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Institute for Nature Conservation of Serbia Serbian Environmental Protection Agency
Slavisa PopovicJasmina Mijovic Magdic
SEBI 014 Fragmentation of river systems
1. About 170 dams and accumulation in Serbia
2. About 80 dams in SeLaR database with technical properties
3. Length of rivers is 8971,65 km
Sub-indicator: Barrier density (index)
Barrier density = Number of dams / Length of rivers
BD index = 170 / 8972
BD (i) = 0,01895
0
2
4
6
8
10
12
14
16
18
Height 1-10m
Height 11-20m
Height 21-30m
Height 31-40m
Height 41-50m
Height 51-60m
Height 61-70m
Height 71-80m
Height 81-90m
Height 91-100m
Over 101m
Sub-indicator: Number of dams by height
10/24/13
Sub-indicator: Number of dams by years
0
5
10
15
20
25
1930-1950 1951-1970 1971-1990 1991-
More than 70 rivers have 1 dam
0
2
4
6
8
10
12
2 dams 3 dams
Sub-indicator: Number of rivers with more than 1 dam (Super-fragmentized rivers)
Sub-indicator: Number of dams with fish path
How to interpret the indicator:
River fragmentation disrupts the natural biophysical and ecological processes
essential for maintaining life in freshwaters. Dams disconnect rivers from the surrounding floodplains,
block migratory fish passage, and retain sediments and nutrients that nourish downstream ecosystems.
Reservoirs turn running water habitats into lake-like systems, resulting in the disappearance of fish species adapted to riverine
habitats and the proliferation of other, often exotic species adapted to still
waters. In highly fragmented rivers the diversity of life is likely to have been
reducedand the adaptive capacity of native species impacted.
Therefore an increase in river fragmentation indicates a higherlikelihood of biodiversity loss as well as a disruption in ecosystem
service delivery.
How to interpret the indicator:
1. Pressure: BD(i), High of dams… 2. Mitigation: Fish paths…
3. Species: NoSpecies, Area…4. ?...
The Iron Gates Dams and Disruption of Spawning Migration
Iron Gates dam
Located just below the Iron Gates gorge (Đerdap) between Romania and Serbia, Iron Gates is the largest hydropower dam and reservoir system along the entire Danube. The system consists of two main dams, Iron Gates I and II, built in 1972 and 1985 respectively. The
dams are constructed at river km 942 and river km 863 upstream of the Danube delta, in effect confining migratory sturgeons to 863 km of the river and cutting off important spawning sites in the Middle
Danube. Iron Gates is jointly operated by Romania and Serbia.
