Table 2. Statistical results of logistic regression of egg/ephippium presence versus body size and year for all three Cladocera species (egg/ephippium presence = constant + body length + year). Positive estimate of the year parameter means that probability of having eggs increases with time at a given body size, and that size at first reproduction is decreasing (see also Fig. 5). Statistically significant P-values are written in bold.
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