Feret diameter (mm), area (mm2), and circularity of microplastic debris collected by manta net aboard the Scripps Environmental Accumulation of Plastic Expedition (SEAPLEX) cruise, August 2009, and NOAA Okeanos Explorer expedition, 2010.

Microplastic was collected using a standard manta net tow. Each sample was sorted at 6-12x magnification under a Wild M-5 dissecting microscope, and plastic particles and H. sericeus removed for further analysis. Plastic particles were soaked in deionized water to remove salts, dried at 60°C, and stored in a desiccator. Particles were then digitally imaged with a Zooscan digital scanner (Gilfillan et al. 2009, Gorsky et al. 2010)