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Heavy metals and stable isotopes in a benthic omnivore in a trophic gradient of lakes

Larsson, Per LU ; Holmqvist, Niklas LU ; Stenroth, Patrik LU ; Berglund, Olof LU ; Nyström, Per LU and Granéli, Wilhelm LU (2007) In Environmental Science & Technology 41(17). p.5973-5979
Abstract
Heavy metals (Cd, Hg, and Pb) and stable isotopes (N-15, C-13) in crayfish (Pacifastacus leniusculus) were studied in a trophic gradient of lakes (N = 19) in southern Sweden. Trophic indicators of the lakes as total phosphorus (tot-P) varied from 5 to 93 mu g/L. The examined lakes had no known point sources of heavy metals, but the catchment areas varied from mainly forested to agricultural land. Cd and Hg in crayfish were affected by the trophic status of the lakes, showing significant negative relationship with tot-P, total nitrogen, and chlorophyll A content and a positive relationship with lake transparency (Secchi depth). The concentration of these two heavy metals was thus higher in crayfish in the oligotrophic lakes and decreased... (More)
Heavy metals (Cd, Hg, and Pb) and stable isotopes (N-15, C-13) in crayfish (Pacifastacus leniusculus) were studied in a trophic gradient of lakes (N = 19) in southern Sweden. Trophic indicators of the lakes as total phosphorus (tot-P) varied from 5 to 93 mu g/L. The examined lakes had no known point sources of heavy metals, but the catchment areas varied from mainly forested to agricultural land. Cd and Hg in crayfish were affected by the trophic status of the lakes, showing significant negative relationship with tot-P, total nitrogen, and chlorophyll A content and a positive relationship with lake transparency (Secchi depth). The concentration of these two heavy metals was thus higher in crayfish in the oligotrophic lakes and decreased linearly to the eutrophic ones. Pb was not related to any lake variable. Stable isotopes of carbon (delta C-13) and nitrogen (615N) in crayfish were a reflection of that found in the sediment as shown by positive linear relationships for the lakes. In the sediment of the lakes, delta C-13 signature showed significant negative relationships with the trophic indicators but positive results were shown for lake transparency. The trophic gradient of the lakes was reflected by delta C-13 in the sediment and in the crayfish. 615N in crayfish was a reflection of 615N in the sediment but the relationship was not coupled to the trophic statue of the lakes. The results from the study show that Cd and Hg in benthic omnivores as crayfish are affected by ecological processes in lakes, such as eutrophication. Stable isotopes, such as 13C and 15 N, can be used to study these ecological processes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
lake, crayfish, stable isotopes, heavy metals
in
Environmental Science & Technology
volume
41
issue
17
pages
5973 - 5979
publisher
The American Chemical Society
external identifiers
  • wos:000249240100016
  • scopus:34548546622
ISSN
1520-5851
DOI
10.1021/es0704838
language
English
LU publication?
yes
id
e0ec31cf-e47d-49cb-8373-5adf1b36d9e6 (old id 688113)
date added to LUP
2007-12-14 13:14:06
date last changed
2017-01-01 07:25:01
@article{e0ec31cf-e47d-49cb-8373-5adf1b36d9e6,
  abstract     = {Heavy metals (Cd, Hg, and Pb) and stable isotopes (N-15, C-13) in crayfish (Pacifastacus leniusculus) were studied in a trophic gradient of lakes (N = 19) in southern Sweden. Trophic indicators of the lakes as total phosphorus (tot-P) varied from 5 to 93 mu g/L. The examined lakes had no known point sources of heavy metals, but the catchment areas varied from mainly forested to agricultural land. Cd and Hg in crayfish were affected by the trophic status of the lakes, showing significant negative relationship with tot-P, total nitrogen, and chlorophyll A content and a positive relationship with lake transparency (Secchi depth). The concentration of these two heavy metals was thus higher in crayfish in the oligotrophic lakes and decreased linearly to the eutrophic ones. Pb was not related to any lake variable. Stable isotopes of carbon (delta C-13) and nitrogen (615N) in crayfish were a reflection of that found in the sediment as shown by positive linear relationships for the lakes. In the sediment of the lakes, delta C-13 signature showed significant negative relationships with the trophic indicators but positive results were shown for lake transparency. The trophic gradient of the lakes was reflected by delta C-13 in the sediment and in the crayfish. 615N in crayfish was a reflection of 615N in the sediment but the relationship was not coupled to the trophic statue of the lakes. The results from the study show that Cd and Hg in benthic omnivores as crayfish are affected by ecological processes in lakes, such as eutrophication. Stable isotopes, such as 13C and 15 N, can be used to study these ecological processes.},
  author       = {Larsson, Per and Holmqvist, Niklas and Stenroth, Patrik and Berglund, Olof and Nyström, Per and Granéli, Wilhelm},
  issn         = {1520-5851},
  keyword      = {lake,crayfish,stable isotopes,heavy metals},
  language     = {eng},
  number       = {17},
  pages        = {5973--5979},
  publisher    = {The American Chemical Society},
  series       = {Environmental Science & Technology},
  title        = {Heavy metals and stable isotopes in a benthic omnivore in a trophic gradient of lakes},
  url          = {http://dx.doi.org/10.1021/es0704838},
  volume       = {41},
  year         = {2007},
}