Vertical migration behaviour in the northern krill Meganyctiphanes norvegica is influenced by moult and reproductive processes
A population of the northern krill Meganyctiphanes norvegica was sampled between 24 July and 3 August 1998 in the Alkor Deep, Kattegat, in order to investigate the influence of sexual and developmental factors on the vertical distribution of adult krill. Depth-discrete samples of krill were taken wi...
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ftuhipublicatio:oai:pure.atira.dk:publications/70949729-814b-4f00-9534-dc3588f62cce 2023-05-15T13:47:28+02:00 Vertical migration behaviour in the northern krill Meganyctiphanes norvegica is influenced by moult and reproductive processes Tarling, Geraint A Cuzin-Roudy, J Buchholz, F 1999 https://pure.uhi.ac.uk/portal/en/publications/vertical-migration-behaviour-in-the-northern-krill-meganyctiphanes-norvegica-is-influenced-by-moult-and-reproductive-processes(70949729-814b-4f00-9534-dc3588f62cce).html eng eng info:eu-repo/semantics/restrictedAccess Tarling , G A , Cuzin-Roudy , J & Buchholz , F 1999 , ' Vertical migration behaviour in the northern krill Meganyctiphanes norvegica is influenced by moult and reproductive processes ' , MAR ECOL-PROG SER , no. 0 , pp. 253-262 . CRUSTACEA Marine & Freshwater Biology MOLT CYCLE Oceanography ANTARCTIC KRILL SWARMS Ecology KATTEGAT EUPHAUSIA-SUPERBA SAMPLING ZOOPLANKTON ATLANTIC GROWTH POPULATION article 1999 ftuhipublicatio 2021-08-09T06:16:23Z A population of the northern krill Meganyctiphanes norvegica was sampled between 24 July and 3 August 1998 in the Alkor Deep, Kattegat, in order to investigate the influence of sexual and developmental factors on the vertical distribution of adult krill. Depth-discrete samples of krill were taken with a 1 m(2) MOCNESS net at the cardinal times of day (midnight, midday, sunrise and sunset). Specimens were immediately measured and categorised for moulting and spawning status. Further samples were preserved for detailed analysis in the home laboratory. Results showed that the population concentrated in the deep (80 to 100 m) during day-time but segregated vertically during nighttime. Moulting occurred in the deep during night-time, away from the main part of the non-moulting population, which was located between 80 and 50 m. Spawning females were most evident in the up permost depth interval (30 to 5 m). Moulting at night in the deepest layers may be viewed as a mechanism to avoid cannibalism whilst in a vulnerable condition. Spawning in the warm upper layers accelerates reproductive processes and may also reduce the depth to which the eggs sink before hatching into nauplii. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Meganyctiphanes norvegica Northern krill University of the Highlands and Islands: Research Database of UHI Antarctic Kattegat ENVELOPE(9.692,9.692,63.563,63.563) |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
CRUSTACEA Marine & Freshwater Biology MOLT CYCLE Oceanography ANTARCTIC KRILL SWARMS Ecology KATTEGAT EUPHAUSIA-SUPERBA SAMPLING ZOOPLANKTON ATLANTIC GROWTH POPULATION |
spellingShingle |
CRUSTACEA Marine & Freshwater Biology MOLT CYCLE Oceanography ANTARCTIC KRILL SWARMS Ecology KATTEGAT EUPHAUSIA-SUPERBA SAMPLING ZOOPLANKTON ATLANTIC GROWTH POPULATION Tarling, Geraint A Cuzin-Roudy, J Buchholz, F Vertical migration behaviour in the northern krill Meganyctiphanes norvegica is influenced by moult and reproductive processes |
topic_facet |
CRUSTACEA Marine & Freshwater Biology MOLT CYCLE Oceanography ANTARCTIC KRILL SWARMS Ecology KATTEGAT EUPHAUSIA-SUPERBA SAMPLING ZOOPLANKTON ATLANTIC GROWTH POPULATION |
description |
A population of the northern krill Meganyctiphanes norvegica was sampled between 24 July and 3 August 1998 in the Alkor Deep, Kattegat, in order to investigate the influence of sexual and developmental factors on the vertical distribution of adult krill. Depth-discrete samples of krill were taken with a 1 m(2) MOCNESS net at the cardinal times of day (midnight, midday, sunrise and sunset). Specimens were immediately measured and categorised for moulting and spawning status. Further samples were preserved for detailed analysis in the home laboratory. Results showed that the population concentrated in the deep (80 to 100 m) during day-time but segregated vertically during nighttime. Moulting occurred in the deep during night-time, away from the main part of the non-moulting population, which was located between 80 and 50 m. Spawning females were most evident in the up permost depth interval (30 to 5 m). Moulting at night in the deepest layers may be viewed as a mechanism to avoid cannibalism whilst in a vulnerable condition. Spawning in the warm upper layers accelerates reproductive processes and may also reduce the depth to which the eggs sink before hatching into nauplii. |
format |
Article in Journal/Newspaper |
author |
Tarling, Geraint A Cuzin-Roudy, J Buchholz, F |
author_facet |
Tarling, Geraint A Cuzin-Roudy, J Buchholz, F |
author_sort |
Tarling, Geraint A |
title |
Vertical migration behaviour in the northern krill Meganyctiphanes norvegica is influenced by moult and reproductive processes |
title_short |
Vertical migration behaviour in the northern krill Meganyctiphanes norvegica is influenced by moult and reproductive processes |
title_full |
Vertical migration behaviour in the northern krill Meganyctiphanes norvegica is influenced by moult and reproductive processes |
title_fullStr |
Vertical migration behaviour in the northern krill Meganyctiphanes norvegica is influenced by moult and reproductive processes |
title_full_unstemmed |
Vertical migration behaviour in the northern krill Meganyctiphanes norvegica is influenced by moult and reproductive processes |
title_sort |
vertical migration behaviour in the northern krill meganyctiphanes norvegica is influenced by moult and reproductive processes |
publishDate |
1999 |
url |
https://pure.uhi.ac.uk/portal/en/publications/vertical-migration-behaviour-in-the-northern-krill-meganyctiphanes-norvegica-is-influenced-by-moult-and-reproductive-processes(70949729-814b-4f00-9534-dc3588f62cce).html |
long_lat |
ENVELOPE(9.692,9.692,63.563,63.563) |
geographic |
Antarctic Kattegat |
geographic_facet |
Antarctic Kattegat |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Meganyctiphanes norvegica Northern krill |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Meganyctiphanes norvegica Northern krill |
op_source |
Tarling , G A , Cuzin-Roudy , J & Buchholz , F 1999 , ' Vertical migration behaviour in the northern krill Meganyctiphanes norvegica is influenced by moult and reproductive processes ' , MAR ECOL-PROG SER , no. 0 , pp. 253-262 . |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1766247194280591360 |