Larval outbreaks in West Greenland:instant and subsequent effects on tundra ecosystem productivity and CO₂ exchange

Insect outbreaks can have important consequences for tundra ecosystems. In this study, we synthesise available information on outbreaks of larvae of the noctuid moth Eurois occulta in Greenland. Based on an extensive dataset from a monitoring programme in Kobbefjord, West Greenland, we demonstrate effects of a larval outbreak in 2011 on vegetation productivity and CO(2) exchange. We estimate a decreased carbon (C) sink strength in the order of 118–143 g C m(−2), corresponding to 1210–1470 tonnes C at the Kobbefjord catchment scale. The decreased C sink was, however, counteracted the following years by increased primary production, probably facilitated by the larval outbreak increasing nutrient turnover rates. Furthermore, we demonstrate for the first time in tundra ecosystems, the potential for using remote sensing to detect and map insect outbreak events. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s13280-016-0863-9) contains supplementary material, which is available to authorized users

Warming, shading and a moth outbreak reduce tundra carbon sink strength dramatically by changing plant cover and soil microbial activity

Abstract Future increases in temperature and cloud cover will alter plant growth and decomposition of the large carbon pools stored in Arctic soils. A better understanding of interactions between above- and belowground processes and communities of plants and microorganisms is essential for predicting Arctic ecosystem responses to climate change. We measured ecosystem CO2 fluxes during the growing season for seven years in a dwarf-shrub tundra in West Greenland manipulated with warming and shading and experiencing a natural larvae outbreak. Vegetation composition, soil fungal community composition, microbial activity, and nutrient availability were analyzed after six years of treatment. Warming and shading altered the plant community, reduced plant CO2 uptake, and changed fungal community composition. Ecosystem carbon accumulation decreased during the growing season by 61% in shaded plots and 51% in warmed plots. Also, plant recovery was reduced in both manipulations following the larvae outbreak during the fifth treatment year. The reduced plant recovery in manipulated plots following the larvae outbreak suggests that climate change may increase tundra ecosystem sensitivity to disturbances. Also, plant community changes mediated via reduced light and reduced water availability due to increased temperature can strongly lower the carbon sink strength of tundra ecosystems

Observations of bowhead whales in west Greenland during summer

Bowhead whales (Baleana mysticetus) are usually away from west Greenland waters during summer. Reported here is an observation of at least six bowhead whales in July 2022 in the Uummannaq Fjord system of west Greenland

Future Opportunities for Bioeconomy : Focus on the West Nordic Region

This final report provides an overview of bioresources in the West Nordic region focusing on Iceland, the Faroe Islands and Greenland, their utilisation and future opportunities based on green growth. The report provides good basis for strategic identification of beneficial projects in the region. Based on the results, a specific action plan has been formed consisting of four main actions; 1. Create a West Nordic Bioeconomy panel, 2. Establish an interdisciplinary Centre of Excellence (CoE) for the West Nordic region, 3. Arctic bioeconomy II – Project focusing on opportunities in biotechnology and 4. Program focusing on “The Blue Bioeconomy”