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Factors affecting the species composition of arable field boundary vegetation / David Kleijn in Journal of applied ecology, 37 ([01/01/2000]) 

Public Citation [article]  inJournal of applied ecology > 37 [01/01/2000] . - 256-266 Titre : Factors affecting the species composition of arable field boundary vegetation Type de document : Électronique Auteurs : David Kleijn, Auteur ; Marein Verbeek, Auteur Année de publication : 2000 Article en page(s) : 256-266 Langues : Anglais (eng) Lien pérenne : DOI : 10.1046/j.1365-2664.2000.00486.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=144359 Kleijn, David, Verbeek, Marein 2000 Factors affecting the species composition of arable field boundary vegetation. Journal of applied ecology, 37: 256-266.

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Consultable Article (2000) URL

Genetic introgression from distant provenances reduces fitness in local weed populations / M Keller in Journal of applied ecology, 37 ([01/01/2000]) 

Public Citation [article]  inJournal of applied ecology > 37 [01/01/2000] . - 647-659 Titre : Genetic introgression from distant provenances reduces fitness in local weed populations Type de document : Imprimé Auteurs : M Keller ; Johannes Kollmann (1963-) ; Peter John Edwards (1948-) Année de publication : 2000 Article en page(s) : 647-659 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Messicole Résumé : 1. Seed mixtures of wildflowers are used increasingly in schemes to restore biodiversity in intensively managed farmland. Usually, the seed mixtures are produced by commercial suppliers and they may be distributed over large geographical distances. It is therefore important to ask what problems may arise from using seed that is not of local origin. The aim of this study was to evaluate one potential problem, namely the effects of genetic introgression of foreign provenances on the fitness of local weed populations. 2. The problem was investigated using the arable weed species Agrostemma githago, Papaver rhoeas and Silene alba, all of which are commonly included in commercial seed mixtures in Switzerland. Hybrids (F1 and F2 backcrosses) were made between local Swiss plants and plants of English, German and Hungarian provenance (plus F1 from one US source in Silene). In a field experiment the growth of the hybrid plants was compared with that of the parents. Above-ground dry matter after one growing season was taken as a measure of fitness. Additionally, survivorship and seed mass were determined for some of the hybrids. 3. The biomass data revealed negative outbreeding effects caused by epistasis in all four F2 backcrosses of Papaver and in the F2 of Agrostemma hybridized with plants of German provenance; no such effects were found in Silene. Survival was slightly lower in the F1 hybrids of Papaver, and considerably reduced in the F2 backcrosses. For Silene, a heterosis effect was evident in seed mass in the F1 generation, while seed mass decreased in the F2. The same trend, although less strong, was also observed in Agrostemma. 4. The results suggest that only plants of relatively local origin should be used in wildflower mixtures, although it is not possible to specify precisely over what distance seed can safely be transferred. The same recommendation is also valid for schemes to reinvigorate endangered plant populations. The relevance of the fitness components that were measured, and the long-term effects of genetic introgressions, are discussed. Lien pérenne : DOI : 10.1046/j.1365-2664.2000.00517.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=148918 Keller, M, Kollmann, Johannes (1963-), Edwards, Peter John (1948-) 2000 Genetic introgression from distant provenances reduces fitness in local weed populations. Journal of applied ecology, 37: 647-659.

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Consultable Article (2000) URL

Effects of grazing by free-ranging cattle on vegetation dynamics in a continental north-west European heathland / Jan Bokdam in Journal of applied ecology, 37 ([01/01/2000]) 

Public Citation [article]  inJournal of applied ecology > 37 [01/01/2000] . - 415-431 Titre : Effects of grazing by free-ranging cattle on vegetation dynamics in a continental north-west European heathland Type de document : Imprimé Auteurs : Jan Bokdam ; J. Maurits Gleichman Année de publication : 2000 Article en page(s) : 415-431 Langues : Français (fre) Mots-clés : Calluna vulgaris (L.) Hull  Deschampsia flexuosa Lien pérenne : DOI : 10.1046/j.1365-2664.2000.00507.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=151804 Bokdam, Jan, Gleichman, J. Maurits 2000 Effects of grazing by free-ranging cattle on vegetation dynamics in a continental north-west European heathland. Journal of applied ecology, 37: 415-431.

Documents numériques

Consultable Article (2000) URL