Age at first reproduction has declined markedly for Barents Sea cod over recent decades. In the 1940s, a cod typically reproduced for the first time when it was between 9 or 10 years old. In the 1990s, average age at first reproduction had declined to between 6 and 7 years. Reduced age at maturity may affect the reproductive capacity of the cod stock, and the cod’s role as an important top predator in the ecosystem. The possible explanation for the declining age at
The resilience of the Barents Sea ecosystem, even unexploited, may be low due to great climatic changes (Loeng and Drinkwater, 2007), variability in primary production and biomass/production of organisms at different trophic levels. Heavily exploited populations of top predators influence many lower trophic levels of the ecosystem. Overfishing of small pelagic fish, i.e. capelin, results in imbalance of energy flow passing to the higher trophic levels; this may have the similar strong consequences for the ecosystem as overfishing of top predators (Yaragina and Dolgov, 2009).
Although discarding is prohibited for fisheries conducted in the Barents Sea, inevitably some discarding does occur; the level of which is not reported. Hence, estimates of discard are not incorporated in fish stock assessments. Lack of discard estimates results in stock assessments which are less precise, less accurate, and less reliable. Hence, the impact of fisheries on the ecosystem is not fully understood. One possible approach to estimate the amount of discarded fish is to analyze landings data, i.e.,
Substantial removals make fishing the human activity that has the largest impact on fish stocks and functioning of the entire Barents Sea ecosystem. A fishery is not considered sustainable if it impairs recruitment potential of the stock. Single species management often focuses on measuring status of the fishery in relation to benchmarks called biological reference points (BRPs). BRPs for single species management are usually defined in terms of the fishing mortality rate (F) with target and limit reference points, and total- or spawning stock biomass (TSB or SSB).
The environmental risks of oil and gas development in the region have been evaluated several times, and is a key environmental question facing the region. The focus of the debate is the risk of an accidental oil-spill during exploration or production. The consequences of such a spill depend on the activity, the location, time and potential exposure of environmental valuable species and areas. One of the environmental risks from future oil production can be associated with potential activities, which might influence near-shore areas, especially in ecologically valuable areas like the Lofoten-Islands and Pechora Sea. In addition, the Polar Oceanographic Front and the Ice Edge zone are particular sensitive areas.
The issue of present and potential radioactive contamination in the marine environment has received considerable attention in Norway. The Norwegian marine monitoring programme (RAME) focuses on monitoring of radioactivity both in coastal areas and in the open sea. This programme also includes monitoring of discharges from Norwegian sources and collection of discharge data relevant for the long-range transport of radionuclides from various sources (NRPA, 2011).
Atmospheric transport is believed to be the most important transport route for volatile and semi-volatile POPs (persistent organic pollutants) into the Arctic (AMAP 2004). Monitoring POPs in the air at Zeppelin observatory (close to Ny Ålesund, Svalbard) has revealed low concentrations with stabile or declining trends. One exception is HCB (hexachlorobenzene) that has increased significantly since 2003 (Nizzetto, 2014).
Oil contamination might be measured as the total hydrocarbon content (THC) which includes both aliphatic and aromatic hydrocarbons (PAHs). PAHs play a significant role in the Barents Sea where hydrocarbon resources are naturally present. PAHs also originate from incomplete combustion processes of organic material, they travel long distances in the atmosphere, and are toxic to animals and humans. Hence, PAH-emission is still ongoing. Atmospheric transport has been demonstrated to be the main route for PAHs to reach pristine areas such as the Arctic.
Heavy metals have been part of the Norwegian national monitoring program since 1980. Monitoring heavy metals in air was initiated at Zeppelin Observatory in 1994 and at Andøya Observatory in 2010. In 2013, annual mean concentrations of most heavy metals except mercury, nickel, and vanadium were somewhat higher at Zeppelin than observed at Andøya. This was due to individual episodes with high concentrations of heavy metals at Zeppelin during winter in 2013 (Figure 4.4.12).
Vessel collisions or ship strikes may result in death or serious injury of marine mammals, i.e., massive trauma, hemorrhaging, broken bones, and propeller wounds. Collisions occur mainly with large whale species, small cetaceans (i.e., dolphins, narwhal, beluga), marine turtles, and sirenians (i.e., manatees, dugongs (Arctic Council, 2009).
Future shipping activities depend considerably on the expansion rate of the oil-and-gas related industry in the northern areas, which in turn depends on both regional and global economic developments. Global warming and a subsequent increase of ice-free shipping routes through Arctic waters could also significantly contribute to increase of shipping traffic.
Transport of crude oil and other petroleum products from ports and terminals in Northwest Russia through the Barents Sea has been increasing over the last decade. In 2002, about 5 million tons of Russian oil was exported along the North-Norwegian coastline, in 2004, the volume reached almost 12 million tons, but dropped the following year; during 2005 to 2013, levels of export ranged between 9 and 12 million tons per year. In a five-ten year perspective, the total
Aquaculture is a growing industry along the coasts of northern Norway and Russia; there are several commercial fish farms producing salmonids (salmon, and trout), white fish (mainly cod), and shellfish. Aquaculture is dominated by salmon and trout. Norwegian farmed Atlantic salmon accounts for over half of the world’s salmon supply. While landed catch has in general shown a declining trend, aquaculture production has increased steadily (FAO, 2013).
The Barents Sea ecosystem is driven by climate conditions and is highly susceptible to the effects of climate change; it is inherently a highly dynamic system. Human forces now present in the system and are already affecting environmental conditions. Within this unstable setting, a rapidly growing tourist industry is also producing change and exerting impacts. It is important to anticipate ways in which tourism will affect the environmental quality, cultural integrity, economic
Tourism is one of three focus areas for business in Svalbard, and has been so since the last White Paper Number 50 (1990-91) Næringstiltak på Svalbard (Measures for Economic development of Svalbard) was presented. Cruise tourism is a major part with high numbers of operators, vessels, and ships; the cruise tourism industry in Svalbard has increased considerably over the last 10-15 years transporting a large number of passengers. There are two types of vessels:
In December 2013, the Murmansk regional government decreed that the role of tourism in economic and socio-cultural development of the region should be increased. Cruise tourism is recognized as a key area for further development. To develop the infrastructure to ensure regular marine passenger transport, the “Arctic Harbor” investment project will be implemented. Within the project’s framework, a range of improvements are planned, including: reconstruction of