Some of our most beautiful rivers are ‘chalk streams’. Their pure, clear, constant water from underground chalk aquifers and springs, flowing across flinty gravel beds, make them perfect sources of ...

Some of our most beautiful rivers are chalk streams. Their clear water comes from underground chalk aquifers and springs, flowing across flinty gravel beds – they’re ideal habitats for lots of wild ...

Stream and river organisms reflect their localized niche, and surrounding landscape both upstream and downstream. River organisms have evolved in diverse and fascinating ways in the varied ...