Life history traits of a temporary water ostracod Heterocypris incongruens (Crustacea, Ostracoda) are affected by power frequency (50 Hz) electromagnetic environmental pollution

Figures & data

Table I. Statistics of two-way crossed PERMANOVA (Pseudo-F value and p(perm) value) testing in the balanced design for effects of incubation condition treatments (IN), hatching condition treatments (HA) and their interaction (IN x HA) on the dynamics of hatchability (similarity between cumulative hatching curves), the total hatching success (proportion of resting eggs that hatched), and the juvenile survival to the adult stage of Heterocypris incongruens in the exposure of intense electric (EF) and magnetic (MF) fields versus control conditions (C). Data are mean and standard error (SE)

		Hatchability				Hatching success				Juvenile survival
Effect		Mean	SE	Pseudo-F	p(perm)	Mean	SE	Pseudo-F	p(perm)	Mean	SE	Pseudo-F	p(perm)
Electric field (EF) vs. Control (C)
IN	C	0.196	0.016	0.757	0.536	0.434	0.018	0.058	0.828	0.417	0.090	6.148	0.029*
	EF	0.161	0.011			0.429	0.015			0.167	0.048
HA	C	0.190	0.016	1.604	0.187	0.450	0.012	2.774	0.112	0.350	0.093	1.339	0.263
	EF	0.168	0.011			0.414	0.019			0.233	0.064
IN x HA	C x C	0.233	0.026	2.210	0.089	0.472	0.018	3.260	0.084	0.533	0.143	1.339	0.257
	C x EF	0.160	0.014			0.397	0.022			0.300	0.100
	EF x C	0.147	0.013			0.428	0.009			0.167	0.062
	EF x EF	0.175	0.018			0.431	0.030			0.167	0.080
Magnetic field (MF) vs. Control (C)
IN	C	0.195	0.019	0.875	0.420	0.477	0.011	0.029	0.872	0.517	0.087	8.526	0.008**
	MF	0.144	0.008			0.474	0.013			0.217	0.058
HA	C	0.182	0.017	9.409	0.002**	0.472	0.011	0.134	0.723	0.433	0.085	1.684	0.193
	MF	0.157	0.014			0.478	0.013			0.300	0.084
IN x HA	C x C	0.233	0.026	0.384	0.726	0.472	0.018	0.047	0.830	0.533	0.143	0.947	0.350
	C x MF	0.158	0.026			0.482	0.012			0.500	0.113
	MF x C	0.132	0.011			0.472	0.012			0.333	0.084
	MF x MF	0.156	0.012			0.475	0.025			0.100	0.045

* - statistically significant differences at 0.01 < p(perm) ≤ 0.05

** - statistically significant differences at 0.001 < p(perm) ≤ 0.01.

Figure 1. Cumulative hatching curves for Heterocypris incongruens resting eggs as a function of time in control and in magnetic field hatching conditions. Lines show mean cumulative hatching success of 12 replicates per each of the two treatments of hatching conditions without differentiation between the incubation conditions; whiskers display 1 × SE (standard error)