English
norskBlar i forfatter "Kortsch, Susanne"
Viser treff 1-11 av 11
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Arctic coastal benthos long-term responses to perturbations under climate warming: Climate change impact on Arctic benthos
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-31)<p>Climate warming influences structure and function of Arctic benthic ecosystems. Assessing the response of these systems to perturbations requires long-term studies addressing key ecological processes related to recolonization and succession of species. Based on unique time-series (1980–2017), this study addresses successional patterns of hard-bottom benthos in two fjords in NW Svalbard after a ... -
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 ... -
Disentangling temporal food web dynamics facilitates understanding of ecosystem functioning
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-19)<ol> <li>Studying how food web structure and function vary through time represents an opportunity to better comprehend and anticipate ecosystem changes. Yet, temporal studies of highly resolved food web structure are scarce. With few exceptions, most temporal food web studies are either too simplified, preventing a detailed assessment of structural properties or binary, missing the temporal ... -
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 ... -
Long-term patterns (1980-2008) in the structure of a rocky-bottom macrobenthic community in Smeerenburgfjord, northwest Svalbard : assessment of density and cover using image analysis
(Master thesis; Mastergradsoppgave, 2010-12-01)Long-term patterns (1980-2008) in the structure of a macrobenthic sublittoral community on the rocky-bottom of a high Arctic fjord (Smeerenburgfjord) in northwest Svalbard were investigated using image analysis of underwater photographs from a permanently marked locality. Species composition revealed the locality to be characterized by calcareous algae, various brown- and red-algae, and several ... -
Marine food-web structure and community patterns in high-latitude marine ecosystems
(Doctoral thesis; Doktorgradsavhandling, 2016-06-24)This PhD deals with spatial and temporal community patterns in Barents Sea marine food webs and benthic communities in Svalbard. A main aim of this PhD project has been to study how community and food-web structure changes along environmental and climatic gradients, and to elucidate how species respond to climate warming in the Arctic. We used network analysis to study how the network of who eats ... -
Mechanistic model identifies increasing light availability due to sea ice reductions as cause for increasing macroalgae cover in the Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-04)In the Arctic, rising seawater temperatures and increasing underwater light caused by reductions in sea ice cover are expected to change the structure of arctic marine communities. Substantial, sometimes sudden, increases in macroalgal productivity and biomass have already been observed in arctic rocky bottom communities. These macroalgal responses have been attributed to increasing temperature and ... -
Novel feeding interactions amplify the impact of species redistribution on an Arctic food web
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-01)Species are redistributing globally in response to climate warming, impacting ecosystem functions and services. In the Barents Sea, poleward expansion of boreal species and a decreased abundance of Arctic species are causing a rapid borealization of the Arctic communities. This borealization might have profound consequences on the Arctic food web by creating novel feeding interactions between ... -
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 ... -
Spatio-temporal dynamics of multi-trophic communities reveal ecosystem-wide functional reorganization
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-13)Large‐scale alterations in marine ecosystems as a response to environmental and anthropogenic pressures have been documented worldwide. Yet, these are primarily investigated by assessing abundance fluctuations of a few dominant species, which inadequately reflect ecosystem‐wide changes. In addition, it is increasingly recognized that it is not species identity per se, but their traits that determine ...
