English
norskBlar i forfatter "Dolgov, Andrey V."
Viser treff 1-12 av 12
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Climate change alters the structure of arctic marine food webs due to poleward shifts of boreal generalists
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-09-02)Climate-driven poleward shifts, leading to changes in species composition and relative abundances, have been recently documented in the Arctic. Among the fastest moving species are boreal generalist fish which are expected to affect arctic marine food web structure and ecosystem functioning substantially. Here, we address structural changes at the food web level induced by poleward shifts via ... -
Climate-driven changes in functional biogeography of Arctic marine fish communities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-14)Climate change triggers poleward shifts in species distribution leading to changes in biogeography. In the marine environment, fish respond quickly to warming, causing community-wide reorganizations, which result in profound changes in ecosystem functioning. Functional biogeography provides a framework to address how ecosystem functioning may be affected by climate change over large spatial ... -
Food-web structure varies along environmental gradients in a high-latitude marine ecosystem
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-17)Large-scale patterns in species diversity and community composition are associated with environmental gradients, but the implications of these patterns for food-web structure are still unclear. Here, we investigated how spatial patterns in food-web structure are associated with environmental gradients in the Barents Sea, a highly productive shelf sea of the Arctic Ocean. We compared food webs ... -
Functional diversity of the Barents Sea fish community
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014)This paper provides the first assessment of the functional diversity (FD) of the Barents Sea fish community. FD is recognized as an important driver of ecosystem functions and, thus, governs the adaptability of ecosystems in the face of disturbance. We integrate ecosystem survey data with an extensive trait matrix and show that fish FD displayed large spatial variation. The study period (2004 to ... -
Functional roles and redundancy of demersal Barents Sea fish: Ecological implications of environmental change
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-21)When facing environmental change and intensified anthropogenic impact on marine ecosystems, extensive knowledge of how these systems are functioning is required in order to manage them properly. However, in high-latitude ecosystems, where climate change is expected to have substantial ecological impact, the ecosystem functions of biological species have received little attention, partly due to the ... -
Increased functional diversity warns of ecological transition in the Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-07)As temperatures rise, motile species start to redistribute to more suitable areas, potentially affecting the persistence of several resident species and altering biodiversity and ecosystem functions. In the Barents Sea, a hotspot for global warming, marine fish from boreal regions have been increasingly found in the more exclusive Arctic region. Here, we show that this shift in species distribution ... -
Large-scale patterns in community structure of benthos and fish in the Barents Sea
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-04-23)Biogeographical patterns have an ecological basis, but few empirical studies possess the necessary scale and resolution relevant for investigation. The Barents Sea shelf provides an ideal study area, as it is a transition area between Atlantic and Arctic regions, and is sampled by a comprehensive survey of all major functional groups. We studied spatial variation in species composition of demersal ... -
Marine fishes of the arctic region
(Conference object; Konferansebidrag, 2018)First comprehensive and unified treatment of the marine fish fauna in the whole Panarctic region. Information on 229 species of marine fish. Outcome of a three year project (Dec. 2014 - Feb. 2018). Fundedby theNorwegian Ministry ofForeign Affairs. -
Resource‐driven colonization by cod in a high Arctic food web
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-11-23)<ol> <li>Climate change is commonly associated with many species redistributions and the influence of other factors may be marginalized, especially in the rapidly warming Arctic.</li> <li>The Barents Sea, a high latitude large marine ecosystem in the Northeast Atlantic has experienced above‐average temperatures since the mid‐2000s with divergent bottom temperature trends at subregional ... -
The rise of a marine generalist predator and the fall of beta diversity
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-17)Determining the importance of physical and biological drivers in shaping biodiversity in diverse ecosystems remains a global challenge. Advancements have been made towards this end in large marine ecosystems with several studies suggesting environmental forcing as the primary driver. However, both empirical and theoretical studies point to additional drivers of changes in diversity involving trophic ... -
The role of marine mammals in the Barents Sea foodweb
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-26)Marine mammals are important players in the Barents Sea ecosystem but their structural role in the foodweb has been little explored. We compare foodweb-related characteristics within and between phylogenetic groups for 19 marine mammals. As a group, they directly connect to the most central species (i.e cod and haddock) in the Barents Sea (i.e. cod and haddock) and consume over half of the available ... -
Successive extreme climatic events lead to immediate, large-scale, and diverse responses from fish in the Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-06)The warming trend of the Arctic is punctuated by several record-breaking warm years with very low sea ice concentrations. The nature and reversibility of marine ecosystem responses to these multiple extreme climatic events (ECEs) are poorly understood. Here, we investigate the ecological signatures of three successive bottom temperature maxima concomitant with surface ECEs between 2004 and 2017 in ...
