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Forskningsartikel - Refereegranskat, 2011

Density and reproductive success of Skylarks Alauda arvensis on organic farms - an experiment with unsown Sylark plots

Berg, Åke; Kvarnbäck, Olle


Skylark plots (unsown plots; 10–25 m2 per ha) in autumn cereal fields have had positive effects on Skylark density and reproductive success on conventional farms in Britain. We tested if the same effect could be found in organic farms in Sweden by comparing paired fields with and without unsown plots in similar settings. We found that the plots had no effect. Skylark density was only associated (negatively) with field size and not with occurrence of Skylark plots, vegetation structure, yield or weed harrowing. Number of clutches per territory was affected by yield (negative) and vegetation cover (positive) but not by Skylark plots. Number of fledglings per clutch showed negative association with yield and visibility through the sward. The amount of weed was larger near Skylark plots from the preceding year than in other parts of the field. The yield (and probably vegetation density) was lower on these fields than in conventional autumn sown fields, but still negative effects of the crop (yield levels) were found.

Publicerad i

Ornis Svecica
2011, Volym: 21, sidor: 3-10

      SLU författare

    • Berg, Åke

      • Centrum för biologisk mångfald, Sveriges lantbruksuniversitet

    UKÄ forskningsämne

    Agricultural Science
    Environmental Sciences related to Agriculture and Land-use

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