Relationship between Palmatolepis 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).