Aquatic Toxicology 54 (2001) 1–14 Comparison of nitrate tolerance between different populations of the common frog, Rana temporaria
Euthrophication-associated changes in the physical and biological environment of lakes and ponds are potentially a source of major stress for many aquatic organisms. In Scandinavia, the nitrate concentrations in lakes and ponds decrease towards north due to a naturally lower productivity of the habi...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.505.64 2023-05-15T16:13:03+02:00 Aquatic Toxicology 54 (2001) 1–14 Comparison of nitrate tolerance between different populations of the common frog, Rana temporaria Markus Johansson Juha Merila ̈ The Pennsylvania State University CiteSeerX Archives 2000 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.505.64 http://www.helsinki.fi/biosci/egru/pdf/2001/AquaTox2001.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.505.64 http://www.helsinki.fi/biosci/egru/pdf/2001/AquaTox2001.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.helsinki.fi/biosci/egru/pdf/2001/AquaTox2001.pdf Amphibians Geographic variation Nitrate toxicity Rana temporaria text 2000 ftciteseerx 2016-01-08T09:21:38Z Euthrophication-associated changes in the physical and biological environment of lakes and ponds are potentially a source of major stress for many aquatic organisms. In Scandinavia, the nitrate concentrations in lakes and ponds decrease towards north due to a naturally lower productivity of the habitats, but also due to lower supplementation of anthropogenic nitrogen. A chronic experiment using ecologically relevant concentrations of sodium nitrate (0–5000 gl−1) was used to test whether common frog (Rana temporaria L.) larvae from northern parts of Scandinavia are less well adapted to cope with high nitrate concentrations than those from the southern parts. Slight, but significant differences in nitrate tolerance, as measured in terms of growth rate and size at metamorphosis, between the two regions were found. High concentrations of nitrate reduced the growth rates and metamorphic size in north, but not in south. However, there was no clear-cut impact of high nitrate concentrations on developmental rate or on mortality until metamorphosis. The general lack of large effects of nitrate treatment on the response variables suggests that nitrates per se do not pose any significant threat to the development of R. temporaria tadpoles under a natural range of concentrations. This was confirmed in an acute test where results suggest that ammonia and nitrite, compounds seldom found in high concentrations in Fennoscandian lakes, are possibly responsible for the larger Text Fennoscandian Unknown |
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ftciteseerx |
language |
English |
topic |
Amphibians Geographic variation Nitrate toxicity Rana temporaria |
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Amphibians Geographic variation Nitrate toxicity Rana temporaria Markus Johansson Juha Merila ̈ Aquatic Toxicology 54 (2001) 1–14 Comparison of nitrate tolerance between different populations of the common frog, Rana temporaria |
topic_facet |
Amphibians Geographic variation Nitrate toxicity Rana temporaria |
description |
Euthrophication-associated changes in the physical and biological environment of lakes and ponds are potentially a source of major stress for many aquatic organisms. In Scandinavia, the nitrate concentrations in lakes and ponds decrease towards north due to a naturally lower productivity of the habitats, but also due to lower supplementation of anthropogenic nitrogen. A chronic experiment using ecologically relevant concentrations of sodium nitrate (0–5000 gl−1) was used to test whether common frog (Rana temporaria L.) larvae from northern parts of Scandinavia are less well adapted to cope with high nitrate concentrations than those from the southern parts. Slight, but significant differences in nitrate tolerance, as measured in terms of growth rate and size at metamorphosis, between the two regions were found. High concentrations of nitrate reduced the growth rates and metamorphic size in north, but not in south. However, there was no clear-cut impact of high nitrate concentrations on developmental rate or on mortality until metamorphosis. The general lack of large effects of nitrate treatment on the response variables suggests that nitrates per se do not pose any significant threat to the development of R. temporaria tadpoles under a natural range of concentrations. This was confirmed in an acute test where results suggest that ammonia and nitrite, compounds seldom found in high concentrations in Fennoscandian lakes, are possibly responsible for the larger |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Markus Johansson Juha Merila ̈ |
author_facet |
Markus Johansson Juha Merila ̈ |
author_sort |
Markus Johansson |
title |
Aquatic Toxicology 54 (2001) 1–14 Comparison of nitrate tolerance between different populations of the common frog, Rana temporaria |
title_short |
Aquatic Toxicology 54 (2001) 1–14 Comparison of nitrate tolerance between different populations of the common frog, Rana temporaria |
title_full |
Aquatic Toxicology 54 (2001) 1–14 Comparison of nitrate tolerance between different populations of the common frog, Rana temporaria |
title_fullStr |
Aquatic Toxicology 54 (2001) 1–14 Comparison of nitrate tolerance between different populations of the common frog, Rana temporaria |
title_full_unstemmed |
Aquatic Toxicology 54 (2001) 1–14 Comparison of nitrate tolerance between different populations of the common frog, Rana temporaria |
title_sort |
aquatic toxicology 54 (2001) 1–14 comparison of nitrate tolerance between different populations of the common frog, rana temporaria |
publishDate |
2000 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.505.64 http://www.helsinki.fi/biosci/egru/pdf/2001/AquaTox2001.pdf |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
http://www.helsinki.fi/biosci/egru/pdf/2001/AquaTox2001.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.505.64 http://www.helsinki.fi/biosci/egru/pdf/2001/AquaTox2001.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1765998655483936768 |