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Published byCory Potter Modified over 9 years ago
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Methods Benthic communities classification in the Inner Puck Bay Urszula Janas, Halina Rzemykowska, Institute of Oceanography, University of Gdańsk
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Information on vegetation – present/absent Vegetation cover Dominant species
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% vegetation cover Visually by scuba divers observations – Circle (20 m diameter) at studied stations -50 stations (Maritime Institute) -31 stations (University of Gdańsk) Video camera records during cruises -15 stations (Sea Fisheries Institute, University of Gdańsk) Additionally by image analyses (6 pictures per stations or films).
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% vegetation cover was estimated using 12-grade scale
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Taxa composition and dominant species - macroflora Samples taken by divers – 52 stations DAK sampler (Maritime Institute) Dominant species one or several species > 50 % of total biomass Films (21 stations, Sea Fisheries Institute) and pictures (18 stations, University of Gdańsk) Dominance determined by visual volume (BalMar 2005) Visual volume >50 % of total visual volume
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Visual volume – index obtained by multiplaying the percentage coverage by average height of the species (BalMar 2005).
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For pictures following groups were used: Zostera marina Other vascular plants: Potamogeton spp. / Zannichellia palustris / Ruppia maritima Chara spp. Soft bottom –Covered by filamentous algae –Animals or their activity –Sand
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Taxa composition and dominant species macrofauna Grabs samples collected at 54 stations. Dominant species or group of species Species with biomass >50 % of total biomass
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Dominant species names the biotope. The biotope name may include several species names, when no single species forms required 50 % of visual volume/biomass. In such a case, the next most abundant species are added untill they all together make up 50 % (BalMar 2005).
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Sampling stations Knowledge Publications Aerial photographs and satelite images
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