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“Sea grapes” may sound like something Poseidon would snack on, and not a killer algae. Yet Caulerpa racemosa var. cylindracea poses a serious threat to marine life. Spread by the bilge water of boats, this fast-growing alga is quick to take root, squeezing out native species. But there is one spot in the Mediterranean where cylindracea hasn’t yet taken over, and biologists like Juan Manuel Ruiz Fernández are trying to discover why.
read moreDuration: 5:27Published: Wed, 14 Dec 2011 20:13:28 +0000
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South Pacific Ocean, Duration 11 seconds
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Pediastrum granulatum.
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Portrait of Lobomonas stellata (Chodat), a volvocid flagellate. The ellipsoid to pear-shaped protoplast is separated from the cell wall by a space containing gelatinous material. The cell wall has irregularly spaced conical protrusions. There is one large cup-shaped chloroplast. A pyrenoid is located posteriorly. A peripheral stigma is located in the anterior 1/3 of the cell. Two equal flagella are about the length of the cell body. From freshwater pond near Boise, Idaho. Phase contrast.
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This image was made from samples taken during a scientific cruise in the Pacific. Water was filtered to concentrate the organisms that were present, then dried onto a thin sheet of plastic and then shadowed with a fine layer of metal to provide contrast. The preparation was then observed with an electron-microscope. This technique has been used to document the diversity of marine microbes, especially, protists in the oceans.
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Chlamydomonas (clam-ee-doe-moan-ass) a common volvocid (green alga) flagellate. Cells vary in shape from elongate to rounded, this being one of the more elongate cells. With a cell wall, a cup-shaped chloroplasts with chlorophyll B, a red eyespot located external to the plastid, and two equal flagella emerging from the anterior pole of the cell. Differential interference contrast. Animations by Rosemary Arbur of flagellar beat patterns are available
here. Material from Nymph Creek and Nymph Lake, thermal sites within Yellowstone Park, photograph by Kathy Sheehan and David Patterson.
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Portrait (lateral view) of the Prasinophyte, Nephroselmis olivacea (Stein, 1878). Cell outline is reniform. Strongly laterally compressed. Two unequal flagella insert at an invagination in midbody. The shorter flagellum is directed anteriorly during swimming, the longer trailing. Single cup-shaped chloroplast with pyrenoid; eyespot lies on the chloroplast in front of the short flagellum. Freshwater species with a contractile vacuole. The cytoplasm contains refractile particles of starch storage compounds. Cells covered with up to 7 types of scales seen by electron microscopy. The flagella are covered by a complex arrangement of heteromorphic scales. Collected from freshwater pond near Boise, Idaho July 2004. DIC optics.
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In vivo portrait of the volvocid flagellate, Volvulina steinii Playfair,1915. Collected from a temporary rainwater puddle on a grass lawn in Boise, Idaho 43°36'49.03" N 116° 13' 23.77" W elev. 2674 ft.March 2006.Brightfield.
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Colony in interlaced sheaths of mucilage. Scale bar indicates 25 µm. Sample from sphagnum pond situated in the northern alpine region of Austria near Salzburg. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Portrait of the chlorellacean Tetraedron minimum var. minimum (A. Braun) Hansgirg. DIC.
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Sverige
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Vanserum, Öland, Sverige
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Blåkilde Mølle, Hobro, Danmark
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Randers Fjord
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Lilleør, Samsø, Danmark
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Oulanka Nationalpark, Kuusamo, Finland
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Sangstrup Klint
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Fusola viridis; Oocystia borgei; Chordatella citriformis; Pleurococcus regularis Artari.
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Chaetomorpha linum.
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Chlorophycees (Algues vertes) Confervacees, Enteromorpha Linza (L.)P J. Ag..
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Cladophora rupestris.
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Dasycladus occidentalis.
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Chlorophycees (Algues vertes) Confervacees, Chaetomorpha aerea (Dillw.) Ktz..
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Caulerpa paspaloides.