Erratum to: Long-term changes in Krill biomass and distribution in the Barents Sea: are the changes mainly related to capelin stock size and temperature conditions?

In 1960th, red king crab was intentionally introduced into the Barents Sea. This species has formed a new self-sustaining population. In Russian waters, the commercial fishery of red king crab was started in 2004. Non-indigenous status and high commercial value of the crab have led to growing interest in the study of its biology and ecology. Red king crab has been intensively studied by specialists of Murmansk Marine Biological Institute to evaluate the role of this crab in local benthic communities and provide a theoretic basis and important applications for fishery science. New data on the population dynamics, symbiotic relationships, feeding and reproduction of red king crab have been obtained from long-term studies in coastal waters of the Barents Sea. Significant results of these studies are presented in this review.

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Long-term changes in trophic patterns of Iceland cod and linkages to main prey stock sizes

ICES Journal of Marine Science ◽

10.1093/icesjms/fsr057 ◽

2011 ◽

Vol 68 (7) ◽

pp. 1488-1499 ◽

Cited By ~ 21

Author(s):

Ólafur K. Pálsson ◽

Höskuldur Björnsson

Keyword(s):

Gadus Morhua ◽

Atlantic Water ◽

Type I ◽

Feeding Response ◽

Total Consumption ◽

Stock Size ◽

Main Prey ◽

Northern Shrimp ◽

Long Term Changes

Abstract Pálsson, Ó. K., and Björnsson, H. 2011. Long-term changes in trophic patterns of Iceland cod and linkages to main prey stock sizes. – ICES Journal of Marine Science, 68: 1488–1499. Data on the diet composition of Iceland cod (Gadus morhua) were collected in March of the years 1981–2010 and in autumn of the years 1988–2010. Capelin, northern shrimp, and euphausiids dominate the diet in all years and may be classified as the stable food of Iceland cod. Overall, total consumption by the smallest cod (20–29 cm) remained stable over the three decades, whereas that of larger fish has declined since the mid-1990s. This decline may explain the reduced growth rate of cod in recent years. Long-term, prey-specific patterns were identified in consumption, and significant trophic links were found between cod consumption and stock sizes of capelin and northern shrimp. In March, the correlation between cod consumption on capelin and capelin stock size was highly significant, a type I functional feeding response, but not significant in autumn. The correlation deteriorated in the early to mid-1990s and in the early 2000s. Increased inflow of Atlantic water into north Icelandic waters, and associated changes in capelin distribution, may have contributed to this trend. The interaction between cod consumption on northern shrimp and shrimp stock size showed a highly significant type I functional feeding response in both seasons.

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Temperature conditions of development juvenile NEA cod in the Barents sea for 1998-2015 on the basis of satellite data

10.5194/egusphere-egu2020-1350 ◽

2020 ◽

Author(s):

George Vanyushin ◽

Tatyana Bulatova

Keyword(s):

Life Cycle ◽

Surface Temperature ◽

Sea Surface Temperature ◽

Satellite Data ◽

Barents Sea ◽

Sea Surface ◽

Arctic Cod ◽

Norwegian Sea ◽

Temperature Conditions ◽

The Barents Sea

Temperature conditions of development juvenile NEA cod in the Barents sea for 1998-2015 on the basis of satellite dataVanyushin G. P., Bulatova T. V.Russian Federal Research Institute of Fisheries and Oceanography (VNIRO)107140 17, V. Krasnoselskaya str., Moscowtel: 8(499)264-01-33, fax: 8(499)264-91-87,e-mail: [email protected]&#160;AbstractThe paper considers the real temperature conditions in the main spawning area of North-East Arctic cod in the Norwegian sea and the development of its juveniles in the Barents sea in the periods from March to October 1998-2015. Here was taken as a principle the analysis of materials Bank mean weekly maps of sea surface temperature (SST) built on complex process: infrared digital data from metrological satellites of the series "NOAA" and quasisynchronous temperature data "in situ" from ships, buoys and coastal stations. A continuous series of indicators on temperature variability in the surface layer of sea water in coastal zone of the Norwegian sea during spawning periods and later on during the early ontogenesis of juvenile cod in the Barents sea &#160;allowed to establish the dynamics of interannual seasonal temperature trends on a mesoscale period of time (1998-2015). This made it possible to assess the indirect impact of temperature conditions on the prospect of survival and, accordingly, the number of juvenile cod in the first year of its life after spawning &#8211; the most important stage in the life cycle of a new generation of cod. The paper presents calculations of monthly and seasonal average values of SST and SST anomalies in the Norwegian and Barents seas, shows the interannual seasonal dynamics of these characteristics. Given for these years, the results of the comparative analysis between: seasonal values of temperature in the water surrounding the Lofoten Islands (March-April &#8211; time of the main spawning) and in the water of the Barents sea (May-October - time of the early onthogenesis of juvenile cod) and professional expert estimates the number of yearlings cod. The relationship between these statistical data was positive and about equal to R= + 0,67. Information on the number of generations of cod at different stages of its life cycle was taken from the annual reports of the Arctic Fisheries Working Group ICES.Keywords: satellite monitoring, sea surface temperature (SST), the&#160; Northeast Arctic cod, main spawning and habitat waters, yearlings of the cod.

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The Long-Term Monitoring of Bird Populations on Kolguev Island in the Barents Sea

ARCTIC ◽

10.14430/arctic73845 ◽

2021 ◽

Vol 74 (5) ◽

pp. 23-40

Author(s):

Petr M. Glazov ◽

Julia A. Loshchagina ◽

Alexander V. Kondratyev ◽

Elmira M. Zaynagutdinova ◽

Helmut Kruckenberg ◽

...

Keyword(s):

Barents Sea ◽

Bird Species ◽

Breeding Density ◽

Southeastern Part ◽

Barnacle Goose ◽

The Barents Sea ◽

Long Term Monitoring ◽

Term Monitoring ◽

Kolguev Island

Kolguev Island (69˚05′ N 49˚15′ E) is located in the Pechora Sea, the southeastern part of the Barents Sea. The island’s ecosystem is unusual due to the total absence of rodents and specialized predators such as weasels, while non-specialized predators such as Arctic (Vulpes lagopus) and red (V. vulpes) foxes and Rough-legged Hawk (Buteo lagopus) are common. Currently, 111 bird species have been registered here, of which 58 are nesting. The absence of rodents and the relatively stable predation pressure have resulted in the high abundance of many bird species: Willow Ptarmigan (Lagopus lagopus), several goose species, some waders, and passerines. Over the 125-year history of ornithological studies on Kolguev, the island avifauna has changed significantly. The trend of an increase in the proportion of widespread and Siberian species together with a decrease in the proportion of Arctic species was observed. Since 2006, a thorough monitoring of Kolguev avifauna has been carried out, during which the dynamics of the bird population densities have been traced. The abundance of Black-bellied Plover (Pluvialis squatarola) and Dunlin (Calidris alpina) decreased, while the numbers of Barnacle Goose (Branta leucopsis) have increased sharply since the 1980s. The breeding density of Rough-legged Hawk has also increased in recent years. The long-term monitoring of Kolguev ecosystems has indicated the high international conservation value of the island due to the high breeding density of many bird species. Our study, covering more than a century of avifaunal studies with almost annual monitoring over the past three decades, provides an unusually long and detailed time-series for an Arctic island.

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Zoobentos of the Barents sea

10.29006/978-5-6045110-0-8/(27) ◽

2021 ◽

pp. 352-369

Author(s):

N.V. Denisenko ◽

◽

S.G. Denisenko ◽

Keyword(s):

Species Richness ◽

Trophic Structure ◽

Barents Sea ◽

Negative Impact ◽

Benthic Fauna ◽

Bottom Fauna ◽

Bottom Trawling ◽

The Barents Sea

Аннотация на английском языке: Based on the analysis of retrospective and recent materials, the species richness of the bottom fauna and the long-term variability of the quantitative characteristics of zoobenthos of the Barents Sea are considered. The role of key taxa in the formation of benthic biomass and its trophic structure is indicated. The negative impact of bottom trawling on benthic fauna is shown and the most vulnerable areas in the basin are identified.

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Fisheries change spawning ground distribution of northeast Arctic cod

Biology Letters ◽

10.1098/rsbl.2009.0789 ◽

2009 ◽

Vol 6 (2) ◽

pp. 261-264 ◽

Cited By ~ 38

Author(s):

Anders Frugård Opdal

Keyword(s):

Barents Sea ◽

Size Structure ◽

Sudden Increase ◽

Spawning Grounds ◽

Norwegian Coast ◽

Trawl Fishery ◽

Climatic Variations ◽

The Barents Sea ◽

Spawning Stock

Prior to the 1920s, the northeast Arctic (NA) cod were caught at spawning grounds ranging from the southernmost to the northernmost parts of the Norwegian coast, but have for the last 50 yr mainly been caught around the Lofoten archipelago and northwards. The NA cod have their feeding and nursery grounds in the Barents Sea, and migrate south towards the Norwegian coast in the winter to spawn. This study uses commercial fisheries' data from landing ports along the entire Norwegian coast during the period 1866–1969 as evidence of long-term truncation and northerly shift of spawning grounds. Nearly all spawning grounds south of Lofoten have been abandoned, while an increasing proportion of the spawning stock only uses the northernmost areas of the Norwegian coast, Troms and Finnmark. The truncation can hardly be attributed to long-term climatic variations, but may result from an intensive size-selective trawl fishery in the Barents Sea causing a sudden increase in fishing mortality, probably altering the size structure and migratory capacity of the stock.

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