinator visitation rate of tomato flowers varied between flower visitor species. While the bee Paratrigona lineata was negatively affected by the imidacloprid application, no effects were detected when analysing all other bees as a group, indicating a null net effect. Although some studies have shown this insecticide is extremely harmful to bees' health, others showed that some bees do not avoid it, which may explain our results. However, the visitation rate recovery for P. lineata was only detected in the less than the more intensive treatment after imidacloprid applications ceased. The fact that no differences in fruit production were detected between treatments (including control blocks) could result from a null net effect of the negative effects on pollinators and positive effects on pest control. Further studies would be needed to disentangle the two effects.

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Landscape conservation and local interactions with non-crop plants aid in structuring bee assemblages in organic tropical agroecosystems

Cited by 5 publications

References 85 publications

Landscape or local? Distinct responses of flower visitor diversity and interaction networks to different land use scales in agricultural tropical highlands

Landscape or local? Distinct responses of flower visitor diversity and interaction networks to different land use scales in agricultural tropical highlands

Untangling biodiversity interactions: A meta network on pollination in Earth's most diverse tropical savanna

The effects of pesticides on tomato pollinators depend on application practices and floral visitor assemblage

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