{"id":852,"date":"2016-11-03T13:53:31","date_gmt":"2016-11-03T17:53:31","guid":{"rendered":"http:\/\/atlanticsalmon.wpengine.com\/?p=852"},"modified":"2016-11-03T13:53:31","modified_gmt":"2016-11-03T17:53:31","slug":"holyrood","status":"publish","type":"post","link":"https:\/\/www.salmonconservation.ca\/fr\/holyrood\/","title":{"rendered":"Holyrood"},"content":{"rendered":"<p>Tout le monde g\u00e8re le changement \u00e0 sa fa\u00e7on, et le saumon atlantique n\u2019agit pas diff\u00e9remment. Mais comment le comportement et la sant\u00e9 sont-ils affect\u00e9s par un changement majeur dans l\u2019environnement?<\/p>\n<p>La ville de Holyrood, \u00e0 Terre-Neuve, participe \u00e0 un projet de recherche afin de mieux comprendre comment le saumon atlantique s\u2019adapte aux changements \u00e0 long terme qui touchent l\u2019habitat.<\/p>\n<p>La Fondation pour la conservation du saumon atlantique a accord\u00e9 une somme de 19\u00a0220\u00a0$ pour ce projet dirig\u00e9 par Jim McCarthy, qui est candidat au PhD \u00e0 temps partiel \u00e0 l\u2019UNB.<\/p>\n<p>La ville appuie la recherche au Holy Cross Park (rivi\u00e8re Mahers) qui permet de convertir une section compl\u00e8te d\u2019un habitat en rivi\u00e8re en une grande fosse \u00e0 saumons pour des p\u00e9riodes prolong\u00e9es. De la recherche sera effectu\u00e9e avec diverses m\u00e9thodes innovatrices sur la r\u00e9action du saumon juv\u00e9nile \u00e0 ces fluctuations.<\/p>\n<p>\u00ab\u00a0Le projet comporte g\u00e9n\u00e9ralement l\u2019utilisation d\u2019un petit parc \u00e0 Holyrood o\u00f9 une fosse est cr\u00e9\u00e9e tous les \u00e9t\u00e9s en un laboratoire \u00ab naturel\u00a0\u00bb pour d\u00e9terminer comment les saumons juv\u00e9niles r\u00e9agissent aux changements rapides et permanents dans l\u2019habitat, souligne M. \u00a0McCarthy. La fosse qui est situ\u00e9e dans le parc fait en r\u00e9alit\u00e9 partie d\u2019un petit cours d\u2019eau o\u00f9 les saumons retournent chaque ann\u00e9e.\u00a0\u00bb<\/p>\n<p>\u00ab\u00a0Tous les \u00e9t\u00e9s, un petit barrage est ferm\u00e9 sur le cours d\u2019eau pour cr\u00e9er une fosse \u00e0 saumons dans une section du cours d\u2019eau en l\u2019espace de quelques heures. Le barrage reste g\u00e9n\u00e9ralement ferm\u00e9 jusqu\u2019au d\u00e9but de septembre. Il est alors ouvert et la fosse se vide rapidement et redevient un petit cours d\u2019eau. Les chercheurs peuvent facilement v\u00e9rifier comment les jeunes saumons r\u00e9agissent aux temp\u00eates qui surviennent sur une dur\u00e9e relativement courte, mais il est difficile de pr\u00e9dire les changements de cette ampleur \u00e0 long terme (toute une saison de croissance) dans l\u2019habitat.\u00a0\u00bb<\/p>\n<p>M.\u00a0McCarthy dit que son \u00e9quipe fait la collecte de donn\u00e9es sur les saumons juv\u00e9niles en utilisant plusieurs techniques comme des estimations de la population \u2013 la p\u00eache \u00e9lectrique \u2013 pour examiner les changements potentiels de la densit\u00e9 des poissons, et l\u2019\u00e9tiquetage des jeunes saumons avec des transpondeurs passifs int\u00e9gr\u00e9s.<\/p>\n<p>\u00ab\u00a0Gr\u00e2ce \u00e0 l\u2019\u00e9tiquetage avec des transpondeurs passifs int\u00e9gr\u00e9s, nous pouvons suivre les d\u00e9placements de chaque saumon au fur et \u00e0 mesure de son entr\u00e9e et de sa sortie de l\u2019habitat de la fosse. Nous avons aussi pr\u00e9lev\u00e9 des \u00e9chantillons des nageoires qui sont utilis\u00e9s dans des analyses stables de l\u2019isotope (carbone et azote) \u2013 cette technique peut nous indiquer si le poisson modifie ses habitudes alimentaires \u00e0 la suite de changements dans son habitat.\u00a0\u00bb<\/p>\n<p>\u00ab\u00a0Nous esp\u00e9rons que les donn\u00e9es recueillies sur les jeunes saumons qui habitent dans le cours d\u2019eau peuvent nous indiquer comment ils r\u00e9agissent aux changements dans l\u2019habitat qui peuvent \u00eatre li\u00e9s au d\u00e9veloppement humain comme les projets hydro-\u00e9lectriques. Nous pourrons par la suite utiliser cette information pour mettre au point de meilleures m\u00e9thodes d\u2019\u00e9valuation et d\u2019autres mesures de compensation plus efficaces.\u00a0\u00bb<\/p>\n<p>M.\u00a0McCarthy dit que le projet avance comme pr\u00e9vu, la collecte d\u2019une ann\u00e9e compl\u00e8te de donn\u00e9es d\u2019\u00e9tiquetage avec des transpondeurs passifs int\u00e9gr\u00e9s \u00e9tant presque termin\u00e9e.<\/p>\n<p>\u00ab\u00a0Nous avons aussi recueilli de l\u2019information avant (en juin) et apr\u00e8s (fin ao\u00fbt) la cr\u00e9ation de la fosse, et des \u00e9chantillons d\u2019isotope sont pr\u00eats \u00e0 \u00eatre exp\u00e9di\u00e9s au laboratoire. Nous avons \u00e9galement fait la collecte de donn\u00e9es environnementales comme les temp\u00e9ratures de l\u2019eau, les d\u00e9bits et les aliments (invert\u00e9br\u00e9s) durant l\u2019\u00e9t\u00e9.\u00a0\u00bb<\/p>","protected":false},"excerpt":{"rendered":"Tout le monde g\u00e8re le changement \u00e0 sa fa\u00e7on, et le saumon atlantique n\u2019agit pas diff\u00e9remment.","protected":false},"author":2,"featured_media":853,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[1],"tags":[],"class_list":["post-852","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - 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