FIGURE 2.

Flow-diagram of the screening process for the systematic literature review. ^∗Publications were excluded if they did not meet one or more of the following criteria: (Q1) data series of both Zostera and bird abundance with at least four sample points; (Q2) comparison of Zostera abundance with and without birds (i.e., caging experiments or spatial/temporal comparisons); and (Q3) records of diet composition. See Sections “Methods” and “Results” for further details and Supplementary Table S1 for a complete list of the screened publications.