Zooplankton vertical distribution in waters of the Mallorca shelf: autumn and summer
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The zooplankton vertical distribution (VD) has been studied in two areas of the Mallorca shelf during December 2009 and July 2010. Five and eight, depth levels were sampled at day/night by using BIONESS an MOCNESS multinet. 17 zooplankton groups were found, where copepods were the most abundant (70%), being responsible of the whole zooplankton VD pattern. Copepod high diversity was found in both months (4.3 bits and 3.3bits) and more than 88 species identified. The highest diversity was found in deeper waters (90-120 m) in the afternoon than during day time (0-90m) in December but in July, always found at deeper layer (100-150 m), suggesting that epipelagic and mesopelagic copepods co-occurred, and diel changes induced the increased diversity. Clausocalanus arcuicornis (13%), Nannocalanus minor (10%) and Pleuromamma (P. gracilis and P. abdominalis, 8% and 6%) were the most abundant. However others such as Acartia clausi and Clausocalanus furcatus appeared in December and Cen ...
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