Daytime surface swarming by Meganyctiphanes norvegica (M. Sars) (Crustacea, Euphausiacea) off Brier Island, Bay of Fundy
In July–September the euphausiid Meganyctiphanes norvegica (M. Sars) swarms at the surface in daytime off Brier Island, Nova Scotia (ca. 44°15′ N 66°23′ W). Systematic observations of swarming were made, mainly in late August 1974, 1975, 1976, and 1978, supplemented in 1974 and 1975 by the frequency...
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Canadian Science Publishing
1979
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Online Access: | http://dx.doi.org/10.1139/z79-297 http://www.nrcresearchpress.com/doi/pdf/10.1139/z79-297 |
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crcansciencepubl:10.1139/z79-297 2023-12-17T10:33:19+01:00 Daytime surface swarming by Meganyctiphanes norvegica (M. Sars) (Crustacea, Euphausiacea) off Brier Island, Bay of Fundy Brown, R. G.B. Barker, S. P. Gaskin, D. E. 1979 http://dx.doi.org/10.1139/z79-297 http://www.nrcresearchpress.com/doi/pdf/10.1139/z79-297 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 57, issue 12, page 2285-2291 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1979 crcansciencepubl https://doi.org/10.1139/z79-297 2023-11-19T13:39:13Z In July–September the euphausiid Meganyctiphanes norvegica (M. Sars) swarms at the surface in daytime off Brier Island, Nova Scotia (ca. 44°15′ N 66°23′ W). Systematic observations of swarming were made, mainly in late August 1974, 1975, 1976, and 1978, supplemented in 1974 and 1975 by the frequency of occurrence of the euphatisiids in the proventriculi of collected greater shearwaters, Puffinus gravis (O'Reilly). Swarms, consisting mostly of immature animals, occurred near an area of turbulence where strong tidal streams ran up against steep underwater ledges, bringing cool subsurface water and also copepods to the surface. Swarming was apparently not an attempt to avoid underwater predators or unfavourable oceanographic conditions, nor was it a means of advancing gonad maturation through exposure to solar irradiation. Swarming was most common in spring tide periods when tidal streams were strongest, and did not occur at all during a neap tide period in late August 1975. It is suggested that M. norvegica swarms were transported passively to the surface by strong vertical turbulence. However, the possibility that they swam actively to the surface in search of copepods and other food passively transported in that way could not be ruled out. It is suggested that the surface swarming of Euphausia pacifica Hansen, the other well-documented survey of the phenomenon, by Y. Komaki in 1967, be reexamined in the light of these conclusions. The significance of surface swarms as food sources for a variety of marine predators is discussed. Article in Journal/Newspaper Meganyctiphanes norvegica Copepods Canadian Science Publishing (via Crossref) Island Bay ENVELOPE(-109.085,-109.085,59.534,59.534) Canadian Journal of Zoology 57 12 2285 2291 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Brown, R. G.B. Barker, S. P. Gaskin, D. E. Daytime surface swarming by Meganyctiphanes norvegica (M. Sars) (Crustacea, Euphausiacea) off Brier Island, Bay of Fundy |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
In July–September the euphausiid Meganyctiphanes norvegica (M. Sars) swarms at the surface in daytime off Brier Island, Nova Scotia (ca. 44°15′ N 66°23′ W). Systematic observations of swarming were made, mainly in late August 1974, 1975, 1976, and 1978, supplemented in 1974 and 1975 by the frequency of occurrence of the euphatisiids in the proventriculi of collected greater shearwaters, Puffinus gravis (O'Reilly). Swarms, consisting mostly of immature animals, occurred near an area of turbulence where strong tidal streams ran up against steep underwater ledges, bringing cool subsurface water and also copepods to the surface. Swarming was apparently not an attempt to avoid underwater predators or unfavourable oceanographic conditions, nor was it a means of advancing gonad maturation through exposure to solar irradiation. Swarming was most common in spring tide periods when tidal streams were strongest, and did not occur at all during a neap tide period in late August 1975. It is suggested that M. norvegica swarms were transported passively to the surface by strong vertical turbulence. However, the possibility that they swam actively to the surface in search of copepods and other food passively transported in that way could not be ruled out. It is suggested that the surface swarming of Euphausia pacifica Hansen, the other well-documented survey of the phenomenon, by Y. Komaki in 1967, be reexamined in the light of these conclusions. The significance of surface swarms as food sources for a variety of marine predators is discussed. |
format |
Article in Journal/Newspaper |
author |
Brown, R. G.B. Barker, S. P. Gaskin, D. E. |
author_facet |
Brown, R. G.B. Barker, S. P. Gaskin, D. E. |
author_sort |
Brown, R. G.B. |
title |
Daytime surface swarming by Meganyctiphanes norvegica (M. Sars) (Crustacea, Euphausiacea) off Brier Island, Bay of Fundy |
title_short |
Daytime surface swarming by Meganyctiphanes norvegica (M. Sars) (Crustacea, Euphausiacea) off Brier Island, Bay of Fundy |
title_full |
Daytime surface swarming by Meganyctiphanes norvegica (M. Sars) (Crustacea, Euphausiacea) off Brier Island, Bay of Fundy |
title_fullStr |
Daytime surface swarming by Meganyctiphanes norvegica (M. Sars) (Crustacea, Euphausiacea) off Brier Island, Bay of Fundy |
title_full_unstemmed |
Daytime surface swarming by Meganyctiphanes norvegica (M. Sars) (Crustacea, Euphausiacea) off Brier Island, Bay of Fundy |
title_sort |
daytime surface swarming by meganyctiphanes norvegica (m. sars) (crustacea, euphausiacea) off brier island, bay of fundy |
publisher |
Canadian Science Publishing |
publishDate |
1979 |
url |
http://dx.doi.org/10.1139/z79-297 http://www.nrcresearchpress.com/doi/pdf/10.1139/z79-297 |
long_lat |
ENVELOPE(-109.085,-109.085,59.534,59.534) |
geographic |
Island Bay |
geographic_facet |
Island Bay |
genre |
Meganyctiphanes norvegica Copepods |
genre_facet |
Meganyctiphanes norvegica Copepods |
op_source |
Canadian Journal of Zoology volume 57, issue 12, page 2285-2291 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z79-297 |
container_title |
Canadian Journal of Zoology |
container_volume |
57 |
container_issue |
12 |
container_start_page |
2285 |
op_container_end_page |
2291 |
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1785587273011560448 |