Effects of community composition on plant–pollinator interaction networks across a spatial gradient of oak-savanna habitats

Kelly, Tyler; Elle, Elizabeth

doi:10.1007/s00442-020-04661-5

Cited by 10 publications

(10 citation statements)

References 80 publications

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“…Bee specimens included in this analysis were only those for which floral association data were available (i.e., netted from flowers). Three network metrics were calculated (Dormann, 2021; Kelly & Elle, 2020) including (1) network‐level specialization (

H_{2}^{'}

), (2) modularity ( Q ), and (3) weighted nestedness (WNODF). Network‐level specialization (

H_{2}^{'}

) measures the selectiveness of each species within a network to determine the degree of interaction specialization compared to expected probability distributions, where 1 is a totally specialized and 0 is generalized (Blüthgen et al, 2006).…”

Section: Methodsmentioning

confidence: 99%

Forest restoration treatments indirectly diversify pollination networks via floral‐ and temperature‐mediated effects

Davies,

Davis,

Griswold

2023

Ecological Applications

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In North American conifer forests a variety of federally initiated thinning programs are implemented to restore pre‐European settlement forest structures, but these changes may impact ecosystem function via impacts on sensitive biotic communities. Across the wildland‐urban interface of the Front Range region of Colorado, agencies associated with the ‘Collaborative Forest Landscape Restoration Program’ (CFLRP) have implemented thinning treatments across thousands of hectares of ponderosa pine forest; here we leverage these treatments as an experimental framework to examine thinning effects on a pollinator community. We measured variation in forest structure and sampled bee community assemblages using multiple methods (trapping and netting) to compare bee biodiversity and patterns of floral visitation by bees (bee‐flower networks) between mechanically thinned stands that were 3‐10 years post‐treatment and non‐thinned stands. Three key findings emerged: (1) Native bee abundance, richness, and diversity were 120, 53, and 37% greater, respectively, in thinned stands. Nestedness, richness, and abundance of bee‐flower interactions were all substantially higher in thinned stands, and there was increased functional redundancy in bee assemblages after thinning. (2) Structural equation modelling indicated that variation in temperature and floral abundance were mediated by canopy openness and were correlated with bee richness and abundance, thereby indirectly driving variation in bee‐flower interactions. (3) Four floral species (Penstemon virens, Cerastium arvense, Erysimum capitatum, and Geranium caespitosum) were identified as key connectors in bee‐flower interaction networks, though these were not necessarily the most abundant flowering plants. Our analyses indicate that native bee α‐diversity and bee‐flower interactions positively responded to thinning treatments, and these effects were indirectly driven by canopy removal. We conclude that CFLRP treatments have conservation value for native bee communities. Further monitoring is warranted to evaluate the longevity of these effects.This article is protected by copyright. All rights reserved.

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H_{2}^{'}

), (2) modularity ( Q ), and (3) weighted nestedness (WNODF). Network‐level specialization (

H_{2}^{'}

Section: Methodsmentioning

confidence: 99%

Forest restoration treatments indirectly diversify pollination networks via floral‐ and temperature‐mediated effects

Davies,

Davis,

Griswold

2023

Ecological Applications

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“…they interact more with the same plant species than with plant species in other modules). We expected high network dissimilarity both in space, mainly due to differences in species composition across habitats (Kelly and Elle 2020), and time, mainly due to species turnover (Simanonok and Burkle 2014). Differences in partners' phenology, species abundance and flower density are likely to contribute more to the temporal than to the spatial variability (Simanonok andBurkle 2014, Schwarz et al 2020).…”

Section: Introductionmentioning

confidence: 94%

Spatio‐temporal variation in plant–pollinator interactions: a multilayer network approach

Hervías‐Parejo

Colom

Mas

et al. 2023

Oikos

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Despite the dynamic nature of communities, most research typically treated interaction networks as static entities, and only a few analysed the spatial and the temporal scales simultaneously. Here, we used spatial and temporal multilayer networks to explore the persistence of species and interactions in space and time, as well as the variation of species role (centrality) according to biotic factors. We further investigated, for the first time, the spatio‐temporal variation in multilayer network structure. Species exhibited substantial turnover across time mainly due to differences in species phenology. In contrast, interaction turnover was more pronounced across habitats, which seems to be a common strategy of pollinators to adjust interactions spatially to different ecological scenarios. Plant species were comparatively more important to the cohesiveness of spatial than temporal networks, whereas the centrality of pollinators correlated between scales. The importance of plant species fluctuated temporally due mainly to changes in flower density, whereas that of pollinators fluctuated in space and time according to their relative abundance. Module composition was highly unstable in time. Species were highly capable of changing partners and module affiliation across both scales. We conclude that plant–pollinator interactions are highly dynamic in space and time, and that there are differences between plants and pollinators in their use of resources across habitats and subseasons with implications for the understanding of functional connectivity and multilayer structure.

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“…congesta is an iconic winter annual of threatened oak–savanna habitat in western North America, a key resource for native pollinators (e.g. Adderley & Vamosi, 2015; Kelly & Elle, 2020; Schultz et al, 2010), and ideal for our purposes. P .…”

Section: Introductionmentioning

confidence: 99%

On the capacity for rapid adaptation and plastic responses to herbivory and intraspecific competition in insular populations of Plectritis congesta

Skaien

Arcese

2022

Evolutionary Applications

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A capacity for rapid adaptation should enhance the persistence of populations subject to temporal and spatial heterogeneity in natural selection, but examples from nature remain scarce. Plectritis congesta (Caprifoliaceae) is a winter annual that exhibits local adaptation to browsing by ungulates and hypothesized to show context-dependent trade-offs in traits affecting success in competition versus resistance or tolerance to browsing. We grew P. congesta from 44 insular populations historically exposed or naïve to ungulates in common gardens to (1) quantify genetic, plastic and competitive effects on phenotype; (2) estimate a capacity for rapid adaptation (evolvability); and (3) test whether traits favoured by selection with ungulates present were selected against in their absence. Plants from browsed populations bolted and flowered

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Effects of community composition on plant–pollinator interaction networks across a spatial gradient of oak-savanna habitats

Cited by 10 publications

References 80 publications

Forest restoration treatments indirectly diversify pollination networks via floral‐ and temperature‐mediated effects

Forest restoration treatments indirectly diversify pollination networks via floral‐ and temperature‐mediated effects

Spatio‐temporal variation in plant–pollinator interactions: a multilayer network approach

On the capacity for rapid adaptation and plastic responses to herbivory and intraspecific competition in insular populations of Plectritis congesta

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