Nutrient dynamics between sediment and overlying water in the inner part of Izmir Bay, Eastern Aegean |
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Authors: | Ebru Yesim Ozkan Ahmet Kocatas Baha Buyukisik |
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Institution: | (1) Landscape Ecology, University of Vechta, Vechta, Germany;(2) Alfred-Wegener-Institute, Bremerhaven, Germany;(3) Institute for Environmental Science, University of Vechta, Postfach 1553, 49377 Vechta, Germany |
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Abstract: | In this article a concept is described in order to predict and map the occurrence of benthic communities within and near the
German Exclusive Economic Zone (EEZ) of the North Sea. The approach consists of two work steps: (1) geostatistical analysis
of abiotic measurement data and (2) calculation of benthic provinces by means of Classification and Regression Trees (CART)
and GIS-techniques. From bottom water measurements on salinity, temperature, silicate and nutrients as well as from punctual
data on grain size ranges (0–20, 20–63, 63–2,000 μ) raster maps were calculated by use of geostatistical methods. At first
the autocorrelation structure was examined and modelled with help of variogram analysis. The resulting variogram models were
then used to calculate raster maps by applying ordinary kriging procedures. After intersecting these raster maps with punctual
data on eight benthic communities a decision tree was derived to predict the occurrence of these communities within the study
area. Since such a CART tree corresponds to a hierarchically ordered set of decision rules it was applied to the geostatistically
estimated raster data to predict benthic habitats within and near the EEZ. |
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Keywords: | Benthic habitat mapping Benthos North Sea Exclusive Economic Zone (EEZ) Multivariate statistics Classification and Regression Trees (CART) Geostatistics |
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