Food selection by Plumatella geimermassardi Wood and Okamura, 2004 (Phylactolaemata, Bryozoa) | Knowledge and Management of Aquatic Ecosystems

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Table 2

Concentration of total solids (TS), total dissolved solids (TDS), total suspended solids (TSS) before (pre-exposure) and 24 h after collocation (post-exposure) of active polypides, grazing rate (R_g_r) and clearance rate (CR).

Sampling months		Pre-exposure (mg L⁻¹)	Post-exposure (mg L⁻¹)	R_gr (μg L⁻¹ h⁻¹)	CR (μl ind⁻¹ h⁻¹)
June	TS	229.4 ± 0.2b	132.9 ± 4.7b^*	66.1 ± 9.4a	440.3 ± 62.6a
July	TS	229.9 ± 1.7b	129.9 ± 2.4b^*	56.1 ± 2.2a	374.0 ± 14.7a
August	TS	298.6 ± 0.9a	226.1 ± 6.9a^*	24.8 ± 3.8b	163.3 ± 25.4b
June	TDS	201.7 ± 0.2b	123.5 ± 3.3b^*	20.4 ± 1.1a	136.3 ± 7.4a
July	TDS	199.1 ± 1.8b	116.1 ± 2.2c ^*	22.5 ± 0.7a	149.9 ± 4.6a
August	TDS	250.2 ± 1.0a	191.0 ± 5.9a ^*	11.2 ± 1.2b	75.0 ± 7.9b
June	TSS	27.7 ± 0.2b	9.4 ± 2.0c^*	45.6 ± 8.7a	304.0 ± 57.8a
July	TSS	30.8 ± 0.5b	13.8 ± 0.6b^*	33.6 ± 2.0a	224.1 ± 13.0a
August	TSS	48.4 ± 0.4a	35.1 ± 2.5a^*	13.6 ± 3.3b	90.4 ± 22.3b

Total solids are the sum of inorganic and organic dissolved and suspended solids. Polypides (ind). Mean ± SD. Number of replicates for each sampling month (5). The letters (a, b, c) indicate statistically significant differences between sampling months (p < 0.05).

indicates statistically significant differences before and after collocation of polypides.

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