The effects of physicochemical variables and tadpole assemblages on microalgal communities in freshwater temporary ponds through an experimental approach

Table 3 Mean values of environmental variables in small and large artificial ponds following tadpole assemblages

Ponds	Depth (cm)	pH	Ec (μS.cm ⁻¹ )	Visibility (cm)	NO ₃ ⁻ (mg.L ⁻¹ )	PO _4-P (mg.L ⁻¹ )	NH ₄ ⁺ (mg.L ⁻¹ )
Small artificial ponds (n = 75)
ABCD	29.92	7.09	13.78	12.08	0.97	0.18	_0.05
ABC	29.87	7.09	10.06	14.75	0.44	0.25	_0.12
ABD	29.28	7.08	12.30	14.46	0.64	0.14	_0.08
ACD	29.57	7.17	11.26	12.94	0.56	0.20	_0.11
BCD	29.57	7.11	12.07	20.74	0.67	0.18	_0.15
BC	29.66	7.29	5.62	15.38	1.19	0.40	_0.07
BD	29.37	7.33	5.67	21.25	0.88	0.18	_0.11
CD	30.11	7.32	5.53	18.68	0.79	0.33	_0.07
sd	0.10	0.04	1.21	1.24	0.08	0.03	_0.01
Large artificial (n = 75)
ABCD	41.83	7.53	8.29	12.07	1.46	0.15	_0.06
ABC	37.73	7.23	9.31	8.06	2.03	0.24	_0.08
ABD	46.31	7.12	2.80	8.00	0.87	0.11	_0.03
ACD	38.99	7.16	8.60	6.47	2.33	1.82	_0.05
BCD	39.10	7.39	7.53	11.33	2.80	0.60	_0.06
sd	1.53	0.08	1.16	1,07	0.34	0.32	0.01

EC: Conductivity; A: Hoplobatrachus occipitalis; B: Kassina fusca; C: Ptychadena bibroni; D: Phrynomantis microps. n: sample size; sd: standard deviation.