Potamopyrgus antipodarum was exposed to a mixture of five non-buoyant plastic polymers.
Microplastic particles (MP) had an irregular shape and a broad size distribution.
P. antipodarum were exposed to a high (70%) and a low dose (30%) of MP in the food.
MP had no effect on morphology, embryogenesis, life-history and juvenile development.
Many polymers may be ‘inert’ whereas some polymers may evoke effects.