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Distribution and spatial variation of hydrothermal faunal assemblages at Lucky Strike (Mid-Atlantic Ridge) revealed by high-resolution video image analysis 5
Cuvelier, Daphne; Sarrazin, Jozee; Colaco, Ana; Copley, Jon; Desbruyeres, Daniel; Glover, Adrian G.; Tyler, Paul; Santos, Ricardo Serrao.
Whilst the fauna inhabiting hydrothermal vent structures in the Atlantic Ocean is reasonably well known, less is understood about the spatial distributions of the fauna in relation to abiotic and biotic factors. In this study, a major active hydrothermal edifice (Eiffel Tower, at 1690 m depth) on the Lucky Strike vent field (Mid-Atlantic Ridge (MAR)) was investigated. Video transects were carried out by ROV Victor 6000 and complete image coverage was acquired. Four distinct assemblages, ranging from dense larger-sized Bathymodiolus mussel beds to smaller-sized mussel clumps and alvinocaridid shrimps, and two types of substrata were defined based on high definition photographs and video imagery. To evaluate spatial variation, faunal distribution was mapped...
Tipo: Text Palavras-chave: Vent ecology; Mid Atlantic Ridge; Hydrothermal vent; Lucky Strike; Video analysis; Faunal assemblages; Spatial distribution; Community structure.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-7328.pdf
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Long-term dietary-exposure to non-coplanar PCBs induces behavioral disruptions in adult zebrafish and their offspring 5
Pean, Samuel; Daouk, Tarek; Vignet, Caroline; Lyphout, Laura; Leguay, Didier; Loizeau, Veronique; Begout, Marie-laure; Cousin, Xavier.
The use of polychlorinated biphenyls (PCBs) has been banned for several decades. PCBs have a long biological half-life and high liposolubility which leads to their bioaccumulation and biomagnification through food chains over a wide range of trophic levels. Exposure can lead to changes in animal physiology and behavior and has been demonstrated in both experimental and field analyses. There are also potential risks to high trophic level predators, including humans. A maternal transfer has been demonstrated in fish as PCBs bind to lipids in eggs. In this study, behavioral traits (exploration and free swimming, with or without challenges) of contaminated zebrafish (Danio rerio) adults and their offspring (both as five-day-old larvae and as two-month-old fish...
Tipo: Text Palavras-chave: Exploration; Swimming activity; Organic pollutant effects; Generation; Video analysis.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00167/27799/26068.pdf
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Movement behaviour and video tracking of Milnesium tardigradum Doyère, 1840 (Eutardigrada, Apochela) 16
Shcherbakov, D.; Schill, R.O.; Brümmer, F.; Blum, M..
Tardigrades or ‘water-bears’ live in moist environments with a high degree of gaseous exchange. In tardigrades, locomotion is essential, e.g. for feeding, to find sexual partners and to adjust the level of hydration by moving to wetter or dryer environments. Here we report on the movement behaviour of Milnesium tardigradum in automated experiments using custom-made video tracking software. The experiments involved 754 hours of recording involving 32 individuals. No significant differences in mobility were observed under infrared versus visible light conditions, representing night and day, respectively. The mean recorded velocity was 23.3 ± 7.38 mm/h, with a maximum of 1166.4 mm/h.
Tipo: Article / Letter to the editor Palavras-chave: Locomotion; Tardigrada; Video analysis; 42.71.
Ano: 2010 URL: http://www.repository.naturalis.nl/record/330854
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