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**En
Biodiversidad virtual y tambin en
Twiter **Tres lneas vivas suspendidas en el agua, trazas de cristal que vibran al son de las corrientes y navegan impulsadas con el soplo de su propia vida. Unas veces es la enorme fuerza de la corriente la que las arrastra hacia la luz de la superficie o hacia la noche del fondo. Otras veces son ellas las que pueden coser el agua a contracorriente, impulsadas a reaccin por los jugos que guardan en su interior y que liberan a presin en una lucha desigual entre David y Goliat, la vida casi invisible frente al Universo.Las tres lneas de cristal son tres diatomeas del gnero
Nitzschia , muy probablemente
Nitzschia palea, suspendidas en las profundidades del Lago de Sanabria.El gnero
Nitzschia es uno de los ms complejos dentro de las diatomeas, incluye cerca de mil especies, la mayora de ellas marinas, otras de agua dulce y presenta una gran variabilidad de formas y tamaos. Algunas habitan en condiciones extremas de temperatura desarrollndose de manera ptima por debajo de 6C, otras en ambientes hipersalinos o en presencia de altas concentraciones de diferentes sustancias qumicas o de materia orgnica.Las valvas de slice de
Nitzschia suelen presentar una finsima ornamentacin de estras transversales, muchas veces difcilmente observables con el microscopio ptico, pero su principal caracterstica es la posesin de dos rafes situados en posicin marginal, a diferencia de lo que ocurre en el resto de gneros en los que ocupa la parte central de las valvas.A pesar de su aparente indefensin, algunas especies del gnero Nitzschia sintetizan un potente neurotxico, el cido domoico, una toxina que es responsable de la enfermedad humana llamada intoxicacin amnsica y que puede acumularse y causar graves daos a los consumidores de esta alga, adems de un serio problema de contaminacin. La especie de hoy,
Nitzschia palea no presenta estos efectos pero s una interesante particularidad. Siendo un organismo autotrfo y fotosintetizador, en presencia de aguas cargadas de materia orgnica es capaz de prescindir de la fotosntesis y alimentarse directamente de la materia orgnica disuelta en el agua. En una palabra,
Nitzschia palea es alga cuando le conviene. Se trata de una especie que suele estar presente en aguas cargadas de gran cantidad de materia orgnica y por ello un buen bioindicador de contaminacin.La imagen, tomada a 400 aumentos con la tcnica de contraste de interferencia, procede de una muestra recogida a 48 metros de profundidad en el Lago de Sanabria (Zamora) por el grupo de buceadores del GEAS desde el catamarn
Helios Sanabria el primer catamarn del mundo propulsado por energa elica y solar.
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Pera, Faro, Portugal
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Cuzcurrita Rio Tiron, La Rioja, Spain
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Grove, O, Galicia, Spain
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Balea, Galicia, Spain
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Balea, Galicia, Spain
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Grove, O, Galicia, Spain
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Grove, O, Galicia, Spain
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Grove, O, Galicia, Spain
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Grove, O, Galicia, Spain
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Arredondo, Cantabria, Spain
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Ribadelago, Castille and Leon, Spain
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Nitzschia sigmoidea Cingular view. Scale bar indicates 100 µm. Sample from a wetland at the Pillersee (Tyrol, Austria). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Pond Suploch, Hiddensee (Germany) Latitude: 54.538638 Longitude: 13.097802 Gürtelbandansicht. Multiebenen-Abbildung, manuell gestapelt. Der Messbalken markiert eine Länge von 100 µm. Probe aus dem Pillersee in Tirol. Mikrotechnik: Zeiss Universal, Kamera: Olympus C7070. Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Nitzschia sigmoidea Detail: Center of the cell in cingular view with nucleus, cloroplasts with oil droplets (energy store) and the canal raphes. Scale bar indicates 25 µm. Sample from a wetland at the Pillersee (Tyrol, Austria). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Pond Suploch, Hiddensee (Germany) Latitude: 54.538638 Longitude: 13.097802 Detail: Zellmitte in Gürtelbandansicht mit Zellkern, den Chloroplasten mit Öltröpfchen (Speicherstoff) und den beiden Kanalraphen. Multiebenen-Abbildung, manuell gestapelt. Der Messbalken markiert eine Länge von 25 µm. Probe aus dem Pillersee in Tirol. Mikrotechnik: Zeiss Universal, Kamera: Olympus C7070. Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Nitzschia sigmoidea Cingular view. Scale bar indicates 100 µm. Sample from the Domänental pond near Kronshagen (Kiel, Germany). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Axioplan with Olympus OM-D M5 MKII.Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Pond Domänental near Kronshagen (Kiel, Germany) Latitude: 54.33211 Longitude: 10.060821 Gürtelbandansicht. Multiebenen-Abbildung, manuell gestapelt. Der Messbalken markiert eine Länge von 100 µm. Probe aus dem Domänentalteich bei Kronshagen. Mikrotechnik: Zeiss Axioplan, Kamera: Olympus OM-D M 5 MKII. Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Nitzschia sigmoidea Detail: Apex in cingular view, displaying cingulum (central strae and the two canal raphes on the edges. Scale bar indicates 25 µm. Sample from a wetland at the Pillersee (Tyrol, Austria). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Pond Suploch, Hiddensee (Germany) Latitude: 54.538638 Longitude: 13.097802 Detail: Zellspitze in Gürtelbandansicht. Das Gürtelband ist zentral als feine Striche zu erkennen, an den Außenkanten sind die Kanalraphen zu sehen. Multiebenen-Abbildung, manuell gestapelt. Der Messbalken markiert eine Länge von 25 µm. Probe aus dem Pillersee in Tirol. Mikrotechnik: Zeiss Universal, Kamera: Olympus C7070. Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Nitzschia gracilis Scale bar indicates 25 µm. Sample from the Lake Vollstedter See near Kiel, Germany. Sampling date 7/2018. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Axioplan with Olympus OM-D M5 MKII. Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Lake Vollstedter See near Kiel (Germany) Latitude: 54.24105528 Longitude: 9.859339 Multiebenen-Abbildung, manuell gestapelt. Der Messbalken markiert eine Länge von 25 µm. Probe aus dem Vollstedter See bei Groß Vollstedt. Datum der Aufsammlung: 7/2018. Mikrotechnik: Zeiss Axioplan, Kamera: Olympus OM-D M5 MKII. Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Pseudo-nitzschia delicatissima The specimen was gathered in the Kieler Förde (German Baltic Sea). Scale bar indicates 25 µm. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Axioplan with MFT camera Olympus OM-D E-M5 II.Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Baltic Sea, Kieler Förde, Kiel Fjord (Germany) Latitude: 54.3894126 Longitude: 10.1749055 Multiebenen-Abbildung, manuell gestapelt. Der Messbalken markiert eine Länge von 25 µm. Probe aus der Kieler Förde. Mikrotechnik: Zeiss Axioplan Kamera: Olympus OM-D M5 MKII.Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Nitzschia spec. Zoom on keel arcs of Nitzschias special fibulate raphe system. It´s a cingular view with girdle bands in the middle. Scale bar indicates 10 µm. Digital drawing using 12 frames generating depth of focus, stacked manually. The specimen was gathered in a tiny freshwater pond at the island of Hiddensee (Baltic Sea, Germany) which shows a fascinating biodiversity of naked and testate amoebae. Images were taken using Zeiss Standard with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Pond Suploch, Hiddensee (Germany) Latitude: 54.538638 Longitude: 13.097802 Ausschnittsvergrößerung der Kielbögen der Kanalraphe von Nitzschia spec. in Gürtelbandansicht. Multiebenen-Abbildung, manuell gestapelt. Der Messbalken markiert eine Länge von 10 µm. Probe aus einen Kleingewässer auf Hiddensee. Mikrotechnik: Zeiss Universal, Kamera: Olympus C7070.Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Nitzschia spec. Nitzschia spec. with large cells. The insets show overlaping of epi- and hypotheca, the girdle band and keel arcs of the fibulate raphe system and a Chlamydomonas like green flagellate. Scale bar indicates 100µm. Digital drawing using 35 frames generating depth of focus, stacked manually. The specimen was gathered in a tiny freshwater pond at the island of Hiddensee (Baltic Sea, Germany) which shows a fascinating biodiversity of naked and testate amoebae. Images were taken using Zeiss Standard with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Pond Suploch, Hiddensee (Germany) Latitude: 54.538638 Longitude: 13.097802 Nitzschia spec. mit sehr großen Zellen. Die vergrößerten Bildausschnitte zeigen die Überlappungszonen von Epi- and Hypotheca, das Gürtelband und die Kielbögen der Kanalraphe zusammen mit einem grünen Flagellaten (Chlamydomonas). Multiebenen-Abbildung, manuell gestapelt. Der Messbalken markiert eine Länge von 100 µm. Probe aus einen Kleingewässer auf Hiddensee. Mikrotechnik: Zeiss Universal, Kamera: Olympus C7070.Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Nitzschia spec. Nitzschia spec. with large cells. The insets show keel arcs of the fibulate raphe system and the nucleus with nucleolus and the chromatine structure typical for diatom nuclei. Scale bar indicates 100 µm. Digital drawing using 12 frames generating depth of focus, stacked manually. The specimen was gathered in a tiny freshwater pond at the island of Hiddensee (Baltic Sea, Germany) which shows a fascinating biodiversity of naked and testate amoebae. Images were taken using Zeiss Standard with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Pond Suploch, Hiddensee (Germany) Latitude: 54.538638 Longitude: 13.097802 Nitzschia spec. mit sehr großen Zellen. Die vergrößerten Bildausschnitte zeigen die Kielbögen der Kanalraphe und den Zellkern mit der stark hervortretenden granulösen Struktur des Karyoplasmas, wie es für Kerne von Diatomeen typisch ist. Multiebenen-Abbildung, manuell gestapelt. Der Messbalken markiert eine Länge von 100 µm. Probe aus einen Kleingewässer auf Hiddensee. Mikrotechnik: Zeiss Universal, Kamera: Olympus C7070.Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Nitzschia spec. Zoom on the nucleus of Nitzschia with nucleolus and the chromatine structure typical for diatom nuclei. Scale bar indicates 10 µm. The specimen was gathered in a tiny freshwater pond at the island of Hiddensee (Baltic Sea, Germany) which shows a fascinating biodiversity of naked and testate amoebae. Images were taken using Zeiss Standard with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Pond Suploch, Hiddensee (Germany) Latitude: 54.538638 Longitude: 13.097802 Ausschnittsvergrößerung des Kerns von Nitzschia spec. mit Nukleolus und der stark hervortretenden granulösen Struktur des Karyoplasmas, wie es für Kerne von Diatomeen typisch ist. Multiebenen-Abbildung, manuell gestapelt. Der Messbalken markiert eine Länge von 10 µm. Probe aus einen Kleingewässer auf Hiddensee. Mikrotechnik: Zeiss Universal, Kamera: Olympus C7070.Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Pseudo-nitzschia pungens The specimen was gathered in the Kieler Förde (German Baltic Sea). Scale bar indicates 50 µm. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Axioplan with MFT camera Olympus OM-D E-M5 II.Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Baltic Sea, Kieler Förde, Kiel Fjord (Germany) Latitude: 54.3894126 Longitude: 10.1749055 Multiebenen-Abbildung, manuell gestapelt. Der Messbalken markiert eine Länge von 50 µm. Probe aus der Kieler Förde. Mikrotechnik: Zeiss Axioplan Kamera: Olympus OM-D M5 MKII.Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Pseudo-nitzschia pungens Scale bar indicates 100 µm. The specimen was gathered in the Kieler Förde (Baltic Sea). Sampling date 2/2022. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Axioplan with Olympus OM-D M5 MKII. Image under Creative Commons License V 3.0 (CC BY-NC-SA). Place name: Baltic Sea, Kieler Förde, Kiel Fjord (Germany) Latitude: 54.3894126 Longitude: 10.1749055 Multiebenen-Abbildung, manuell gestapelt. Der Messbalken markiert eine Länge von 100 µm. Probe aus der Kieler Förde. Datum der Aufsammlung: 2/2022. Mikrotechnik: Zeiss Axioplan, Kamera: Olympus OM-D M5 MKII. Creative Commons License V 3.0 (CC BY-NC-SA). For permission to use of (high-resolution) images please contact postmaster@protisten.de.