{"id":25006,"date":"2022-02-11T18:56:04","date_gmt":"2022-02-11T17:56:04","guid":{"rendered":"https:\/\/fitopasion.com\/?p=25006"},"modified":"2022-02-11T18:57:07","modified_gmt":"2022-02-11T17:57:07","slug":"les-diatomees-surfeuses","status":"publish","type":"post","link":"https:\/\/fitopasion.com\/fr\/2022\/02\/les-diatomees-surfeuses.html","title":{"rendered":"Les diatom\u00e9es surfeuses"},"content":{"rendered":"\n<p class=\"has-text-align-right wp-block-paragraph\" style=\"font-size:12px\">Image de couverture: Plage Am\u00e9rica (Pontevedra). Auteur: F. Rodr\u00edguez<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><strong><em>Texte traduit par Marc Long<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bonjour \u00e0 tous ! Tout d&rsquo;abord, je voudrais annoncer que ce sera le dernier article pour un petit moment. Je n&rsquo;arr\u00eate pas le blog, mais je vais faire une pause. En attendant, j\u2019\u00e9crirai de nouveaux articles seulement lors d&rsquo;occasions sp\u00e9ciales.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-medium\"><a href=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2017\/09\/cropped-logo2.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2017\/09\/cropped-logo2-300x300.jpg\" alt=\"\" class=\"wp-image-7262\" srcset=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2017\/09\/cropped-logo2-300x300.jpg 300w, https:\/\/fitopasion.com\/wp-content\/uploads\/2017\/09\/cropped-logo2-80x80.jpg 80w, https:\/\/fitopasion.com\/wp-content\/uploads\/2017\/09\/cropped-logo2-36x36.jpg 36w, https:\/\/fitopasion.com\/wp-content\/uploads\/2017\/09\/cropped-logo2-180x180.jpg 180w, https:\/\/fitopasion.com\/wp-content\/uploads\/2017\/09\/cropped-logo2-120x120.jpg 120w, https:\/\/fitopasion.com\/wp-content\/uploads\/2017\/09\/cropped-logo2-450x450.jpg 450w, https:\/\/fitopasion.com\/wp-content\/uploads\/2017\/09\/cropped-logo2-150x150.jpg 150w, https:\/\/fitopasion.com\/wp-content\/uploads\/2017\/09\/cropped-logo2-270x270.jpg 270w, https:\/\/fitopasion.com\/wp-content\/uploads\/2017\/09\/cropped-logo2-192x192.jpg 192w, https:\/\/fitopasion.com\/wp-content\/uploads\/2017\/09\/cropped-logo2-32x32.jpg 32w, https:\/\/fitopasion.com\/wp-content\/uploads\/2017\/09\/cropped-logo2.jpg 512w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption>Le logo de Fitopasi\u00f3n (Autrice: Blanca \u00c1lvarez, IEO Vigo).<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Cela fait dix ans que j\u2019\u00e9cris des articles toutes les 2 ou 3 semaines (249 articles au total). <em>Beaucoup d&rsquo;histoires et beaucoup d&rsquo;autres encore \u00e0 raconter.<\/em> Mais le temps est venu de faire une pause\u2026<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>L&rsquo;exp\u00e9rience a \u00e9t\u00e9 tr\u00e8s positive. <\/strong>Apr\u00e8s une si longue p\u00e9riode, tout ce qui entoure le blog fait d\u00e9sormais partie de la \u00ab\u00a0famille\u00a0\u00bb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>J&rsquo;esp\u00e8re que pour vous aussi.<\/strong> J&rsquo;esp\u00e8re que les articles ont piqu\u00e9 votre curiosit\u00e9 et vous ont laiss\u00e9 des souvenirs. <em>Et si ce n&rsquo;est pas le cas, vous pourrez toujours revenir pour red\u00e9couvrir le blog car il se poursuivra ici<\/em>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les visites se sont multipli\u00e9es chaque ann\u00e9e gr\u00e2ce aux critiques parues dans divers m\u00e9dias. Les pays qui accueillent le plus de visiteurs sont &#8211; dans cet ordre &#8211; l&rsquo;Espagne, l&rsquo;\u00c9quateur, le Mexique, l&rsquo;Argentine et le Chili (85 % entre 2016 et 2021). Et entre 2020 et 2021, le blog a re\u00e7u plus de 410 000 visites.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Merci beaucoup \u00e0 tous ceux qui l&rsquo;ont suivi au fil des ans.<\/strong><br>J&rsquo;ai beaucoup appris en l&rsquo;\u00e9crivant et vos commentaires m&rsquo;ont encourag\u00e9 \u00e0 consacrer du temps \u00e0 tous les articles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Je continuerai \u00e0 faire de la divulgation sur mon compte twitter (@Lilestak) autant que je le peux et autant que j&rsquo;en ai envie. J&rsquo;y publierai des mini-films, des textes, des images et des vid\u00e9os sur le phytoplancton avec le hashtag #Fitopasi\u00f3n. Je vous encourage \u00e0 me suivre.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Apr\u00e8s cet adieu temporaire, passons \u00e0 l&rsquo;article d&rsquo;aujourd&rsquo;hui. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Je vais vous parler de vulgarisation et de sciences citoyennes (ou sciences participatives) avec l&rsquo;exemple d&rsquo;<em>Attheya<\/em> <em>armata<\/em>: <\/strong><em>une diatom\u00e9e surfeuse et une vieille connaissance de ce blog. <\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les r\u00e9f\u00e9rences bibliographiques sont l&rsquo;une des caract\u00e9ristiques de Fitopasi\u00f3n. L&rsquo;exigence minimale de tout texte de vulgarisation scientifique fiable est d&rsquo;inclure les sources originales afin de <strong>I)<\/strong> rendre justice aux auteurs, <strong>II)<\/strong> permettre \u00e0 quiconque de contraster ce que vous dites et <strong>III) <\/strong>d\u00e9montrer que vous n&rsquo;inventez pas ce que vous \u00e9crivez.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il est de plus en plus courant qu&rsquo;un article scientifique cite des sources Internet. Et dans le cas de <strong>Fitopasi\u00f3n<\/strong>, je suis fier d&rsquo;avoir une citation dans l\u2019article de <strong><a href=\"https:\/\/doi.org\/10.1016\/j.ecss.2013.07.011\" target=\"_blank\" rel=\"noreferrer noopener\">Odebrecht et col. (2014)<\/a><\/strong> &amp; <strong><a href=\"https:\/\/doi.org\/10.1016\/j.ecss.2018.02.033\" target=\"_blank\" rel=\"noreferrer noopener\">Carballeira et col. (2018)<\/a><\/strong>, plus pr\u00e9cis\u00e9ment d\u2019un article que j&rsquo;ai publi\u00e9e en 2011: <a href=\"https:\/\/fitopasion.com\/2011\/10\/attheya-el-alga-que-toma-el-sol-en-la.html\" target=\"_blank\" rel=\"noreferrer noopener\"><em>Attheya<\/em>: el alga que toma el sol en la playa<\/a>.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/cita-fitopasion-1.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1030\" height=\"271\" src=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/cita-fitopasion-1-1030x271.jpg\" alt=\"\" class=\"wp-image-22821\" srcset=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/cita-fitopasion-1-1030x271.jpg 1030w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/cita-fitopasion-1-300x79.jpg 300w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/cita-fitopasion-1-768x202.jpg 768w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/cita-fitopasion-1-705x185.jpg 705w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/cita-fitopasion-1-450x118.jpg 450w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/cita-fitopasion-1.jpg 1220w\" sizes=\"auto, (max-width: 1030px) 100vw, 1030px\" \/><\/a><figcaption>Extrait des references de de Odebrecht et col. (2014).<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Cet automne-l\u00e0, l&rsquo;article de <strong>Fitopasi\u00f3n <\/strong>a \u00e9t\u00e9 le premier relev\u00e9 de diatom\u00e9es dans la zone de d\u00e9ferlement des vagues dans la Peninsule Ib\u00e9rique (et le 2\u00e8me enregistrement pour l&rsquo;Espagne apr\u00e8s les \u00eeles Canaries : <strong>Ojeda et O\u2019Shanahan, 2005<\/strong>).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>C&rsquo;est surprenant non ?<\/em> Je n\u2019\u00e9tais m\u00eame pas au courant ! Cela donne une id\u00e9e des recherches en cours et des surprises que la mer nous r\u00e9serve. Il montre \u00e9galement l&rsquo;importance de la science participative\u2026<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Toute personne curieuse et ayant un t\u00e9l\u00e9phone portable \u00e0 port\u00e9e de main peut soumettre ses observations \u00e0 des applications et des sites web qui encouragent la participation de la soci\u00e9t\u00e9 \u00e0 des projets de recherche. <em>Votre observation peut \u00eatre nouvelle et peut faire avancer la communaut\u00e9 scientifique, n&rsquo;h\u00e9sitez pas.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Citons par exemple les projets sur la biodiversit\u00e9 marine tels que <strong><a href=\"https:\/\/diversimar.cesga.es\/\" target=\"_blank\" rel=\"noreferrer noopener\">DIVERSIMAR<\/a><\/strong> <strong>(CN-IEO, CSIC)<\/strong> sur les d\u00e9chets marins (<strong><a href=\"http:\/\/www.cleanatlantic.eu\/es\/monitoring-and-data-management\/\" target=\"_blank\" rel=\"noreferrer noopener\">CLEANATLANTIC<\/a><\/strong> ou <strong><a href=\"https:\/\/www.eea.europa.eu\/themes\/water\/europes-seas-and-coasts\/assessments\/marine-litterwatch\/at-a-glance\/european-citizens-to-help-tackle\" target=\"_blank\" rel=\"noreferrer noopener\">Marine LitterWatch<\/a><\/strong> de l&rsquo;Agence europ\u00e9enne pour l&rsquo;environnement), ou encore sur les d\u00e9veloppements d\u2019eaux color\u00e9es <a href=\"https:\/\/www.phenomer.org\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PHENOMER <\/strong>(<em><strong>Ifremer<\/strong><\/em>)<\/a> en Bretagne.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\">L\u2019action de science participative qui nous concerne le plus dans ce blog est celle de <strong>PHENOMER<\/strong>. Son responsable, <strong>Raffaele Siano<\/strong> (chercheur \u00e0 l&rsquo;Ifremer), a publi\u00e9 en 2020 un article r\u00e9sumant l&rsquo;activit\u00e9 entre 2013-15.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Au cours de ces 3 ann\u00e9es de suivis, ils ont relev\u00e9 74 ph\u00e9nom\u00e8nes d&rsquo;eaux color\u00e9es en Bretagne (dont 45 d&rsquo;entre eux n\u2019avaient pas \u00e9t\u00e9 d\u00e9tect\u00e9s par le r\u00e9seau de surveillance du phytoplancton nuisible).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les signalements ont permis d&rsquo;\u00e9tudier l&rsquo;\u00e9tendue g\u00e9ographique et la dur\u00e9e des efflorescences (<em>blooms<\/em>) de <em><strong>Noctiluca scintillans <\/strong><\/em>et <em><strong>Lepidodinium chlorophorum<\/strong><\/em>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un \u00e9v\u00e9nement de mortalit\u00e9 des bivalves a \u00e9galement co\u00efncid\u00e9 avec les signalements d\u2019une mar\u00e9e brune domin\u00e9e par des raphidophytes (<em><strong>Heterosigma akashiwo<\/strong><\/em> et <em><strong>Pseudochattonella verruculosa<\/strong><\/em>), qui constituent un nouveau risque dans la r\u00e9gion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La science participative peut apporter \u00e9norm\u00e9ment \u00e0 la recherche si nous fournissons les moyens n\u00e9cessaires \u00e0 partir des centres de recherche.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En Galice, il n&rsquo;y a pas de projet sur les d\u00e9veloppements d\u2019eaux color\u00e9es comme <strong>PHENOMER<\/strong>. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cependant, une initiative similaire serait tr\u00e8s int\u00e9ressante car il s&rsquo;agit d&rsquo;\u00e9pisodes courants ayant un impact socio-\u00e9conomique et environnemental, tant positif (en raison de la biomasse pour les niveaux trophiques sup\u00e9rieurs ou de la bioluminescence produite par certains) que n\u00e9gatif (en raison des \u00e9ventuelles toxines, des effets nocifs et des risques pour la sant\u00e9 publique).<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-image\"><figure class=\"alignright size-full\"><a href=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/siano-2018.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"565\" height=\"565\" src=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/siano-2018.jpg\" alt=\"\" class=\"wp-image-22833\" srcset=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/siano-2018.jpg 565w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/siano-2018-300x300.jpg 300w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/siano-2018-80x80.jpg 80w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/siano-2018-36x36.jpg 36w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/siano-2018-180x180.jpg 180w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/siano-2018-120x120.jpg 120w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/siano-2018-450x450.jpg 450w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/siano-2018-150x150.jpg 150w\" sizes=\"auto, (max-width: 565px) 100vw, 565px\" \/><\/a><figcaption>A, B, C) Efflorescences de <em>Noctiluca scintillans<\/em>. D, E, F) <em>Lepidodinium chlorophorum<\/em>. Auteur: Siano et col. (2020). Source: <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0308597X16306169\" target=\"_blank\" rel=\"noreferrer noopener\">ScienceDirect<\/a>.<\/figcaption><\/figure><\/div>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Dans l\u2019article d&rsquo;aujourd&rsquo;hui, j&rsquo;aborderai un type de prolif\u00e9ration diff\u00e9rent des mar\u00e9es rouges, car il ne colore que le sable et l&rsquo;\u00e9cume des vagues : <em><strong>les diatom\u00e9es surfeuses<\/strong><\/em>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans Fitopasi\u00f3n nous avons parl\u00e9 de prolif\u00e9rations et de mar\u00e9es de toutes les couleurs. On les trouve g\u00e9n\u00e9ralement entre le printemps et l&rsquo;automne dans la colonne d&rsquo;eau (ou s&rsquo;il s&rsquo;agit d&rsquo;esp\u00e8ces benthiques sur les macroalgues et les s\u00e9diments). <em>Mais le cas des diatom\u00e9es surfeuses est diff\u00e9rent..<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Leurs efflorescences ne semblent pas suivre un sch\u00e9ma saisonnier classique, elles s&rsquo;observent tout au long de l&rsquo;ann\u00e9e. Elles ont besoin de la houle pour produire suffisamment de mousse afin de s\u2019agr\u00e9ger et se d\u00e9placer avec les vagues, colorant ainsi le sable et les vagues en brun. L&rsquo;automne et l&rsquo;hiver sont des p\u00e9riodes favorables \u00e0 leur croissance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nous allons nous concentrer sur une esp\u00e8ce surfeuse : <strong><em>Attheya armata.<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le travail de <strong>Odebrecht et col. (2014) <\/strong>s\u2019intitule <strong>\u00abSurf zone diatoms: A review of the drivers, patterns and role in sandy beaches food chains\u00bb<\/strong>. Ils y d\u00e9crivent la distribution g\u00e9ographique de ces diatom\u00e9es, en Europe on les retrouve en France (baie d&rsquo;Audierne, Bretagne) et en Espagne (Galice (<a href=\"https:\/\/fitopasion.com\/2011\/10\/attheya-el-alga-que-toma-el-sol-en-la.html\" target=\"_blank\" rel=\"noreferrer noopener\">Fitopasi\u00f3n<\/a>) et Canaries <strong>(Ojeda et O\u2019Shanahan, 2005)<\/strong>). <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Carballeira et col. (2018), <\/strong>en plus de faire un article de review sur <em>Attheya armata<\/em>, ont \u00e9galement r\u00e9alis\u00e9 un \u00e9chantillonnage en Galice avec un titre original: <strong><em>Attheya armata<\/em> along the European Atlantic coast \u2013 The turn of the screw on the causes of \u201csurf diatom\u201d<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La plupart des relev\u00e9s de diatom\u00e9es surfeuses (comprenant des genres tels que <em>Anaulus<\/em>, <em>Asterionellopsis<\/em>, Aulacodiscus, <em>Odontella<\/em>, etc.) sont situ\u00e9s dans l&rsquo;h\u00e9misph\u00e8re sud (Am\u00e9rique, Afrique et Oc\u00e9anie). <strong>Carballeira et col. <\/strong>incluent quand m\u00eame une liste exhaustive de la distribution europ\u00e9enne d&rsquo;<em>Attheya armata<\/em> soulignant qu&rsquo;il s&rsquo;agit d&rsquo;une esp\u00e8ce autochtone d\u00e9j\u00e0 d\u00e9crite en Angleterre en 1860 et avec une large distribution (Royaume-Uni, France, Pays-Bas, Belgique et Espagne).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Parce qu&rsquo;elles habitent une bande \u00e9troite (la zone de d\u00e9ferlement des vagues), les cellules d\u2019<em>Attheya<\/em> n&rsquo;apparaissent g\u00e9n\u00e9ralement pas dans la surveillance du phytoplancton c\u00f4tier analysant des \u00e9chantillons de la colonne d&rsquo;eau. Par cons\u00e9quent, les enregistrements d&rsquo;<em>A. armata<\/em> sont souvent isol\u00e9s, discontinus et de nouvelles observations apparaissent de temps \u00e0 autre dans des zones pourtant d\u00e9j\u00e0 \u00e9tudi\u00e9es pour le plancton marin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cependant, dans la baie bretonne d&rsquo;Audierne, nous savons que ces cellules sont pr\u00e9sentes de mani\u00e8re semi-continue tout au long de l&rsquo;ann\u00e9e et dans ce cas, des documents historiques indiquent une expansion r\u00e9cente dans le sud de la France.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Le terme \u00ab\u00a0diatom\u00e9es surfeuses\u00a0\u00bb n&rsquo;a pas pour seul but d&rsquo;attirer votre attention, <\/strong>en anglais elles sont connues sous le nom de \u00ab<em>surf zone diatoms<\/em>\u00ab. Dans le dictionnaire Oxford, le mot \u00ab<em>surf<\/em>\u00bb signifie \u00ab<em>houle, vague, \u00e9cume<\/em>\u00bb. Donc techniquement, ce sont les diatom\u00e9es des vagues, de l&rsquo;\u00e9cume. <em>Et de l\u00e0 \u00e0 dire qu&rsquo;elles surfent, il n&rsquo;y a qu\u2019un pas\u2026<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Elles combinent en fait leur mode de vie <strong>\u00e9pipsamique&nbsp;<\/strong><em>(qui se d\u00e9veloppe attach\u00e9 aux grains de sable ou sur la plage<\/em>) avec des \u201csessions de surf\u201d. Les diatom\u00e9es \u00e9pipsamiques comme&nbsp;<strong><em>Attheya armata<\/em><\/strong> ou&nbsp;<strong><em>Anaulus&nbsp;<\/em><\/strong>remontent \u00e0 la surface du sable en d\u00e9but de journ\u00e9e et disparaissent avant la tomb\u00e9e de la nuit. Le mucus qu&rsquo;elles produisent, et leur forme, leur permettent d&rsquo;adh\u00e9rer aux particules de sable et aux bulles, flottant ainsi dans l&rsquo;eau avec l&rsquo;\u00e9cume des vagues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Leurs prolif\u00e9rations ne sont pas dues \u00e0 une pollution d&rsquo;origine humaine.<\/strong>&nbsp;L&rsquo;influence anthropique (exc\u00e8s de nutriments) n&rsquo;est pas forc\u00e9ment n\u00e9cessaire pour stimuler leur croissance. Les plages o\u00f9 elles se d\u00e9veloppent sont g\u00e9n\u00e9ralement expos\u00e9es aux vagues, avec une pente douce et une grande zone de d\u00e9ferlement pour que l&rsquo;\u00e9cume se forme. Parfois, ces plages re\u00e7oivent \u00e9galement des apports d\u2019eaux douces.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le 29 d\u00e9cembre dernier, en me promenant sur la plage de Panx\u00f3n (c\u00f4t\u00e9 est de la plage Am\u00e9rica), j&rsquo;ai observ\u00e9 des t\u00e2ches <strong><em>d&rsquo;Attheya armata<\/em><\/strong>&nbsp;\u00e0 la surface du sable. <em>Voici quelques photos&#8230;<\/em><\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/manchapanor-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1030\" height=\"773\" src=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/manchapanor-1030x773.jpg\" alt=\"\" class=\"wp-image-23021\" srcset=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/manchapanor-1030x773.jpg 1030w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/manchapanor-300x225.jpg 300w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/manchapanor-768x576.jpg 768w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/manchapanor-1536x1152.jpg 1536w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/manchapanor-2048x1536.jpg 2048w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/manchapanor-1500x1125.jpg 1500w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/manchapanor-705x529.jpg 705w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/manchapanor-450x338.jpg 450w\" sizes=\"auto, (max-width: 1030px) 100vw, 1030px\" \/><\/a><figcaption>T\u00e2che d\u2019<em>Attheya armata<\/em> \u00e0 Panx\u00f3n (plage Am\u00e9rica, Pontevedra), 29-XII-2021. Auteur: F. Rodr\u00edguez<\/figcaption><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoomdedo-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1030\" height=\"773\" src=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoomdedo-1030x773.jpg\" alt=\"\" class=\"wp-image-23025\" srcset=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoomdedo-1030x773.jpg 1030w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoomdedo-300x225.jpg 300w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoomdedo-768x576.jpg 768w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoomdedo-1536x1152.jpg 1536w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoomdedo-2048x1536.jpg 2048w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoomdedo-1500x1125.jpg 1500w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoomdedo-705x529.jpg 705w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoomdedo-450x338.jpg 450w\" sizes=\"auto, (max-width: 1030px) 100vw, 1030px\" \/><\/a><figcaption> <em>Attheya armata<\/em> \u00e0 Panx\u00f3n (plage Am\u00e9rica, Pontevedra), 29-XII-2021. Auteur: F. Rodr\u00edguez<\/figcaption><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoommancha-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1030\" height=\"773\" src=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoommancha-1030x773.jpg\" alt=\"\" class=\"wp-image-23027\" srcset=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoommancha-1030x773.jpg 1030w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoommancha-300x225.jpg 300w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoommancha-768x576.jpg 768w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoommancha-1536x1152.jpg 1536w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoommancha-2048x1536.jpg 2048w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoommancha-1500x1125.jpg 1500w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoommancha-705x529.jpg 705w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/zoommancha-450x338.jpg 450w\" sizes=\"auto, (max-width: 1030px) 100vw, 1030px\" \/><\/a><figcaption> <em>Attheya armata<\/em> \u00e0 Panx\u00f3n (plage Am\u00e9rica, Pontevedra), 29-XII-2021. Auteur: F. Rodr\u00edguez<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Elles apparaissent chaque ann\u00e9e mais comme il n&rsquo;existe pas de suivis locaux r\u00e9guliers, il est impossible de conna\u00eetre leur abondance, leur saisonnalit\u00e9 et leur variation interannuelle. Vous pouvez les voir ici au microscope \u00e0 diff\u00e9rents grossissements. Je les ai photographi\u00e9s et enregistr\u00e9s quelques jours plus tard dans notre laboratoire de l&rsquo;IEO \u00e0 Vigo.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6929_2-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1030\" height=\"732\" src=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6929_2-1030x732.jpg\" alt=\"\" class=\"wp-image-23029\" srcset=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6929_2-1030x732.jpg 1030w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6929_2-300x213.jpg 300w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6929_2-768x545.jpg 768w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6929_2-1536x1091.jpg 1536w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6929_2-2048x1455.jpg 2048w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6929_2-1500x1065.jpg 1500w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6929_2-260x185.jpg 260w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6929_2-705x501.jpg 705w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6929_2-450x320.jpg 450w\" sizes=\"auto, (max-width: 1030px) 100vw, 1030px\" \/><\/a><figcaption> Agr\u00e9gats de <em>Attheya armata<\/em> isol\u00e9s \u00e0 Panx\u00f3n, \u00e0 un grossissement de 100x. Auteur: F. Rodr\u00edguez<\/figcaption><\/figure><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<figure class=\"wp-block-gallery columns-3 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6934_2.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"791\" height=\"1030\" src=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6934_2-791x1030.jpg\" alt=\"\" data-id=\"23030\" data-full-url=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6934_2.jpg\" data-link=\"https:\/\/fitopasion.com\/?attachment_id=23030\" class=\"wp-image-23031\" srcset=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6934_2-791x1030.jpg 791w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6934_2-230x300.jpg 230w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6934_2-768x1000.jpg 768w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6934_2-1180x1536.jpg 1180w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6934_2-1152x1500.jpg 1152w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6934_2-541x705.jpg 541w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6934_2-450x586.jpg 450w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6934_2.jpg 1410w\" sizes=\"auto, (max-width: 791px) 100vw, 791px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6935_2-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1030\" height=\"786\" src=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6935_2-1030x786.jpg\" alt=\"\" data-id=\"23032\" data-full-url=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6935_2-scaled.jpg\" data-link=\"https:\/\/fitopasion.com\/?attachment_id=23032\" class=\"wp-image-23033\" srcset=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6935_2-1030x786.jpg 1030w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6935_2-300x229.jpg 300w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6935_2-768x586.jpg 768w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6935_2-1536x1172.jpg 1536w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6935_2-2048x1563.jpg 2048w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6935_2-1500x1144.jpg 1500w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6935_2-705x538.jpg 705w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6935_2-450x343.jpg 450w\" sizes=\"auto, (max-width: 1030px) 100vw, 1030px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6937-2.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1030\" height=\"810\" src=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6937-2-1030x810.jpg\" alt=\"\" data-id=\"23034\" data-full-url=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6937-2.jpg\" data-link=\"https:\/\/fitopasion.com\/?attachment_id=23034\" class=\"wp-image-23035\" srcset=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6937-2-1030x810.jpg 1030w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6937-2-300x236.jpg 300w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6937-2-768x604.jpg 768w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6937-2-1536x1208.jpg 1536w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6937-2-1500x1179.jpg 1500w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6937-2-705x554.jpg 705w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6937-2-450x354.jpg 450w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6937-2.jpg 1642w\" sizes=\"auto, (max-width: 1030px) 100vw, 1030px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6943_2.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1017\" height=\"1030\" src=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6943_2-1017x1030.jpg\" alt=\"\" data-id=\"23036\" data-full-url=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6943_2.jpg\" data-link=\"https:\/\/fitopasion.com\/?attachment_id=23036\" class=\"wp-image-23037\" srcset=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6943_2-1017x1030.jpg 1017w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6943_2-296x300.jpg 296w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6943_2-80x80.jpg 80w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6943_2-768x778.jpg 768w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6943_2-1516x1536.jpg 1516w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6943_2-2022x2048.jpg 2022w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6943_2-36x36.jpg 36w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6943_2-1481x1500.jpg 1481w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6943_2-696x705.jpg 696w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6943_2-450x456.jpg 450w\" sizes=\"auto, (max-width: 1017px) 100vw, 1017px\" \/><\/a><\/figure><\/li><\/ul><figcaption class=\"blocks-gallery-caption\"> <em>Attheya armata <\/em>isol\u00e9 \u00e0 Panx\u00f3n, \u00e0 un grossissement de 250x. Chaque cellule poss\u00e8de deux chloroplastes visibles dans la photo du bas. Auteur: F. Rodr\u00edguez <\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Comme vous pouvez le voir, ces cellules ont des prolongements qui ressemblent \u00e0 des \u00e9pines. Ils sont appel\u00e9es \u00ab\u00a0setae\u00a0\u00bb et sont des projections des valves qui les relient pour r\u00e9aliser des cha\u00eenes, maintenir leur flottabilit\u00e9 et former des agr\u00e9gats qui, \u00e0 premi\u00e8re vue, <em>ressemblent \u00e0 des grumeaux<\/em>. Ils sont typiques de genres de diatom\u00e9es tels que <em><strong>Chaetoceros<\/strong><\/em>.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><a href=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1025\" height=\"1030\" src=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-1025x1030.jpg\" alt=\"\" class=\"wp-image-23105\" srcset=\"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-1025x1030.jpg 1025w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-300x300.jpg 300w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-80x80.jpg 80w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-768x772.jpg 768w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-1528x1536.jpg 1528w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-2038x2048.jpg 2038w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-36x36.jpg 36w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-180x180.jpg 180w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-1493x1500.jpg 1493w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-702x705.jpg 702w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-120x120.jpg 120w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-450x452.jpg 450w, https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/IMG_6909_2-1-150x150.jpg 150w\" sizes=\"auto, (max-width: 1025px) 100vw, 1025px\" \/><\/a><figcaption> <em>Attheya armata <\/em>isol\u00e9s \u00e0 Panx\u00f3n, \u00e0 un grossissement de 400x. Auteur: F. Rodr\u00edguez <\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">En Galice, les informations les plus compl\u00e8tes sur <em>Attheya <\/em>se trouvent dans l\u2019article de <strong>Carballeira et col. (2018)<\/strong>. Dans ce travail, ils r\u00e9v\u00e8lent que sa pr\u00e9sence est \u00e9ph\u00e9m\u00e8re (quelques jours) sur les plages de l&rsquo;estuaire d&rsquo;Ares-Betanzos, surtout en automne et en hiver. Ils ont \u00e9galement \u00e9tudi\u00e9 sa signature isotopique pour \u00e9tudier l&rsquo;origine marine ou contientale des nutriments qu&rsquo;elles utilisent pour se d\u00e9velopper.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Et il semble qu\u2019<em>Attheya<\/em> utilise des nutriments d&rsquo;origine marine mais diff\u00e9rents des nutriments utilis\u00e9s par le plancton se d\u00e9veloppant dans la colonne d&rsquo;eau.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les valeurs moyennes des isotopes \u03b4<sup>13<\/sup>C et \u03b4<sup>15<\/sup>N de <em>A. armata<\/em> \u00e9taient similaires \u00e0 d&rsquo;autres valeurs de r\u00e9f\u00e9rence pour les macroalgues et microalgues benthiques, loin du plancton marin. La conclusion est que <strong>les populations d&rsquo;<em>Attheya<\/em> exploitent principalement les nutriments \u00e0 l&rsquo;interface s\u00e9diment-eau d&rsquo;origine marine<\/strong>, et non les sources anthropiques ou les eaux int\u00e9rieures infiltr\u00e9es dans le sous-sol.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Contrairement \u00e0 la Galice, o\u00f9 elles passent inaper\u00e7ues, l&rsquo;apparition et l&rsquo;ampleur des prolif\u00e9rations d&rsquo;<strong><em>Attheya<\/em><\/strong> dans les \u00eeles Canaries a d\u00e9j\u00e0 inqui\u00e9t\u00e9 les baigneurs des plages de Gran Canaria. En raison de leur couleur, et des grumeaux bruns qu\u2019elles forment, elles ont \u00e9t\u00e9 associ\u00e9es (<em>\u00e0 tort<\/em>) \u00e0 la pollution, aux rejets f\u00e9caux, etc.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Voici une vid\u00e9o enregistr\u00e9e \u00e0 un grossissement de 250x pour vous montrer \u00e0 quoi elles ressemblent.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"1500\" height=\"844\" src=\"https:\/\/www.youtube.com\/embed\/R7pbl2wysko?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=fr-FR&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><strong>La conclusi\u00f3n est que l\u2019on a affaire \u00e0 un ph\u00e9nom\u00e8ne naturel, malgr\u00e9 son apparence quelque peu suspecte.&nbsp;<\/strong><\/strong>Et dans le cas d&rsquo;<em>Attheya armata<\/em>, il ne s&rsquo;agit m\u00eame pas d&rsquo;une esp\u00e8ce invasive mais d&rsquo;une diatom\u00e9e indig\u00e8ne des c\u00f4tes atlantiques europ\u00e9ennes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><strong>Je vous laisse avec une vid\u00e9o sur la plage, <\/strong><\/strong>et une chanson sur la d\u00e9couverte d&rsquo;un <em>Nuevo Mundo<\/em>, <em>je vous souhaite le meilleur pour l&rsquo;ann\u00e9e \u00e0 venir !<\/em><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"1500\" height=\"844\" src=\"https:\/\/www.youtube.com\/embed\/vCHFKYgsz8g?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=fr-FR&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>R\u00e9f\u00e9rences:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Carballeira R. et col. <em>Attheya armata<\/em> along the European Atlantic coast \u2013 The turn of the screw on the causes of \u201csurf diatom\u201d. Est Coast Shelf Sci 204:114-129 (2018).<\/li><li>Odebrecht C. et col. Surf zone diatoms: A review of the drivers, patterns and role in sandy beaches food chains. Est Coast Shelf Sci 150:24-35 (2014).<\/li><li>Ojeda A. et O&rsquo;Shanahan L. Discoloraciones por acumulaciones de la diatomea bent\u00f3nica epips\u00e1mica <em>Attheya armatus<\/em> (Centrales, Bacillariophyta) en playas de arena del S y SW de Gran Canaria (Canarias, Espa\u00f1a). Vieraea, 33:51-58.<\/li><li>Siano R. et col. Citizen participation in monitoring phytoplankton seawater discolorations. Mar Pol 117:103039 (2020).<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Bonjour \u00e0 tous ! Tout d&rsquo;abord, je voudrais annoncer que ce sera le dernier article pour un petit moment. Je n&rsquo;arr\u00eate pas le blog, mais je vais faire une pause. En attendant, j\u2019\u00e9crirai de nouveaux articles seulement lors d&rsquo;occasions sp\u00e9ciales.<\/p>\n","protected":false},"author":2,"featured_media":23018,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[863],"tags":[1028,937,1029,1030],"class_list":["post-25006","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classifiee","tag-attheya-2","tag-diatomees-2","tag-epipsamique","tag-phenomer"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Les diatom\u00e9es surfeuses - Fitopasi\u00f3n<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fitopasion.com\/fr\/2022\/02\/les-diatomees-surfeuses.html\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les diatom\u00e9es surfeuses - Fitopasi\u00f3n\" \/>\n<meta property=\"og:description\" content=\"Bonjour \u00e0 tous ! 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Espero sinceramente que disfrut\u00e9is tanto, \u00f3 al menos una peque\u00f1a parte, de lo mucho que lo hago yo.","sameAs":["https:\/\/fitopasion.com"],"url":"https:\/\/fitopasion.com\/fr\/author\/francisco-rodriguez"}]}},"jetpack_featured_media_url":"https:\/\/fitopasion.com\/wp-content\/uploads\/2022\/01\/panxon-scaled.jpg","jetpack_shortlink":"https:\/\/wp.me\/p6IFqS-6vk","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/fitopasion.com\/fr\/wp-json\/wp\/v2\/posts\/25006","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fitopasion.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fitopasion.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fitopasion.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/fitopasion.com\/fr\/wp-json\/wp\/v2\/comments?post=25006"}],"version-history":[{"count":14,"href":"https:\/\/fitopasion.com\/fr\/wp-json\/wp\/v2\/posts\/25006\/revisions"}],"predecessor-version":[{"id":25020,"href":"https:\/\/fitopasion.com\/fr\/wp-json\/wp\/v2\/posts\/25006\/revisions\/25020"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/fitopasion.com\/fr\/wp-json\/wp\/v2\/media\/23018"}],"wp:attachment":[{"href":"https:\/\/fitopasion.com\/fr\/wp-json\/wp\/v2\/media?parent=25006"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fitopasion.com\/fr\/wp-json\/wp\/v2\/categories?post=25006"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fitopasion.com\/fr\/wp-json\/wp\/v2\/tags?post=25006"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}