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Insect pollination of oilseed rape

Lindström, Sandra A.M. (2017). Insect pollination of oilseed rape. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2017:18
ISBN 978-91-576-8809-5
eISBN 978-91-576-8810-1
[Doctoral thesis]

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Ecological intensification of agriculture is suggested as a way to reach higher crop yields without increasing inputs that may degrade the environment. Increased insect pollination in crops, such as oilseed rape, Brassica napus, has been suggested to increase yields, but is rarely integrated in crop management. To determine the value of enhanced crop pollination as a means of ecological intensification, reliable estimates of how yield is affected by insect pollination are needed. Further, little is known about interactions between insect pollination and other crop management factors such as cultivar, nitrogen fertilization, pest control, and irrigation. Finally, it needs to be assessed how increasing crop pollination by adding honey bees to crops impact the wild fauna of flower-visiting insects.

I addressed these issues in two sets of experiments. First, I performed a landscape-scale experiment with replicated whole fields of winter oilseed rape. I manipulated the pollinator community by adding honey bee hives or controlled the surroundings for absence of honey bees. I chose fields such that they were embedded in either intensive-ly cropped landscapes or heterogeneous landscapes with more semi-natural pastures, expecting greater diversity of wild pollinators in the latter. In two cultivar types, I examined how honey bee addition affected crop yield and the wild pollinator community. Second, I performed two field plot experiments, in winter and in spring oilseed rape, to assess how insect pollination and the crop management factors cultivar, nitrogen fertili-sation, pest control, and irrigation interactively shaped crop yield.

Insect pollination increased winter oilseed rape yield, but only in open-pollinated cultivars. Cultivars of open-pollinated type gave higher yields than cultivars of hybrid type. Thus, phasing out open-pollinated cultivars from the market emerges a missed opportunity for increased yields.

I show that the crop’s access to water, nitrogen, and herbivory affect pollinator behaviour and potentially crop pollination. Interestingly, insect pollination tended to increase yields when no nitrogen was applied, indicating higher nutrient use efficiency in plants with access to insect pollination. Adding managed honey bee hives had nega-tive effects on the densities of wild flying- and flower-visiting insects, with potential negative effects on crop pollination and biodiversity conservation. Overall, my thesis demonstrates the importance of including both agronomic and environmental perspectives when developing crop production systems that are productive and sustainable.

Authors/Creators:Lindström, Sandra A.M.
Title:Insect pollination of oilseed rape
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2017
Depositing date:15 March 2017
Number of Pages:57
ILindström, S.A.M., Herbertsson, L., Rundlöf, M., Smith, H.G., & Bom-marco, R. (2016) Large-scale pollination experiment demonstrates the importance of insect pollination in winter oilseed rape. Oecologia, 180, 759-769. http://dx.doi.org/10.1007/s00442-015-3517-x
IILindström, S.A.M., Herbertsson, L., Rundlöf, M., Bommarco, R., & Smith, H.G. (2016) Experimental evidence that honeybees depress wild insect densities in a flowering crop. Proceedings of the Royal Society B, 283: 20161641. http://dx.doi.org/10.1098/rspb.2016.1641
IIIMarini, L., Tamburini, G., Petrucco-Toffolo, E., Lindström, S.A.M., Mosca, G., Zanetti, F., & Bommarco, R. (2015) Crop management modifies the benefits of insect pollination in oilseed rape. Agriculture, Ecosystems and Environment, 207, 61–66. http://dx.doi.org/10.1016/j.agee.2015.03.027
IVLindström, S.A.M., Klatt, B.K., Smith, H.G., & Bommarco, R. Pest control affects crop yield components and bee behaviour in oilseed rape. (submitted).
Place of Publication:Uppsala
Publisher:Department of Ecology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8809-5
ISBN for electronic version:978-91-576-8810-1
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F01 Crop husbandry
F Plant production > F63 Plant physiology - Reproduction
P Natural resources > P01 Nature conservation and land resources
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Environmental Sciences related to Agriculture and Land-use
Agrovoc terms:brassica napus, winter crops, pollen, pollination, honey bees, useful insects, apis, bombus, crop yield, plant animal relations, nitrogen fertilizers, environmental impact, pest insects
Keywords:Brassica napus, competition, pollination, yield, cultivar, ecological intensification, interactions, Apis, Bombus, pollen beetles
Permanent URL:
ID Code:14182
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
External funders:Jordbruksverket / Swedish Board of Agriculture and Stiftelsen Lantbruksforskning
Deposited By: Sandra Lindström
Deposited On:15 Mar 2017 15:09
Metadata Last Modified:10 Sep 2020 13:41

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