{"id":1518,"date":"2026-07-03T10:20:08","date_gmt":"2026-07-03T14:20:08","guid":{"rendered":"https:\/\/ogsl.enconstruction.website\/?post_type=tool&#038;p=1518"},"modified":"2026-10-19T14:00:16","modified_gmt":"2026-10-19T18:00:16","slug":"monitorage-des-algues-toxiques-alexandrium-catenella","status":"publish","type":"tool","link":"https:\/\/ogsl.enconstruction.website\/en\/tool\/monitorage-des-algues-toxiques-alexandrium-catenella\/","title":{"rendered":"Monitorage des algues toxiques Alexandrium catenella"},"content":{"rendered":"[vc_row type=\u00a0\u00bbin_container\u00a0\u00bb full_screen_row_position=\u00a0\u00bbmiddle\u00a0\u00bb column_margin=\u00a0\u00bbdefault\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb scene_position=\u00a0\u00bbcenter\u00a0\u00bb bottom_padding=\u00a0\u00bb20\u2033 text_color=\u00a0\u00bbdark\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_border_radius=\u00a0\u00bbnone\u00a0\u00bb row_border_radius_applies=\u00a0\u00bbbg\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3\u2033 gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb shape_divider_position=\u00a0\u00bbbottom\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb gradient_type=\u00a0\u00bbdefault\u00a0\u00bb shape_type=\u00a0\u00bb\u00a0\u00bb][vc_column column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1\u2033 background_hover_color_opacity=\u00a0\u00bb1\u2033 column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb column_position=\u00a0\u00bbdefault\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3\u2033 width=\u00a0\u00bb1\/1\u2033 tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]<h2>Pr\u00e9sentation de l\u2019application de pr\u00e9visions de floraison de l\u2019algues toxiques Alexandrium catenella dans le golfe et l\u2019estuaire du Saint-Laurent, c\u00f4te est canadienne<\/h2>\n<p>L\u2019application pr\u00e9sente les r\u00e9sultats du mod\u00e8le de pr\u00e9vision du risque de floraison de l\u2019algue toxique Alexandrium catenella. Les pr\u00e9visions sont mises \u00e0 jour toutes les six heures, et permettent de visualiser le risque de floraison pour les prochaines 48 heures.[\/vc_column_text][nectar_cta btn_style=\u00a0\u00bbbasic\u00a0\u00bb heading_tag=\u00a0\u00bbh5\u2033 button_color=\u00a0\u00bbextra-color-1\u2033 button_color_hover=\u00a0\u00bb#1E4659\u2033 text_color=\u00a0\u00bb#F9F8F6\u2033 text_color_hover=\u00a0\u00bb#F9F8F6\u2033 button_border_thickness=\u00a0\u00bb0px\u00a0\u00bb link_type=\u00a0\u00bbnew_tab\u00a0\u00bb alignment=\u00a0\u00bbleft\u00a0\u00bb alignment_tablet=\u00a0\u00bbdefault\u00a0\u00bb alignment_phone=\u00a0\u00bbdefault\u00a0\u00bb constrain_group_3=\u00a0\u00bbyes\u00a0\u00bb constrain_group_4=\u00a0\u00bbyes\u00a0\u00bb display=\u00a0\u00bbblock\u00a0\u00bb display_tablet=\u00a0\u00bbinherit\u00a0\u00bb display_phone=\u00a0\u00bbinherit\u00a0\u00bb icon_family=\u00a0\u00bbnone\u00a0\u00bb link_text=\u00a0\u00bbConsulter l\u2019application\u00a0\u00bb 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animation_movement_type=\u00a0\u00bbtransform_y\u00a0\u00bb hover_animation=\u00a0\u00bbnone\u00a0\u00bb alignment=\u00a0\u00bb\u00a0\u00bb border_radius=\u00a0\u00bb10px\u00a0\u00bb box_shadow=\u00a0\u00bbnone\u00a0\u00bb image_loading=\u00a0\u00bbdefault\u00a0\u00bb][\/vc_column][vc_column column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1\u2033 background_hover_color_opacity=\u00a0\u00bb1\u2033 column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb column_position=\u00a0\u00bbdefault\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3\u2033 width=\u00a0\u00bb1\/2\u2033 tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]<\/p><h3>Une algue toxique sous surveillance<\/h3>\n<p>La pr\u00e9sence sur la c\u00f4te canadienne d\u2019Alexandrium catenella est surveill\u00e9e depuis plus de 20 ans, car cette microalgue planctonique a la capacit\u00e9 de produire des neurotoxines (les saxitoxines). Lors des floraisons d\u2019A. catenella (ph\u00e9nom\u00e8ne durant lequel les algues se multiplient en tr\u00e8s grand nombre dans un lieu pr\u00e9cis), les mollusques filtreurs (p. ex. moules et p\u00e9toncles) consomment cette algue et concentrent dans leur chair les neurotoxines. Les consommateurs des mollusques contamin\u00e9s risquent alors l\u2019intoxication paralysante par les mollusques (IPM), qui entra\u00eenent des sympt\u00f4mes neurologiques chez de nombreuses esp\u00e8ces, incluant l\u2019homme. Les sympt\u00f4mes peuvent comprendre des maux de t\u00eates, des naus\u00e9es et des \u00e9tourdissements. Dans les cas les plus s\u00e9rieux, l\u2019intoxication peut entra\u00eener des troubles neuromusculaires graves (ataxie, paralysie).[\/vc_column_text][\/vc_column][\/vc_row][vc_row type=\u00a0\u00bbin_container\u00a0\u00bb full_screen_row_position=\u00a0\u00bbmiddle\u00a0\u00bb column_margin=\u00a0\u00bbdefault\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb scene_position=\u00a0\u00bbcenter\u00a0\u00bb top_padding=\u00a0\u00bb20\u2033 bottom_padding=\u00a0\u00bb20\u2033 text_color=\u00a0\u00bbdark\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_border_radius=\u00a0\u00bbnone\u00a0\u00bb row_border_radius_applies=\u00a0\u00bbbg\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3\u2033 gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb shape_divider_position=\u00a0\u00bbbottom\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb gradient_type=\u00a0\u00bbdefault\u00a0\u00bb shape_type=\u00a0\u00bb\u00a0\u00bb][vc_column column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1\u2033 background_hover_color_opacity=\u00a0\u00bb1\u2033 column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb column_position=\u00a0\u00bbdefault\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3\u2033 width=\u00a0\u00bb1\/1\u2033 tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]<\/p><h3>Des floraisons en augmentation<\/h3>\n<p>Les floraisons d\u2019algues toxiques peuvent entra\u00eener des cons\u00e9quences socio\u00e9conomiques importantes pour les r\u00e9gions touch\u00e9es. En effet, le risque accru de mortalit\u00e9 de pr\u00e9dateurs marins (Starr et al., 2017) ainsi que les fermetures pr\u00e9ventives de sites d\u2019\u00e9levage de coquillages peuvent affecter durement les populations humaines de ces r\u00e9gions. Or, la fr\u00e9quence et l\u2019\u00e9tendue g\u00e9ographique des algues toxiques semblent changer dans plusieurs r\u00e9gions du monde (Gobler, 2020). Les changements climatiques seraient une des causes de l\u2019augmentation per\u00e7ue, et plusieurs \u00e9tudes d\u00e9montrent que les algues toxiques sont sensibles aux pr\u00e9cipitations et au ruissellement, ainsi qu\u2019aux conditions oc\u00e9anographiques telles que la salinit\u00e9 et la temp\u00e9rature de l\u2019eau (Weise et al., 2002; Fauchot et al., 2005; Starr et al., 2017).<\/p>\n<h3>Un projet novateur<\/h3>\n<p>Dans ce contexte, un programme de recherche visant \u00e0 d\u00e9velopper des mod\u00e8les empiriques de pr\u00e9vision des floraisons d\u2019algues toxiques a vu le jour \u00e0 l\u2019Institut Maurice-Lamontagne (P\u00eaches et Oc\u00e9ans Canada), sous la supervision de Michel Starr (PhD), Jo\u00ebl Chass\u00e9 (PhD), Aude Boivin-Rioux (MSc) et Denis Lefaivre (PhD). Le premier r\u00e9sultat du programme est le mod\u00e8le de pr\u00e9vision du risque de floraison de l\u2019algue toxique Alexandrium catenella. Les pr\u00e9visions sont mises \u00e0 jour toutes les six heures, et permettent de visualiser le risque de floraison pour les prochaines 48 heures. Les r\u00e9sultats du mod\u00e8le peuvent \u00eatre visualis\u00e9s gr\u00e2ce \u00e0 l\u2019application. Les donn\u00e9es issues du premier mod\u00e8le canadien op\u00e9rationnel d\u2019Alexandrium sont ainsi rendues accessibles aux organismes de r\u00e9glementation gouvernementaux f\u00e9d\u00e9ral et provinciaux, aux industries aquacoles, ainsi qu\u2019aux municipalit\u00e9s et aux populations locales qui d\u00e9pendent principalement des ressources marines pour leur subsistance. Ces organisations b\u00e9n\u00e9ficient directement des r\u00e9sultats de ce projet en obtenant des informations compl\u00e8tes et des projections \u00e0 court terme n\u00e9cessaires \u00e0 l\u2019\u00e9laboration de strat\u00e9gies d\u2019adaptation qui minimisent les impacts socio-\u00e9conomiques d\u2019A. catenella. Cette approche pourrait \u00e9ventuellement \u00eatre \u00e9tendue \u00e0 d\u2019autres esp\u00e8ces toxiques (p. ex. Dinophysis) et \u00e0 d\u2019autres zones c\u00f4ti\u00e8res canadiennes gravement touch\u00e9es (p. ex. le d\u00e9troit de G\u00e9orgie) ou potentiellement touch\u00e9es (baie d\u2019Hudson, Arctique canadien) par les algues toxiques.[\/vc_column_text][\/vc_column][\/vc_row][vc_row type=\u00a0\u00bbin_container\u00a0\u00bb full_screen_row_position=\u00a0\u00bbmiddle\u00a0\u00bb column_margin=\u00a0\u00bbdefault\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb scene_position=\u00a0\u00bbcenter\u00a0\u00bb top_padding=\u00a0\u00bb20\u2033 bottom_padding=\u00a0\u00bb100\u2033 text_color=\u00a0\u00bbdark\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_border_radius=\u00a0\u00bbnone\u00a0\u00bb row_border_radius_applies=\u00a0\u00bbbg\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3\u2033 gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb shape_divider_position=\u00a0\u00bbbottom\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb gradient_type=\u00a0\u00bbdefault\u00a0\u00bb shape_type=\u00a0\u00bb\u00a0\u00bb][vc_column column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1\u2033 background_hover_color_opacity=\u00a0\u00bb1\u2033 column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb column_position=\u00a0\u00bbdefault\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3\u2033 width=\u00a0\u00bb1\/1\u2033 tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]<\/p><h3>Pour citer l\u2019application<\/h3>\n<p><em>St. Lawrence Global Observatory, Boivin-Rioux, A., Starr, M., Chass\u00e9, J., &amp; Lefaivre, D. (2022). Toxic Algae Alexandrium catenella Monitoring in Estuary and Gulf of Saint-Lawrence Web Application. Observatoire Global du Saint-Laurent.\u00a0<a href=\"https:\/\/doi.org\/10.26071\/OGSL-BW9A-0Y85\" target=\"_blank\" rel=\"noopener\">https:\/\/doi.org\/10.26071\/OGSL-BW9A-0Y85<\/a><\/em><\/p>\n<h4><b>Pour plus de d\u00e9tail<\/b>\u00a0sur la m\u00e9thodologie, rendez vous sur l\u2019application et dans la section m\u00e9thode de l\u2019article de Boivin-Rioux et al.\u00a0 (2021)\u00a0:\u00a0<a href=\"https:\/\/www.frontiersin.org\/articles\/10.3389\/fmars.2020.608021\/full\" target=\"_blank\" rel=\"noopener\"><b>https:\/\/www.frontiersin.org\/articles\/10.3389\/fmars.2020.608021\/full<\/b><\/a><\/h4>[\/vc_column_text][nectar_cta btn_style=\u00a0\u00bbbasic\u00a0\u00bb heading_tag=\u00a0\u00bbh5\u2033 button_color=\u00a0\u00bbextra-color-1\u2033 button_color_hover=\u00a0\u00bb#1E4659\u2033 text_color=\u00a0\u00bb#F9F8F6\u2033 text_color_hover=\u00a0\u00bb#F9F8F6\u2033 button_border_thickness=\u00a0\u00bb0px\u00a0\u00bb link_type=\u00a0\u00bbnew_tab\u00a0\u00bb alignment=\u00a0\u00bbleft\u00a0\u00bb alignment_tablet=\u00a0\u00bbdefault\u00a0\u00bb alignment_phone=\u00a0\u00bbdefault\u00a0\u00bb constrain_group_3=\u00a0\u00bbyes\u00a0\u00bb constrain_group_4=\u00a0\u00bbyes\u00a0\u00bb display=\u00a0\u00bbblock\u00a0\u00bb display_tablet=\u00a0\u00bbinherit\u00a0\u00bb display_phone=\u00a0\u00bbinherit\u00a0\u00bb icon_family=\u00a0\u00bbnone\u00a0\u00bb link_text=\u00a0\u00bbConsulter l\u2019application\u00a0\u00bb padding_top=\u00a0\u00bb22\u2033 padding_bottom=\u00a0\u00bb22\u2033 padding_left=\u00a0\u00bb32\u2033 padding_right=\u00a0\u00bb32\u2033 margin_top=\u00a0\u00bb60\u2033 url=\u00a0\u00bbhttps:\/\/algues-toxiques.ogsl.ca\/?_gl=1*1vr3hcw*_ga*NjIyNjkyOTA4LjE3NzU3NjE3Mjg.*_ga_HYC9KMDZVE*czE3ODMwODY3MDckbzI2JGcxJHQxNzgzMDg4MzcyJGo2MCRsMCRoMA..*_ga_B7XMBXNSYV*czE3ODMwODY3MDckbzI2JGcxJHQxNzgzMDg4MzcyJGo2MCRsMCRoMA..\u00a0\u00bb margin_bottom=\u00a0\u00bb100\u2033][\/vc_column][\/vc_row]","protected":false},"featured_media":1519,"template":"","meta":{"_acf_changed":false,"inline_featured_image":false},"etat":[],"type-doutil":[51],"class_list":["post-1518","tool","type-tool","status-publish","has-post-thumbnail","type-doutil-outils-de-visualisation"],"acf":[],"_links":{"self":[{"href":"https:\/\/ogsl.enconstruction.website\/en\/wp-json\/wp\/v2\/tool\/1518","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ogsl.enconstruction.website\/en\/wp-json\/wp\/v2\/tool"}],"about":[{"href":"https:\/\/ogsl.enconstruction.website\/en\/wp-json\/wp\/v2\/types\/tool"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ogsl.enconstruction.website\/en\/wp-json\/wp\/v2\/media\/1519"}],"wp:attachment":[{"href":"https:\/\/ogsl.enconstruction.website\/en\/wp-json\/wp\/v2\/media?parent=1518"}],"wp:term":[{"taxonomy":"etat","embeddable":true,"href":"https:\/\/ogsl.enconstruction.website\/en\/wp-json\/wp\/v2\/etat?post=1518"},{"taxonomy":"type-doutil","embeddable":true,"href":"https:\/\/ogsl.enconstruction.website\/en\/wp-json\/wp\/v2\/type-doutil?post=1518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}