Evidence of forage distance limitations for small bees (Hymenoptera: Apidae)

Wright, I. R.; Roberts, Stuart P. M.; Collins, Bonnie E.

doi:10.14411/eje.2015.028

Cited by 59 publications

(54 citation statements)

References 28 publications

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“…; Wright et al. ). Furthermore, it is widely used in studies linking bee assemblages and landscape composition (Holzschuh et al., ; Somme et al.…”

Section: Methodsmentioning

confidence: 98%

“…The effect of landscape composition on bee assemblages has been previously studied at larger scales, that is, 1 km (Blaauw and Isaacs 2014;Hopfenm€ uller et al 2014) up to 3 km (Steffan-Dewenter et al 2002Westphal et al 2003). We chose a 500 m radius because it encompasses the estimated mean flight distances of the majority of wild bees species (Gathmann and Tscharntke 2002;Araujo et al 2004;Franz en et al 2009;Zurbuchen et al 2010;Wright et al 2015). Furthermore, it is widely used in studies linking bee assemblages and landscape composition (Holzschuh et al, 2008;Somme et al 2014), especially within urbanization contexts Banaszak-Cibicka and _ Zmihorski 2012;Geslin et al 2013;Fortel et al 2014).…”

Section: Study Sitesmentioning

confidence: 99%

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The proportion of impervious surfaces at the landscape scale structures wild bee assemblages in a densely populated region

Geslin

Féon

Folschweiller

et al. 2016

Ecology and Evolution

137

115

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Given the predicted expansion of cities throughout the world, understanding the effect of urbanization on bee fauna is a major issue for the conservation of bees. The aim of this study was to understand how urbanization affects wild bee assemblages along a gradient of impervious surfaces and to determine the influence of landscape composition and floral resource availability on these assemblages. We chose 12 sites with a proportion of impervious surfaces (soil covered by parking, roads, and buildings) ranging from 0.06% to 64.31% within a 500 m radius. We collected using pan trapping and estimated the landscape composition of the sites within a 500 m radius and the species richness of plant assemblages within a 200 m radius. We collected 1104 bees from 74 species. The proportion of impervious surfaces at the landscape scale had a negative effect on wild bee abundance and species richness, whereas local flower composition had no effect. Ground‐nesting bees were particularly sensitive to the urbanization gradient. This study provides new evidences of the impact of urbanization on bee assemblages and the proportion of impervious surfaces at the landscape scale emerged as a key factor that drives those assemblages.

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“…; Wright et al. ). Furthermore, it is widely used in studies linking bee assemblages and landscape composition (Holzschuh et al., ; Somme et al.…”

Section: Methodsmentioning

confidence: 98%

Section: Study Sitesmentioning

confidence: 99%

The proportion of impervious surfaces at the landscape scale structures wild bee assemblages in a densely populated region

Geslin

Féon

Folschweiller

et al. 2016

Ecology and Evolution

137

115

View full text Add to dashboard Cite

show abstract

“…Small species were also particularly sensitive to intensive agriculture, perhaps because larger species are able to forage further from their nest (Greenleaf et al 2007;Wright, Roberts & Collins 2015). These results suggest that the placement of floral margins will need careful planning with respect to species' nesting habitats (Wright, Roberts & Collins 2015). Long-distance foraging may increase susceptibility to some landscape-scale threats (e.g.…”

Section: Responsementioning

confidence: 99%

Ecological traits affect the sensitivity of bees to land‐use pressures in European agricultural landscapes

Palma

Kuhlmann

Roberts

et al. 2015

Journal of Applied Ecology

Self Cite

138

132

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Summary Bees are a functionally important and economically valuable group, but are threatened by land‐use conversion and intensification. Such pressures are not expected to affect all species identically; rather, they are likely to be mediated by the species' ecological traits.Understanding which types of species are most vulnerable under which land uses is an important step towards effective conservation planning.We collated occurrence and abundance data for 257 bee species at 1584 European sites from surveys reported in 30 published papers (70 056 records) and combined them with species‐level ecological trait data. We used mixed‐effects models to assess the importance of land use (land‐use class, agricultural use‐intensity and a remotely‐sensed measure of vegetation), traits and trait × land‐use interactions, in explaining species occurrence and abundance.Species' sensitivity to land use was most strongly influenced by flight season duration and foraging range, but also by niche breadth, reproductive strategy and phenology, with effects that differed among cropland, pastoral and urban habitats. Synthesis and applications. Rather than targeting particular species or settings, conservation actions may be more effective if focused on mitigating situations where species' traits strongly and negatively interact with land‐use pressures. We find evidence that low‐intensity agriculture can maintain relatively diverse bee communities; in more intensive settings, added floral resources may be beneficial, but will require careful placement with respect to foraging ranges of smaller bee species. Protection of semi‐natural habitats is essential, however; in particular, conversion to urban environments could have severe effects on bee diversity and pollination services. Our results highlight the importance of exploring how ecological traits mediate species responses to human impacts, but further research is needed to enhance the predictive ability of such analyses.

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“…This is probably due to the fact that the vast majority of wild bees utilizes resources (foraging, nesting) within an area, which by far exceeds our local scale (local flower abundance and diversity was measured within 1 ha at the centre of each site, which equals a circle with a radius of 56.5 m; Fig. C) (Gathmann & Tscharntke, ; Wright et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Landscape spatial configuration is a key driver of wild bee demographics

et al. 2016

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The majority of studies investigating the effects of landscape composition and configuration on bee populations have been conducted in regions of intensive agricultural production, ignoring regions which are dominated by seminatural habitats, such as the islands of the Aegean Archipelago. In addition, research so far has focused on the landscape impacts on bees sampled in cropped fields while the landscape effects on bees inhabiting seminatural habitats are understudied. Here, we investigate the impact of the landscape on wild bee assemblages in 66 phryganic (low scrubland) communities on 8 Aegean islands. We computed landscape metrics (total area and total perimeter-area ratio) in 4 concentric circles (250, 500, 750, and 1000 m) around the center of each bee sampling site including 3 habitat groups (namely phrygana, cultivated land, and natural forests). We further measured the local flower cover in 25 quadrats distributed randomly at the center of each sampling site. We found that the landscape scale is more important than the local scale in shaping abundance and species richness of bees. Furthermore, habitat configuration was more important than the total area of habitats, probably because it affects bees' movement across the landscape. Phrygana and natural forests had a positive effect on bee demographics, while cultivated land had a negative effect. This demonstrates that phryganic specialists drive bee assemblages in these seminatural landscapes. This finding, together with the shown importance of landscape scale, should be considered for the management of wild bees with special emphasis placed on the spatial configuration of seminatural habitats.

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Evidence of forage distance limitations for small bees (Hymenoptera: Apidae)

Cited by 59 publications

References 28 publications

The proportion of impervious surfaces at the landscape scale structures wild bee assemblages in a densely populated region

The proportion of impervious surfaces at the landscape scale structures wild bee assemblages in a densely populated region

Ecological traits affect the sensitivity of bees to land‐use pressures in European agricultural landscapes

Landscape spatial configuration is a key driver of wild bee demographics

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