{"id":55725,"date":"2026-06-18T11:12:49","date_gmt":"2026-06-18T15:12:49","guid":{"rendered":"https:\/\/www.uqac.ca\/uqactualites\/?p=55725"},"modified":"2026-06-23T13:21:53","modified_gmt":"2026-06-23T17:21:53","slug":"deux-finalistes-de-luqac-au-concours-la-preuve-par-limage-2026","status":"publish","type":"post","link":"https:\/\/www.uqac.ca\/uqactualites\/2026\/06\/18\/deux-finalistes-de-luqac-au-concours-la-preuve-par-limage-2026\/","title":{"rendered":"Deux finalistes de l&rsquo;UQAC au concours La preuve par l&rsquo;image 2026"},"content":{"rendered":"<p>Deux membres de la communaut\u00e9 universitaire figurent parmi les finalistes de l&rsquo;\u00e9dition 2026 du concours de photo scientifique <a href=\"https:\/\/www.acfas.ca\/prix-concours\/preuve-image\/laureats\"><em>La preuve par l&rsquo;image<\/em><\/a>, pr\u00e9sent\u00e9 par l&rsquo;Acfas en collaboration avec le Conseil de recherches en sciences naturelles et en g\u00e9nie du Canada (CRSNG).<\/p>\n<p>Ce prestigieux concours pancanadien met en vedette des images issues de la recherche scientifique en milieu francophone. Son objectif est de promouvoir la recherche d\u2019ici et de stimuler la curiosit\u00e9 scientifique du public en donnant une visibilit\u00e9 \u00e0 des \u0153uvres visuelles tir\u00e9es de projets scientifiques.<\/p>\n<p>Juliette Ricaud, \u00e9tudiante au doctorat en biologie et membre de la <a href=\"https:\/\/www.creae-uqac.ca\/\">Chaire de recherche sur les esp\u00e8ces aquatiques exploit\u00e9es (CREAE)<\/a>, est la cr\u00e9atrice derri\u00e8re l&rsquo;une des 20 images retenues cette ann\u00e9e. Intitul\u00e9e <em>Menu d&rsquo;hiver<\/em>, sa photo, obtenue par microscopie optique, montre un groupe de cop\u00e9podes, \u00e9chantillonn\u00e9s \u00e0 la baie des Ha! Ha! dans le cadre de son projet doctoral.<\/p>\n<p>Sous la codirection de <a href=\"https:\/\/portfolio.uqac.ca\/pascalsirois\/\" target=\"_blank\" rel=\"noopener\">Pascal Sirois<\/a> (UQAC), d&rsquo;<a href=\"https:\/\/portfolio.uqac.ca\/oliviermorissette\/\" target=\"_blank\" rel=\"noopener\">Olivier Morissette<\/a> (UQAC) et de Gesche Winkler (UQAR), la recherche de Juliette Ricaud porte sur les r\u00e9seaux trophiques et sur l&rsquo;alimentation des principales esp\u00e8ces de poissons qui font l&rsquo;objet d&rsquo;une p\u00eache r\u00e9cr\u00e9ative dans le fjord du Saguenay. L&rsquo;\u00e9tudiante cherche ainsi \u00e0 mieux comprendre les relations entre les diff\u00e9rentes cha\u00eenes alimentaires pr\u00e9sentes dans l&rsquo;\u00e9cosyst\u00e8me, un sujet jusqu&rsquo;alors tr\u00e8s peu \u00e9tudi\u00e9 dans ce territoire maritime, dont la compr\u00e9hension est essentielle pour assurer la stabilit\u00e9 des esp\u00e8ces aquatiques qui y sont exploit\u00e9es. Les petits crustac\u00e9s repr\u00e9sent\u00e9s sur la photo constituent un \u00e9l\u00e9ment important de l&rsquo;une de ces cha\u00eenes alimentaires, puisqu&rsquo;ils sont l&rsquo;une des proies principales de l&rsquo;\u00e9perlan arc-en-ciel.<\/p>\n<p>Marie-Jo\u00eblle Lauzier, professionnelle de recherche au <a href=\"https:\/\/recherche.uqac.ca\/lerga\/\" target=\"_blank\" rel=\"noopener\">Laboratoire d&rsquo;expertise et de recherche en g\u00e9ographie appliqu\u00e9es (LERGA)<\/a>, a \u00e9galement soumis une image s\u00e9lectionn\u00e9e pour le concours. Intitul\u00e9e <em>La d\u00e9rive des s\u00e9diments<\/em>, cette prise de vue de la rivi\u00e8re Nicolet, obtenue \u00e0 l&rsquo;aide d&rsquo;une technologie de t\u00e9l\u00e9d\u00e9tection par laser, a \u00e9t\u00e9 r\u00e9alis\u00e9e dans le cadre d\u2019un projet de recherche visant \u00e0 int\u00e9grer l\u2019indice de connectivit\u00e9 s\u00e9dimentaire dans l\u2019\u00e9valuation de l\u2019\u00e9tat de sant\u00e9 des cours d\u2019eau agricoles du Qu\u00e9bec.<\/p>\n<p>Cet indice, d\u00e9termin\u00e9 par les diff\u00e9rentes couches de couleurs observables sur l&rsquo;image, permet d&rsquo;identifier la probabilit\u00e9 que les s\u00e9diments \u00e9rod\u00e9s sur le territoire atteignent le r\u00e9seau hydrographique. Avec l&rsquo;objectif d&rsquo;adapter cet indice au contexte agro-forestier qu\u00e9b\u00e9cois, l&rsquo;\u00e9quipe du LERGA d\u00e9veloppe un outil suppl\u00e9mentaire pour mieux repr\u00e9senter l\u2019influence des terres cultiv\u00e9es et des perturbations foresti\u00e8res sur le transport s\u00e9dimentaire potentiel d\u2019un bassin versant.<\/p>\n<hr \/>\n<h4 style=\"text-align: center;\">D\u00e9couvrez les projets photo des deux finalistes<\/h4>\n<p style=\"text-align: center;\"><em><strong>Menu d&rsquo;hiver<\/strong><br \/>\n<\/em>Par Juliette Ricaud<\/p>\n<figure id=\"attachment_55790\" aria-describedby=\"caption-attachment-55790\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-55790\" src=\"https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/28_ricaud_aquatique_rvb.jpg-1-300x200.png\" alt=\"\" width=\"500\" height=\"333\" srcset=\"https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/28_ricaud_aquatique_rvb.jpg-1-300x200.png 300w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/28_ricaud_aquatique_rvb.jpg-1-1024x683.png 1024w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/28_ricaud_aquatique_rvb.jpg-1-768x512.png 768w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/28_ricaud_aquatique_rvb.jpg-1-150x100.png 150w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/28_ricaud_aquatique_rvb.jpg-1-696x464.png 696w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/28_ricaud_aquatique_rvb.jpg-1-1068x712.png 1068w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/28_ricaud_aquatique_rvb.jpg-1.png 1536w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><figcaption id=\"caption-attachment-55790\" class=\"wp-caption-text\">\u00abCes minuscules et innombrables crustac\u00e9s, des cop\u00e9podes, sont \u00e0 peine visibles \u00e0 l\u2019\u0153il nu. De tailles diverses selon l\u2019esp\u00e8ce, certains se nourrissent d\u2019algues, d\u2019autres de d\u00e9tritus ou de cop\u00e9podes plus petits. Toutefois, ils ont en commun d\u2019\u00eatre tr\u00e8s riches en prot\u00e9ines et en lipides. Dans le fjord du Saguenay, l\u2019hiver, lorsque le couvert de glace se referme, ils repr\u00e9sentent une grande partie du garde-manger des petits poissons, tels les \u00e9perlans arc-en-ciel, qui servent eux-m\u00eames de repas aux morues et aux fl\u00e9tans. Les cop\u00e9podes forment ainsi un maillon essentiel de cette cha\u00eene alimentaire. Au grand plaisir, d\u2019ailleurs, des amateurs de p\u00eache blanche\u2026\u00bb<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><strong><em>La d\u00e9rive des s\u00e9diments<br \/>\n<\/em><\/strong>Par Marie-Jo\u00eblle Lauzier<\/p>\n<figure id=\"attachment_55800\" aria-describedby=\"caption-attachment-55800\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-55800\" src=\"https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/41_lauzier_sediments_rvb.jpg-1-300x232.png\" alt=\"\" width=\"500\" height=\"386\" srcset=\"https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/41_lauzier_sediments_rvb.jpg-1-300x232.png 300w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/41_lauzier_sediments_rvb.jpg-1-1024x791.png 1024w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/41_lauzier_sediments_rvb.jpg-1-768x593.png 768w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/41_lauzier_sediments_rvb.jpg-1-1536x1187.png 1536w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/41_lauzier_sediments_rvb.jpg-1-2048x1583.png 2048w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/41_lauzier_sediments_rvb.jpg-1-150x116.png 150w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/41_lauzier_sediments_rvb.jpg-1-696x538.png 696w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/41_lauzier_sediments_rvb.jpg-1-1068x825.png 1068w, https:\/\/www.uqac.ca\/uqactualites\/wp-content\/uploads\/2026\/06\/41_lauzier_sediments_rvb.jpg-1-1920x1484.png 1920w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><figcaption id=\"caption-attachment-55800\" class=\"wp-caption-text\">\u00abVoici une partie du bassin versant de la rivi\u00e8re Nicolet, non loin de sa source situ\u00e9e dans les Appalaches (\u00e0 droite). Cette image a \u00e9t\u00e9 obtenue par un LiDAR, qui utilise des impulsions laser pour cartographier les reliefs. Par-dessus, une couche de couleurs traduit l&rsquo;indice de connectivit\u00e9 hydros\u00e9dimentaire : la probabilit\u00e9 que des s\u00e9diments soient transport\u00e9s par l\u2019\u00e9coulement des eaux, en fonction de la pente et de la pr\u00e9sence de couvert forestier, jusqu\u2019\u00e0 la rivi\u00e8re Nicolet et ses affluents. Plus les couleurs tirent sur le rouge, plus les s\u00e9diments risquent de se d\u00e9placer vers l\u2019aval. Voil\u00e0 un outil suppl\u00e9mentaire pour mieux planifier l\u2019occupation du territoire.\u00bb<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><a href=\"https:\/\/ici.radio-canada.ca\/concours\/la-preuve-par-l-image\/2026\/\" target=\"_blank\" rel=\"noopener\"><strong>Encouragez les deux repr\u00e9sentantes de l&rsquo;UQAC en votant pour le prix du public <em>D\u00e9couverte!<\/em><\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Deux membres de la communaut\u00e9 universitaire figurent parmi les finalistes de l&rsquo;\u00e9dition 2026 du concours de photo scientifique La preuve par l&rsquo;image, pr\u00e9sent\u00e9 par l&rsquo;Acfas en collaboration avec le Conseil de recherches en sciences naturelles et en g\u00e9nie du Canada (CRSNG). Ce prestigieux concours pancanadien met en vedette des images issues de la recherche scientifique [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":55729,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2795,2,4],"tags":[2890,3,22,64],"class_list":["post-55725","post","type-post","status-publish","format-standard","has-post-thumbnail","category-alaune","category-actualites","category-recherche-creation","tag-creae","tag-dsf","tag-dshs","tag-lerga"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\r\n<title>Deux finalistes de l&#039;UQAC au concours La preuve par l&#039;image 2026 - UQACtualit\u00e9s<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.uqac.ca\/uqactualites\/2026\/06\/18\/deux-finalistes-de-luqac-au-concours-la-preuve-par-limage-2026\/\" \/>\r\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Deux finalistes de l&#039;UQAC au concours La preuve par l&#039;image 2026 - UQACtualit\u00e9s\" \/>\r\n<meta property=\"og:description\" content=\"Deux membres de la communaut\u00e9 universitaire figurent parmi les finalistes de l&rsquo;\u00e9dition 2026 du concours de photo scientifique La preuve par l&rsquo;image, pr\u00e9sent\u00e9 par l&rsquo;Acfas en collaboration avec le Conseil de recherches en sciences naturelles et en g\u00e9nie du Canada (CRSNG). 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