Ebro Delta Questionaire
Visit to Ebro Delta. Questionnaire
1. When did the sea level stabilized in the Mediterranean? How old is the Ebro Delta? • The Mediterranean stabalized 4000 years ago • The Mediterranean is rising at 1.5 millimetres per year • The Ebro delta dates back to the end of the last ice age it has constantly changed, with the 15th to 16th centuries being the periods of greatest growth for the Delta
2. Which man-induced phenomenon accelerated sediment built up in the Ebro Delta? • Building of Dunes (specifically in 1991) • Construction of walkways on Dunes to fight against erosion • Removal of infrastructure located on the shore that prevents the normal development of the coastal dynamic • Logging of forests in central Spain because it increased erosion?
3. Which impacts have been caused in the Ebro Delta by the construction of a large number of dams in the Ebro river? • Sediment loss and erosion (sea level is expected to rise 1.5 millimetres per year and the delta is sinking due to the weight of the sediment by between 1-8 millimetres a year) • The surface of the delta isn’t stable because it is not growing from sediment, although the shape changes
4. Sturgeons vanished fro the Ebro delta 40 years ago and giant freshwater clams are highly endangered. Why? • Sturgeons vanished because dams have disrupted the Sturgeon migration for spawning so they can’t leave the delta to reproduce • Freshwater clams are highly endangered because their larvae were parasites of Sturgeons and stick to them in order to be transported upstream where they could grow • The only clams are those from before the Sturgeon vanishment
5. Many freshwater exotic species have been introduced in the Ebro Delta in the past 50 years, but no marine exotic species have been introduced. Why? • People wanted to improve the
1. When did the sea level stabilized in the Mediterranean? How old is the Ebro Delta? • The Mediterranean stabalized 4000 years ago • The Mediterranean is rising at 1.5 millimetres per year • The Ebro delta dates back to the end of the last ice age it has constantly changed, with the 15th to 16th centuries being the periods of greatest growth for the Delta
2. Which man-induced phenomenon accelerated sediment built up in the Ebro Delta? • Building of Dunes (specifically in 1991) • Construction of walkways on Dunes to fight against erosion • Removal of infrastructure located on the shore that prevents the normal development of the coastal dynamic • Logging of forests in central Spain because it increased erosion?
3. Which impacts have been caused in the Ebro Delta by the construction of a large number of dams in the Ebro river? • Sediment loss and erosion (sea level is expected to rise 1.5 millimetres per year and the delta is sinking due to the weight of the sediment by between 1-8 millimetres a year) • The surface of the delta isn’t stable because it is not growing from sediment, although the shape changes
4. Sturgeons vanished fro the Ebro delta 40 years ago and giant freshwater clams are highly endangered. Why? • Sturgeons vanished because dams have disrupted the Sturgeon migration for spawning so they can’t leave the delta to reproduce • Freshwater clams are highly endangered because their larvae were parasites of Sturgeons and stick to them in order to be transported upstream where they could grow • The only clams are those from before the Sturgeon vanishment
5. Many freshwater exotic species have been introduced in the Ebro Delta in the past 50 years, but no marine exotic species have been introduced. Why? • People wanted to improve the