Spatially structured population dynamics in feral oilseed rape

Proceedings. Biological Sciences
Michael J Crawley, Susan L Brown

Abstract

We studied the population dynamics of feral oilseed rape (Brassica napus) for 10 years (1993-2002) in 3658 adjacent permanent 100 m quadrats in the verges of the M25 motorway around London, UK. The aim was to determine the relative importance of different factors affecting the observed temporal patterns of population dynamics and their spatial correlations. A wide range of population dynamics was observed (downward or upward trends, cycles, local extinctions and recolonizations), but overall the populations were not self-replacing (lambda < 1). Many quadrats remained unoccupied throughout the study period, but a few were occupied at high densities for all 10 years. Most quadrats showed transient oilseed rape populations, lasting 1-4 years. There were strong spatial patterns in mean population density, associated with soil conditions and the successional age of the plant community dominating the verge, and these large-scale spatial patterns were highly consistent from year to year. The importance of seed spilled from trucks in transit to the processing plant at Erith in Kent was confirmed: rape populations were significantly higher on the 'to Erith' verge than the 'from Erith' verge (overall mean 2.83-fold greater stem density)....Continue Reading

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Citations

Jul 10, 2009·Environmental Science and Pollution Research International·Alexis L Knispel, Stéphane M McLachlan
Jan 20, 2012·Environmental Science and Pollution Research International·Douglas J MunierW Thomas Lanini
Jul 14, 2005·Proceedings. Biological Sciences·Michael B BonsallMichael P Hassell
Jul 7, 2012·PloS One·Muthukumar V BagavathiannanRene C Van Acker
Jan 16, 2013·PloS One·Moritz von der LippeMatthias Wichmann
Aug 7, 2013·Environmental Science and Pollution Research International·Mirco HechtClaudia Bagutti
May 7, 2014·Journal of Medical Toxicology : Official Journal of the American College of Medical Toxicology·Daniel A Goldstein
Oct 13, 2016·Environmental Science and Pollution Research International·J FranzaringW Züghart
Sep 18, 2016·Environmental Science and Pollution Research International·Claudio E PandolfoMiguel Cantamutto
Jun 29, 2021·EFSA Journal·UNKNOWN EFSA Panel on Genetically Modified Organisms (GMO)Anna Lanzoni

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