 Many river pools which are an important summer refuge and habitat for aquatic and terrestrial flora and fauna have been lost due to sedimentation and modification of the flow regime caused by impoundments in the Canning River . 
 Many river pools which <a href='drop_aux' title='1'><mark>are</mark></a>an important summer refuge and habitat for aquatic and terrestrial flora and fauna <a href='been_done' title='2'><mark>have</mark></a> been lost due to sedimentation and modification of the flow regime caused by impoundments in the Canning River . 
Many river pools which an important summer refuge and habitat for aquatic and terrestrial flora and fauna done been lost due to sedimentation and modification of the flow regime caused by impoundments in da Canning River .