Orlando-Bonaca M

Geometric morphometrics The outlines of individual segments were registered by a series of 80 equidistant two-dimensional points located along their margins. In each segment, the single fixed point (landmark) was located at the position of the basal node. Then, the remaining 79 points were placed in equidistant positions along the segment outlines and treated as semilandmarks in subsequent analyses (Zelditch, Swiderski & Sheets, 2012).

In recent years plastic pollution in the ocean has become a significant environmental concern for governments, scientists, nongovernmental organizations, and members of the public worldwide.