A5075828721- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Marine and coastal ecosystems
- Aquatic Ecosystems and Phytoplankton Dynamics
- Microbial Community Ecology and Physiology
- Coastal wetland ecosystem dynamics
- Climate change and permafrost
- Tree-ring climate responses
- Arctic and Antarctic ice dynamics
- Polar Research and Ecology
- Toxic Organic Pollutants Impact
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Atmospheric and Environmental Gas Dynamics
Université du Québec à Chicoutimi
2021-2023
Center for Northern Studies
2021-2023
Université Laval
2021-2023
University of Helsinki
2019-2022
University of Jyväskylä
2016-2021
Lakes are a dominant feature of the Arctic landscape and focal point regional global biogeochemical cycling. We collected sediment core from High Lake in southwestern Svalbard for multiproxy paleolimnological analysis. The aim was to find linkages between terrestrial aquatic environments context climate change understand centennial-long cycling environmental dynamics. Two significant thresholds elemental were found based on physical proxies that associated with end cold Little Ice Age recent...
Abstract Climate warming and consequent greening of subarctic landscapes increase the availability organic carbon to detrital food webs in aquatic ecosystems. This may cause important shifts ecosystem functioning through functional feeding patterns benthic organisms that rely differently on climatically altered resources. Twenty‐five lakes Finnish Lapland across a tree line ecotone were analysed for limnological optical variables, (δ 13 C) nitrogen 15 N) stable isotope ( SI ) composition...
Abstract Climate change is causing seasonally ice‐covered lakes of the boreal region to undergo changes in their winter regime by altering patterns precipitation and temperature, often reflected as reduced snow ice cover duration. The duration, extent quality ice, have a pivotal role for production carbon cycling winter, with potentially cascading effects following open water period. We investigated under‐ice assessing bacterial growth (including production, respiration, efficiency) primary...
ABSTRACT The major climate events of the Common Era ( CE ) have global imprints but significant variations in their timing and magnitude been suggested. For reliable assessments past patterns applications for evaluations ongoing changes, spatially comprehensive network high‐fidelity paleorecords are necessary. In this study, we reconstruct summer air temperatures 2000 years from northern Lapland (Utsjoki, Finland). We use fossil Chironomidae (Diptera) assemblages sediments a remote subarctic...
A long hidden chydorid (Chydoridae, Cladocera) taxon, first found as fossil specimens and recently redefined Rhynchotalona latens (Sarmaja-Korjonen et al., Hydrobiologia 436: 165–169, 2000) is investigated for its biogeography ecology. Late Holocene sediment sequence from Lake Sylvilampi, NE Finnish Lapland, R. spatial distribution in relation to limno-climatic attributes Finland were examined. Principal component analyses of cladoceran communities showed that mostly affiliated with Alonella...
Abstract High latitude freshwater systems are facing changes in catchment-mediated allochthonous input, as well physical and chemical controls triggered by on-going climate change, which may alter their carbon processing ecological characteristics. To explore chironomid functional responses utilization relation to long-term environmental we studied a sediment core covering ca. 2000 years from tundra lake northern Finland, was analysed for geochemistry, isotopic composition of remains...
Independent Arctic records of temperature and precipitation from the same proxy archives are rare.Nevertheless, they important for providing detailed information on long-term climate changes temperature-precipitation relationships in context large-scale atmospheric dynamics.Here, we used chironomid cladoceran fossil assemblages to reconstruct summer airtemperature water-level changes, during past 400 years, a small lake located Finnish Lapland.Temperatures remained persistently cold over...
Abstract Global environmental change alters the production, terrestrial export, and photodegradation of organic carbon in northern lakes. Sedimentary biogeochemical records can provide a unique means to understand nature these changes over long time scales, where observational data fall short. We deployed situ experiments on two shallow subarctic lakes with contrasting light regimes; clear tundra lake dark woodland lake, first investigate photochemical transformation nitrogen elemental (C/N...
Under fundamental ecosystem changes in high latitude lakes, a functional paleolimnological approach may increase holistic understanding of lake responses and resilience to climate warming. A ~2000-year sediment record from Lake Loažžejávri the tundra northern Finnish Lapland was examined for fossil Cladocera assemblages examine long-term environmental controls on aquatic communities. In addition, cladoceran attributes, including diversity (FD), UV absorbance (ABSUV) Alona carapaces, sexual...
Abstract Algal communities act as sensitive indicators of past and present climate effects on northern lakes, but their responses can vary considerably between ecosystems. Functional trait-based approaches may help us better understand the nature diverse biotic underlying ecosystem changes. We explored patterns in diatom (Bacillariophyceae) growth forms species composition during Neoglacial two shallow lakes typical subarctic regions, including a dark-colored woodland lake clear tundra lake....