Mon travail concernait les d\u00e9terminants biotiques et abiotiques de la structure des communaut\u00e9s de col\u00e9opt\u00e8res dans le domaine de la steppe du Nord de la Chine. Le site d\u2019\u00e9tude se trouve \u00e0 Yanchi, \u00e0 l\u2019est de la R\u00e9gion Autonome du Ningxia Hui. J’ai b\u00e9n\u00e9fici\u00e9 de la connaissance du terrain par mes coll\u00e8gues qui y font des suivis de populations dans cette zone depuis quelques ann\u00e9es. <\/p>\n\n\n\n
La zone d’\u00e9tude est un \u00e9cosyst\u00e8me steppique caract\u00e9ris\u00e9 par un climat froid et sec de type \u00ab\u00a0BSk\u00a0\u00bb avec une faible pluviom\u00e9trie (2-78mm) et des temp\u00e9ratures variant de -8\u00b0C en hiver (d\u00e9cembre) \u00e0 +22\u00b0C en \u00e9t\u00e9 (juillet).<\/p>\n\n\n\n Ces conditions ne permettent pas la croissance des arbres. La zone est ainsi caract\u00e9ris\u00e9e par une formation herbac\u00e9e et quelques rares arbustes. La v\u00e9g\u00e9tation est caract\u00e9ris\u00e9e par les esp\u00e8ces Stipa Spp<\/em> et Allium polyrhizum Turcz. ex Regel<\/em> dans les \u00e9cosyst\u00e8mes steppiques les plus chauds \u00ab desert steppe \u00bb et par les esp\u00e8ces Stipa sp, Festuca sp, Leymus sp<\/em> et Artemisia sp<\/em> dans les \u00e9cosyst\u00e8mes steppiques les moins arides de type \u00ab typical steppe \u00bb. Du fait de la fertilit\u00e9 \u00e9lev\u00e9e des sols de steppes, de plus en plus de terres sont converties en parcelles cultivables dans la zone d\u2019\u00e9tude. La pression de p\u00e2turage dans cette zone est en nette augmentation fragilisant encore plus l\u2019\u00e9cosyst\u00e8me.<\/p>\n\n\n\n La zone subit les effets conjoints du changement climatique et des activit\u00e9s humaines (surp\u00e2turage, cl\u00f4tures, couverture du sol par les panneaux photovolta\u00efques).Mon travail est divis\u00e9 en trois parties:<\/p>\n\n\n\n Les points (1) et (2) ont \u00e9t\u00e9 trait\u00e9s et on fait l’objet de 6 publications dans des revues \u00e0 comit\u00e9 de lecture . Le point (3) est encore en cours (exploitation des donn\u00e9es en cours, articles \u00e0 suivre) et fait l’objet d’un financement de la China Postdoctoral Fundation.<\/p>\n\n\n\n Local and landscape drivers of darkling beetles (Coleoptera:Tenebrionidae) in Yanchi county grasslands, Ningxia Hui Autonomous Region<\/em><\/p>\n\n\n\n The new geological age, Anthropocene is marked by the undeniable impact of human activities on ecosystems structure and functioning. Grassland ecosystems are one of the most altered in the world. Insects as well as all wildlife communities in grasslands undergo numerous pressures which impact and modify their habitats. Consequently, ecosystem services provided by insects like dwelling beetles are impeded. It is urgent to investigate factors impacting dwelling beetles to set up sustainable measures for their conservation. Darkling beetles (Coleoptera: Tenebrionidae) are one of the major orders of dwelling beetles observed in grassland ecosystems. Tenebrionids are mainly detritivores and essential in nutrient recycling. Some species are herbivorous feeding on plants leaves, reproductive organs or roots. They also serve as food for higher trophic level like birds. For these reasons, darkling beetles are of major interest for China grasslands. The goal of this research project is to determine the drivers of Tenebrionids species richness, activity-density and assemblages. We will investigate the effects of local and landscape factors on darkling beetles along a gradient of grazing intensity from north to south of Yanchi county in the Ningxia Hui Autonomous Region. The results of this study will improve our understanding of the dynamic, structure and functioning of darkling beetles communities along gradients of disturbances in grasslands. Finally, the study will give an insight into darkling beetle drivers for their conservation in grasslands.<\/em><\/p>\n\n\n\n Kang, L., Han, X., Zhang, Z., Sun, O.J., 2007. Grassland ecosystems in China: review of current knowledge and research advancement. Philosophical Transactions of the Royal Society B: Biological Sciences 362, 997\u20131008. https:\/\/doi.org\/10.1098\/rstb.2007.2029<\/p>\n","protected":false},"excerpt":{"rendered":" Structure des communaut\u00e9s de col\u00e9opt\u00e8res dans le domaine de Steppes du Nord de la Chine Mots cl\u00e9s : Grasslands \u2013 Disturbances \u2013 Cropland management \u2013 …<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/ntsafack.com\/index.php\/wp-json\/wp\/v2\/pages\/129"}],"collection":[{"href":"https:\/\/ntsafack.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ntsafack.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ntsafack.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ntsafack.com\/index.php\/wp-json\/wp\/v2\/comments?post=129"}],"version-history":[{"count":5,"href":"https:\/\/ntsafack.com\/index.php\/wp-json\/wp\/v2\/pages\/129\/revisions"}],"predecessor-version":[{"id":150,"href":"https:\/\/ntsafack.com\/index.php\/wp-json\/wp\/v2\/pages\/129\/revisions\/150"}],"wp:attachment":[{"href":"https:\/\/ntsafack.com\/index.php\/wp-json\/wp\/v2\/media?parent=129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"\/](\"https:\/\/1.bp.blogspot.com\/-Bh0dE7dfkJA\/WqoGfb_8muI\/AAAAAAAAAic\/Rjl3gbwIXgk3GG3wdVa5bFvyqP4Yh4MlwCLcBGAs\/s1600\/imagesteppe0.png\")
<\/a><\/figure>\n\n\n\n<\/a><\/figure>\n\n\n\n<\/a><\/figure>\n\n\n\nProject plan 2019:<\/h4>\n\n\n\n
<\/a><\/figure>\n\n\n\n<\/a><\/figure>\n\n\n\n<\/a><\/figure>\n\n\n\nR\u00e9f\u00e9rences bibliographiques<\/h4>\n\n\n\n