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The rate of change in Arctic marine environments in response to shifts driven by climate change threatens Arctic resilience. The growing recognition and visibility of these changes have scientific and social roots. Mitigating these consequences is therefore a social-scientific concern. Multiple scales, perspectives, and governance systems for Arctic marine environments, alongside receding climate and economic barriers to species movements and scientific research, create challenges and opportunities that differ in magnitude and breadth from marine invasions elsewhere. The receding barriers in the marine Arctic amplify the potential ecological and economic consequences from new species introductions and range expansions from adjacent biomes. While there is consensus that marine invasive species can cause severe damages to ecosystems and resource-dependent communities, which species pose what threats, and to whom, remain complex dynamic socioecological and biogeophysical economic questions. Decisions over prevention, detection, and monitoring along with institutional frameworks for cooperating and responding to threats also affect the expected severity of impacts. Technologies, and costs, for identifying and monitoring species compositions and risks are evolving, with novel research advances as well as increasingly sophisticated ecological-economic, environmental niche, and habitat suitability models. Despite advances in understanding drivers and dynamics of new species introductions, a dearth of baseline knowledge regarding Arctic marine invasions remains. Potential consequences extend beyond ecosystem changes and include legal, institutional, and social shifts. Studies on the red king and snow crab invasions in the Barents Sea from multiple disciplinary angles showcase complex social, economic, and ecological interconnections that are transforming communities and ecosystems.
The rate of change in Arctic marine environments in response to shifts driven by climate change threatens Arctic resilience. The growing recognition and visibility of these changes have scientific and social roots. Mitigating these consequences is therefore a social-scientific concern. Multiple scales, perspectives, and governance systems for Arctic marine environments, alongside receding climate and economic barriers to species movements and scientific research, create challenges and opportunities that differ in magnitude and breadth from marine invasions elsewhere. The receding barriers in the marine Arctic amplify the potential ecological and economic consequences from new species introductions and range expansions from adjacent biomes. While there is consensus that marine invasive species can cause severe damages to ecosystems and resource-dependent communities, which species pose what threats, and to whom, remain complex dynamic socioecological and biogeophysical economic questions. Decisions over prevention, detection, and monitoring along with institutional frameworks for cooperating and responding to threats also affect the expected severity of impacts. Technologies, and costs, for identifying and monitoring species compositions and risks are evolving, with novel research advances as well as increasingly sophisticated ecological-economic, environmental niche, and habitat suitability models. Despite advances in understanding drivers and dynamics of new species introductions, a dearth of baseline knowledge regarding Arctic marine invasions remains. Potential consequences extend beyond ecosystem changes and include legal, institutional, and social shifts. Studies on the red king and snow crab invasions in the Barents Sea from multiple disciplinary angles showcase complex social, economic, and ecological interconnections that are transforming communities and ecosystems.
The high Arctic is considered a pristine environment compared with many other regions in the northern hemisphere. It is becoming increasingly vulnerable to invasion by invasive alien species (IAS), however, as climate change leads to rapid loss of sea ice, changes in ocean temperature and salinity, and enhanced human activities. These changes are likely to increase the incidence of arrival and the potential for establishment of IAS in the region. To predict the impact of IAS, a group of experts in taxonomy, invasion biology and Arctic ecology carried out a horizon scanning exercise using the Svalbard archipelago as a case study, to identify the species that present the highest risk to biodiversity, human health and the economy within the next 10 years. A total of 114 species, currently absent from Svalbard, recorded once and/or identified only from environmental DNA samples, were initially identified as relevant for review. Seven species were found to present a high invasion risk and to potentially cause a significant negative impact on biodiversity and five species had the potential to have an economic impact on Svalbard. Decapod crabs, ascidians and barnacles dominated the list of highest risk marine IAS. Potential pathways of invasion were also researched, the most common were found associated with vessel traffic. We recommend (i) use of this approach as a key tool within the application of biosecurity measures in the wider high Arctic, (ii) the addition of this tool to early warning systems for strengthening existing surveillance measures; and (iii) that this approach is used to identify high‐risk terrestrial and freshwater IAS to understand the overall threat facing the high Arctic. Without the application of biosecurity measures, including horizon scanning, there is a greater risk that marine IAS invasions will increase, leading to unforeseen changes in the environment and economy of the high Arctic.
The paper presents micropaleontological information and observations of the North Pacific diatom species Neodenticula (N.) seminae (Simonsen and Kanaya) Akiba and Yanagisawa in the surface and Holocene sediments from the North Atlantic, Nordic, and Arctic Seas. The compilation of previously published data and new findings of this study on N. seminae in the surface sediments shows its broad occurrence as a usual element of the modern diatom microflora in the Nordic, Labrador, and Irminger Seas. The recent migration of N. seminae from its native area, the Subarctic Pacific, reflects the oceanographic shift in the late 1990s as greater transport of the warmer surface Pacific water to the Arctic causes Arctic sea-ice reduction. Micropaleontological studies of the Holocene sediments document the multiple events of N. seminae appearance in the Arctic during the latest Pleistocene and Holocene warming intervals. These observations can suggest the events of the increased influence of the North Pacific water on the Arctic environments in the past, not just during the recent warm climate amplification.
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