NDLI: An Antarctic krill (Euphausia superba) hotspot: population characteristics, abundance and vertical structure explored from a krill fishing vessel

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An Antarctic krill (Euphausia superba) hotspot: population characteristics, abundance and vertical structure explored from a krill fishing vessel

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An Antarctic krill (Euphausia superba) hotspot: population characteristics, abundance and vertical structure explored from a krill fishing vessel

Content Provider	Springer Nature Link
Author	Krafft, B. A. Skaret, G. Knutsen, T.
Copyright Year	2015
Abstract	Antarctic krill (Euphausia superba) aggregate in various ways depending on a range of biological and physical factors. In some areas, typically associated with bathymetric features such as shelf edges and canyons, they may aggregate densely to form hotspots. Despite the importance of such hotspots, their development over time in demographic composition and spatial distribution is not well understood. A fishing vessel during regular operation was used for collection of krill demographic and acoustic data on the shelf northwest of South Orkney Islands. Results show a decrease in the proportion of subadult males, partly reflected in an increase in mature adult males. Concurrently, there was a change in the proportion of males in the sampled population from 0.8 to 0.3, indicating immigration or emigration of krill through the hotspot. A clear trend was observed in the diurnal vertical distribution with deeper and more vertically compact swarms during the day. However, some days displayed very small differences between the day and night distribution and considerable variability in the daytime depth distribution. It was noted that although fishing was carried out during the entire period of the study, there was no obvious trend in the acoustic backscatter, suggesting that the overall krill density was not changing during this period. Using a fishing vessel as a research platform has advantages for understanding the dynamics of the fishery and in quantifying biological and physical processes during actual exploitation of these resources.
Starting Page	1687
Ending Page	1700
Page Count	14
File Format	PDF
ISSN	07224060
Journal	Polar Biology
Volume Number	38
Issue Number	10
e-ISSN	14322056
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-06-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	South Orkney Islands Southern Ocean Zooplankton Reproduction Hydro acoustics Diel vertical migration Ecology Oceanography Microbiology Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Agricultural and Biological Sciences

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An Antarctic krill (Euphausia superba) hotspot: population characteristics, abundance and vertical structure explored from a krill fishing vessel

Distribution, abundance and vertical migration pattern of krill - Euphausia superba Dana at fishing area 58 of the Indian Ocean sector of Southern Ocean

Circadian regulation of diel vertical migration (DVM) and metabolism in Antarctic krill Euphausia superba.

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Zooplankton biomass and abundance of antarctic krill euphausia superba dana in indian ocean sector of the southern ocean (1992).

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Distribution, abundance and vertical migration pattern of krill - Euphausia superba Dana at fishing area 58 of the Indian Ocean sector of Southern Ocean

Zooplankton studies with special reference to krill Euphausia superba Dana from fishing area 58 of Indian Ocean sector in Southern Ocean

An Antarctic krill (Euphausia superba) hotspot: population characteristics, abundance and vertical structure explored from a krill fishing vessel

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An Antarctic krill (Euphausia superba) hotspot: population characteristics, abundance and vertical structure explored from a krill fishing vessel

Distribution, abundance and vertical migration pattern of krill - Euphausia superba Dana at fishing area 58 of the Indian Ocean sector of Southern Ocean

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An Antarctic krill (Euphausia superba) hotspot: population characteristics, abundance and vertical structure explored from a krill fishing vessel