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Population Features of the Caridean Shrimp, Sclerocrangon Boreas (phipps, 1774) In Isfjorden, Spitsbergen

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image of Crustaceana

Population parameters in crustaceans are not easily obtained due to a lack of satisfactory methods for establishing the age of individuals. In this study, the problem is approached by the use of length-frequency data. A statistical computer program, MIX, was used to interpret the mixture of distributions based on length-frequency data (analysis of modality). The modal length groups were assumed to be equivalent with age groups. One group of males and three groups of females were observed. The carapace length (CL) ranged from 7.6 to 14.9 mm in males and was 7.9-23.4 mm in females. The smallest individuals of males and females, the first age groups, were probably lost due to the sampling technique. The proportion of ovigerous females (20.0-24.0 mm CL) showed an increase from 25% to 75%, and 45.5% of all females within this size range were ovigerous. Male and female length-weight relationships displayed no significant differences (P = 0.437) within the second age group. Annual biomass amounted to 0.032 g AFDW · m-2 (Ash Free Dry Weight) (0.012 in males and 0.020 g AFDW · m-2 in females). Mortality was 0.41 · yr-1 in males and 0.19 · yr-1 in females.

Populationsanalysen von Crustaceen gestalten sich oftmals schwierig, da es an geeigneten Methoden für die Altersbestimmung mangelt. In dieser Studie wird versucht, das Problem über die Analyse von Längen-Häufigkeits-Verteilungen zu lösen. Dabei wird das Computerprogramm "MIX" verwendet, welches in der Lage ist, einzelne Längengruppen aus einer Längen-Häufigkeits-Verteilung zu modellieren. Diese Längengruppen wurden Altersgruppen gleichgesetzt. Für Männchen wurde eine Altersgruppe, für Weibchen drei Altersgruppen ermittelt. Die individuelle Carapaxlänge (CL) reichte von 7,6 bis 14,9 mm bei Männchen und von 7,9 bis 23,4 bei Weibchen. Die kleinsten Individuen der ersten Altersgruppe gingen bei Männchen und Weibchen vermutlich wegen der Verwendung eines ungeeigneten Probennahmegerätes verloren. Der Anteil eiertragender Weibchen stieg von 25% auf 75% (von 20,0 bis 24,0 mm CL); der absolute Anteil eiertragender Weibchen in dieser Größenklasse betrug 45%. Die Längen-Gewichts-Beziehung von Männchen und Weibchen zeigte innerhalb der zweiten Altersgruppe keine signifikanten Unterschiede (P = 0,437). Die jährliche Biomasse betrug 0,032 g AFDW · m-2 (Ash Free Dry Weight) (0,012 für Männchen und 0,020 g AFDW · m-2 für Weibchen). Die Mortalität bei Männchen betrug 0,41 · yr-1 und bei Weibchen 0,19 · yr-1.


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