{"id":11595,"date":"2020-11-10T09:01:49","date_gmt":"2020-11-10T09:01:49","guid":{"rendered":"https:\/\/www.northafricatrees.org\/genus\/acacia-mill\/"},"modified":"2021-09-04T15:03:18","modified_gmt":"2021-09-04T15:03:18","slug":"acacia-mill","status":"publish","type":"genus","link":"https:\/\/www.northafricatrees.org\/fr\/genres\/acacia-mill\/","title":{"rendered":"Acacia Mill."},"content":{"rendered":"<p>Traditionnellement, le genre r\u00e9unissait environ 1500 esp\u00e8ces \u00e0 l&rsquo;\u00e9chelle mondiale, et peut donc \u00eatre consid\u00e9r\u00e9 comme l&rsquo;un des plus diversifi\u00e9s de la famille. Cependant, les donn\u00e9es de phylog\u00e9nie obtenues \u00e0 partir de marqueurs mol\u00e9culaires ont permis d&rsquo;identifier plusieurs lign\u00e9es, ce qui a rendu souhaitable de proc\u00e9der \u00e0 une nouvelle circonscription du genre, aboutissant \u00e0 la reconnaissance de 5 genres ind\u00e9pendants : <em>Acacia <\/em>Mill<em>.<\/em>, <em>Senegalia<\/em> Raf., <em>Vachellia<\/em> Wight &amp; Arn., <em>Mariosousa <\/em>Seigler &amp; Ebinger et <em>Acaciella <\/em>Britton &amp; Rose. Cette s\u00e9paration, \u00e9tablie en 2011 sur la base d\u2019accords conclus au cours du Congr\u00e8s international de botanique de Melbourne (faisant suite \u00e0 une proposition pr\u00e9sent\u00e9e lors du Congr\u00e8s international de botanique c\u00e9l\u00e9br\u00e9 \u00e0 Vienne en 2005), s&rsquo;appuie sur une nouvelle typification du genre : son esp\u00e8ce type, <em>Acacia scorpioides <\/em>(L.) W.Wight [<em>A. nilotica <\/em>(L.) Willd. ex Del.], appartenant \u00e0 une lign\u00e9e minoritaire, a \u00e9t\u00e9 remplac\u00e9e par un nouveau type (<em>A.<\/em> <em>penninervis <\/em>Sieber ex DC.) afin de maintenir une stabilit\u00e9 optimale de la nomenclature. De cette mani\u00e8re, le genre <em>Acacia<\/em> est encore celui qui r\u00e9unit le plus grand nombre d\u2019esp\u00e8ces (environ 1075), la plupart confin\u00e9es en Australie (plus une dizaine d\u2019esp\u00e8ces asiatiques et deux de Madagascar), tandis que les autres se trouvent r\u00e9parties entre les autres genres cit\u00e9s.<\/p>\n<p>Dans le N. de l\u2019Afrique, toutes les esp\u00e8ces repr\u00e9sent\u00e9es sont allochtones, cultiv\u00e9es pour leur bois, la production de gommes et de tanins, en tant que fixateurs de dunes, pour leur valeur ornementale ou foresti\u00e8re, etc., certaines d\u2019entre elles pouvant appara\u00eetre comme adventices ou m\u00eame \u00eatre localement naturalis\u00e9es ou en voie de l\u2019\u00eatre.<\/p>\n<p>Le pr\u00e9sent projet est destin\u00e9 \u00e0 mettre en valeur la biodiversit\u00e9 du N. de l\u2019Afrique, tout en pr\u00e9tendant contribuer \u00e0 freiner l\u2019expansion des esp\u00e8ces exotiques, en particuliers les envahissantes, en r\u00e9ponse aux graves bouleversements qu\u2019elles engendrent dans les \u00e9cosyst\u00e8mes naturels et les syst\u00e8mes \u00e9conomiques locaux. Bien que nous ne cessons d\u2019insister sur le fait que le N. de l\u2019Afrique compte de nombreuses esp\u00e8ces susceptibles d\u2019assumer des fonctions similaires ou meilleures que les exotiques, une pr\u00e9sentation des acacias exotiques les plus commun\u00e9ment utilis\u00e9s est fournie ci-apr\u00e8s, et cela afin de faciliter leur identification, en vue par exemple de programmes visant \u00e0 leur \u00e9radication et \u00e0 leur substitution par d&rsquo;autres esp\u00e8ces indig\u00e8nes.<\/p>\n","protected":false},"template":"","short_name":"Acacia","name_html":"<strong>Acacia<\/strong> Mill.","short_description":"","references":"Maslin, B.R. <em>et al<\/em>. 2001. <em>Acacia<\/em>. <em>In<\/em>: A.E.Orchard &amp; A.J.G. Wilson (eds.). <em>Flora of Australia<\/em> vols. 11A &amp; 11B.","custom_author":"J.A. 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