Pigments and plastic in limnetic ecosystems: A qualitative and quantitative study on microparticles of different size classes /Hannes K. Imhof a, c, 1 , Christian Laforsch a, ** , 1 , Alexandra C. Wiesheu b, 1 , Johannes Schmid b, 2 , Philipp M. Anger b , Reinhard Niessner b , Natalia P. Ivleva b, - Imhof,Hannes K.