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Trends (1982–2016) in the (a) growth rate, (b) beginning of bloom-favourable conditions, (c) termination of bloom-favourable conditions and (d) bloom season length for C. polykrikoides (American/Malaysian ribotype) along the Eastern US using a standard resolution (¼ degree) data product. Stippling indicates regions where trends are statistically significant (p < 0.05; Mann–Kendall test). (Online version in colour.)
