Variation in Plant–Pollinator Network Structure along the Elevational Gradient of the San Francisco Peaks, Arizona

Chesshire, Paige R.; McCabe, Lindsie M.; Cobb, Neil S.

doi:10.3390/insects12121060

Cited by 11 publications

(5 citation statements)

References 76 publications

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“…Nonetheless, the relationship between modules and pollination syndromes has been found in studies that have determined pollinator effectiveness [ 109 ] and others that have not (e.g., [ 84 ]). Therefore, the lack of an association between modules and syndromes may be related to the presence of super-generalist pollinators in high-elevation environments [ 110 , 111 ]. The presence of these super-generalist floral visitors in all modules may disrupt the signature of floral syndromes [ 110 ].…”

Section: Discussionmentioning

confidence: 99%

Elevational and seasonal patterns of plant pollinator networks in two highland tropical ecosystems in Costa Rica

Cristóbal-Perez,

Barrantes,

Cascante-Marín

et al. 2024

PLoS ONE

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Many plant species in high montane ecosystems rely on animal pollination for sexual reproduction, however, our understanding of plant-pollinator interactions in tropical montane habitats is still limited. We compared species diversity and composition of blooming plants and floral visitors, and the structure of plant-floral visitor networks between the Montane Forest and Paramo ecosystems in Costa Rica. We also studied the influence of seasonality on species composition and interaction structure. Given the severe climatic conditions experienced by organisms in habitats above treeline, we expected lower plant and insect richness, as well as less specialized and smaller pollination networks in the Paramo than in Montane Forest where climatic conditions are milder and understory plants are better protected. Accordingly, we found that blooming plants and floral visitor species richness was higher in the Montane Forest than in the Paramo, and in both ecosystems species richness of blooming plants and floral visitors was higher in the rainy season than in the dry season. Interaction networks in the Paramo were smaller and more nested, with lower levels of specialization and modularity than those in the Montane Forest, but there were no seasonal differences within either ecosystem. Beta diversity analyses indicate that differences between ecosystems are likely explained by species turnover, whereas within the Montane Forest differences between seasons are more likely explained by the rewiring of interactions. Results indicate that the decrease in species diversity with elevation affects network structure, increasing nestedness and reducing specialization and modularity.

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Section: Discussionmentioning

confidence: 99%

Elevational and seasonal patterns of plant pollinator networks in two highland tropical ecosystems in Costa Rica

Cristóbal-Perez,

Barrantes,

Cascante-Marín

et al. 2024

PLoS ONE

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“…In the wetter and warmer region, higher elevation is typically associated with colder temperatures, imposing harsher conditions for fungal communities (Figure 1). The increases in connectance and nestedness with elevation may be driven by reduced partner availability between bacteria and fungi, owing to decreased fungal species richness (Chesshire et al., 2021). This might require more bacterial generalists to connect with fungal species, which lead to higher nestedness.…”

Section: Discussionmentioning

confidence: 99%

The structure of bacteria–fungi bipartite networks along elevational gradients in contrasting climates

Zhao,

Soininen,

et al. 2024

Molecular Ecology

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Climate change is altering species distribution and modifying interactions in microbial communities. Understanding microbial community structure and their interactions is crucial to interpreting ecosystem responses to climate change. Here, we examined the assemblages of stream bacteria and fungi, and the associations between the two groups along elevational gradients in two regions with contrasting precipitation and temperature, that is the Galong and Qilian mountains of the Tibetan Plateau. In the wetter and warmer region, the species richness significantly increased and decreased with elevation for bacteria and fungi, respectively, while were nonsignificant in the drier and colder region. Their bipartite network structure was also different by showing significant increases in connectance and nestedness towards higher elevations only in the wetter and warmer region. In addition, these correlation network structure generally exhibited similar positive association with species richness in the wetter and warmer region and the drier and colder region. In the wetter and warmer region, climatic change along elevation was more important in determining connectance and nestedness, whereas microbial species richness exerted a stronger influence on network structure and robustness in the drier and colder region. These findings indicate substantial forthcoming changes in microbial diversity and network structure in warming climates, especially in wetter and warmer regions on Earth, advancing the understanding of microbial bipartite interactions' response to climate change.

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“…In agreement with the findings of Rezende et al (2007b), our results suggested pollinators might be of even greater importance than plants on nestedness structure in our network. For example, more generalized pollinator species were found likely responsible for higher nestedness (Chesshire et al, 2021).…”

Section: Different Influences Of Phylogenetically Independent and Con...mentioning

confidence: 99%

Different influences of phylogenetically conserved and independent floral traits on plant functional specialization and pollination network structure

et al. 2023

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Plant specialization and pollination network structure play important roles in community assembly. Floral traits can mediate plant–pollinator interactions and thus have important impacts on nestedness and modularity of pollination network. When such traits are phylogenetically conserved, therefore, phylogeny and traits should predict network structure to similar degrees. Moreover, conserved network structures were also found attributed to pollination syndrome or pollination system. However, we still know little about the relation between pollination syndrome and pollination network, especially under a phylogenetic framework. Herein, we established a phylogenetic framework including five floral traits (flower density, floral size, floral shape, floral symmetry, and floral color) and five species-level metrics (species strength, weighted closeness, specialization d’, nestedness contribution, and modularity contribution) to test how floral traits could directly or indirectly influence species’ specialization and network structure in central China. Phylogenetic signals were found in all floral traits except flower density. Structural equation model and phylogenetic structural equation model results showed that both floral size and floral density affected plant specialization and its contribution to network modularity indirectly. However, compared with phylogenetic independent flower density, phylogenetic conserved floral size had much more complexed influences, having a direct influence both on species’ specialization and on modularity contribution. In this nested and modular network, abundant species with larger flowers tend to be more central and had larger values of z. Floral shape, symmetry, and color could act as co-flowering filters in pollination sharing and help to shape network modularity. Our results emphasize that phylogenetically conserved traits partially represent pollination syndrome and are important drivers for modular structure of local pollination network. This study may improve the understanding how the evolutionary history and ecological process drive local network structure and dynamics.

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Variation in Plant–Pollinator Network Structure along the Elevational Gradient of the San Francisco Peaks, Arizona

Cited by 11 publications

References 76 publications

Elevational and seasonal patterns of plant pollinator networks in two highland tropical ecosystems in Costa Rica

Elevational and seasonal patterns of plant pollinator networks in two highland tropical ecosystems in Costa Rica

The structure of bacteria–fungi bipartite networks along elevational gradients in contrasting climates

Different influences of phylogenetically conserved and independent floral traits on plant functional specialization and pollination network structure

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