Détail de l'auteur
Auteur Peter Poschlod |
Documents disponibles écrits par cet auteur (9)
Affiner la rechercheDecrease of plant alpha and beta-diversity with management intensity in vineyards and the influence of landscape context / Arne Saatkamp in Ecologia Mediterranea, 40 (2) (2014)
Titre : Decrease of plant alpha and beta-diversity with management intensity in vineyards and the influence of landscape context Type de document : Imprimé Auteurs : Arne Saatkamp ; Laurence Affre (1969-) ; Peter Poschlod ; Philip Roche ; Ulrich Deil ; Thierry Dutoit (1967-) Année de publication : 2014 Article en page(s) : 17-27 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Formation herbeuse, ligneuse (vigne, verger..) Résumé : Diversity of plants in agricultural landscapes is decreasing continually until today and this has cascading effects on ecosystem services and persistence of rare plants. Plant diversity, however, is not equally distributed among different habitat types. On a larger scale differences among habitats can contribute strongly to the global diversity of an agroecosystem. Landscape context and intensity of agriculture can also have effects on diversity. In this work, we present a thorough analysis of -diversity in Mediterranean vineyard ecosystems, showing the effect of geology based landscape units for the outcome of -diversity as well as management intensity for -diversity of threatened plants. The change in diversity according to landscape context emphasizes the importance of landscape heterogeneity and vineyard habitats for local plant diversity. Low intensity agriculture was identified to maintain the highest levels of plant -and -diversity and to promote persistence of rare plants. Identifiant : DOI : 10.3406/ecmed.2014.1255 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=153931
in Ecologia Mediterranea > 40 (2) (2014) . - 17-27Saatkamp, Arne, Affre, Laurence (1969-), Poschlod, Peter, Roche, Philip, Deil, Ulrich, Dutoit, Thierry (1967-) 2014 Decrease of plant alpha and beta-diversity with management intensity in vineyards and the influence of landscape context. Ecologia Mediterranea, 40(2): 17-27.Documents numériques
Consultable
Article (2014)Adobe Acrobat PDF
Titre : Genetic differentiation among populations of Sesleria albicans Kit. ex Schultes (Poaceae) from ecologically different habitats in central Europe Type de document : Imprimé Auteurs : Christoph Reisch ; Peter Poschlod ; R. Wingender Année de publication : 2003 Article en page(s) : 519-527 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Diversité génétique Mots-clés : Sesleri albicans Kit. ex Schultes Résumé : As observed for many other plant species, the populations of Sesleria albicans in Central Europe are located in habitats, which differ to a high degree from each other with regard to ecological factors such as nutrients, light and water as well as in type of land use. The species colonizes limestone cliffs, pavements, screes, grazed and mown grasslands, heaths, fens and open woodlands. In this study, we used random amplified polymorphic DNA (RAPD) analysis to investigate the genetic differentiation among 25 populations of S. albicans from six different types of habitat (beech forests, alpine and lowland rocky ridges, lowland screes, fens, calcareous grasslands). With RAPD analysis, 344 fragments could be amplified, of which 95.9% were polymorphic. The level of polymorphism ranged from 29.7 to 56.7% polymorphic bands per population and was correlated with population size. In an analysis of molecular variance (AMOVA), used to detect variation among individuals within populations, among populations from the same habitat and among different habitats, most of the genetic variation was found within populations (62.06%) and among populations from the same habitat (33.36%). In contrast, only a very low level of differentiation could be observed among different habitats (4.58%). The results of our study give only little evidence for an ecotypic differentiation of Sesleria albicans. This differentiation is principally conceivable, but obviously not related to the investigated RAPD loci. Identifiant : DOI : 10.1038/sj.hdy.6800350 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=148350
in Heredity > 91 (2003) . - 519-527Reisch, Christoph, Poschlod, Peter, Wingender, R. 2003 Genetic differentiation among populations of Sesleria albicans Kit. ex Schultes (Poaceae) from ecologically different habitats in central Europe. Heredity, 91: 519-527.
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 : [CBNPMP-Thématique] Messicole
[CBNPMP-Thématique] Longévité des semences
[CBNPMP-Thématique] Semences
[CBNPMP-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 : DOI : 10.1093/aob/mcq255 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=148474
in Annals of Botany > 107 (3) (March 2011) . - 415-426Saatkamp, Arne, Affre, Laurence (1969-), Dutoit, Thierry (1967-), Poschlod, Peter 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
Consultable
Article (2011)URL
Titre : Plant traits and population characteristics predict extinctions in a long‑term survey of Mediterranean annual plants Type de document : Numérique 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 : [CBNPMP-Thématique] Malherbologie
[CBNPMP-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 : DOI : 10.1007/s10531-018-1551-9 / HAL : hal-01915740
Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=144367
in Biodiversity and conservation > 27 (2018) . - 2527-2540Saatkamp, Arne, Affre, Laurence (1969-), Dutoit, Thierry (1967-), Poschlod, Peter 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
Consultable
Article (2018)URLPopulation size, plant performance, and genetic variation in the rare plant Arnica montana L. in the Rhön, Germany / Stefanie Kahmen (2000)
Titre : Population size, plant performance, and genetic variation in the rare plant Arnica montana L. in the Rhön, Germany Type de document : Tiré à part de revue Auteurs : Stefanie Kahmen ; Peter Poschlod Année de publication : 2000 Importance : 43-51 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Génétique et écologie (dynamique, démographique, sélection)
[CBNPMP-Thématique] Variabilité en protéines, polymorphisme enzymatique
[CBNPMP-Thématique] Variabilité morphologiqueMots-clés : Arnica montana L. Résumé : Phenotypic and genetic variation of the rare plant species Arnica montana L. were investigated in populations which had been fragmented by afforestation since 1930 in the Rhön, a mountain region in Central Germany. The aim of the study was to analyse whether small populations show less genetic variation and a lower fitness than large populations. Morphological and reproductive traits from eleven Arnica-populations of different size were examined in the field. Principal component analysis (PCA) reduced the nine traits measured to two main components, one of which correlated with phenotypic traits of the maternal plants in the field while the other corresponded to traits associated with offspring production, weight and germinability. The latter component, which we considered to be fitness-related, was significantly positively correlated with population size. We screened four isozymes to study the genetic variation of the populations. The mean number of alleles per locus (A), the mean observed heterozygosity (Ho), and the mean expected heterozygosity (He) were used to measure genetic variation. Population size and genetic variation were not significantly correlated. In addition, there were no significant correlations between the two main components of the PCA and genetic variation when controlling for population size. The results of the study suggest that small populations of plants exhibit a reduced reproductive success which could not be attributed to genetic erosion. It might be attributed to the longevity of the clonal A. montana that the genetic structure of the populations examined has remained unaffected by the habitat fragmentation so far. In addition, gene flow has probably still been taking place between the fragmented populations. Possibly, the reduced reproductive success of plants in the small populations was caused by missing availability of cross-compatible pollen because of a reduced set of S-alleles due to genetic drift. Furthermore, environmental maternal effects may have played an important role in reproduction and germinability. Identifiant : DOI : 10.1078/1439-1791-00007 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=130696 Kahmen, Stefanie, Poschlod, Peter 2000 Population size, plant performance, and genetic variation in the rare plant Arnica montana L. in the Rhön, Germany. Basic and applied ecology, 1 : 43-51.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 10864 K Tiré à part Centre de documentation Tirés à part Consultable
Titre : Rôles des ovins dans le transport de graines d'espèces messicoles : le cas d'une exploitation agricole du Parc naturel régional du Luberon Type de document : Imprimé Auteurs : Thierry Dutoit (1967-) ; Matthias Jagër ; Eric Gerbaud (1974-) ; Peter Poschlod Année de publication : 2003 Article en page(s) : 68-75 Langues : Français (fre) Catégories : [CBNPMP-Thématique] Messicole
[CBNPMP-Thématique] GerminationRésumé : Les expérimentations conduites sur le rôle des ovins dans le transport des graines via leur laine ou leur tractus digestif montrent que la richesse en plantes messicoles n'est pas assurée par les ovins (production de graines antérieure au pâturage, hauteur de moisson trop basse) mais plutôt par les pratiques agricoles elles-mêmes (absence de traitements herbicides et semis de la récolte précédente non triée). Ces pratiques permettent en outre des échanges de graines entre les parcelles de l'exploitation et le maintien des communautés de messicoles. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=149845
in Courrier scientifique du Parc naturel régional du Lubéron > 7 (2003) . - 68-75Dutoit, Thierry (1967-), Jagër, Matthias, Gerbaud, Eric (1974-), Poschlod, Peter 2003 Rôles des ovins dans le transport de graines d'espèces messicoles : le cas d'une exploitation agricole du Parc naturel régional du Luberon. Courrier scientifique du Parc naturel régional du Lubéron, 7: 68-75.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité R2639 COU Revue Centre de documentation Revues Consultable Documents numériques
Consultable
Article (2003)Adobe Acrobat PDF
Titre : Seed size, shape and vertical distribution in the soil : indicators of seed longevity Type de document : Tiré à part de revue Auteurs : Renée Marlies Bekker (1967-) ; Jan Pouwel Bakker ; U Grandin ; R. Kalamees ; Per Milberg ; Peter Poschlod ; Ken Thompson (1954-) ; J.H. Willems Année de publication : 1998 Importance : 834-842 Langues : Anglais (eng) Résumé : 1.We investigated the vertical distribution of seeds in the soil, using data from ninestudies in five European countries. We discovered significant correlations betweenseed shape and distribution in the soil.2.The classification of the longevity of seeds of plant species has been improved bythe introduction of a ‘longevity index’, expressing on a continuous scale the mostrecent information on seed longevity represented as the proportion of non-transientseed bank records in the database of Thompson et al. (1997). Remarkably, no differ-ence in seed longevity was found if the index was based on direct observations onlywhen compared with the index based on the complete data set where indirect, ‘depth-derived’ observations were included.3.Seed longevity was best estimated using a multiple regression model with anintegrated measure of seed size and shape and depth distribution of seeds.4.The shape of seeds, known to be a consistent character of species, was shown to beconstant within species, whereas depth distribution of seeds was highly variableamong sites. This is consistent with the variability of seed longevity found in publishedseed bank data. Identifiant : DOI : 10.1046/j.1365-2435.1998.00252.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=134191 Bekker, Renée Marlies (1967-), Bakker, Jan Pouwel, Grandin, U, Kalamees, R., Milberg, Per, Poschlod, Peter, Thompson, Ken (1954-), Willems, J.H. 1998 Seed size, shape and vertical distribution in the soil : indicators of seed longevity. Functional Ecology, 12(4) : 834-842.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22012 B Tiré à part Centre de documentation Tirés à part Consultable Documents numériques
Article (1998)URL
Titre : Status and future of seed conservation of threatened plants in the post-2020 era Type de document : Numérique Auteurs : Andreas Ensslin ; Adelaide Clemente ; Liu Udayangani ; Elke Zippel ; Carla Pinto-Cruz ; Carolina Sanchez Romero ; Simone Schneider ; Augustí Agut ; Charlotte Allender ; Külli Annama ; Marina Antic ; Bertille Asset ; Gianluigi Bacchetta ; Oz Baranzani ; Anamaria Barata ; Philippe Bardin ; Joze Bavcon ; Anabela D. F. Belo ; Marina Belovarska ; Karim Benkhelifa ; Christian Berg ; Karl-Georg Bernhardt ; Marcin Beza ; Kristina Bjureke ; Sina Bohm ; Peter Borgmann ; Josep Borrell ; Stéphane Buord ; Jocelyne Cambecèdes ; Francesca Carruggio ; Angelino Carta ; Pedro Casimiro ; Ted Chapman ; Iveta Cicova ; Régis Crisnaire ; Antonia Cristaudo ; Lucia De la Rosa ; Maîte Delmas ; Gergana Desheva ; Valter Di Cecco ; Luciano Di Martino ; Katia Diadema (1980-) ; Lara Dixon ; Denise Dostatny ; Marie Duval ; Roland K. Eberwein ; Mikel Etxeberria Okariz ; Caroline Favier ; Nick Fenby ; Mariana P. Fernandes ; Immaculada Ferrando-Pardo ; Pablo Ferrer ; Noémie Fort ; Luigi Forte ; Catia F. Freitas ; Agnese Gailite ; Katarzyna Galej-Ciwis ; Rosa Maria Garcia ; Ana Irene García del Bao ; Catherine Gautier ; Bronislovas Gelvonauskis ; Gian Petro Guisso del Galdo ; Miguel Angel González-Pérez ; Johan Gourvil ; Luisa Gouveia ; Thierry Helminger ; Brais Hermosilla Lorenzo ; Laetitia Hugot ; Marko Hyvärinen ; Ignac Janzekovic ; Andreas König ; Nikos Krigas ; Emilio Laguna ; Ludivine Lapebie ; Denis Larpin ; Maja Lazarević ; Dikla Lifshitz ; Vincent Lipa ; Carlos Lobo ; Ulrike Lohwasser ; Sandrine Loriot ; Sara Magrini ; Francesca Mantino ; Mauro Mariotti ; Evi Matiatou ; Lubomir Mendel ; Marine Millet ; Mari Miranto ; Andréa Mondoni ; Santiago Moreno Vásquez ; Valeria Negri ; Peter Nick ; Maciej Niemczyk ; Humberto Nobrega ; Pawel Olejniczak ; Małgorzata Pałucka ; Katerina Papanastasi ; Ioanna Papanikolaou ; Miguel A. A. Pinheiro de Carvalho ; Marco Porceddu ; Sotirios Porevis ; Peter Poschlod ; Lorenzo Raggi ; Sarmite Rancane ; Leonid Rasran ; Blanka Ravnjak ; Stéphane Rivière (1972-) ; Axelle Roumier ; Anna Rucinska ; Félix Schlatti ; Marco Schmidt ; Guy Seznec ; Manuela Sim-Sim ; Ana Luisa Soares ; Nora Stoeckl ; Silvia Strajeru ; Gitana Stukeniene ; Andrej Susek ; Andreas Titze ; Sarah Trinder ; Zlatina Tsvetanova ; Théo Van Hintum ; Nils (van) Rooijen ; Magdalena Vicens ; Mariacristina Villani ; Silvia Villegas ; Fiona J. White ; Sabine Zachago ; Elena Zappa ; Vince Zsigmond ; Sandrine Godefroid Année de publication : 2026 Article en page(s) : 1-15 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Conservation et gestion des espèces
[CBNPMP-Thématique] SemencesRésumé : Societal Impact Statement
Ambitious targets have been set to backup seeds of threatened plants by the global strategy for plant conservation (GSPC), but it is unclear in how far these targets have been met and how seed collection should be organized to meet future challenges. Here, we provide an overview of the status of 44 countries in achieving seed conservation targets. We show that progress varies strongly across countries, but in general, targets of the 2011–2020 GSCP have not been reached. By a regional example, we illustrate how seed collection could be organized to safeguard our threatened flora.
Summary
Seed banking of wild plants is a central pillar of conservation strategies for threatened plants. Target 8 of the Global Strategy for Plant Conservation (GSPC) called for at least 75% of threatened plant species to be conserved ex situ by 2020, but to what extent countries have achieved this target is unclear. Consequently, it is unknown how seed banking should be organized in future to safeguard plant diversity and support the increasing demand for seeds for habitat restoration.
We conducted a comprehensive survey across 44 countries in Europe and western Asia and collected information on seed bank stocks of native taxa. We harmonized the taxonomic names across the collections and matched them against a database of national plant Red Lists to assign each taxon its IUCN (International Union for Conservation of Nature) threat status in its country of origin. We analysed each country's achievement in terms of the conservation of its threatened flora and evaluated the quality of the collections in terms of genetic representativeness and seed quantity.
We found that none of the studied countries had reached Target 8 of the GSPC by 2020. While a few countries had come close to it, on average only 21% of threatened taxa were conserved across countries.
Our results demonstrate that the current seed conservation strategy has not met conservation demands. Using an example from Belgium, where considerable progress has been achieved by investing in a network of volunteer seed collectors, we show how future seed collection could be organized in collaborative community-based approaches.
Identifiant : DOI : 10.1002/ppp3.70177 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=155992
in Plants, People, Planet > (2026) . - 1-15Ensslin, Andreas, Clemente, Adelaide, Udayangani, Liu, Zippel, Elke, Pinto-Cruz, Carla, Sanchez Romero, Carolina, Schneider, Simone, Agut, Augustí, Allender, Charlotte, Annama, Külli, Antic, Marina, Asset, Bertille, Bacchetta, Gianluigi, Baranzani, Oz, Barata, Anamaria, Bardin, Philippe, Bavcon, Joze, Belo, Anabela D. F., Belovarska, Marina, Benkhelifa, Karim, Berg, Christian, Bernhardt, Karl-Georg, Beza, Marcin, Bjureke, Kristina, Bohm, Sina, Borgmann, Peter, Borrell, Josep, Buord, Stéphane, Cambecèdes, Jocelyne, Carruggio, Francesca, Carta, Angelino, Casimiro, Pedro, Chapman, Ted, Cicova, Iveta, Crisnaire, Régis, Cristaudo, Antonia, De la Rosa, Lucia, Delmas, Maîte, Desheva, Gergana, Di Cecco, Valter, Di Martino, Luciano, Diadema, Katia (1980-), Dixon, Lara, Dostatny, Denise, Duval, Marie, Eberwein, Roland K., Etxeberria Okariz, Mikel, Favier, Caroline, Fenby, Nick, Fernandes, Mariana P., Ferrando-Pardo, Immaculada, Ferrer, Pablo, Fort, Noémie, Forte, Luigi, Freitas, Catia F., Gailite, Agnese, Galej-Ciwis, Katarzyna, Garcia, Rosa Maria, García del Bao, Ana Irene, Gautier, Catherine, Gelvonauskis, Bronislovas, Guisso del Galdo, Gian Petro, González-Pérez, Miguel Angel, Gourvil, Johan, Gouveia, Luisa, Helminger, Thierry, Hermosilla Lorenzo, Brais, Hugot, Laetitia, Hyvärinen, Marko, Janzekovic, Ignac, König, Andreas, Krigas, Nikos, Laguna, Emilio, Lapebie, Ludivine, Larpin, Denis, Lazarević, Maja, Lifshitz, Dikla, Lipa, Vincent, Lobo, Carlos, Lohwasser, Ulrike, Loriot, Sandrine, Magrini, Sara, Mantino, Francesca, Mariotti, Mauro, Matiatou, Evi, Mendel, Lubomir, Millet, Marine, Miranto, Mari, Mondoni, Andréa, Moreno Vásquez, Santiago, Negri, Valeria, Nick, Peter, Niemczyk, Maciej, Nobrega, Humberto, Olejniczak, Pawel, Pałucka, Małgorzata, Papanastasi, Katerina, Papanikolaou, Ioanna, Pinheiro de Carvalho, Miguel A. A., Porceddu, Marco, Porevis, Sotirios, Poschlod, Peter, Raggi, Lorenzo, Rancane, Sarmite, Rasran, Leonid, Ravnjak, Blanka, Rivière, Stéphane (1972-), Roumier, Axelle, Rucinska, Anna, Schlatti, Félix, Schmidt, Marco, Seznec, Guy, Sim-Sim, Manuela, Soares, Ana Luisa, Stoeckl, Nora, Strajeru, Silvia, Stukeniene, Gitana, Susek, Andrej, Titze, Andreas, Trinder, Sarah, Tsvetanova, Zlatina, Van Hintum, Théo, Rooijen, Nils (van), Vicens, Magdalena, Villani, Mariacristina, Villegas, Silvia, White, Fiona J., Zachago, Sabine, Zappa, Elena, Zsigmond, Vince, Godefroid, Sandrine 2026 Status and future of seed conservation of threatened plants in the post-2020 era. Plants, People, Planet: 1-15.Documents numériques
article (2026)URL
Titre : The seed bank longevity index revisited : limited reliability evident from a burial experiment and database analyses Type de document : Numérique Auteurs : Arne Saatkamp ; Laurence Affre (1969-) ; Thierry Dutoit (1967-) ; Peter Poschlod Année de publication : 2009 Article en page(s) : 715-724 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Banque de semences dans le sol
[CBNPMP-Thématique] Longévité des semences
[CBNPMP-Thématique] MessicoleMots-clés : Bifora testiculata Carthamus lanatus Centaurea solstitialis L. Résumé : Seed survival in the soil contributes to population persistence and community diversity, creating a need for reliable measures of soil seed bank persistence. Several methods estimate soil seed bank persistence, most of which count seedlings emerging from soil samples. Seasonality, depth distribution and presence (or absence) in vegetation are then used to classify a species' soil seed bank into persistent or transient, often synthesized into a longevity index. This study aims to determine if counts of seedlings from soil samples yield reliable seed bank persistence estimates and if this is correlated to seed production. Seeds of 38 annual weeds taken from arable fields were buried in the field and their viability tested by germination and tetrazolium tests at 6 month intervals for 2·5 years. This direct measure of soil seed survival was compared with indirect estimates from the literature, which use seedling emergence from soil samples to determine seed bank persistence. Published databases were used to explore the generality of the influence of reproductive capacity on seed bank persistence estimates from seedling emergence data. There was no relationship between a species' soil seed survival in the burial experiment and its seed bank persistence estimate from published data using seedling emergence from soil samples. The analysis of complementary data from published databases revealed that while seed bank persistence estimates based on seedling emergence from soil samples are generally correlated with seed production, estimates of seed banks from burial experiments are not. The results can be explained in terms of the seed size–seed number trade-off, which suggests that the higher number of smaller seeds is compensated after germination. Soil seed bank persistence estimates correlated to seed production are therefore not useful for studies on population persistence or community diversity. Confusion of soil seed survival and seed production can be avoided by separate use of soil seed abundance and experimental soil seed survival. Identifiant : DOI : 10.1093/aob/mcp148 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=141291
in Annals of Botany > 104 (4) (2009) . - 715-724Saatkamp, Arne, Affre, Laurence (1969-), Dutoit, Thierry (1967-), Poschlod, Peter 2009 The seed bank longevity index revisited : limited reliability evident from a burial experiment and database analyses. Annals of Botany, 104(4): 715-724.
