Table 1 Multivariate and univariate results of PERMANOVA a posteriori pairwise comparisons of element concentrations between shell “mineral layers” (da - dissoconch aragonite, dc – dissoconch calcite) in relation to “valve orientation” (Rv - calcite facing upwards (outer surface), Lv – aragonite facing upwards (inner surface), refer to sketch on Fig. 3).

	All Elements	Mg:Ca	Sr:Ca	Pb:Ca	U:Ca	Ba:Ca
Within “valve orientation”, between “mineral layers”
Rv_da, Rv_dc	6.404****	7.537****	8.433****	4.779****	8.792****	2.118*
Lv_da, Lv_dc	1.363^ns	4.676***	0.650^ns	1.948^ns	0.359^ns	0.993^ns
Between “valve orientation”, within “mineral layers”
Rv_da, Lv_da	0.520^ns	2.599*	0.304^ns	0.473^ns	0.407^ns	0.053^ns
Rv_dc, Lv_dc	3.737****	5.651****	8.332****	1.167^ns	8.184****	1.884*
Between “valve orientation”, between “mineral layers”
Rv_dc, Lv_da	5.078****	8.662****	8.152****	3.410**	4.423****	1.594^ns
Rv_da, Lv_dc	1.608*	2.671*	0.357^ns	2.769**	0.0800^ns	1.095^ns

^****P(perm) < 0.0001; ***P(perm) < 0.001; **P(perm) < 0.01; *P(perm) < 0.05; ns: not significant.

Quick links

Search