Are some weeds sleeping? Some concepts and reasons

SummarySleeper weeds, a relatively new concept, are defined as a sub-group of invasive plant species for which their population sizes are known to have increased significantly more than 50 years after they became naturalized. The invasions of the European herb Hieracium pilosella into New Zealand, the northeast Asian Fallopia japonica and the Sicilian Senecio squalidus into Britain are presented as well-documented examples of sleeper weeds. While the concept of sleeper weeds has gained some acceptance with weed managers, its application remains a retrospective activity at present. Genetic factors, environmental suitability and anthropogenic disturbance are discussed as they affect sleeper weed status. Accurate botanical records for invasive species over long periods of time are relatively rare and limit documentation of the phenomenon. Some mathematical and ecological problems remain with the concept and its wider application to weed invasion, including the adequacy of the species level for determining sleeper weed status in genetically diverse and widely distributed groups of invasive plants.

[1]  C. G. Vucetich,et al.  Tussock grassland communities in the Mackenzie Country, South Canterbury, New Zealand , 1964 .

[2]  R. Peakall,et al.  Amplified fragment length polymorphism (AFLP) reveals introgression in weedy Onopordum thistles: hybridization and invasion , 1999, Molecular ecology.

[3]  W. Parsons,et al.  Noxious Weeds of Australia , 2001 .

[4]  R. Abbott,et al.  Plant invasions, interspecific hybridization and the evolution of new plant taxa. , 1992, Trends in ecology & evolution.

[5]  Martin Mortimer,et al.  Dynamics of weed populations , 1995 .

[6]  M. Hollingsworth,et al.  Hybridisation and clonal diversity in some introduced Fallopia species (Polygonaceae) , 2000 .

[7]  I. Kowarik,et al.  Time lags in biological invasions with regard to the success and failure of alien species. , 1995 .

[8]  Richard N. Mack,et al.  Invasion of Bromus tectorum L. into Western North America: An ecological chronicle , 1981 .

[9]  M. Soulé,et al.  Lag times in population explosions of invasive species: causes and implications , 1999 .

[10]  M. Rejmánek,et al.  Invasive vascular plants of California. , 1991 .

[11]  J. Levine,et al.  Biological Invasions , 2004 .

[12]  J. Ohwi.  Flora of Japan , 1984 .

[13]  A. P. Conolly,et al.  The distribution and history in the British Isles of some alien species of Polygonum and Reynoutria , 1977 .

[14]  V. Hill,et al.  Variation in Chondrilla juncea L. in south-eastern Australia , 1973 .

[15]  A. P. Conolly,et al.  Prize-winners to pariahs - a history of Japanese knotweed s.l. (Polygonaceae) in the British Isles. , 2000 .

[16]  Harrison,et al.  BIOLOGICAL FLORA OF THE BRITISH ISLES † No , 2004 .

[17]  H. Comes,et al.  Hybrid origin of the Oxford Ragwort, Senecio squalidus L: morphological and allozyme differences between S. squalidus and S. rupestris Waldst. and Kit. , 2000 .

[18]  D. Beerling,et al.  Fallopia japonica (Houtt.) Ronse Decraene (Reynoutria japonica Houtt. ; Polygonum cuspidatum Sieb. & Zucc.) , 1994 .

[19]  M Rejmánek,et al.  Plant invasions — the role of mutualisms , 2000, Biological reviews of the Cambridge Philosophical Society.