Relationship between <i>Palmatolepis</i> shape and disparity, and paleoenvironmental variations.

Correlations between the paleoenvironmental proxy (∂18O) and Palmatolepis mean shape (PC1), total disparity (DispTot), group disparity (DispGp) and (sub)species disparity (DispSp) were calculated using linear regressions (lin) and Spearman rank-order correlation (SRO). For both, the number of items (N), the coefficient of correlation (R) and the probability of the correlation (P) are provided. A star (*) indicates values calculated without the specimens of Pa. (Pa.) linguiformis added to the one of Coumiac. To the left, values based on raw data; to the right, values based on detrended data (first order difference, i.e. differences between successive samples). The correlations have been estimated for the whole record (Total), its first part corresponding to non-oriented climatic fluctuations (Part 1, from rhenana to triangularis), and on its second part marked by a cooling trend (Part 2, from crepida to praesulcata).