Institute for Nature Conservation of Serbia Serbian Environmental Protection Agency Slavisa Popovic Jasmina Mijovic Magdic SEBI 014 Fragmentation of river.

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Presentation transcript:

Institute for Nature Conservation of Serbia Serbian Environmental Protection Agency Slavisa Popovic Jasmina 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

Sub-indicator: Number of dams by height

10/24/13 Sub-indicator: Number of dams by years

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 reduced and the adaptive capacity of native species impacted. Therefore an increase in river fragmentation indicates a higher likelihood 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.