<div><p>(A) Map of the study area with 2,846 sampling stations (dots) categorized into 272 square kilometer blocks (squares containing 16 stations at most). A dot is filled when a station has been dredged at least once in 1998–2002 and is open when the station was never dredged during that period.</p>
<p>(B) Densities of available cockles remained stable in dredged blocks, but they increased (+3% y<sup>−1</sup>) in undredged blocks (open dots ± SE bars). Quality of available cockles declined in dredged areas (−11% y<sup>−1</sup>), whereas it remained stable in undredged areas (filled dots ± SE bars).</p></div
