The damming of rivers globally results in silt not flowing in to the oceans to protect against coastal erosion. These areas / substrate are primary nursing grounds for many marine species, which also depend on detritus coming from fully functioning riverine systems to nourish their young.
This is the start of the imbalance in the marine ecosystem, the second imbalance is the out of control human population, which obviously requires more and more food each day - making over fishing impossible to control.
The third imbalance is the warming of the seas through various well documented issues.
The final imbalance is created by the so called Marine Conservation Society who have no understanding of marine ecosystems, what's in them or taken out; yet they line their own pockets by arranging litter picking, promoting no take zones and putting cameras on boats. In other words - by promoting things people can see and do to make the oceans and seas look nice they take money and emphasis away from organisations who know what they are talking about (ie International Rivers, Dams and Alternatives). Thing is most marine life is below the water line but don't tell the so called MCS that - sooner these disgraces are bankrupt the better, unless you too disagree with Sir David Attenborough about conservation!
reply by Mr P Beenham
Reply by the so called MCS