Ecological training set of freshwater ostracods in Canadian and Siberian periglacial regions
Quantified palaeoenvironmental reconstructions are essential to estimate the impact of future climate changes on ecosystems. Based on faunistic data from regional multireference sites and limnological surveys, ecological training sets can be used to build transfer functions to infer major environmen...
Main Authors: | , , , |
---|---|
Format: | Conference Object |
Language: | unknown |
Published: |
2008
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/18631/ https://epic.awi.de/id/eprint/18631/1/Wet2008d.pdf https://hdl.handle.net/10013/epic.30274 https://hdl.handle.net/10013/epic.30274.d001 |
id |
ftawi:oai:epic.awi.de:18631 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Quantified palaeoenvironmental reconstructions are essential to estimate the impact of future climate changes on ecosystems. Based on faunistic data from regional multireference sites and limnological surveys, ecological training sets can be used to build transfer functions to infer major environmental variables (e.g., temperature, conductivity, DOC, and pH value) in a greater study area. The remote Polar regions are affected by bigger amplitude of climate change than elsewhere on this planet and make ecological training sets in this region so important.Freshwater ostracods from Arctic nvironments have the potential to hindcast glacial/interglacial and stadial/interstadial alaeoclimate variations. Various methods can be applied to fossil assemblages such as indicator species approach, modern analoguetechniques and transfer functions based on ecological training sets.The present training set combines data from the Canadian (Southampton Island at 63-65°N; Bylot Island at 72-73°N) and the Siberian (Central Yakutia at 61°N; Northeast Yakutia at 66°N; Lena Delta at 72°N) high latitudes with reference areas in Central Canada (Whapmagoostui-Kuujjuarapik at 50-55°N; Churchill at 58°N). A total of 75 localities were sampled during field work in 2005-2007. In general, life conditions for aquatic organisms such as freshwater ostracods in the high latitude regions are extremeand limited by short open water periods during the summer and strong variations of water temperatures in the shallow waters. The host waters in periglacial regions are affected by permafrost and thermokarst processes and mostly represented as polygonal ponds or thermokarst lakes in different stages of their development. Generally, the waters in our study area have a mean pH-value of 7.6, ranging from pH 6.0 to pH 9.2. They are characterised by low ionic contents (Condmean = 231μS*cm−1), but the training set includes sites between 4.4 μS*cm−1 (e.g., on Bylot Island) and 1433 μS*cm−1 (e.g., in Central Yakutia). A principal component analysis reveals that 88.5 % of the variability of the environmental data is explained by the first ordination axis corresponding to pH, conductivity and major cations (i.e., Ca, Na). The studied ostracod assemblages are characterised by dominance of single species indifferent regions, e.g., Cyclocypris ovum on Bylot Island, Fabaeformiscandona pedata in the Lena Delta. In general, the species diversity in northern latitudes is relatively low due to the harsh environmental conditions affecting ostracods ontogeny. In total, 16 species were used in the presented data set.Further implementation of the ecological training set into transfer functions for one or more variables are prosperous. |
format |
Conference Object |
author |
Wetterich, Sebastian Viehberg, F. A. Pienitz, R. Schirrmeister, Lutz |
spellingShingle |
Wetterich, Sebastian Viehberg, F. A. Pienitz, R. Schirrmeister, Lutz Ecological training set of freshwater ostracods in Canadian and Siberian periglacial regions |
author_facet |
Wetterich, Sebastian Viehberg, F. A. Pienitz, R. Schirrmeister, Lutz |
author_sort |
Wetterich, Sebastian |
title |
Ecological training set of freshwater ostracods in Canadian and Siberian periglacial regions |
title_short |
Ecological training set of freshwater ostracods in Canadian and Siberian periglacial regions |
title_full |
Ecological training set of freshwater ostracods in Canadian and Siberian periglacial regions |
title_fullStr |
Ecological training set of freshwater ostracods in Canadian and Siberian periglacial regions |
title_full_unstemmed |
Ecological training set of freshwater ostracods in Canadian and Siberian periglacial regions |
title_sort |
ecological training set of freshwater ostracods in canadian and siberian periglacial regions |
publishDate |
2008 |
url |
https://epic.awi.de/id/eprint/18631/ https://epic.awi.de/id/eprint/18631/1/Wet2008d.pdf https://hdl.handle.net/10013/epic.30274 https://hdl.handle.net/10013/epic.30274.d001 |
long_lat |
ENVELOPE(-77.762,-77.762,55.276,55.276) ENVELOPE(-84.501,-84.501,64.463,64.463) ENVELOPE(-77.750,-77.750,55.250,55.250) |
geographic |
Arctic Bylot Island Canada Kuujjuarapik Southampton Island Whapmagoostui |
geographic_facet |
Arctic Bylot Island Canada Kuujjuarapik Southampton Island Whapmagoostui |
genre |
Arctic Bylot Island Climate change Kuujjuarapik lena delta permafrost Southampton Island Thermokarst Yakutia |
genre_facet |
Arctic Bylot Island Climate change Kuujjuarapik lena delta permafrost Southampton Island Thermokarst Yakutia |
op_source |
EPIC3European Geosciences Union (EGU) General Assembly, April 13-18, 2008, Vienna, Austria. SRef-ID: 1607-7962/gra/EGU2008-A-01983. |
op_relation |
https://epic.awi.de/id/eprint/18631/1/Wet2008d.pdf https://hdl.handle.net/10013/epic.30274.d001 Wetterich, S. orcid:0000-0001-9234-1192 , Viehberg, F. A. , Pienitz, R. and Schirrmeister, L. orcid:0000-0001-9455-0596 (2008) Ecological training set of freshwater ostracods in Canadian and Siberian periglacial regions , European Geosciences Union (EGU) General Assembly, April 13-18, 2008, Vienna, Austria. SRef-ID: 1607-7962/gra/EGU2008-A-01983. . hdl:10013/epic.30274 |
_version_ |
1766349519047360512 |
spelling |
ftawi:oai:epic.awi.de:18631 2023-05-15T15:19:20+02:00 Ecological training set of freshwater ostracods in Canadian and Siberian periglacial regions Wetterich, Sebastian Viehberg, F. A. Pienitz, R. Schirrmeister, Lutz 2008 application/pdf https://epic.awi.de/id/eprint/18631/ https://epic.awi.de/id/eprint/18631/1/Wet2008d.pdf https://hdl.handle.net/10013/epic.30274 https://hdl.handle.net/10013/epic.30274.d001 unknown https://epic.awi.de/id/eprint/18631/1/Wet2008d.pdf https://hdl.handle.net/10013/epic.30274.d001 Wetterich, S. orcid:0000-0001-9234-1192 , Viehberg, F. A. , Pienitz, R. and Schirrmeister, L. orcid:0000-0001-9455-0596 (2008) Ecological training set of freshwater ostracods in Canadian and Siberian periglacial regions , European Geosciences Union (EGU) General Assembly, April 13-18, 2008, Vienna, Austria. SRef-ID: 1607-7962/gra/EGU2008-A-01983. . hdl:10013/epic.30274 EPIC3European Geosciences Union (EGU) General Assembly, April 13-18, 2008, Vienna, Austria. SRef-ID: 1607-7962/gra/EGU2008-A-01983. Conference notRev 2008 ftawi 2021-12-24T15:32:39Z Quantified palaeoenvironmental reconstructions are essential to estimate the impact of future climate changes on ecosystems. Based on faunistic data from regional multireference sites and limnological surveys, ecological training sets can be used to build transfer functions to infer major environmental variables (e.g., temperature, conductivity, DOC, and pH value) in a greater study area. The remote Polar regions are affected by bigger amplitude of climate change than elsewhere on this planet and make ecological training sets in this region so important.Freshwater ostracods from Arctic nvironments have the potential to hindcast glacial/interglacial and stadial/interstadial alaeoclimate variations. Various methods can be applied to fossil assemblages such as indicator species approach, modern analoguetechniques and transfer functions based on ecological training sets.The present training set combines data from the Canadian (Southampton Island at 63-65°N; Bylot Island at 72-73°N) and the Siberian (Central Yakutia at 61°N; Northeast Yakutia at 66°N; Lena Delta at 72°N) high latitudes with reference areas in Central Canada (Whapmagoostui-Kuujjuarapik at 50-55°N; Churchill at 58°N). A total of 75 localities were sampled during field work in 2005-2007. In general, life conditions for aquatic organisms such as freshwater ostracods in the high latitude regions are extremeand limited by short open water periods during the summer and strong variations of water temperatures in the shallow waters. The host waters in periglacial regions are affected by permafrost and thermokarst processes and mostly represented as polygonal ponds or thermokarst lakes in different stages of their development. Generally, the waters in our study area have a mean pH-value of 7.6, ranging from pH 6.0 to pH 9.2. They are characterised by low ionic contents (Condmean = 231μS*cm−1), but the training set includes sites between 4.4 μS*cm−1 (e.g., on Bylot Island) and 1433 μS*cm−1 (e.g., in Central Yakutia). A principal component analysis reveals that 88.5 % of the variability of the environmental data is explained by the first ordination axis corresponding to pH, conductivity and major cations (i.e., Ca, Na). The studied ostracod assemblages are characterised by dominance of single species indifferent regions, e.g., Cyclocypris ovum on Bylot Island, Fabaeformiscandona pedata in the Lena Delta. In general, the species diversity in northern latitudes is relatively low due to the harsh environmental conditions affecting ostracods ontogeny. In total, 16 species were used in the presented data set.Further implementation of the ecological training set into transfer functions for one or more variables are prosperous. Conference Object Arctic Bylot Island Climate change Kuujjuarapik lena delta permafrost Southampton Island Thermokarst Yakutia Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Bylot Island Canada Kuujjuarapik ENVELOPE(-77.762,-77.762,55.276,55.276) Southampton Island ENVELOPE(-84.501,-84.501,64.463,64.463) Whapmagoostui ENVELOPE(-77.750,-77.750,55.250,55.250) |