Browsing Articles by Author "Skjoldal, Hein Rune"
Now showing items 21-24 of 24
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Species composition of three size fractions of zooplankton used in routine monitoring of the Barents Sea ecosystem
Skjoldal, Hein Rune (Peer reviewed; Journal article, 2021)Size fractionation with 2000 and 1000 μm screens is used by the Institute of Marine Research in Norway in routine monitoring of zooplankton biomass. This study examines the separation of taxa by this procedure. For copepods ... -
Sudden change in long-term ocean climate fluctuations corresponds with ecosystem alterations and reduced recruitment in Norwegian spring-spawning herring (Clupea harengus, Clupeidae)
Toresen, Reidar; Skjoldal, Hein Rune; Vikebø, Frode Bendiksen; Martinussen, Monica Bente (Journal article; Peer reviewed, 2019)Fish stocks vary in abundance. The causes behind the fluctuations may be difficult to determine, especially ones caused by natural fluctuations, but long‐term data series may provide indications of the mechanisms. Assessments ... -
Vertical distribution of fish and krill beneath water of varying optical properties
Kaartvedt, Stein; Melle, Webjørn; Knutsen, Tor; Skjoldal, Hein Rune (Journal article; Peer reviewed, 1996-06-06)The distribution of acoustical scattering layers of fish and krill changed markedly in concert with fluctuating fluorescence (chlorophyll a) in upper waters, possibly due to a varying 'shadow effect'. Beneath clear waters ... -
Zooplankton reproduction in the Barents Sea vertical distribution of eggs and nauplii of Calanus finmarchicus in relation to spring phytoplankton development
Melle, Webjørn; Skjoldal, Hein Rune (Chapter, 1989)Variable influence of ice melting on water column stabilization causes a large variation in timing of the spring phytoplankton bloom in the central Barents Sea. During two cruises in April 1986 and May-June 1987 situations ...