Table 1. Correlations between microphytobenthic biomass and gastropod densities and diets.

		MPB	T. granifera density	Native density	T. granifera MPB diet	Native MPB diet
MPB	r	1	−0.211	−0.021	0.615	0.49
	p		ns	ns	<0.001	<0.05
T. granifera density	r	−0.211	1	−0.232	0.036	−0.330
	p	ns		ns	ns	<0.05
Native density	r	−0.021	−0.232	1	−0.114	0.354
	p	ns	ns		ns	<0.05
T. granifera MPB diet	r	0.615	0.036	−0.114	1	0.649
	p	<0.001	ns	ns		<0.001
Native MPB diet	r	0.409	−0.330	0.354	0.649	1
	p	<0.05	<0.05	<0.05	<0.001

Pearson correlations (r is the correlation coefficient; n = 60 for every case) between microphytobenthic (MPB) biomass, Tarebia granifera, native gastropod densities and corresponding contribution of MPB to their diets. Diets were estimated by a stable isotope mixing model. Samples were collected at three coastal lakes in Maputaland. Native gastropods were Haminoea natalensis, Assiminea cf. ovata, Bulinus natalensis and Melanoides tuberculata.