Susanne Kortsch

Susanne Kortsch
University of Helsinki | HY · Department of Agricultural Sciences

PhD ecology

About

27
Publications
8,407
Reads
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914
Citations
Introduction
My work focuses on how ecological networks change through time and space in response to environmental variability and perturbations from e.g. climate change
Additional affiliations
January 2012 - present
 UiT - The Arctic University of Norway, campus Narvik
Position
  • PhD Student
January 2012 - June 2016
UiT The Arctic University of Norway
Position
  • PhD Student in Marine Ecology
January 2012 - October 2017
UiT The Arctic University of Norway
Position
  • PhD. in Marine Biology & Ecology

Publications

Publications (27)
Article
Full-text available
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...
Article
Full-text available
Climate warming can trigger abrupt ecosystem changes in the Arctic. Despite the considerable interest in characterizing and understanding the ecological impact of rapid climate warming in the Arctic, few long time series exist that allow addressing these research goals. During a 30-y period (1980-2010) of gradually increasing seawater temperature a...
Article
Full-text available
Trophic interactions are central to ecosystem functioning, but the link between food web structure and ecosystem functioning remains obscure. Regularities (i.e. consistent patterns) in food web structure suggest the possibility of regularities in ecosystem functioning, which might be used to relate structure to function. We introduce a novel, genet...
Presentation
Full-text available
The objective is to analyse the structure and functional redundancy of the Weddell Sea food web considering the intensity of the trophic interactions and its topological properties. Overall, using weighted (by interaction strength) and unweighted versions of the network to better understand how the ecosystems is structured and functions. This is a...
Article
Full-text available
Ecological communities are constantly changing as a response to environmental and anthropogenic pressures. Yet, how changes in community composition influence the structure of food webs over time and space remains elusive. Using ecological network analysis, we assessed how food web structure changed across six distinct areas of the North Sea over a...
Article
Full-text available
This is an open access article under the terms of the Creat ive Commo ns Attri bution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Abstract 1. Smallholder farmers are some of the poorest and most food insecure people on Earth. Their high nutritional and economic reliance on h...
Preprint
Full-text available
Adaptative foraging behaviour should promote species coexistence and biodiversity under climate change as consumers are expected to maximise their energy intake, according to principles of optimal foraging theory. We test these assumptions using a unique dataset comprising (1) 22,185 stomach contents of fish species across functional groups and fee...
Article
Full-text available
Studying how food web structure and function varies 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 proper...
Article
Full-text available
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-botto...
Article
Full-text available
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 borealisation of the Arctic communities. This borealisation might have profound consequences on the Arctic food web b...
Article
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...
Article
Full-text available
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 spec...
Article
Full-text available
Ecological communities are constantly being reshaped in the face of environmental change and anthropogenic pressures. Yet, how food webs change over time remains poorly understood. Food web science is characterized by a trade-off between complexity (in terms of the number of species and feeding links) and dynamics. Topological analysis can use comp...
Preprint
Full-text available
Food webs have been intensively studied throughout modern ecology, using empirical evidence, statistics and modelling tools to search for consistent patterns, underlying commonalities, and variations between food webs and ecosystems. However, with few exceptions, the modelling approaches have not been based on the emergent properties of complex sim...
Article
Full-text available
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...
Article
Full-text available
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 s...
Article
Full-text available
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 af...
Article
Full-text available
Investigating the structure of ecological networks can help unravel the mechanisms promoting and maintaining biodiversity. Recently, Strona and Veech (10.1111/2041-210X.12395) introduced a new metric (, pronounced 'nos'), that allows assessment of structural patterns in networks ranging from complete node segregation to perfect nestedness, and that...
Data
Full-text available
A food web is an ecological network and its topological description consists of the list of nodes, i.e., trophospecies, the list of links, i.e., trophic interactions, and the direction of interactions (who is the prey and who is the predator). Food web topologies are widely used in ecology to describe structural properties of communities or ecosyst...
Article
Full-text available
Real networks are not isolated, but are interlinked with and dependent on other real networks. This paper presents a set of tools for studying multiple interconnected networks. Utilizing simulation, a controlled environment can be created in which to un-derstand multinetwork dynamics at small and large scales. The paper uses simulation to look at i...
Article
Full-text available
A food web is an ecological network and its topological description consists of the list of nodes, i.e., trophospecies, the list of links, i.e., trophic interactions, and the direction of interactions (who is the prey and who is the predator). Food web topologies are widely used in ecology to describe structural properties of communities or ecosyst...
Article
Full-text available
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 a...

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Projects

Project (1)
Project
This study addresses the successional pattern of a hard-bottom benthic community after a perturbation and the functional traits involved in the different stages of recolonization. Spanning nearly four decades, the time-series was initiated in 1980 by clearing the substrate free of organisms on a vertical rock wall at 15m depth and the site was subsequently photographed annually by scuba divers. The structure of the ecosystem was investigated by estimating the abundance (solitary taxa) and percentage cover (colonial taxa and macroalgae) of the benthic organisms from the images, whereas the ecological functioning of the system was examined via functional traits analysis.