Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Glacier dynamics influenced carbon flows through lake food webs: evidence from a chironomid ?13C-based reconstruction in the Nepalese Himalayas |
| Abstract | Using a sediment core covering the last 3,500 years, we analysed photosynthetic pigments' concentrations in lake sediments and carbon stable isotopic composition of chironomid (Diptera, Chironomidae) remains (δ13CHC). We aimed to reconstruct temporal changes in aquatic primary productivity and carbon resources sustaining chironomid larvae in a high mountain lake (Lake Pyramid Inferior; 5,067 m a.s.l.) located in the Nepalese Himalayas. Both pigments and δ13CHC trends followed a similar fluctuating pattern over time, and we found significant positive relationships between these proxies, suggesting the strong reliance of benthic consumers on the aquatic primary production. Temporal trends matched well with main known climatic phases in the Eastern part of the Himalayan Mountains. Past glacier dynamics and associated in-lake solute concentrations appeared to be the main driver of autochthonous primary productivity, suggesting then the indirect impact of climate change on carbon processing in the benthic food web. During warm periods, the glacier retreat induced a rise in in-lake solute concentrations leading to an increasing primary productivity. Complementary investigations are still needed to strengthen our understanding about the response of past aquatic carbon cycling in CO2-limiting environments. |
| Source | Hydrobiologia (Dordr., Online) 809 (1), pp. 285–295 |
| Keywords | Food websCarbon stable isotopeSubfossil chironomidSedimentary pigmentsPaleolimnology |
| Journal | Hydrobiologia (Dordr., Online) |
| Editor | Kluwer, Dordrecht, Paesi Bassi |
| Year | 2018 |
| Type | Articolo in rivista |
| DOI | 10.1007/s10750-017-3477-8 |
| Authors | Belle S.; Musazzi S.; Lami A. |
| Text | 398730 2018 10.1007/s10750 017 3477 8 Scopus 2 s2.0 85040370675 ISI Web of Science WOS 000424203000021 Food webs Carbon stable isotope Subfossil chironomid Sedimentary pigments Paleolimnology Glacier dynamics influenced carbon flows through lake food webs evidence from a chironomid 13C based reconstruction in the Nepalese Himalayas Belle S.; Musazzi S.; Lami A. Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, , Sweden; Istituto per lo Studio degli Ecosistemi, CNR, Verbania Pallanza, , Italy Using a sediment core covering the last 3,500 years, we analysed photosynthetic pigments concentrations in lake sediments and carbon stable isotopic composition of chironomid Diptera, Chironomidae remains δ13CHC . We aimed to reconstruct temporal changes in aquatic primary productivity and carbon resources sustaining chironomid larvae in a high mountain lake Lake Pyramid Inferior; 5,067 m a.s.l. located in the Nepalese Himalayas. Both pigments and δ13CHC trends followed a similar fluctuating pattern over time, and we found significant positive relationships between these proxies, suggesting the strong reliance of benthic consumers on the aquatic primary production. Temporal trends matched well with main known climatic phases in the Eastern part of the Himalayan Mountains. Past glacier dynamics and associated in lake solute concentrations appeared to be the main driver of autochthonous primary productivity, suggesting then the indirect impact of climate change on carbon processing in the benthic food web. During warm periods, the glacier retreat induced a rise in in lake solute concentrations leading to an increasing primary productivity. Complementary investigations are still needed to strengthen our understanding about the response of past aquatic carbon cycling in CO2 limiting environments. 809 Published version http //www.scopus.com/inward/record.url eid=2 s2.0 85040370675 partnerID=q2rCbXpz Articolo 2018_Hydrobiologia_809_285_295.pdf Articolo in rivista Kluwer 1573 5117 Hydrobiologia Dordr., Online Hydrobiologia Dordr., Online Hydrobiologia Dordr., Online Hydrobiologia. Dordr., Online Hydrobiologia Dordrecht Dordr., Online Hydrobiologia Boston Dordr., Online Hydrobiologia London Dordr., Online simona.musazzi MUSAZZI SIMONA andrea.lami LAMI ANDREA |