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Fig. 3. Breaking strain for threads over time of exposure in four seasons. Symbols
represent means ± s.e.m. values (N=1129). Tests were
performed in a 15°C seawater bath at an extension rate of 10 mm
min1. Note that no testable threads persisted beyond four
weeks during the summer; the value for six weeks exposure was conservatively
estimated from the four-week values (broken line).