Differences between near bottom biomass spatial structure observed in the Irish Sea, the North Sea and the Barents Sea in recent years
Based on acoustic data and trawl catches collected during bottom trawl surveys, we compare the spatial structure of the biomass available in the first meters above the bottom in three different regions, the Barents Sea (1997-2002), the North Sea (1999-2003) and the Irish Sea (1997-2002). The objecti...
Main Authors: | , , , , , , , , , , , , , |
---|---|
Format: | Report |
Language: | English |
Published: |
ICES
2003
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/100561 |
id |
ftimr:oai:imr.brage.unit.no:11250/100561 |
---|---|
record_format |
openpolar |
spelling |
ftimr:oai:imr.brage.unit.no:11250/100561 2023-05-15T15:38:30+02:00 Differences between near bottom biomass spatial structure observed in the Irish Sea, the North Sea and the Barents Sea in recent years Mireille, Bouleau Nicolas, Bez Hjellvik, Vidar Godø, Olav Rune Reid, David Beare, Douglas Greig, Tony Armstrong, Mike Gerritsen, Hans D. Mackinson, Steven Neville, Suzanna Kooij, Jeroen van der Vérin, Yves Massé, Jacques 2003 2513374 bytes application/pdf http://hdl.handle.net/11250/100561 eng eng ICES ICES CM documents 2003/Q:17 http://hdl.handle.net/11250/100561 19 s. biomass biomasse VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 Working paper 2003 ftimr 2021-09-23T20:15:13Z Based on acoustic data and trawl catches collected during bottom trawl surveys, we compare the spatial structure of the biomass available in the first meters above the bottom in three different regions, the Barents Sea (1997-2002), the North Sea (1999-2003) and the Irish Sea (1997-2002). The objective was to compare areas with different levels of resource. Conclusions are conditioned to the number of samples available in each respective study area (large for Barents Sea, medium for the North Sea and small for the Irish Sea). This analysis combines acoustic and trawl data. The acoustic data were used to improve the knowledge of catch data spatial structure. Most of the time, hauls are too far to be correlated. Acoustic data could allow to take account spatial structures with shorter range since they are collected along the vessel track. The acoustic information can improve the accuracy in the catch spatial structures analysis. Two groups of species are distinguished: pelagic fish and demersal fish. Spatial structures are observed in the Barents Sea made of small scale heterogeneities and large scale structures of 300 nautical miles. Such a structure is consistent through time (i.e. from 1997 to 2002). Spatial patchiness is extremely important in the North Sea causing the classical geostatistical tools to be useless. Apart from the ecological interpretation of the density-dependency of spatial structures, we describe some possible ways to handle patchy distributions. Report Barents Sea Institute for Marine Research: Brage IMR Barents Sea |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
biomass biomasse VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 |
spellingShingle |
biomass biomasse VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 Mireille, Bouleau Nicolas, Bez Hjellvik, Vidar Godø, Olav Rune Reid, David Beare, Douglas Greig, Tony Armstrong, Mike Gerritsen, Hans D. Mackinson, Steven Neville, Suzanna Kooij, Jeroen van der Vérin, Yves Massé, Jacques Differences between near bottom biomass spatial structure observed in the Irish Sea, the North Sea and the Barents Sea in recent years |
topic_facet |
biomass biomasse VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 |
description |
Based on acoustic data and trawl catches collected during bottom trawl surveys, we compare the spatial structure of the biomass available in the first meters above the bottom in three different regions, the Barents Sea (1997-2002), the North Sea (1999-2003) and the Irish Sea (1997-2002). The objective was to compare areas with different levels of resource. Conclusions are conditioned to the number of samples available in each respective study area (large for Barents Sea, medium for the North Sea and small for the Irish Sea). This analysis combines acoustic and trawl data. The acoustic data were used to improve the knowledge of catch data spatial structure. Most of the time, hauls are too far to be correlated. Acoustic data could allow to take account spatial structures with shorter range since they are collected along the vessel track. The acoustic information can improve the accuracy in the catch spatial structures analysis. Two groups of species are distinguished: pelagic fish and demersal fish. Spatial structures are observed in the Barents Sea made of small scale heterogeneities and large scale structures of 300 nautical miles. Such a structure is consistent through time (i.e. from 1997 to 2002). Spatial patchiness is extremely important in the North Sea causing the classical geostatistical tools to be useless. Apart from the ecological interpretation of the density-dependency of spatial structures, we describe some possible ways to handle patchy distributions. |
format |
Report |
author |
Mireille, Bouleau Nicolas, Bez Hjellvik, Vidar Godø, Olav Rune Reid, David Beare, Douglas Greig, Tony Armstrong, Mike Gerritsen, Hans D. Mackinson, Steven Neville, Suzanna Kooij, Jeroen van der Vérin, Yves Massé, Jacques |
author_facet |
Mireille, Bouleau Nicolas, Bez Hjellvik, Vidar Godø, Olav Rune Reid, David Beare, Douglas Greig, Tony Armstrong, Mike Gerritsen, Hans D. Mackinson, Steven Neville, Suzanna Kooij, Jeroen van der Vérin, Yves Massé, Jacques |
author_sort |
Mireille, Bouleau |
title |
Differences between near bottom biomass spatial structure observed in the Irish Sea, the North Sea and the Barents Sea in recent years |
title_short |
Differences between near bottom biomass spatial structure observed in the Irish Sea, the North Sea and the Barents Sea in recent years |
title_full |
Differences between near bottom biomass spatial structure observed in the Irish Sea, the North Sea and the Barents Sea in recent years |
title_fullStr |
Differences between near bottom biomass spatial structure observed in the Irish Sea, the North Sea and the Barents Sea in recent years |
title_full_unstemmed |
Differences between near bottom biomass spatial structure observed in the Irish Sea, the North Sea and the Barents Sea in recent years |
title_sort |
differences between near bottom biomass spatial structure observed in the irish sea, the north sea and the barents sea in recent years |
publisher |
ICES |
publishDate |
2003 |
url |
http://hdl.handle.net/11250/100561 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_source |
19 s. |
op_relation |
ICES CM documents 2003/Q:17 http://hdl.handle.net/11250/100561 |
_version_ |
1766369473588101120 |