Spatial patterns of age-0 cod survival in the Barents Sea
Apart from human harvest, recruitment dynamics is conceivably recognized as the main source of population variability of marine fish stocks. Factors affecting recruitment dynamics can change over both temporal and spatial scales. It follows that at the same time, over the entire range of distributio...
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ftimr:oai:imr.brage.unit.no:11250/100647 2023-05-15T15:17:35+02:00 Spatial patterns of age-0 cod survival in the Barents Sea Ciannelli, Lorenzo Dingsør, Gjert Endre Bogstad, Bjarte Ottersen, Geir Chan, Kung-Sik Gjøsæter, Harald Stenseth, Nils Christian 2005 1821813 bytes application/pdf http://hdl.handle.net/11250/100647 eng eng ICES ICES CM documents 2005/AA:11 http://hdl.handle.net/11250/100647 13 s. cod torsk capelin lodde 0-gruppe 0-group VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Working paper 2005 ftimr 2021-09-23T20:14:51Z Apart from human harvest, recruitment dynamics is conceivably recognized as the main source of population variability of marine fish stocks. Factors affecting recruitment dynamics can change over both temporal and spatial scales. It follows that at the same time, over the entire range of distribution of a single population, different individuals may experience different level of environmental forcing and survival, which may not be well represented by average conditions throughout the entire distribution range. In this study we focus on the spatial pattern and its relative sources of variability in the survival of the Arcto-Norwegian cod (Gadus morhua L.) from the age-0 to the age-1 stage. This is a delicate phase of the cod pre-recruitment dynamics, as individuals are confronted with a suite of survival challenges, such as settlement, pre-winter body condition, growth, and predation avoidance. During the over 20 years analyzed (1980-2004), we found that on average age-0 cod experience lower survival in the areas north of the Norwegian coastline, from about 71 to 75 degree of latitude north and about 20 to 35 degree of longitude east. However, in coastal areas, immediately north of the Norwegian coastline, age-0 cod experience greater survival. Within the studied area, the average survival of age-0 cod is significantly greater during years with low adult cod and high capelin abundance, and high Arctic Oscillation. In addition, when capelin abundance is high, age-0 cod experience better survival particularly near the Norwegian coastline. Based on these results it appears that within the sampled grid the observed geographic patterns of age-0 cod survival is affected by the predation from adult cod in relation to the availability and distribution of capelin (Mallotus villosus), the alternative and preferred prey of adult cod. Climate can affect the spatial survival of age-0 cod by both affecting the distribution of their predators (e.g., adult cod) and the distribution and availability of zooplankton prey. Report Arctic Barents Sea Gadus morhua Zooplankton Institute for Marine Research: Brage IMR Arctic Barents Sea |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
cod torsk capelin lodde 0-gruppe 0-group VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
spellingShingle |
cod torsk capelin lodde 0-gruppe 0-group VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Ciannelli, Lorenzo Dingsør, Gjert Endre Bogstad, Bjarte Ottersen, Geir Chan, Kung-Sik Gjøsæter, Harald Stenseth, Nils Christian Spatial patterns of age-0 cod survival in the Barents Sea |
topic_facet |
cod torsk capelin lodde 0-gruppe 0-group VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
description |
Apart from human harvest, recruitment dynamics is conceivably recognized as the main source of population variability of marine fish stocks. Factors affecting recruitment dynamics can change over both temporal and spatial scales. It follows that at the same time, over the entire range of distribution of a single population, different individuals may experience different level of environmental forcing and survival, which may not be well represented by average conditions throughout the entire distribution range. In this study we focus on the spatial pattern and its relative sources of variability in the survival of the Arcto-Norwegian cod (Gadus morhua L.) from the age-0 to the age-1 stage. This is a delicate phase of the cod pre-recruitment dynamics, as individuals are confronted with a suite of survival challenges, such as settlement, pre-winter body condition, growth, and predation avoidance. During the over 20 years analyzed (1980-2004), we found that on average age-0 cod experience lower survival in the areas north of the Norwegian coastline, from about 71 to 75 degree of latitude north and about 20 to 35 degree of longitude east. However, in coastal areas, immediately north of the Norwegian coastline, age-0 cod experience greater survival. Within the studied area, the average survival of age-0 cod is significantly greater during years with low adult cod and high capelin abundance, and high Arctic Oscillation. In addition, when capelin abundance is high, age-0 cod experience better survival particularly near the Norwegian coastline. Based on these results it appears that within the sampled grid the observed geographic patterns of age-0 cod survival is affected by the predation from adult cod in relation to the availability and distribution of capelin (Mallotus villosus), the alternative and preferred prey of adult cod. Climate can affect the spatial survival of age-0 cod by both affecting the distribution of their predators (e.g., adult cod) and the distribution and availability of zooplankton prey. |
format |
Report |
author |
Ciannelli, Lorenzo Dingsør, Gjert Endre Bogstad, Bjarte Ottersen, Geir Chan, Kung-Sik Gjøsæter, Harald Stenseth, Nils Christian |
author_facet |
Ciannelli, Lorenzo Dingsør, Gjert Endre Bogstad, Bjarte Ottersen, Geir Chan, Kung-Sik Gjøsæter, Harald Stenseth, Nils Christian |
author_sort |
Ciannelli, Lorenzo |
title |
Spatial patterns of age-0 cod survival in the Barents Sea |
title_short |
Spatial patterns of age-0 cod survival in the Barents Sea |
title_full |
Spatial patterns of age-0 cod survival in the Barents Sea |
title_fullStr |
Spatial patterns of age-0 cod survival in the Barents Sea |
title_full_unstemmed |
Spatial patterns of age-0 cod survival in the Barents Sea |
title_sort |
spatial patterns of age-0 cod survival in the barents sea |
publisher |
ICES |
publishDate |
2005 |
url |
http://hdl.handle.net/11250/100647 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic Barents Sea Gadus morhua Zooplankton |
genre_facet |
Arctic Barents Sea Gadus morhua Zooplankton |
op_source |
13 s. |
op_relation |
ICES CM documents 2005/AA:11 http://hdl.handle.net/11250/100647 |
_version_ |
1766347820899500032 |