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Auteur Arne Saatkamp |
Documents disponibles écrits par cet auteur (6)
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 : [Thématique] Malherbologie Bogaard, A., Hodgson, J.G., Whitlam, J., Aumeeruddy-Thomas, Y., Delauge, J., Huc, S., Vanderpert, H., Saatkamp, A., Pavon, D., 2020 - Adventices des champs céréaliers en agriculture biologique sur le territoire de Sault, en Haute-Provence: Identification et écologie, [éditeur inconnu], [lieu de publication inconnu], 101 p.Documents numériques
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Livret (2020)Adobe Acrobat PDFBryophytes du Parc national du Mercantour : méthodes et résultats de la campagne d'inventaires 2010 ATBI+M / Arne Saatkamp in Biocosme Mésogéen, 28 (2) (2011)
Titre : Bryophytes du Parc national du Mercantour : méthodes et résultats de la campagne d'inventaires 2010 ATBI+M Type de document : Imprimé Auteurs : Arne Saatkamp ; Michele Aleffi ; Marta Biaggi de ; Sébastien Delhaye ; Cédric Dentant (1976-) ; Aurélie Désamoré ; Jan-Peter Frahm (1945-2014) ; Jean-Pierre Hébrard ; Benjamin Laenen ; Marie-France Leccia ; Michael Lüth (1955-) ; Lucca Miserere ; Benoît Offerhaus ; Marc Philippe ; Michela Tacchi Année de publication : 2011 Article en page(s) : 33-50 Langues : Français (fre) Catégories : [Thématique] Bryophytes
[Géographique] Parc national du MercantourMots-clés : Haplomitrium Grimmia Résumé : Dans le cadre de l’ATBI+M (All Taxa Biodiversity Inventory + Monitoring) Mercantour-Alpi-Marittime nous avons pu identifier 234 taxons de bryophytes (mousses et hépatiques) au sein du Parc national du Mercantour. Ce nombre d’espèces recensées complète les données de campagnes anciennes, notamment de Jean-Pierre Hébrard (IMEP, Marseille) depuis 1965 ainsi que des campagnes de terrain menées dans le cadre de l’ATBI depuis 2007. Ce nombre d’espèces est basé sur les espèces documentées réellement sur le territoire du Parc, cœur et zone périphérique, observées en quatre jours en juillet et août 2010 et présente donc probablement un nombre sous-estimé des espèces réellement présentes. Nos observations dans le cadre du ATBI en 2010 ont pu mettre en évidence des espèces nouvelles pour ce territoire, dont plusieurs espèces remarquables et rares à l’échelle nationale comme Haplomitrium hookeri ou encore des espèces inscrites à la directive Habitat comme Buxbaumia viridis et Orthotrichum rogeri. Au vu de la rareté de leurs habitats, les espèces de milieux humides de haute altitude, des combes à neige et des éboulis de blocs sont les plus remarquables.
in Biocosme Mésogéen > 28 (2) (2011) . - 33-50Saatkamp, A., Aleffi, M., Biaggi de, M., Delhaye, S., Dentant, C., Désamoré, A., Frahm, J.P., Hébrard, J.P., Laenen, B., Leccia, M.F., Lüth, M., Miserere, L., Offerhaus, B., Philippe, M., Tacchi, M., 2011 - Bryophytes du Parc national du Mercantour : méthodes et résultats de la campagne d'inventaires 2010 ATBI+M ; Biocosme Mésogéen, 28 (2) : 33-50.Documents numériques
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Article (2011)URL
Titre : Germination traits explain soil seed persistence across species: the case of Mediterranean annual plants in cereal fields Type de document : Imprimé Auteurs : Arne Saatkamp ; Laurence Affre (1969-) ; Thierry Dutoit (1967-) ; Peter Poschlod Année de publication : 2011 Article en page(s) : 415-426 Langues : Anglais (eng) Catégories : [Thématique] Messicole
[Thématique] Longévité des semences
[Thématique] Semences
[Thématique] Techniques de germinationRésumé : Background and Aims. Seed persistence in the soil under field conditions is an important issue for the maintenance of local plant populations and the restoration of plant communities, increasingly so in the light of rapidly changing land use and climate change. Whereas processes important for dispersal in space are well known, knowledge of processes governing dispersal in time is still limited. Data for morphological seed traits such as size have given contradictory results for prediction of soil seed persistence or cover only a few species. There have been few experimental studies on the role of germination traits in determining soil seed persistence, while none has studied their predictive value consistently across species. Delayed germination, as well as light requirements for germination, have been suggested to contribute to the formation of persistent seed banks. Moreover, diurnally fluctuating temperatures can influence the timing of germination and are therefore linked to seed bank persistence. Methods. The role of germination speed measured by T50 (days to germination of 50 % of all germinated seeds), light requirement and reaction to diurnally fluctuating temperatures in determining seed persistence in the soil was evaluated using an experimental comparative data set of 25 annual cereal weed species. Key Results. It is shown that light requirements and slow germination are important features to maintain seeds ungerminated just after entering the soil, and hence influence survival of seeds in the soil. However, the detection of low diurnally fluctuating temperatures enhances soil seed bank persistence by limiting germination. Our data further suggest that the effect of diurnally fluctuating temperatures, as measured on seeds after dispersal and dry storage, is increasingly important to prevent fatal germination after longer burial periods. Conclusions. These results underline the functional role of delayed germination and light for survival of seeds in the soil and hence their importance for shaping the first part of the seed decay curve. Our analyses highlight the detection of diurnally fluctuating temperatures as a third mechanism to achieve higher soil seed persistence after burial which interacts strongly with season. We therefore advocate focusing future research on mechanisms that favour soil seed persistence after longer burial times and moving from studies of morphological features to exploration of germination traits such as reaction to diurnally fluctuating temperatures. Identifiant pérenne : DOI : 10.1093/aob/mcq255
in Annals of Botany > 107 (3) (March 2011) . - 415-426Saatkamp, A., Affre, L., Dutoit, T., Poschlod, P., 2011 - Germination traits explain soil seed persistence across species: the case of Mediterranean annual plants in cereal fields ; Annals of Botany, 107 (3) : 415-426.Documents numériques
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Article (2011)URL
Titre : Plant traits and population characteristics predict extinctions in a long‑term survey of Mediterranean annual plants Type de document : Électronique Auteurs : Arne Saatkamp, Auteur ; Laurence Affre (1969-), Auteur ; Thierry Dutoit (1967-), Auteur ; Peter Poschlod, Auteur Année de publication : 2018 Article en page(s) : 2527-2540 Langues : Anglais (eng) Catégories : [Thématique] Malherbologie
[Thématique] MessicoleRésumé : Global and local environmental changes lead to frequent plant extinctions many of which occur in man-made habitats such as agricultural fields. Plant traits and site conditions modify risks of extinction, but strength and sense of their effect are not known yet. Here, we present a long-term survey of population sizes for Mediterranean annual plants that we revisited 20 years after their first record to evaluate climate, population size, traits and habitat requirements as drivers of local extinctions. Small populations had an increased probability of extinction in our data-set. Our analyses revealed that seed production and survival of seeds in the soil seed bank decreased extinction rate, whereas plant size increased extinction probability. Mean annual temperature increased extinction rates of annual plants in cereal fields. We discuss these effects as a response to recent and ongoing habitat changes, and discuss how traits may be used to guide conservation practices in the face of local extinctions. Identifiant pérenne : DOI : 10.1007/s10531-018-1551-9 / HAL : hal-01915740
in Biodiversity and conservation > 27 (2018) . - 2527-2540Saatkamp, A., Affre, L., Dutoit, T., Poschlod, P., 2018 - Plant traits and population characteristics predict extinctions in a long‑term survey of Mediterranean annual plants ; Biodiversity and conservation, 27 : 2527-2540.Documents numériques
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Article (2018)Adobe Acrobat PDF
Titre : Population dynamics and functional traits of annual plants - a comparative study on how rare and common arable weeds persist in agroecosystems Type de document : Imprimé Auteurs : Arne Saatkamp Editeur : Regensburg : Universität Regensburg Année de publication : 2009 Importance : 220 p. Langues : Anglais (eng) Catégories : [Thématique] Banque de semences dans le sol
[Thématique] Climax, succession plantes, dynamique végétation
[Thématique] Mauvaises herbesRésumé : The continuing industrialisation of agriculture leads to important changes in composition and decrease of plant diversity in European agro-ecosystems. Remnants of traditional agriculture conserved many but declining rare cereal weeds in South Eastern France. Conservation efforts for them are hampered by the little evidence on which differences in their biology are related to population persistence, abundance and rarity among species. Data on longevity of seeds in the soil, an important factor for annual plant population dynamics, can help to prioritise conservation efforts. The main aim of the present thesis was therefore to study the relations between long-term population persistence, abundance and rarity together with life history, physiologic and seed traits in order to identify species most at risk. We studied annual plants -simple and rapidly reacting- in arable fields -an environment with rapid and drastic changes. First, we analysed plant α- and β-diversity in vineyards at different spatial scales, using additive diversity partitioning. We identified habitat types, intensity of agriculture, landscape type and land use history as main determinants for plant diversity and maintenance of species of conservation interest. Nearly all target species are known to be cereal weeds; we therefore restricted the study on rare and common relatives of annual cereal weeds for the remainder of the study. Soil seed banks are known to be an important life stage in annual plants for population dynamics. Therefore, we did a comparative seed burial experiment with 38 species to study soil seed survival and levels of dormancy. The striking differences with previous data motivated us to re-evaluated current methods. This showed that the soil seed bank persistence estimates from seedling emergence method and derived seed longevity index (L.I.) are correlated to seed production but not to soil seed mortality. Third, we re-analysed soil seed survival with data from germination experiments. Light requirement, degree of dormancy, reaction to diurnally fluctuating temperatures and seed size were related to survival of seeds in the soil giving insights into how long-lived species can stay ungerminated while buried. Fourth, we compared data on soil seed survival, degree of dormancy, seed size and number, specific leaf area, leaf dry matter content and pollen:ovule ratio (P/O) to data on local population extinction and turnover from 1983 to 2005 and 2006, in an approach using phylogenetically independent contrasts (PICs). This revealed that soil seed survival was a major correlate of extinction on the long time step and that this could not be explained by directional changes in edaphic factors. Finally, we studied two axes of rarity, local population size and regional frequency of populations and their relation to biological and life history traits. This yielded few results consistent among different dates. An exception was soil seed survival; probably in relation with increased effective population size. Both analyses -on rarity and on regression- emphasised also the role of P/O –a monitor for gene exchange via pollen- for rarity and regression of annual cereal weeds. In conclusion, species with high soil seed mortality and low P/O are most at risk of local extinction and should be considered in conservation efforts. The germination ecology together with the soil seed survival indicated that temporal variability and unfavourable years can trigger annual cereal weed diversity through storage effect. However, there are striking differences between species. For the most regressing species seed dispersal via uncleaned seed material is necessary to conserve them at the long run in rapidly changing agro-ecosystems. En ligne : https://epub.uni-regensburg.de/14995/ Saatkamp, A., 2009 - Population dynamics and functional traits of annual plants - a comparative study on how rare and common arable weeds persist in agroecosystems, Universität Regensburg, Regensburg, 220 p.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21960 7070 Thèse et mémoire Centre de documentation Bibliothèque Consultable Documents numériques
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Thèse (2009)Adobe Acrobat PDF
