Pollinator community responses to the spatial population structure of wild plants: A pan-European approach

Nielsen, Anders; Dauber, Jens; Kunin, William E.; Lamborn, Ellen; Jauker, Birgit; Moora, Mari; Potts, Simon G.; Reitan, Trond; Roberts, Stuart P. M.; Sõber, Virve; Settele, Josef; Steffan‐Dewenter, Ingolf; Tscheulin, Thomas; Vaitis, Michail; Vivarelli, Daniele; Biesmeijer, Jacobus C.; Petanidou, Theodora

doi:10.1016/j.baae.2012.08.008

Cited by 26 publications

(26 citation statements)

References 35 publications

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“…Whether honeybees are antagonistic to other bee species was assessed by comparing the flower visitation rates of honeybees and wild bees (including bumblebees). Nielsen et al (2012) found a positive correlation between honeybee and bumblebee visitation rates, whereas the relationship between honeybees and solitary bees varied from being positive, negative or insignificant, depending on the plant species. Interaction between honey and wild bees be even more complex: analysing the effects of mass-flowering rapeseed (a flower visited by short-tongued pollinators) on the relative abundance of long-tongued and short-tongued bumblebees, Diekötter et al (2010) found that the density of longtongued bumblebees visiting long-tubed flowers decreased as the amount of rapeseed increased, leading to a distortion in plant-pollinator interactions.…”

Section: Interactions Between Wild and Domestic Pollinators In Weed-cmentioning

confidence: 92%

“…Land use changes can alter the spatial structure of wild plant populations, which may in turn affect the attractiveness of flower aggregations to different groups of pollinators at different spatial scales (Nielsen et al 2012). Bees may be affected both locally by farm management and by the surrounding landscape.…”

Section: Assessing Competition For Spatial Use Of Landscape Featuresmentioning

confidence: 99%

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Weeds for bees? A review

Bretagnolle

Gaba

2015

Agron. Sustain. Dev.

240

126

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Agricultural intensification has led to the decrease of the diversity of wild and domestic pollinators. For instance, honeybees declined by 59 % in 61 years in the USA. About 35 % of major crops in the world depend on pollination services, and 3-8 % of world crop production will disappear without pollinators. Indeed, pollination provides several ecosystem services such as enabling crop and honey productions, regulating weeds and other cultural services. Agricultural intensification has also decreased weed diversity by about 50 % in 70 years because massive herbicide sprays have reduced the competition between weeds and crops. Nevertheless, weeds are at the basis of agricultural foodwebs, providing food to many living organisms. In particular, weeds provide flowers for pollinating insects including honey and wild bees. Here, we review the decline of weeds and bees. We discuss the effect of bees and pollination on crop production. We describe the complex interactions between bee pollinators, e.g. honey and wild bees, and landscape habitats such as crop fields and seminatural elements. For that, we focus on spatial and temporal effects on flower resources. We show that weed abundance can reduce crop yields, thus inducing conflict with farmers.But weed abundance enhances regulating services by ensuring the survival of honeybees in the absence of oil seed crops. Weed abundance also enhances pollination services and, in turn, honey yield for the benefit of beekeepers. Weed abundance has also improved the survival of wild flora and the socio-cultural value of landscapes, a major request from the public. From those findings, we present a conceptual framework allowing to define ecological engineering options based upon ecosystem services of weeds and pollinators.

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Section: Interactions Between Wild and Domestic Pollinators In Weed-cmentioning

confidence: 92%

Section: Assessing Competition For Spatial Use Of Landscape Featuresmentioning

confidence: 99%

Weeds for bees? A review

Bretagnolle

Gaba

2015

Agron. Sustain. Dev.

240

126

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“…; Nielsen et al . ). Such optimal foraging behaviour is likely to have consequences to the plant–plant interactions for pollinator visitation and likely to be a function of the density of floral resources (Kunin ; Hegland, Grytnes & Totland ).…”

Section: Introductionmentioning

confidence: 97%

“…; Nielsen et al . ). The scale dependency of pollinator assemblages and crop production has received considerable more attention.…”

Section: Introductionmentioning

confidence: 97%

Floral neighbourhood effects on pollination success in red clover are scale‐dependent

Hegland

2014

Functional Ecology

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Summary1. Plant-pollinator interactions are highly important because of its direct link to plant fitness and because such interactions involve species at different trophic levels. Our understanding of competitive and facilitative interactions among plants for pollination is of large importance to govern conservation of species and management of crop production. Still we know little about the scale dependency of plant-plant interactions for pollinator visitation which is central to both basic and applied ecology.2. Here, I tested whether plant-plant interactions for bumblebee visitation and subsequent reproduction were scale-dependent by studying the ecologically and economically important red clover (Trifolium pratense) and its floral neighbourhood. I expected that high floral densities at small scale could trigger facilitative interactions due to concentration effects of pollinators. This was expected to change into competitive interactions when floral densities became higher at coarser scales because of dilution effects. I also expected that increased bumblebee visitation would increase fruit production in red clover. 3. The interaction for pollination success in red clover appeared to be scale-dependent in the landscape under study. At plot scale, the bumblebee visitation rate to red clover inflorescences increased with both intra-and interspecific floral density, indicating facilitative interaction for pollinator visitation among red clover flowers and its nearest floral neighbourhood. Increased visitation of bumblebees led to subsequent increased fruit set, but there was a saturating effect as fruit set did not increase when visitation rates exceeded a certain level. As the floral neighbourhood became denser at a coarser scale, the interactions for pollinator visitation changed towards competition. 4. This study shows that key ecological processes such as plant-pollinator interactions may indeed be scale-dependent and that the relative importance of competition and facilitation among plants for attracting pollinators may change with scale. The density of the floral neighbourhood of a focal species (e.g. key-, rare-, crop species) may thus be of large importance for its pollination and fruit production. My findings suggest that increasing floral densities at fine scales may have facilitative effects on pollinator visitation to red clover, whereas pollinators may be drawn away when floral resources become denser at coarser scale.

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“…The video camera was set up to record insect activity simultaneously on between one and three orchid spikes (individual plants of O. galilaea only produce one flowering spike) from 09:00 to 16:30 h over a period of 21 days. The number of flowers visited was determined and visits to different flowers by the same individual insect was treated as a separate event (Nielsen et al 2012). Each insect visitor was recorded and assigned to the best recognizable classification unit (Tscheulin and Petanidou 2010).…”

Section: Direct Observationsmentioning

confidence: 99%

Ecological interactions of the sexually deceptive orchid Orchis galilaea

Machaka-Houri

Houri

Knio

et al. 2018

Journal of Plant Interactions

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Plant species dependent on highly specific interactions with pollinators are vulnerable to environmental change. Conservation strategies therefore require a detailed understanding of pollination ecology. This two-year study examined the interactions between the sexually deceptive orchid, Orchis galilaea, and its pollinator Lasioglossum marginatum. Relationships were investigated across three different habitats known to support O. galilaea (garrigue, oak woodland, and mixed oak/pine woodland) in Lebanon. Visitation rates to flowers were extremely low and restricted to male bees. The reproductive success of O. galilaea under ambient conditions was 29.3% (±2.4), compared to 89.0% (±2.1) in plants receiving cross-pollination by hand. No difference in reproductive success was found between habitat types, but values of reproductive success were positively correlated to the abundance of male bees. Pollination limitation can have negative impacts on the population growth of orchids, and this study provides clear evidence for more holistic approaches to habitat conservation to support specific interactions. ARTICLE HISTORY

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Pollinator community responses to the spatial population structure of wild plants: A pan-European approach

Cited by 26 publications

References 35 publications

Weeds for bees? A review

Weeds for bees? A review

Floral neighbourhood effects on pollination success in red clover are scale‐dependent

Ecological interactions of the sexually deceptive orchid Orchis galilaea

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