Functional paleoecology and allochthonous inputs in high latitude lake food webs
Arctic freshwaters are subject to large scale changes triggered by ongoing
climate change, including lengthening of the growing season, alterations of
thermal regimes and biochemical rearrangements. Better understanding of
biological responses to ongoing changes may rise from the past. This
paleolimnological work examines functional assemblage structures and their
diversity in high latitude lakes from subarctic Finland (spatial dataset of 25
lakes and a core from Lake Loažžejávri) and Arctic Canada (a core from Greiner
Lake) in reference to long-term environmental change. Furthermore, responses
of benthic functional assemblages to allochthonous inputs (carbon, nutrients),
which are predicted to increase along the proceeding climate change, were
investigated. In subarctic Finland, chironomid (Diptera: Chironomidae)
functional feeding groups (FFG) were found to have different preference for
nutrient and carbon based variables, suggesting that they are potential habitat
indicators. Resource utilization of chironomids, as revealed by spatial and
temporal stable isotope (C and N) modelling, was controlled primarily by
availability of resources and secondarily by selective assimilation of different
carbon pools, however no strong connection to FFG structure was detected.
Regardless, allochthonous carbon input affected resource utilization by
increasing allochthony and FFG distribution by habitat changes. External
nutrient loads increased productivity in the study lakes, and from the ontogeny
of Greiner Lake marine nutrients were found particularly important. This
suggests that rising sea level, exposing low-lying coastal lakes to marine
influence, may contribute to greening of Arctic from the aquatic perspective.
These findings build towards better understanding of past food web
functioning and associated responses to environmental change and altered
energy flows under influence of multiple stressors.
Keywords: Arctic; Chironomidae; environmental change; nutrients; organic
carbon; resource utilization; stable isotopes
...
Publisher
Jyväskylän yliopistoISBN
978-951-39-7752-8ISSN Search the Publication Forum
2489-9003Contains publications
- Artikkeli I: Kivilä, H., Luoto, T. P., Rantala, M. V., Kiljunen, M., Rautio, M., & Nevalainen, L. (2019). Environmental controls on benthic food web functions and carbon resource use in subarctic lakes. Freshwater Biology, 64 (4), 643-658. DOI: 10.1111/fwb.13250
- Artikkeli II: Kivilä, E. Henriikka; Luoto, Tomi P.; Rantala, Marttiina, V; Nevalainen, Liisa (2020). Late-Holocene variability in chironomid functional assemblages and carbon utilization in a tundra lake food web. Hydrobiologia, 847 (3), 895-911. DOI: 10.1007/s10750-019-04151-7
- Artikkeli III: Kivilä E.H., Rantala M.V., Antoniades D., Luoto T.P., Nevalainen L. & Rautio M. (2019). Sea level rise may contribute to Arctic greening of coastal waterbodies, implications from the ontogeny of Greiner Lake, Nunavut, Canada. Submitted manuscript.
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- JYU Dissertations [748]
- Väitöskirjat [3411]
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