Invasive crayfish increase habitat connectivity: a case study in a large boreal lake
Several studies have shown that distinct compartments of lake ecosystems are coupled via transportation of organic matter, nutrients and energy across habitat boundaries. Here we evaluate the potential of the invasive signal crayfish (Pacifastacus leniuscul...
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doaj-7503f01f8b3447ebbc8481c3f2b97a402020-11-24T23:16:13ZengEDP SciencesKnowledge and Management of Aquatic Ecosystems1961-95022013-03-0104070810.1051/kmae/2013034kmae120082Invasive crayfish increase habitat connectivity: a case study in a large boreal lakeRuokonen T.J.0Kiljunen M.1Karjalainen J.2Hämäläinen H.3Department of Biological and Environmental Science, University of Jyväskylä, Survontie 9, P.O. Box 35, 40014, University of JyväskyläDepartment of Biological and Environmental Science, University of Jyväskylä, Survontie 9, P.O. Box 35, 40014, University of JyväskyläDepartment of Biological and Environmental Science, University of Jyväskylä, Survontie 9, P.O. Box 35, 40014, University of JyväskyläDepartment of Biological and Environmental Science, University of Jyväskylä, Survontie 9, P.O. Box 35, 40014, University of Jyväskylä Several studies have shown that distinct compartments of lake ecosystems are coupled via transportation of organic matter, nutrients and energy across habitat boundaries. Here we evaluate the potential of the invasive signal crayfish (Pacifastacus leniusculus (Dana)) to modify energy pathways in large boreal lakes. Using a stable isotope mixing model and calculation of the isotopic niches we estimated the contribution of different food sources to the diets of crayfish captured from different habitats, and from that inferred their potential to transport energy across the littoral-profundal gradient. The crayfish caught from the littoral area utilized mainly littoral food sources, whereas the importance of profundal sources increased consistently with depth. We also found crayfish in deeper habitats with littoral δ13C label, which indicates significant use of littoral sources. These results presents evidence that invasive signal crayfish create a new link in energy transfer from littoral areas to profundal areas and thereby increase connectivity between these spatially distinct habitats. Our results highlight a need for better understanding of the role of crayfish in lake energy dynamics and habitat connectivity. http://dx.doi.org/10.1051/kmae/2013034crayfishhabitat connectivityinvasive speciesstable isotopes |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ruokonen T.J. Kiljunen M. Karjalainen J. Hämäläinen H. |
spellingShingle |
Ruokonen T.J. Kiljunen M. Karjalainen J. Hämäläinen H. Invasive crayfish increase habitat connectivity: a case study in a large boreal lake Knowledge and Management of Aquatic Ecosystems crayfish habitat connectivity invasive species stable isotopes |
author_facet |
Ruokonen T.J. Kiljunen M. Karjalainen J. Hämäläinen H. |
author_sort |
Ruokonen T.J. |
title |
Invasive crayfish increase habitat connectivity: a case study
in a large boreal lake |
title_short |
Invasive crayfish increase habitat connectivity: a case study
in a large boreal lake |
title_full |
Invasive crayfish increase habitat connectivity: a case study
in a large boreal lake |
title_fullStr |
Invasive crayfish increase habitat connectivity: a case study
in a large boreal lake |
title_full_unstemmed |
Invasive crayfish increase habitat connectivity: a case study
in a large boreal lake |
title_sort |
invasive crayfish increase habitat connectivity: a case study
in a large boreal lake |
publisher |
EDP Sciences |
series |
Knowledge and Management of Aquatic Ecosystems |
issn |
1961-9502 |
publishDate |
2013-03-01 |
description |
Several studies have shown that distinct compartments of lake ecosystems are coupled
via transportation of organic matter, nutrients and energy across
habitat boundaries. Here we evaluate the potential of the invasive signal crayfish
(Pacifastacus leniusculus (Dana)) to modify energy pathways in large
boreal lakes. Using a stable isotope mixing model and calculation of the isotopic niches
we estimated the contribution of different food sources to the diets of crayfish captured
from different habitats, and from that inferred their potential to transport energy across
the littoral-profundal gradient. The crayfish caught from the littoral area utilized
mainly littoral food sources, whereas the importance of profundal sources increased
consistently with depth. We also found crayfish in deeper habitats with littoral
δ13C label, which indicates significant
use of littoral sources. These results presents evidence that invasive signal crayfish
create a new link in energy transfer from littoral areas to profundal areas and thereby
increase connectivity between these spatially distinct habitats. Our results highlight a
need for better understanding of the role of crayfish in lake energy dynamics and habitat
connectivity.
|
topic |
crayfish habitat connectivity invasive species stable isotopes |
url |
http://dx.doi.org/10.1051/kmae/2013034 |
work_keys_str_mv |
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