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Anders Nielsen

Avdelingsleder

11 Publikasjoner
3 Prosjekter

Divisjon for matproduksjon og samfunn

Kulturlandskap og biomangfold

(+47) 913 50 435
anders.nielsen@nibio.no

Sted
Ås - Bygg R9

Besøksadresse
Raveien 9, 1430 Ås

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Kjetil Hindar Lars Robert Hole Kyrre Kausrud Martin Malmstrøm Espen Rimstad Lucy Robertson Odd Terje Sandlund Eva Bonsak Thorstad Knut Vollset Hugo de Boer Katrine Eldegard Nina Johanna Järnegren Lawrence R. Kirkendall Inger Elisabeth Måren Anders Nielsen Erlend Birkeland Nilsen Eli Knispel Rueness Gaute Velle

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Thomas Sawe Anders Nielsen Katrine Eldegard

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Global economic value of agriculture production resulting from animal pollination services has been estimated to be $235–$577 billion. This estimate is based on quantification of crops that are available at the global markets, and mainly originates from countries with precise information about quantities of agriculture production, exports, and imports. In contrast, knowledge about the contribution of pollinators to household food and income in small-scale farming at local and regional scales is still lacking, especially for developing countries where the availability of agricultural statistics is limited. Although the global decline in pollinator diversity and abundance has received much attention, relatively little effort has been directed towards understanding the role of pollinators in small-scale farming systems, which feed a substantial part of the world’s population. Here, we have assessed how local farmers in northern Tanzania depend on insect-pollinated crops for household food and income, and to what extent farmers are aware of the importance of insect pollinators and how they can conserve them. Our results show that local farmers in northern Tanzania derived their food and income from a wide range of crop plants, and that 67% of these crops depend on animal pollination to a moderate to essential degree. We also found that watermelon—for which pollination by insects is essential for yield—on average contributed nearly 25% of household income, and that watermelons were grown by 63% of the farmers. Our findings indicate that local farmers can increase their yields from animal pollinated crops by adopting more pollinator-friendly farming practices. Yet, we found that local farmers’ awareness of pollinators, and the ecosystem service they provide, was extremely low, and intentional actions to conserve or manage them were generally lacking. We therefore urge agriculture authorities in Tanzania to act to ensure that local farmers become aware of insect pollinators and their important role in agriculture production.

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Thomas Sawe Katrine Eldegard Ørjan Totland Samora Macrice Anders Nielsen

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Agricultural practices to improve yields in small‐scale farms in Africa usually focus on improving growing conditions for the crops by applying fertilizers, irrigation, and/or pesticides. This may, however, have limited effect on yield if the availability of effective pollinators is too low. In this study, we established an experiment to test whether soil fertility, soil moisture, and/or pollination was limiting watermelon (Citrullus lanatus) yields in Northern Tanzania. We subjected the experimental field to common farming practices while we treated selected plants with extrafertilizer applications, increased irrigation and/or extra pollination in a three‐way factorial experiment. One week before harvest, we assessed yield from each plant, quantified as the number of mature fruits and their weights. We also assessed fruit shape since this may affect the market price. For the first fruit ripening on each plant, we also assessed sugar content (brix) and flesh color as measures of fruit quality for human consumption. Extra pollination significantly increased the probability of a plant producing a second fruit of a size the farmer could sell at the market, and also the fruit sugar content, whereas additional fertilizer applications or increased irrigation did not improve yields. In addition, we did not find significant effects of increased fertilizer or watering on fruit sugar, weight, or color. We concluded that, insufficient pollination is limiting watermelon yields in our experiment and we suggest that this may be a common situation in sub‐Saharan Africa. It is therefore critically important that small‐scale farmers understand the role of pollinators and understand their importance for agricultural production. Agricultural policies to improve yields in developing countries should therefore also include measures to improve pollination services by giving education and advisory services to farmers on how to develop pollinator‐friendly habitats in agricultural landscapes.

Forfattere

Johan A. Stenberg Anders Nielsen Per Hans Micael Wendell Beatrix Alsanius Paal Krokene Christer Magnusson Mogens Nicolaisen Iben Margrete Thomsen Sandra Wright Trond Rafoss

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Anders Nielsen Bjørn Arild Hatteland Martin Malmstrøm Ted von Proschwitz Gaute Velle Hugo de Boer Jan Ove Gjershaug Lawrence R. Kirkendall Eli Knispel Rueness Vigdis Vandvik

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Hugo de Boer Maria Gulbrandsen Asmyhr Hanne Hegre Grundt Kjersti Sjøtun Hans K. Stenøien Jan Ove Gjershaug Kjetil Hindar Lawrence R. Kirkendall Nina Elisabeth Nagy Anders Nielsen Eli Knispel Rueness Odd Terje Sandlund Gaute Velle

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Anders Nielsen Merethe Aasmo Finne Maria Gulbrandsen Asmyhr Jan Ove Gjershaug Lawrence R. Kirkendall Vigdis Vandvik Gaute Velle Hugo de Boer Kjetil Hindar Nina Elisabeth Nagy Eli Knispel Rueness Odd Terje Sandlund Kjersti Sjøtun Hans K. Stenøien

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Anders Nielsen Vibeke Lind Geir Steinheim Øystein Holand

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In Norway domestic sheep are mostly kept on mountain pastures over summer. Previous studies have shown that climate conditions affect the growth of mountain grazing lambs in contrasting ways. We analysed a data-set from the Tjøtta Research farm in northern Norway comprising weights and growth of 8696 lambs over 17 years. The lambs grazed coastal or a mountain pasture, 15 km apart. We found that the lambs grew faster when grazing the mountain pasture. Spring and integrated Normalized Difference Vegetation Index (NDVI) affected only the lambs grazing in the mountains. Winter conditions (North Atlantic Oscillation) and summer temperature had a positive effect on growth in both pastures while spring temperature and spring NDVI were important only in the mountains. The positive effect of spring NDVI suggests that the mountain pasture will produce bigger lambs under future climate warming, while the lambs on the coastal pasture will be less affected.

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Anders Nielsen Vibeke Lind Geir Steinheim Øystein Holand

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Anders Nielsen Nigel Yoccoz Geir Steinheim Geir Olve Storvik Yngve Rekdal Michael Angeloff Nathalie Pettorelli Øystein Holand Atle Mysterud

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Erik Trømborg Anders Nielsen Hans Fredrik Hoen Erling Thuen Odd Magne Harstad Torstein H. Garmo Harald Volden Øystein Holand Svein Jarle Horn Vincent Eijsink John Morken Petter H Heyerdahl Hanne Kathrine Sjølie Birger Solberg Lars Bakken Trine Aulstad Sogn Tormod Briseid Arne Grønlund Simen Gjølsjø Bjørn Langerud Nicholas Clarke

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Universitetet for miljø- og biovitenskap fikk i mai 2007 i oppdrag fra Norges Forskningsråd å kartlegge og beskrive kunnskapsstatus og forskningsbehov knyttet til bioenergi og klimagasser fra landbruket (jord, skog og utmark). Utredningen beskriver i korte trekk dagens status og hovedutfordringer når det gjelder produksjon av bioenergi og utslipp/binding av klimagasser i landbruket, og peker på sentrale forskningsbehov og forskningsoppgaver som kan bidra til å møte disse utfordringene. Rapporten er basert på bidrag fra forskningsmiljøene på Campus Ås.