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Auteur John Gavin Hodgson (1945-) |
Documents disponibles écrits par cet auteur (4)
Affiner la rechercheAdventices des champs céréaliers en agriculture biologique sur le territoire de Sault, en Haute-Provence: Identification et écologie / Amy Bogaard (2020)
Titre : Adventices des champs céréaliers en agriculture biologique sur le territoire de Sault, en Haute-Provence: Identification et écologie Type de document : Imprimé Auteurs : Amy Bogaard, Auteur ; John Gavin Hodgson (1945-), Auteur ; Jade Whitlam, Auteur ; Yildiz Aumeeruddy-Thomas, Auteur ; Julie Delauge, Auteur ; Stéphanie Huc (1975-), Auteur ; Héloïse Vanderpert, Auteur ; Arne Saatkamp, Auteur ; Daniel Pavon, Auteur Année de publication : 2020 Importance : 101 p. ISBN/ISSN/EAN : 978-1-83820-021-3 Langues : Français (fre) Catégories : [CBNPMP-Thématique] Malherbologie Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=144354 Bogaard, Amy, Hodgson, John Gavin (1945-), Whitlam, Jade, Aumeeruddy-Thomas, Yildiz, Delauge, Julie, Huc, Stéphanie (1975-), Vanderpert, Héloïse, Saatkamp, Arne, Pavon, Daniel , 2020. Adventices des champs céréaliers en agriculture biologique sur le territoire de Sault, en Haute-Provence: Identification et écologie. , . 101 pp.Documents numériques
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Livret (2020)Adobe Acrobat PDFEcological correlates of seed persistence in soil in the north-west European flora / Ken Thompson (1998)
Titre : Ecological correlates of seed persistence in soil in the north-west European flora Type de document : Tiré à part de revue Auteurs : Ken Thompson (1954-) ; Jan Pouwel Bakker ; Renée Marlies Bekker (1967-) ; John Gavin Hodgson (1945-) Année de publication : 1998 Importance : 301-309 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Banque de semences dans le sol
[CBNPMP-Thématique] Conservation des semences
[CBNPMP-Thématique] DormanceRésumé : 1 Using the data in a recently published seed bank database for north-west Europe, we describe how a species’ seed bank behaviour can be characterized by a single ‘longevity index’, and investigate how representative the information in the database is of the north-west European flora. We also test the hypotheses that seeds of short-lived species are more persistent than those of long-lived species, and long-lived seeds are characteristic of species living in disturbed habitats. 2 The data are not representative of the north-west European flora as a whole; they are a fair reflection of a research effort that has been largely directed towards grassland and arable weeds. Data for rare species, non-agricultural habitats in general and wetlands, rocky habitats and native woodland in particular, are scarce or absent. 3 Annuals and biennials almost always have more persistent seeds than related perennials, and this difference is most striking when, as in Anagallis arvensis and Aphanes arvensis, the short-lived species have moved well away from the ‘core’ habitat of the family. Confamilial monocarps and polycarps do not differ consistently in seed mass. 4 Gradients of habitat disturbance are accompanied by predictable changes in seed persistence, which are themselves often (but not always) accompanied by parallel shifts in seed size. These results suggest that increasing habitat disturbance (i.e. increasing density-independent mortality) always selects for increased seed persistence, confirming both theory and previous analyses. However, increased seed persistence is not always associated with reduced seed size. This is because persistence depends not only on seed size, but on other traits, many of them physiological. In many habitats the probability of seed burial is strongly linked to seed size and shape, but in arable habitats cultural practices have broken this link. Lien pérenne : DOI : 10.1046/j.1365-2745.1998.00240.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=134189 Thompson, Ken (1954-), Bakker, Jan Pouwel, Bekker, Renée Marlies (1967-), Hodgson, John Gavin (1945-) 1998 Ecological correlates of seed persistence in soil in the north-west European flora. Journal of ecology, 86 : 301-309.Documents numériques
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Article (1998)URLSpecific leaf area and dry matter content estimate thickness in laminar leaves / Denis Vile in Annals of Botany, 96 (2005)
Titre : Specific leaf area and dry matter content estimate thickness in laminar leaves Type de document : Imprimé Auteurs : Denis Vile (1977-) ; Eric Garnier (1959-) ; Bill Shipley (1960-) ; Gérard Laurent ; Marie-Laure Navas ; Catherine Roumet ; Sandra Lavorel (1965-) ; Sandra Díaz ; John Gavin Hodgson (1945-) ; Francisco Lloret ; Guy F. Midgley ; Hendrik Poorter ; Mike C. Rutherford ; Peter J. Wilson ; Ian J. Wright Année de publication : 2005 Article en page(s) : 1129-1136 Langues : Français (fre) Catégories : [CBNPMP-Thématique] Revégétalisation Résumé : Background and Aims Leaf thickness plays an important role in leaf and plant functioning, and relates to a species' strategy of resource acquisition and use. As such, it has been widely used for screening purposes in crop science and community ecology. However, since its measurement is not straightforward, a number of estimates have been proposed. Here, the validity of the (SLA × LDMC)−1 product is tested to estimate leaf thickness, where SLA is the specific leaf area (leaf area/dry mass) and LDMC is the leaf dry matter content (leaf dry mass/fresh mass). SLA and LDMC are two leaf traits that are both more easily measurable and often reported in the literature. Methods The relationship between leaf thickness (LT) and (SLA × LDMC)−1 was tested in two analyses of covariance using 11 datasets (three original and eight published) for a total number of 1039 data points, corresponding to a wide range of growth forms growing in contrasted environments in four continents. Key Results and Conclusions The overall slope and intercept of the relationship were not significantly different from one and zero, respectively, and the residual standard error was 0·11. Only two of the eight datasets displayed a significant difference in the intercepts, and the only significant difference among the most represented growth forms was for trees. LT can therefore be estimated by (SLA × LDMC)−1, allowing leaf thickness to be derived from easily and widely measured leaf traits. Lien pérenne : DOI : 10.1093/aob/mci264 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=150726
in Annals of Botany > 96 (2005) . - 1129-1136Vile, Denis (1977-), Garnier, Eric (1959-), Shipley, Bill (1960-), Laurent, Gérard, Navas, Marie-Laure, Roumet, Catherine, Lavorel, Sandra (1965-), Díaz, Sandra, Hodgson, John Gavin (1945-), Lloret, Francisco, Midgley, Guy F., Poorter, Hendrik, Rutherford, Mike C., Wilson, Peter J., Wright, Ian J. 2005 Specific leaf area and dry matter content estimate thickness in laminar leaves. Annals of Botany, 96: 1129-1136.Documents numériques
Article (2005)URL
Titre : Specific leaf area and leaf dry matter content as alternative predictors of plant strategies Type de document : Imprimé Auteurs : Peter J. Wilson ; Ken Thompson (1954-) ; John Gavin Hodgson (1945-) Année de publication : 1999 Article en page(s) : 155-162 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Revégétalisation Résumé : A key element of most recently proposed plant strategy schemes is an axis of resource capture, usage and availability. In the search for a simple, robust plant trait (or traits) that will allow plants to be located on this axis, specific leaf area is one of the leading contenders. Using a large new unpublished database, we examine the variability of specific leaf area and other leaf traits, the relationships between them, and their ability to predict position on the resource use axis. Specific leaf area is found to suffer from a number of drawbacks; it is both very variable between replicates and much influenced by leaf thickness. Leaf dry-matter content (sometimes referred to as tissue density) is much less variable, largely independent of leaf thickness and a better predictor of location on an axis of resource capture, usage and availability. However, it is not clear how useful dry matter content will be outside northwest Europe, and in particular in dry climates with many succulents. Lien pérenne : DOI : 10.1046/j.1469-8137.1999.00427.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=150731
in New Phytologist > 143 (1999) . - 155-162Wilson, Peter J., Thompson, Ken (1954-), Hodgson, John Gavin (1945-) 1999 Specific leaf area and leaf dry matter content as alternative predictors of plant strategies. New Phytologist, 143: 155-162.Documents numériques
Article (1999)URL
