Driving-forces for Greenland Offshore Groundfish Assemblages: Interplay of Climate, Ocean Productivity and Fisheries
Principal component analysis of German survey data from 1981 to 2006 yielded four main trend components accounting for 60 % of variance of the demersal fish assemblage on the Greenland shelf. The leading principal component (prin1) accounted for 22.5 % of total variance of abundance and was positive...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.602.6524 2023-05-15T15:27:03+02:00 Driving-forces for Greenland Offshore Groundfish Assemblages: Interplay of Climate, Ocean Productivity and Fisheries Heino O. Fock The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.602.6524 http://journal.nafo.int/39/fock/7-fock.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.602.6524 http://journal.nafo.int/39/fock/7-fock.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://journal.nafo.int/39/fock/7-fock.pdf Key words American plaice Atlantic cod Atlantic wolffish climate PCA productivity redfish text ftciteseerx 2016-01-08T14:06:31Z Principal component analysis of German survey data from 1981 to 2006 yielded four main trend components accounting for 60 % of variance of the demersal fish assemblage on the Greenland shelf. The leading principal component (prin1) accounted for 22.5 % of total variance of abundance and was positively correlated with deep-sea and golden redfish>17 cm (Sebastes mentella and S. marinus, respectively). Prin2 accounted for 16.7 % of total variance of abundance and was corre-lated to juvenile redfish <17 cm. Prin3 and prin4 accounted for 12.9 % and 7.5 % of total variance, respectively. American plaice (Hippoglossoides platessoides) was attributed to prin3. Atlantic cod (Gadus morhua) was almost equally assigned to prin3 and prin4. Prin1 and prin4 were significantly correlated with air temperature anomalies from Nuuk (p <0.01), representing the climate effect on the demersal assemblage. Prin2 and prin3 were significantly correlated with the July–August phy-toplankton colour index for East Greenland representing ocean productivity and fishing mortality from cod VPA analysis, the latter indicating fishing pressure effects on the ecosystem. About 30 % of total variance can be explained by climate. For East Greenland, strong bottom-up forcing (climate, productivity) and effects of fisheries were identified, whereas for West Greenland both bottom-up (climate) and top-down forcing (community interactions) were effective. With respect to Atlantic cod, fisheries in the case of prin3 and climate in the case of prin4 were equally important to explain long-term dynamics. Text atlantic cod East Greenland Gadus morhua golden redfish Greenland Nuuk Sebastes mentella Unknown Greenland Nuuk ENVELOPE(-52.150,-52.150,68.717,68.717) |
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Key words American plaice Atlantic cod Atlantic wolffish climate PCA productivity redfish |
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Key words American plaice Atlantic cod Atlantic wolffish climate PCA productivity redfish Heino O. Fock Driving-forces for Greenland Offshore Groundfish Assemblages: Interplay of Climate, Ocean Productivity and Fisheries |
topic_facet |
Key words American plaice Atlantic cod Atlantic wolffish climate PCA productivity redfish |
description |
Principal component analysis of German survey data from 1981 to 2006 yielded four main trend components accounting for 60 % of variance of the demersal fish assemblage on the Greenland shelf. The leading principal component (prin1) accounted for 22.5 % of total variance of abundance and was positively correlated with deep-sea and golden redfish>17 cm (Sebastes mentella and S. marinus, respectively). Prin2 accounted for 16.7 % of total variance of abundance and was corre-lated to juvenile redfish <17 cm. Prin3 and prin4 accounted for 12.9 % and 7.5 % of total variance, respectively. American plaice (Hippoglossoides platessoides) was attributed to prin3. Atlantic cod (Gadus morhua) was almost equally assigned to prin3 and prin4. Prin1 and prin4 were significantly correlated with air temperature anomalies from Nuuk (p <0.01), representing the climate effect on the demersal assemblage. Prin2 and prin3 were significantly correlated with the July–August phy-toplankton colour index for East Greenland representing ocean productivity and fishing mortality from cod VPA analysis, the latter indicating fishing pressure effects on the ecosystem. About 30 % of total variance can be explained by climate. For East Greenland, strong bottom-up forcing (climate, productivity) and effects of fisheries were identified, whereas for West Greenland both bottom-up (climate) and top-down forcing (community interactions) were effective. With respect to Atlantic cod, fisheries in the case of prin3 and climate in the case of prin4 were equally important to explain long-term dynamics. |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Heino O. Fock |
author_facet |
Heino O. Fock |
author_sort |
Heino O. Fock |
title |
Driving-forces for Greenland Offshore Groundfish Assemblages: Interplay of Climate, Ocean Productivity and Fisheries |
title_short |
Driving-forces for Greenland Offshore Groundfish Assemblages: Interplay of Climate, Ocean Productivity and Fisheries |
title_full |
Driving-forces for Greenland Offshore Groundfish Assemblages: Interplay of Climate, Ocean Productivity and Fisheries |
title_fullStr |
Driving-forces for Greenland Offshore Groundfish Assemblages: Interplay of Climate, Ocean Productivity and Fisheries |
title_full_unstemmed |
Driving-forces for Greenland Offshore Groundfish Assemblages: Interplay of Climate, Ocean Productivity and Fisheries |
title_sort |
driving-forces for greenland offshore groundfish assemblages: interplay of climate, ocean productivity and fisheries |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.602.6524 http://journal.nafo.int/39/fock/7-fock.pdf |
long_lat |
ENVELOPE(-52.150,-52.150,68.717,68.717) |
geographic |
Greenland Nuuk |
geographic_facet |
Greenland Nuuk |
genre |
atlantic cod East Greenland Gadus morhua golden redfish Greenland Nuuk Sebastes mentella |
genre_facet |
atlantic cod East Greenland Gadus morhua golden redfish Greenland Nuuk Sebastes mentella |
op_source |
http://journal.nafo.int/39/fock/7-fock.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.602.6524 http://journal.nafo.int/39/fock/7-fock.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766357510070992896 |