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Moderate warming over the past 25 years has already reorganized stream invertebrate communities
Department of River Ecology and Conservation, Senckenberg Research Institute and Natural History Museum Frankfurt, Gelnhausen, Germany.ORCID iD: 0000-0003-1848-3154
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2019 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 658, p. 1531-1538Article in journal (Refereed) Published
Abstract [en]

Climate warming often results in species range shifts, biodiversity loss and accumulated climatic debts of biota (i.e. slower changes in biota than in temperature). Here, we analyzed the changes in community composition and temperature signature of stream invertebrate communities over 25 years (1990-€“2014), based on a large set of samples (n = 3782) over large elevation, latitudinal and longitudinal gradients in central Europe. Although warming was moderate (average 0.5°C), we found a strong reorganization of stream invertebrate communities. Total abundance (+35.9%) and richness (+39.2%) significantly increased. The share of abundance (TA) and taxonomic richness (TR) of warm-dwelling taxa (TA: +73.2%; TR: +60.2%) and medium-temperature-dwelling taxa (TA: +0.4%; TR: +5.8%) increased too, while cold-dwelling taxa declined (TA: -61.5%; TR: -ˆ’47.3%). The community temperature index, representing the temperature signature of stream invertebrate communities, increased at a similar pace to physical temperature, indicating a thermophilization of the communities and, for the first time, no climatic debt. The strongest changes occurred along the altitudinal gradient, suggesting that stream invertebrates use the spatial configuration of river networks to track their temperature niche uphill. Yet, this may soon come to an end due to the summit trap effect. Our results indicate an ongoing process of replacement of cold-adapted species by thermophilic species at only 0.5 °C warming, which is particularly alarming in the light of the more drastic climate warming projected for coming decades.

Place, publisher, year, edition, pages
2019. Vol. 658, p. 1531-1538
Keywords [en]
Anthropocene, Aquatic communities, Climatic debt, Community composition, Community temperature index, Thermophilization
National Category
Ecology
Identifiers
URN: urn:nbn:se:umu:diva-165416DOI: 10.1016/j.scitotenv.2018.12.234ISI: 000456175700142PubMedID: 30678011OAI: oai:DiVA.org:umu-165416DiVA, id: diva2:1372572
Available from: 2019-11-25 Created: 2019-11-25 Last updated: 2019-12-10Bibliographically approved

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