Vertical distribution of virus-like particles (VLP) and viruses infecting Micromonas pusilla during late summer in the southeastern Skagerrak, North Atlantic

• Published in: Journal of Plankton Research
• Main Authors: Sahlsten, Elisabeth, Karlson, Bengt
• Format: Text
• Language: English
• Published: Oxford University Press 1998
• Subjects: SHORT COMMUNICATIONS; North Atlantic
• Online Access: http://plankt.oxfordjournals.org/cgi/content/short/20/11/2207; https://doi.org/10.1093/plankt/20.11.2207

Vertical profiles were made at one offshore station and one coastal station, on 4-5 September 1996, in the south-eastern Skagerrak. The surface water of the two stations differed significantly with respect to both temperature and salinity, as the outer station (A) was situated in high-saline water originating from the North Sea, while the low-saline surface water at the inner station (B) was influenced by the Baltic current. Virus-like particle (VLP) abundance was 5 × 109−25 × 1091−1 H in the 0-50 m water column. Maximal VLP values were found in the surface water, although a lower number was detected in the low-saline surface water (0 m depth) at station B. Viruses infective to Micromonas pusilla were estimated to ∼0.01% of the VLP number. The ambient concentrations of dissolved inorganic nutrients were typical for a stratified summer situation, i.e. generally low in the surface waters, although a raised ammonium concentration was associated with the sharp halocline at 5 m depth at station B, and all nutrient levels were increasing below 30 m depth.