Effects of nitrogen on benthic diatom assemblages in high-elevation Central and Eastern Alpine lakes.
We explored patterns of benthic-diatom composition across 62 high-elevation Alpine lakes spanning a wide range of nitrogen (N) concentrations due to atmospheric deposition and background variation in lake and watershed characteristics (e.g., land cover, bedrock geology, lake depth, and elevation). O...
Published in: | Arctic, Antarctic, and Alpine Research |
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Online Access: | https://hdl.handle.net/10449/82555 https://doi.org/10.1080/15230430.2023.2270821 |
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ftiasma:oai:openpub.fmach.it:10449/82555 2024-04-21T07:53:01+00:00 Effects of nitrogen on benthic diatom assemblages in high-elevation Central and Eastern Alpine lakes. Lepori, F. Tolotti, M. Lepori, F. Tolotti, M. 2023 https://hdl.handle.net/10449/82555 https://doi.org/10.1080/15230430.2023.2270821 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:001110409100001 volume:55 issue:1 journal:ARCTIC ANTARCTIC AND ALPINE RESEARCH https://hdl.handle.net/10449/82555 doi:10.1080/15230430.2023.2270821 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85178211199 info:eu-repo/semantics/openAccess Atmospheric deposition Critical load Mountain lake Nutrient enrichment Diatoms Settore BIO/07 - ECOLOGIA info:eu-repo/semantics/article 2023 ftiasma https://doi.org/10.1080/15230430.2023.2270821 2024-03-27T17:48:56Z We explored patterns of benthic-diatom composition across 62 high-elevation Alpine lakes spanning a wide range of nitrogen (N) concentrations due to atmospheric deposition and background variation in lake and watershed characteristics (e.g., land cover, bedrock geology, lake depth, and elevation). Our goals were to (i) assess the effect of lake-water N concentration on benthic-diatom composition during late summer or fall conditions and (ii) identify policy- relevant response thresholds. The analyses were carried out on an existing data set of diatom and water-chemistry data (EMERGE set), integrated with new data. Multivariate and correlation analyses revealed associations between pH, N concentration, and benthic-diatom composition, but the effects of pH and N were confounded. However, partial correlation analysis allowed us to identify ‘N-responsive diatoms’, i.e., diatom taxa with non-spurious association with N. Focusing on these taxa, we detected a decline in the abundance of taxa preferring low N concentrations and an increase in the abundance of taxa preferring high N concentrations starting at NO 3 concentrations of approximately 5 μmol L -1 . We interpreted this shift as an effect of watershed N saturation due to atmospheric N deposition. Based on the results, we suggest a concentration threshold of 5 μmol NO 3 L -1 during late-summer or fall to prevent change in benthic diatoms in high-elevation Alpine lakes affected by N deposition. Article in Journal/Newspaper Antarctic and Alpine Research Fondazione Edmund Mach: IRIS-OpenPub Arctic, Antarctic, and Alpine Research 55 1 |
institution |
Open Polar |
collection |
Fondazione Edmund Mach: IRIS-OpenPub |
op_collection_id |
ftiasma |
language |
English |
topic |
Atmospheric deposition Critical load Mountain lake Nutrient enrichment Diatoms Settore BIO/07 - ECOLOGIA |
spellingShingle |
Atmospheric deposition Critical load Mountain lake Nutrient enrichment Diatoms Settore BIO/07 - ECOLOGIA Lepori, F. Tolotti, M. Effects of nitrogen on benthic diatom assemblages in high-elevation Central and Eastern Alpine lakes. |
topic_facet |
Atmospheric deposition Critical load Mountain lake Nutrient enrichment Diatoms Settore BIO/07 - ECOLOGIA |
description |
We explored patterns of benthic-diatom composition across 62 high-elevation Alpine lakes spanning a wide range of nitrogen (N) concentrations due to atmospheric deposition and background variation in lake and watershed characteristics (e.g., land cover, bedrock geology, lake depth, and elevation). Our goals were to (i) assess the effect of lake-water N concentration on benthic-diatom composition during late summer or fall conditions and (ii) identify policy- relevant response thresholds. The analyses were carried out on an existing data set of diatom and water-chemistry data (EMERGE set), integrated with new data. Multivariate and correlation analyses revealed associations between pH, N concentration, and benthic-diatom composition, but the effects of pH and N were confounded. However, partial correlation analysis allowed us to identify ‘N-responsive diatoms’, i.e., diatom taxa with non-spurious association with N. Focusing on these taxa, we detected a decline in the abundance of taxa preferring low N concentrations and an increase in the abundance of taxa preferring high N concentrations starting at NO 3 concentrations of approximately 5 μmol L -1 . We interpreted this shift as an effect of watershed N saturation due to atmospheric N deposition. Based on the results, we suggest a concentration threshold of 5 μmol NO 3 L -1 during late-summer or fall to prevent change in benthic diatoms in high-elevation Alpine lakes affected by N deposition. |
author2 |
Lepori, F. Tolotti, M. |
format |
Article in Journal/Newspaper |
author |
Lepori, F. Tolotti, M. |
author_facet |
Lepori, F. Tolotti, M. |
author_sort |
Lepori, F. |
title |
Effects of nitrogen on benthic diatom assemblages in high-elevation Central and Eastern Alpine lakes. |
title_short |
Effects of nitrogen on benthic diatom assemblages in high-elevation Central and Eastern Alpine lakes. |
title_full |
Effects of nitrogen on benthic diatom assemblages in high-elevation Central and Eastern Alpine lakes. |
title_fullStr |
Effects of nitrogen on benthic diatom assemblages in high-elevation Central and Eastern Alpine lakes. |
title_full_unstemmed |
Effects of nitrogen on benthic diatom assemblages in high-elevation Central and Eastern Alpine lakes. |
title_sort |
effects of nitrogen on benthic diatom assemblages in high-elevation central and eastern alpine lakes. |
publishDate |
2023 |
url |
https://hdl.handle.net/10449/82555 https://doi.org/10.1080/15230430.2023.2270821 |
genre |
Antarctic and Alpine Research |
genre_facet |
Antarctic and Alpine Research |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:001110409100001 volume:55 issue:1 journal:ARCTIC ANTARCTIC AND ALPINE RESEARCH https://hdl.handle.net/10449/82555 doi:10.1080/15230430.2023.2270821 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85178211199 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1080/15230430.2023.2270821 |
container_title |
Arctic, Antarctic, and Alpine Research |
container_volume |
55 |
container_issue |
1 |
_version_ |
1796936286899011584 |