A zone-specific fish-based biotic index as a management tool for the Zeeschelde estuary (Belgium).
Fish-based indices monitor changes in surface waters and are a valuable aid in communication by summarising complex information about the environment (Harrison and Whitfield, 2004). A zone-specific fish-based multimetric estuarine index of biotic integrity (Z-EBI) was developed based on a 13 year time series of fish surveys from the Zeeschelde estuary (Belgium). Sites were pre-classified using indicators of anthropogenic impact. Metrics showing a monotone response with pressure classes were selected for further analysis. Thresholds for the good ecological potential (GEP) were defined from references. A modified trisection was applied for the other thresholds. The Z-EBI is defined by the average of the metric scores calculated over a one year period and translated into an ecological quality ratio (EQR). The indices integrate structural and functional qualities of the estuarine fish communities. The Z-EBI performances were successfully validated for habitat degradation in the various habitat zones.
Breine
Jan
J
Research Institute for Nature and Forest, Duboislaan 14, B-1560 Groenendaal, Belgium. jan.breine@inbo.be
Quataert
Paul
P
Stevens
Maarten
M
Ollevier
Frans
F
Volckaert
Filip A M
FA
Van den Bergh
Ericia
E
Maes
Joachim
J
D000818:Animals; D001530:Belgium; D004463:Ecology / Q000379:methods*; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods*; D005399:Fishes / Q000502:physiology*; D005843:Geography; D008386:Marine Biology / Q000379:methods*; D011157:Population Dynamics; D045483:Rivers; D054712:Salinity; D012623:Seawater; D013997:Time Factors