Competition between native Antarctic vascular plants and invasive Poa annua changes with temperature and soil nitrogen availability
Over the last decades human have introduced non-native organisms to Antarctica, including the grass species Poa annua. This non-native grass under constant growth temperatures has been shown negatively affect the growth of the only two native Antarctic vascular plants, Deschampsia antarctica and Col...
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ftunivctemuco:oai:repositoriodigital.uct.cl:10925/2020 2023-05-15T13:58:13+02:00 Competition between native Antarctic vascular plants and invasive Poa annua changes with temperature and soil nitrogen availability Cavieres, Lohengrin A. Sanhueza, Ana Karen Torres Mellado, Gustavo Casanova-Katny, Angélica Antártica 2019-10-10T21:06:48Z PDF application/pdf http://repositoriodigital.uct.cl/handle/10925/2020 https://doi.org/10.1007/s10530-017-1650-7 en eng Biological Invasions, Vol.20, N°6, 1597-1610, 2018 http://repositoriodigital.uct.cl/handle/10925/2020 doi:10.1007/s10530-017-1650-7 Invasiones biológicas Plantas invasoras Calentamiento Poa annua Colobanthus quitensis Deschampsia antarctica Artículo de Revista 2019 ftunivctemuco https://doi.org/10.1007/s10530-017-1650-7 2021-02-22T08:10:08Z Over the last decades human have introduced non-native organisms to Antarctica, including the grass species Poa annua. This non-native grass under constant growth temperatures has been shown negatively affect the growth of the only two native Antarctic vascular plants, Deschampsia antarctica and Colobanthus quitensis, under constant growth temperatures. However, whether there are changes in the interaction between these species under warmer conditions is an important question. In cold ecosystems, soil nutrient status directly affects plant responses to increases in temperature and Antarctic soils are highly variable in nutrient supply. Thus, in this study we experimentally assessed the interaction between the non-native Poa with the two native Antarctic vascular plant species at two different temperatures and levels of nutrient availability. Individual mats of the study species were collected in King George Island, and then transported to Concepcion where we conducted competition experiments. In the first experiment we used soil similar to that of Antarctica and plants in competition were grown at two temperatures: 5 degrees/2 degrees and 11 degrees/5 degrees C (day/ night temperature). In a second experiment plants were grown in these two temperature regimes, but we varied nitrogen (N) availability by irrigating plants with Hoagland solutions that contained 8000 or 300 mu M of N. Overall, Poa exerted a competitive effect on Deschampsia but only at the higher temperature and higher N availability. At 5 degrees/11 degrees C the competitive response of Deschampsia to Poa was of similar magnitude to the competitive effect of P. Deschatnpsia, and the competitive effect was greater with at low N. The competitive effect of Poa was similar to the competitive response of Colobanthus to Poa at both temperatures and N levels. Thus, at low temperatures and N soil content the native Antarctic species might withstand Poa invasion, but this might change with climate warming. Article in Journal/Newspaper Antarc* Antarctic Antarctica Antártica King George Island Repositorio Académico de la Universidad Católica de Temuco (UCT) Antarctic King George Island Biological Invasions 20 6 1597 1610 |
institution |
Open Polar |
collection |
Repositorio Académico de la Universidad Católica de Temuco (UCT) |
op_collection_id |
ftunivctemuco |
language |
English |
topic |
Plantas invasoras Calentamiento Poa annua Colobanthus quitensis Deschampsia antarctica |
spellingShingle |
Plantas invasoras Calentamiento Poa annua Colobanthus quitensis Deschampsia antarctica Cavieres, Lohengrin A. Sanhueza, Ana Karen Torres Mellado, Gustavo Casanova-Katny, Angélica Competition between native Antarctic vascular plants and invasive Poa annua changes with temperature and soil nitrogen availability |
topic_facet |
Plantas invasoras Calentamiento Poa annua Colobanthus quitensis Deschampsia antarctica |
description |
Over the last decades human have introduced non-native organisms to Antarctica, including the grass species Poa annua. This non-native grass under constant growth temperatures has been shown negatively affect the growth of the only two native Antarctic vascular plants, Deschampsia antarctica and Colobanthus quitensis, under constant growth temperatures. However, whether there are changes in the interaction between these species under warmer conditions is an important question. In cold ecosystems, soil nutrient status directly affects plant responses to increases in temperature and Antarctic soils are highly variable in nutrient supply. Thus, in this study we experimentally assessed the interaction between the non-native Poa with the two native Antarctic vascular plant species at two different temperatures and levels of nutrient availability. Individual mats of the study species were collected in King George Island, and then transported to Concepcion where we conducted competition experiments. In the first experiment we used soil similar to that of Antarctica and plants in competition were grown at two temperatures: 5 degrees/2 degrees and 11 degrees/5 degrees C (day/ night temperature). In a second experiment plants were grown in these two temperature regimes, but we varied nitrogen (N) availability by irrigating plants with Hoagland solutions that contained 8000 or 300 mu M of N. Overall, Poa exerted a competitive effect on Deschampsia but only at the higher temperature and higher N availability. At 5 degrees/11 degrees C the competitive response of Deschampsia to Poa was of similar magnitude to the competitive effect of P. Deschatnpsia, and the competitive effect was greater with at low N. The competitive effect of Poa was similar to the competitive response of Colobanthus to Poa at both temperatures and N levels. Thus, at low temperatures and N soil content the native Antarctic species might withstand Poa invasion, but this might change with climate warming. |
format |
Article in Journal/Newspaper |
author |
Cavieres, Lohengrin A. Sanhueza, Ana Karen Torres Mellado, Gustavo Casanova-Katny, Angélica |
author_facet |
Cavieres, Lohengrin A. Sanhueza, Ana Karen Torres Mellado, Gustavo Casanova-Katny, Angélica |
author_sort |
Cavieres, Lohengrin A. |
title |
Competition between native Antarctic vascular plants and invasive Poa annua changes with temperature and soil nitrogen availability |
title_short |
Competition between native Antarctic vascular plants and invasive Poa annua changes with temperature and soil nitrogen availability |
title_full |
Competition between native Antarctic vascular plants and invasive Poa annua changes with temperature and soil nitrogen availability |
title_fullStr |
Competition between native Antarctic vascular plants and invasive Poa annua changes with temperature and soil nitrogen availability |
title_full_unstemmed |
Competition between native Antarctic vascular plants and invasive Poa annua changes with temperature and soil nitrogen availability |
title_sort |
competition between native antarctic vascular plants and invasive poa annua changes with temperature and soil nitrogen availability |
publishDate |
2019 |
url |
http://repositoriodigital.uct.cl/handle/10925/2020 https://doi.org/10.1007/s10530-017-1650-7 |
op_coverage |
Antártica |
geographic |
Antarctic King George Island |
geographic_facet |
Antarctic King George Island |
genre |
Antarc* Antarctic Antarctica Antártica King George Island |
genre_facet |
Antarc* Antarctic Antarctica Antártica King George Island |
op_source |
Invasiones biológicas |
op_relation |
Biological Invasions, Vol.20, N°6, 1597-1610, 2018 http://repositoriodigital.uct.cl/handle/10925/2020 doi:10.1007/s10530-017-1650-7 |
op_doi |
https://doi.org/10.1007/s10530-017-1650-7 |
container_title |
Biological Invasions |
container_volume |
20 |
container_issue |
6 |
container_start_page |
1597 |
op_container_end_page |
1610 |
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1766266383233974272 |