Influences of oilseed rape area and aggregation on pollinator abundance and reproductive success of a co-flowering wild plant

Reeth, Colin Van; Michel, Nadia; Bockstaller, Christian; Caro, Gaël

doi:10.1016/j.agee.2019.04.025

Cited by 11 publications

(12 citation statements)

References 59 publications

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“…Overall, pollinator abundance, but not species richness, promoted seed set of both focal plants with generalist pollinator species dominating (>50%). Complex spatial interactions between non‐crop and crop floral resources, however, modulated both seed set and pollinator visitation (Holzschuh et al, 2016; Montero‐Castaño et al, 2016; Van Reeth et al, 2019). While semi‐natural cover reduced C. jacea seed set, a combination of the highest cover of flowering crops and semi‐natural habitats enhanced C. segetum seed production.…”

Section: Discussionmentioning

confidence: 99%

“…Although non‐crop plants can compete with crops (Adeux et al, 2019; Colbach & Cordeau, 2018), they supply trophic resources supporting insect populations providing ecosystem services (Campos et al, 2020; Kovács‐Hostyánszki et al, 2017; Monticelli et al, 2020). The complex connections between non‐crop flowers and crops via multiple interactions of both abundant and rare insect species (Ebeling et al, 2012; Gorden & Adler, 2018; Sauve et al, 2016), and how this plant–insect nexus responds to agroecological management remain poorly understood (Petit et al, 2018; Van Reeth et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Agroecological farming, flowering phenology and the pollinator–herbivore–parasitoid nexus regulate non‐crop plant reproduction

Monticelli

Labonté

Turpin

et al. 2022

Journal of Applied Ecology

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Agroecological farming uses crop and non‐crop plant biodiversity to promote beneficial insects supplying pollination and biocontrol services to crops. Non‐crop plants (sown or weeds) are integral to supporting these beneficial insect species interactions. How the uplift of biotic complexity by agroecological management (crop diversification, ecological infrastructure) influences mutualistic and antagonistic insect interactions regulating the reproduction of non‐crop plants remains less understood. Using a pesticide‐free farm‐scale (125 ha) agroecological experiment, we tested how the individual reproduction of pollinator‐dependent, non‐crop plant species with different flowering phenology (Cyanus segetum, Centaurea jacea) and their mutualistic (pollinator) and antagonistic (seed herbivore–parasitoid) insect interactions were affected by agroecological practices. Seed set and species interactions of replicate C. segetum and C. jacea randomly introduced to field margins were correlated with floral resource heterogeneity at focal plant (e.g. flower display size), local community (floral richness/abundance driven by sown wildflower or grass margins) and local landscape (crop diversification, area of semi‐natural habitat or mass flowering crops) scales. At the seasonal peak of non‐crop floral diversity and abundance, antagonistic interactions weakly regulated C. segetum seed set with gains from pollinator activity predominating. Conversely, C. jacea, which flowered past the peak of non‐crop floral diversity/abundance, benefited from the promotion of seed herbivore parasitism and pollinator activity by the local landscape cover of semi‐natural habitat and mass flowering crops. Synthesis and applications. Agroecological management produced spatial and temporal gradients in crop and non‐crop floral resources that interacted to modify pollinator or seed herbivore–parasitoid interactions and Cyanus segetum and Centaurea jacea seed set. The degree of phenological overlap between C. segetum and C. jacea flowering and floral resources in the local community or landscape dictated the type and level of exposure to insect interactions influencing reproduction. Design of agroecological practices to deliver pollination and biocontrol services must consider how effects will vary with species traits and the mutualistic (pollination) and antagonistic (herbivory, parasitism) interactions governing non‐crop plant reproduction. Agroecological management supporting beneficial insect interactions may feedback to help restore functional non‐crop plant populations and associated biodiversity, potentially reducing the frequency of management interventions (e.g. re‐sowing wildflower strips).

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Agroecological farming, flowering phenology and the pollinator–herbivore–parasitoid nexus regulate non‐crop plant reproduction

Monticelli

Labonté

Turpin

et al. 2022

Journal of Applied Ecology

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“…The flowering periods of oilseed rape and O. acetosella greatly overlap and oilseed rape is highly attractive for various pollinators (Haenke et al 2014 ; Riedinger et al 2015 ). The attraction of pollinators by oilseed rape might lead to diluted pollinators in adjacent forests (Holzschuh et al 2011 ; Van Reeth et al 2019 ), where O. acetosella plants might receive little compatible pollen from other forest patches. However, when oilseed rape cover in the landscape strip was very high and distances between populations were > 2300 m, we observed a reduced genetic differentiation among O. acetosella populations (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Although A. nemorosa starts flowering earlier than oilseed rape, there might be an overlapping flowering period of one or two weeks. Thus, as with O. acetosella , the increased inbreeding signal might result from pollinator dilution (Holzschuh et al 2011 ; Van Reeth et al 2019 ). The positive effect of maize cover on expected heterozygosity of A. nemorosa populations (Fig.…”

Section: Discussionmentioning

confidence: 99%

Context matters: the landscape matrix determines the population genetic structure of temperate forest herbs across Europe

et al. 2021

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Context Plant populations in agricultural landscapes are mostly fragmented and their functional connectivity often depends on seed and pollen dispersal by animals. However, little is known about how the interactions of seed and pollen dispersers with the agricultural matrix translate into gene flow among plant populations. Objectives We aimed to identify effects of the landscape structure on the genetic diversity within, and the genetic differentiation among, spatially isolated populations of three temperate forest herbs. We asked, whether different arable crops have different effects, and whether the orientation of linear landscape elements relative to the gene dispersal direction matters. Methods We analysed the species’ population genetic structures in seven agricultural landscapes across temperate Europe using microsatellite markers. These were modelled as a function of landscape composition and configuration, which we quantified in buffer zones around, and in rectangular landscape strips between, plant populations. Results Landscape effects were diverse and often contrasting between species, reflecting their association with different pollen- or seed dispersal vectors. Differentiating crop types rather than lumping them together yielded higher proportions of explained variation. Some linear landscape elements had both a channelling and hampering effect on gene flow, depending on their orientation. Conclusions Landscape structure is a more important determinant of the species’ population genetic structure than habitat loss and fragmentation per se. Landscape planning with the aim to enhance the functional connectivity among spatially isolated plant populations should consider that even species of the same ecological guild might show distinct responses to the landscape structure.

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“…Because many pollinators utilize both wild plants and crops, sharing local pollinators creates potential fitness implications through interference in visitation rates or pollen transfer ( Stanley and Stout, 2014 ). For example, mass blooming crops can mediate the spatial distribution of pollinators in the landscape, reducing visitation and fitness in co-blooming wild plants ( Holzschuh et al, 2011 ; Van Reeth et al, 2019 ). Conversely, mass crop blooms may augment pollinator populations, increasing spillover and boosting the fitness of wild plants blooming immediately after the crop ( Kovács-Hostyánszki et al, 2013 ).…”

Section: Land Use Change Affects Floral Traits Mediated By Pollinatomentioning

confidence: 99%

Human-Mediated Land Use Change Drives Intraspecific Plant Trait Variation

et al. 2021

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In the Anthropocene, more than three quarters of ice-free land has experienced some form of human-driven habitat modification, with agriculture dominating 40% of the Earth’s surface. This land use change alters the quality, availability, and configuration of habitat resources, affecting the community composition of plants and insects, as well as their interactions with each other. Landscapes dominated by agriculture are known to support a lower abundance and diversity of pollinators and frequently larger populations of key herbivore pests. In turn, insect communities subsidized by agriculture may spill into remaining natural habitats with consequences for wild plants persisting in (semi) natural habitats. Adaptive responses by wild plants may allow them to persist in highly modified landscapes; yet how landscape-mediated variation in insect communities affects wild plant traits related to reproduction and defense remains largely unknown. We synthesize the evidence for plant trait changes across land use gradients and propose potential mechanisms by which landscape-mediated changes in insect communities may be driving these trait changes. Further, we present results from a common garden experiment on three wild Brassica species demonstrating variation in both defensive and reproductive traits along an agricultural land use gradient. Our framework illustrates the potential for plant adaptation under land use change and predicts how defense and reproduction trait expression may shift in low diversity landscapes. We highlight areas of future research into plant population and community effects of land use change.

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Influences of oilseed rape area and aggregation on pollinator abundance and reproductive success of a co-flowering wild plant

Cited by 11 publications

References 59 publications

Agroecological farming, flowering phenology and the pollinator–herbivore–parasitoid nexus regulate non‐crop plant reproduction

Agroecological farming, flowering phenology and the pollinator–herbivore–parasitoid nexus regulate non‐crop plant reproduction

Context matters: the landscape matrix determines the population genetic structure of temperate forest herbs across Europe

Human-Mediated Land Use Change Drives Intraspecific Plant Trait Variation

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