{"id":292,"date":"2021-03-16T09:27:04","date_gmt":"2021-03-16T08:27:04","guid":{"rendered":"http:\/\/www.oceanblogs.org\/msm99\/?p=292"},"modified":"2021-03-22T09:31:00","modified_gmt":"2021-03-22T08:31:00","slug":"auge-in-auge-mit-einem-lebenden-sauerstoffanzeiger-eye-to-eye-with-a-living-oxygen-indicator","status":"publish","type":"post","link":"https:\/\/www.oceanblogs.org\/msm99\/2021\/03\/16\/auge-in-auge-mit-einem-lebenden-sauerstoffanzeiger-eye-to-eye-with-a-living-oxygen-indicator\/","title":{"rendered":"Auge in Auge mit einem lebenden \u201cSauerstoffanzeiger\u201d &#8211; Eye to eye with a living &#8220;oxygen indicator&#8221;"},"content":{"rendered":"\n<p>Am Boden der eisfreien Bottensee finden wir eindeutige Anzeichen f\u00fcr ausreichend Sauerstoff<\/p>\n\n\n\n<p><em>At the bottom of the ice-free Bothnian Sea we find clear signs of sufficient oxygen.<\/em><\/p>\n\n\n\n<p>Nachdem wir die eisige Bottenwiek verlassen haben, setzen wir das geologische Programm fort: Multicorer und Schwerelote werden eingesetzt , um die nacheiszeitlichen Ablagerungen zu suchen. Sind sie da? Sind sie erodiert? Ganz nebenbei finden wir in unseren MUC-R\u00f6hren den Nachweis, dass hier in der Bottensee auch in einer Wassertiefe von \u00fcber 120 m das Bodenwasser ausreichend bel\u00fcftet ist: aus den R\u00f6hren krabbelt die Riesenassel Saduria hervor, circa 6 cm gro\u00df. Sie muss hier in gro\u00dfen Mengen vorkommen, denn wir haben fast in jeder R\u00f6hre ein Exemplar. Wo diese Krabbeltiere leben, sind die Sedimente verw\u00fchlt und zeigen keine Schichtung mehr. Die Sedimentologen nutzen diesen Umstand, um auch in den \u00e4lteren Ablagerungen anhand der Schichtung sauerstoffarme von sauerstoffreichen Bedingungen am Boden der Ostsee zu unterscheiden.<\/p>\n\n\n\n<p><em>After leaving the icy Bottenwiek, we continue the geological program: multicorers and gravity corers are used to search for post-glacial deposits. Are they there? Are they eroded? Incidentally, we find evidence in our MUC tubes that the bottom water here in the Bothnian Sea is sufficiently ventilated even at a water depth of more than 120 m: the very large isopod Saduria crawls out of the tubes, about 6 cm in size. It must live here in large numbers, because we have a specimen in almost every tube. Where these crawling animals exist, the sediments are churned up and no longer show any stratification. Sedimentologists use this circumstance to distinguish in the older sediments oxygen-poor from oxygen-rich conditions at the bottom of the Baltic Sea, merely on the basis of stratification.<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"945\" height=\"631\" src=\"http:\/\/www.oceanblogs.org\/msm99\/wp-content\/uploads\/sites\/75\/2021\/03\/MSM99_Saduria.jpg\" alt=\"\" class=\"wp-image-294\"\/><figcaption>Die Riesenassel Saduria lebt am Boden der n\u00f6rdlichen Ostseebecken. Sie kann bis zu 9cm gro\u00df werden und gilt als Eiszeiten-Relikt. <em>The large isopod Saduria, up to 9 cm in size, lives on the bottom of the northern Baltic Sea basins and is considered an ice age relict.<\/em> Photo: B. Hentzsch, IOW<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Am Boden der eisfreien Bottensee finden wir eindeutige Anzeichen f\u00fcr ausreichend Sauerstoff At the bottom of the ice-free Bothnian Sea we find clear signs of sufficient oxygen. Nachdem wir die eisige Bottenwiek verlassen haben, setzen wir das geologische Programm fort: Multicorer und Schwerelote werden eingesetzt , um die nacheiszeitlichen Ablagerungen zu suchen. Sind sie da? [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-292","post","type-post","status-publish","format-standard","hentry","category-at-sea"],"_links":{"self":[{"href":"https:\/\/www.oceanblogs.org\/msm99\/wp-json\/wp\/v2\/posts\/292","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oceanblogs.org\/msm99\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oceanblogs.org\/msm99\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oceanblogs.org\/msm99\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oceanblogs.org\/msm99\/wp-json\/wp\/v2\/comments?post=292"}],"version-history":[{"count":2,"href":"https:\/\/www.oceanblogs.org\/msm99\/wp-json\/wp\/v2\/posts\/292\/revisions"}],"predecessor-version":[{"id":296,"href":"https:\/\/www.oceanblogs.org\/msm99\/wp-json\/wp\/v2\/posts\/292\/revisions\/296"}],"wp:attachment":[{"href":"https:\/\/www.oceanblogs.org\/msm99\/wp-json\/wp\/v2\/media?parent=292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oceanblogs.org\/msm99\/wp-json\/wp\/v2\/categories?post=292"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oceanblogs.org\/msm99\/wp-json\/wp\/v2\/tags?post=292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}