Fig. 1: Shell thickness and aperture size trends over the last century. | Communications Earth & Environment

Fig. 1: Shell thickness and aperture size trends over the last century.

From: Shell thickness of Nucella lapillus in the North Sea increased over the last 130 years despite ocean acidification

Fig. 1

a Image showing the section of shell used for the thickness analyses. The dorsal region where thickness measurements were carried out is highlighted in red. b Relationship of aperture size with sampling year, shell height and sampling sites. c Relationship of calcite layer thickness with sampling year, shell height and sampling sites. d Relationship of aragonite layer thickness with sampling year, shell height and sampling sites. Loess smoothing curves indicate trends for the whole dataset (red) and for samples collected at Zeebrugge only (blue). Sampling site abbreviations from west to east: OOS Oostende, BLA Blankenberge, ZEE Zeebrugge, DUI Duinbergen, KNO Knokke, ZWA Zwarte Polder, ZOU Zoutelande. Boxplot whiskers refer to the 1.5 interquartile range.

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