posted by Henry2 .
Thank you very much!
I still haven't found anything on biodiversity in water. I need to find a website which explains the possible scientific objectives of this type of topic. Remember that the research will be carried out by 17-year-old Italian students specializing in science and then will be translated into English. So the language used must be very simple.
All I can do is try to find articles for you -- articles that may give you enough information to write up objectives of your own.
Aquatic biodiversity (in general):
... in Europe:
Read widely ... very widely!