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Average proportion of embryos surviving to hatching when exposed to five experimental levels of UV-B (kJ m−2) in the presence (filled circles) and absence (open circles) of photorepair radiation (PRR) for (a) R. cascadae (RACA), (b) P. regilla (PSRE), (c) A. macrodactylum (AMMA) and (d) A. gracile (AMGR). Solid line represents the best-fit nonlinear model for each series of experiments. Data are plotted as means±1 s.e.
