Georg H. Niedrist

Georg H. Niedrist
University of Innsbruck | UIBK · Institute of Ecology

PhD

About

42
Publications
13,319
Reads
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298
Citations
Citations since 2016
37 Research Items
297 Citations
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2016201720182019202020212022020406080
Additional affiliations
March 2020 - April 2021
Naturmuseum Südtirol
Position
  • Research Assistant
Description
  • Project: Distribution and status of fishes in South Tyrol. Data manipulation & analysis, public relations, multiple topics (species distributions, invasive fish, conservation effects, ...)
October 2019 - July 2021
University of Innsbruck
Position
  • Lecturer
Description
  • Teaching the courses: 'Biodiversity of Central European Habitats', 'High mountain limnology', 'Methods in Ecology', and 'Assessment and Evaluation of river ecosystems'
April 2014 - November 2017
University of Innsbruck
Position
  • PhD Student

Publications

Publications (42)
Article
Full-text available
Community structures of benthic invertebrates in different alpine stream types have been well documented and modeled against environmental conditions and change. However, community structure cannot be linked directly to community functions or processes, and this problem prevents clear estimation of functional consequences of environmental changes....
Article
Full-text available
1. Glacier retreat is a key component of environmental change in alpine environments, leading to significant changes in physico-chemical characteristics and biological communities in glacier-fed rivers. While the overall effects of the environment on community structure of invertebrates are largely understood, its influence on functional strategies...
Article
Full-text available
Glacier retreat alters physical and chemical characteristics and biological communities of glacier-fed streams. Functional relationships, including effects of different food-source qualities on the density and biomass of primary consumers, are insufficiently known in alpine and subalpine headwaters. We measured: 1) the relative abundance of diatoms...
Article
Full-text available
Lakes around the world are warming, but not all water layers are warming at the same rate, and some are even cooling. Most studies have focused on summer lake water surface temperatures or analyzed short-time series. Here we analyze a 44-year time-series using dynamic linear models and temporal trend decomposition of water temperature from nine dep...
Article
Full-text available
High altitude glacier-fed streams are harsh environments inhabiting specialized invertebrate communities. Most research on biotic aspects in glacier-fed streams focused on the simple relationship between presence/absence of species and prevailing environmental conditions, while functional strategies and potentials of glacial stream specialists were...
Article
Full-text available
The introduction of fish into mountain lakes typically leads to profound ecological changes within the food web, but its consequences depend on the dietary preferences of fish and on the resistance of prey organisms against predation. Here we used stable isotopes and fatty acid analyses in combination with the traditional stomach content analysis t...
Article
Full-text available
Whether and how alpine organismic communities respond to ongoing environmental changes is difficult to assess quantitatively, given their intrinsically slow responses, remote locations and limited data. Here we provide a synthesis of the first five years of a multidisciplinary, highly standardized, long-term monitoring programme of terrestrial and...
Article
Fish are some of the most threatened vertebrates in the world due to their often-sensitive response to environmental changes. Major land-use changes in the European Alps have direct and indirect impacts on fish communities, and these impacts are expected to increase in the future. Therefore, the identification of factors that are associated with th...
Article
Full-text available
Globally, inland waters emit over 2 Pg of carbon per year as carbon dioxide, of which the majority originates from streams and rivers. Despite the global significance of fluvial carbon dioxide emissions, little is known about their diel dynamics. Here we present a large-scale assessment of day- and night-time carbon dioxide fluxes at the water-air...
Article
Full-text available
High biodiversity is a prerequisite for the integrity, stability, and functioning of global aquatic ecosystems, but it is currently subject to anthropogenic threats. Small freshwater bodies with high habitat diversity are essential to sustain regional biodiversity, but species inventory and biodiversity are largely overlooked, especially in mountai...
Article
Full-text available
The accelerating climate crisis intensifies environmental changes in high-altitude ecosystems worldwide, with rising air temperature among the main stressors. While past research in Alpine streams has primarily focused on how retreating glaciers might affect the ecology of glacier-fed streams on the long run, observations of real-time alterations o...
Article
Full-text available
Human-induced (i.e., secondary) salinization affects aquatic biodiversity and ecosystem functioning worldwide. While agriculture or resource extraction are the main drivers of secondary salinization in arid and semi-arid regions of the world, the application of deicing road salt in winter can be an important source of salts entering freshwaters in...
Article
Full-text available
Aim: Although running waters are getting recognized as important methane sources, large‐scale geographical patterns of microorganisms controlling the net methane balance of streams are still unknown. Here we aim at describing community compositions of methanogenic and methanotrophic microorganisms at large spatial scales and at linking their abunda...
Article
Full-text available
Costa Rica is one of the countries with the highest species richness worldwide and forms an important land bridge between North and South America. In the past, Costa Rica suffered from deforestation due to conversion of primary forests into plantations or pastures, which caused degradation and destruction of natural habitats. To evaluate the potent...
Article
In the year 2018 some specimen of noble crayfish Astacus astacus were discovered in coexistence with the alien spiny-cheek crayfish Faxonius limosus (previous: Orconectes limosus) in lake Weißensee (Carinthia, Austria). This is a sensation, as the whole population of the native crayfish was thought to be extinct nearly 40 years ago due to a crayfis...
Preprint
Full-text available
Background: Globally, streams emit significant amounts of methane, a highly potent greenhouse gas. However, little is known about the stream sediment microbial communities that control the net methane balance in these systems, and in particular about their distribution and composition at large spatial scales. This study investigated the diversity a...
Article
Full-text available
Background Pesticide levels are generally monitored within agricultural areas, but are commonly not assessed at public places. To assess possible contamination of non-target areas, 71 public playgrounds located next to intensively managed apple and wine orchards were selected in four valleys of South Tyrol (northern Italy). Further, the impact of e...
Article
Large-scale studies are needed to identify the drivers of total mercury (THg) and monomethyl-mercury (MeHg) concentrations in aquatic ecosystems. Studies attempting to link dissolved organic matter (DOM) to levels of THg or MeHg are few and geographically constrained. Additionally, stream and river systems have been understudied as compared to lake...
Article
Full-text available
Amongst other ecosystems threatened by climate change effects, living conditions in alpine streams in glaciated basins experience considerable changes as glaciers retreat, leading to changing structures of invertebrate populations inhabiting the riverbed. Community structures are monitored in Matsch Valley since 2014, but the species pool and popul...
Cover Page
On the cover: The river Schlatenbach is fed by the Schlatenkees, one of the largest glaciers in the Hohe Tauern national park, Tyrol, Austria. Photographer: Georg Niedrist, Institute of Ecology, University of Innsbruck
Article
Lake eutrophication often results in the dominance of cyanobacteria, which are generally regarded as an unsuitable food source for zooplankton, though this is still under debate. Here we tested whether small sestonic particles are the dominant component of the diet of zooplankton during periods of cyanobacterial dominance. For this, the contributio...
Article
Full-text available
Macroinvertebrates are widely used as indicators to detect and assess anthropogenic impacts on freshwater ecosystems. However, despite being considered useful in indicating effects of environmental change in alpine catchments, little is known about species preferences for local conditions in such environments. In exploring the occurrence of 59 taxa...
Article
Full-text available
Das Makrozoobenthos wurde in den Lebensräumen " stehendes Gewässer " und und 7 (Mühlbach). Es wurden zahlreiche Individuen verschiedener Makrozoobenthosarten eingefangen. Darunter waren Strudelwürmer, Schnecken, Wenigborster, Milben und verschiedene war, alle Individuen bis auf Artniveau zu bestimmen (Tab 6). Rhithrogena cf. puthzi, Esolus parallel...
Presentation
Climate change is a significant contributor to the worldwide threat of freshwater biodiversity. Especially in alpine catchments, terrestrial and aquatic communities will be strongly affected. Within a freshwater monitoring program in the Hohe Tauern NP (Austria) selected river reaches (non-glacial, glacial) were investigated to (i) characterize the...
Poster
Full-text available
Weltweit bedrohen die Effekte des Klimawandels die Biodiversität in aquatischen Ökosystemen. Das beschleunigte Abschmelzen der Gletscher bewirkt Veränderungen der Wassermenge und -qualität in alpinen Fließgewässern. Diese hydrologischen Veränderungen werden die Biodiversität der hochangepassten Artengemeinschaften in Gletscherbächen beeinfussen. Im...
Poster
Full-text available
Chironomids are the dominating group within benthic invertebrate communities in alpine rivers, especially at higher altitudes and latitudes (Lods-Crozet et al., 2001). Environmental factors are responsible for benthic community structure in alpine streams, however a detailed knowledge of key factors responsible for their spatial and temporal patter...
Conference Paper
Full-text available
Alpine river ecosystems represent harsh environments (e.g. low temperatures, high dynamics, steep gradients, low nutrient availability) and will be affected by climate change and increasing anthropogenic impacts. Hydrological changes (e.g. melting glaciers and shrinking snow cover) will affect the invertebrate fauna in different types of alpine riv...

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Projects

Projects (6)
Project
Special session: Hydrology, biogeochemistry and ecology of mountain freshwaters Though high mountain freshwaters are generally referred as pristine and remote hydrosystems, they have been and will be affected by multifaceted direct anthropogenic pressures combined with the effects of the ongoing climate change. Water is stored in mountain watersheds during cold seasons, ensuring the availability of high quality water during summer when supply is dropping and demand is highest in lowland areas. However, mountain regions are facing unique challenges through the interaction of both indirect and direct anthropogenic stressors resulting from climate- and land-use change, such as glacier retreat or water abstraction for hydroelectric power productions, which will affect waters quantity and quality, with drastic consequences on freshwater ecosystems. This session will examine hydrology, biogeochemistry, and ecology of mountain freshwaters in relation to ongoing and predicted environmental changes in different regions worldwide and will provide monitoring-, mitigation- and adaptation plans for water management in the future. Presentations will cover the disciplines hydrology, biogeochemistry, and ecology of mountain lakes, reservoirs, rivers or wetlands and will focus on novel applied and basic research by eminent young and senior freshwater scientists. Sophie Cauvy-Fraunié, IRSTEA, Centre de Lyon-Villeurbanne, France Georg H. Niedrist, Department of Ecology, University of Innsbruck, Austria & SIL-Austria
Project
Alpine regions are considered especially vulnerable to increasing climate change impacts and globalisation. Steep gradients in the alpine environments allow to understand long-term adaptations of animals and ecosystems to the particular climate, but also to simulate prospective consequences of ongoing alteration such as glacier retreat.
Project
The Urban algae project aims to study the ecological status of urban ponds and their ecosystem services together with the citizen´s perceptions. To this end, we will combine a sampling campaign during the summer 2018 in multiple locations across Europe with an online citizen survey questionnaire. With this set-up, we want to know what the public thinks about their ponds and if this is related to the ecological status of the relevant ponds. The second important goal of this initiative is to create an international collaborative network, encouraging young and early career scientists in Europe. This project provides an excellent chance to actively participate in an interdisciplinary project and meet other young researchers!