The recent warm dry weather in Canterbury is prompting warnings about rivers developing potentially toxic algal growths.

If you are out on the river in coming days, watch out for the region's endangered and rare riverbed nesting birds, says Environment Canterbury. The survival of these birds depends on successful breeding on the open gravel beds of our braided rivers.

Wellington, Sept 18 NZPA - Canterbury river visitors are being asked to watch their steps so they don't disturb rare riverbed nesting birds.

Environment Canterbury has joined forces with key partner organisations to stage the biodiversity event of the year - the Canterbury Restoration Field-days. They will be held next Saturday and Sunday, September 19 and 20, on Motukarara Domain, 20 km south of Christchurch.