Establishment of brown shrimp (Crangon crangon) in a newly colonized area

in Crustaceana
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The brown shrimp (Crangon crangon) is widely distributed in the coastal areas of the eastern Atlantic, but was only recently found in Icelandic waters. In this study, annual and seasonal changes in population abundance of brown shrimp southwest of Iceland were recorded from 2005 to 2014 in order to see whether the species has established itself in Icelandic waters. In general, the population grew in the beginning of the study period and seems to have somewhat stabilized in the past few years. The average density of shrimps each month rarely exceeded 200 individuals per 100 m2. The number of juveniles increased in July/August and again in February, indicating bi-annual spawning. The relative abundance of adults was significantly affected by both the number of juveniles of the previous summer and the sea surface temperature. Brown shrimp seem to have rapidly adapted to Icelandic waters and have become established and are highly successful in the newly colonized area.

Establishment of brown shrimp (Crangon crangon) in a newly colonized area

in Crustaceana



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    Sampling location of brown shrimp, Crangon crangon (L., 1758), at Helguvík Bay (■) and temperature in Reykjavik harbour (▲). Depth contours at 100 and 200 m.

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    Annual mean population density (±SE) of brown shrimp, Crangon crangon (L., 1758), from 2005 to 2014. Filled symbols indicate adults (TL > 19.99 mm) and open symbols refer to juveniles (TL < 20.00 mm).

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    Population density (mean number per 100 m2 ± SE) of brown shrimp, Crangon crangon (L., 1758), from 2005 to 2014. Filled symbols indicate adults (TL > 19.99 mm) and open symbols refer to juveniles (TL < 20.00 mm).

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    The proportion of juveniles, males and females of the brown shimp, Crangon crangon (L., 1758), from May 2008 to July 2010. No sample was collected from October 2008 to July 2009.

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    Average monthly mean temperature (±SE) from 2005 to 2014 in Reykjavík harbour.

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    The proportion of females of brown shrimp, Crangon crangon (L., 1758), at different lengths.

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    The sex ratio of brown shrimp, Crangon crangon (L., 1758), in relation to total length (mm).

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