Abundance of microzooplankton in surface waters of the East Atlantic and Mediterranean in August-September 1970

• Main Author: Zaika, Viktor E
• Format: Dataset
• Language: English
• Published: PANGAEA 1972
• Subjects: Archive of Ocean Data; ARCOD; Atlantic Ocean; Mediterranean Sea; Mikhail Lomonosov; ML25; ML25_AOPl-1; ML25_AOPl-10; ML25_AOPl-11; ML25_AOPl-12; ML25_AOPl-2; ML25_AOPl-3; ML25_AOPl-4-5; ML25_AOPl-6; ML25_AOPl-7; ML25_AOPl-8; ML25_AOPl-9; ML25_MSPl-1; ML25_MSPl-10; ML25_MSPl-11; ML25_MSPl-12; ML25_MSPl-13; ML25_MSPl-14; ML25_MSPl-15; ML25_MSPl-16; ML25_MSPl-17; ML25_MSPl-2; ML25_MSPl-3; ML25_MSPl-4; ML25_MSPl-5; ML25_MSPl-6; ML25_MSPl-7; ML25_MSPl-8; ML25_MSPl-9; Plankton water sample; PLAWS
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.754860; https://doi.org/10.1594/PANGAEA.754860

Abundance of microzooplankton was studied from August to October 1970 in a ship laboratory using the method of concentration of water samples by filtration and then counting living organisms under a microscope. The main groups (in order of decreasing abundance) were as follows: infusorians, nauplii, copepodids, radiolarians, appendicularians, and some others (rotifers, worm and mollusk larvae). Concentration of infusorians rarely exceeded 100 #/l, possibly an underestimate. Nauplii often numbered 20 to 30 #/l. Study of vertical distribution of microzooplankton showed that peak concentrations in the Mediterranean Sea were at depth of 20-30 m regardless of day time. There were 2 peaks in the Atlantic Ocean, one in the 10- to 20-m layer, the other in the 50- to 75-m layer.