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. 2015 Jun 16:6:7414.
doi: 10.1038/ncomms8414.

Delivery of crop pollination services is an insufficient argument for wild pollinator conservation

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Delivery of crop pollination services is an insufficient argument for wild pollinator conservation

David Kleijn et al. Nat Commun. .

Erratum in

  • Corrigendum: Delivery of crop pollination services is an insufficient argument for wild pollinator conservation.
    Kleijn D, Winfree R, Bartomeus I, Carvalheiro LG, Henry M, Isaacs R, Klein AM, Kremen C, M'Gonigle LK, Rader R, Ricketts TH, Williams NM, Adamson NL, Ascher JS, Báldi A, Batáry P, Benjamin F, Biesmeijer JC, Blitzer EJ, Bommarco R, Brand MR, Bretagnolle V, Button L, Cariveau DP, Chifflet R, Colville JF, Danforth BN, Elle E, Garratt MP, Herzog F, Holzschuh A, Howlett BG, Jauker F, Jha S, Knop E, Krewenka KM, Le Féon V, Mandelik Y, May EA, Park MG, Pisanty G, Reemer M, Riedinger V, Rollin O, Rundlöf M, Sardiñas HS, Scheper J, Sciligo AR, Smith HG, Steffan-Dewenter I, Thorp R, Tscharntke T, Verhulst J, Viana BF, Vaissiére BE, Veldtman R, Ward KL, Westphal C, Potts SG. Kleijn D, et al. Nat Commun. 2016 Feb 18;7:10841. doi: 10.1038/ncomms10841. Nat Commun. 2016. PMID: 26887922 Free PMC article. No abstract available.

Abstract

There is compelling evidence that more diverse ecosystems deliver greater benefits to people, and these ecosystem services have become a key argument for biodiversity conservation. However, it is unclear how much biodiversity is needed to deliver ecosystem services in a cost-effective way. Here we show that, while the contribution of wild bees to crop production is significant, service delivery is restricted to a limited subset of all known bee species. Across crops, years and biogeographical regions, crop-visiting wild bee communities are dominated by a small number of common species, and threatened species are rarely observed on crops. Dominant crop pollinators persist under agricultural expansion and many are easily enhanced by simple conservation measures, suggesting that cost-effective management strategies to promote crop pollination should target a different set of species than management strategies to promote threatened bees. Conserving the biological diversity of bees therefore requires more than just ecosystem-service-based arguments.

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Figures

Figure 1
Figure 1. The relative contribution of individual species in wild bee communities to crop pollination.
(a) The rank distribution of the contribution of wild bee species to crop production value in their biogeographical area. Dominant species, contributing at least 5% of all visits within a given study, are indicated in blue. Bars indicate 95% confidence intervals. (b) The cumulative number of bee species known to exist in the countries in which the studies were done, compared with an asymptotic estimate of the number of species that visit the flowers of the studied crops (Chao1 estimator), and the number of dominant crop-visiting wild bee species. Lightly dashed lines indicate estimates±s.e.
Figure 2
Figure 2. The relation between dominant crop-visiting bee species and cover of semi-natural habitats in agricultural landscapes.
(a) The proportion of dominant crop-visiting bee species in bee communities in habitats other than flowering crops is negatively related to the proportion of semi-natural habitat within a 1,000-m radius (F1,14=14.47, P=0.002). (b) The relation between the proportion of semi-natural habitat in agricultural landscapes and bee abundance differs between dominant crop-visiting species and all other bee species (interaction type of bee and cover semi-natural habitat: X21,31=8.20, P=0.004). Lines indicate back-transformed model predictions for dominant (dashed) and all other bee species (solid). (c) The relation between the proportion of semi-natural habitat in agricultural landscapes and the bee species richness differs between dominant crop-visiting species and all other species (interaction type of bee and cover semi-natural habitat: X21,31=7.84, P=0.005). Lines indicate back-transformed model predictions for dominant (dashed) and all other bee species (solid).
Figure 3
Figure 3. The effect of measures mitigating biodiversity loss on dominant crop-visiting bee species.
Bars indicate mean pooled abundance (±s.e.) of dominant crop-visiting bee species on sites with management measures mitigating biodiversity loss compared with control sites in nine different studies. Abbreviations and test statistics: DE—Germany, F1,40=12.69, P<0.001; HU—Hungary, F1,38=1.13, P=0.295; NL—Netherlands, F1,39=0.36, P=0.553; CH—Switzerland, F1,39=1.29, P=0.263; UK—United Kingdom, F1,39=4.97, P=0.032; CA1—California study 1, F1,37=6.97, P=0.012; CA2—California study 2, F1,9=29.83, P<0.001; MI—Michigan, F1,5.6=15.10, P=0.009; NJ—New Jersey; F1,10=10.06, P=0.010. *P<0.05, **P<0.01, ***P<0.001.

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