Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil)

OLIVEIRA, FÁBIO H.P.C. DE; ARA, ANDRÉ L.S. CAPELA E; MOREIRA, CESAR H.P.; LIRA, OSMAN O.; PADILHA, MARIA DO ROSÁRIO F.; SHINOHARA, NEIDE K.S.

doi:10.1590/0001-3765201420140128

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Biological Sciences • An. Acad. Bras. Ciênc. 86 (04) • Dec 2014 • https://doi.org/10.1590/0001-3765201420140128 linkcopy

Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil)

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstracts

This study investigated the water quality in an urban eutrophic reservoir in Northeastern Brazil, considering the influence of seasonality. Monthly, samples were collected in the sub-surface reservoir. The following abiotic variables were analyzed: temperature, pH, dissolved oxygen, apparent color, turbidity, conductivity, fluoride, total nitrogen, chlorides, total dissolved solids, total hardness, iron, copper, manganese, aluminum, chlorophyll-a and phaeophytin. Total and thermotolerant coliforms were analyzed according to APHA (2012). Cyanobacteria density was quantified through its biomass. The data were analyzed using one- way ANOVA and Pearson correlation test. Higher values mean phytoplankton biomass (26.3mm³.L^–1) occurred in the dry season, especially Planktothrix agardhiiand Geiterinema amphibium, which occurred in 100% of samples. High trophic state index was detected throughout the year. Seasonality exerted some influence on both biotic and abiotc variables, leading to changes in water quality of the reservoir.

coliforms; cyanobacteria; reservoir; trophic state

Variables	Dry Period				Rainy Period
Variables	Min	Max	Average (n=12)	DP	Min	Max	Average (n=12)	SD
pH	7.0	7.6	7.4	0.3	6.7	6.9	6.8	0.1
Euphotic zone - Zeu (m)	0.62	1.19	0.88	0.23	1.14	1.38	1.26	0.17
Temperature (°C)	27.5	29.0	28.3	0.7	27.0	30.0	28.6	1.3
Dissolved Oxygen - DO (mg.L^–1)	6.1	8.2	7.1	1.1	5.0	8.0	6.3	1.6
Apparent color (UH)	34	164	104	65	66	80	73	7
Turbidity (NTU)	38.0	42.1	40.4	1.7	17.3	28.8	23.1	3.8
Conductivity (µS.cm^–1)	877	1,164	1,003	147	993	1,422	1,161	229
Fluoride (mg.L^–1)	0.0	0.5	0.15	0.27	0.0	0.0	0.0	0.0
Total nitrogen - NT (µmol)	1.9	7.3	5.1	2.9	8.9	14.3	11.3	2.7
Total phosphorus-TP (µmol)	0.25	0.97	0.50	0.15	0.09	0.64	0.37	0.10
Chlorophyll-a (µg.L^–1)	198	230	210	13	150	210	185	22
Phaeophytin (µg.L^–1)	3.7	49.2	25.6	30.5	16.0	26.3	22.2	4.5
Chlorides (mg.L^–1)	263	1,749	854	788	53	440	281	202
Total Dissolved Solids - TDS (mg.L^–1)	579	768	666	96	655	939	766	151
Hardness (mg.L^–1)	57	100	74	23	42	62	52	10
Iron (mg.L^–1)	0.32	0.37	0.35	0.03	0.34	0.45	0.41	0.06
Copper (mg.L^–1)	0.00	0.51	0.27	0.26	0.26	0.30	0.29	0.02
Manganese (mg.L^–1)	0.09	1.10	0.73	0.56	1.10	1.50	1.23	0.23
Aluminum (mg.L^–1)	0.05	0.13	0.09	0.04	0.03	0.11	0.06	0.05
TN:TP ratio	1.44	5.58	3.95	2.19	6.84	10.98	8.68	2.11
Trophic State index - TSI	80.6	82.1	81.0	1.1	79.1	79.7	79.3	0.4

Taxon	DS	RS
Oscillatoriales
Geitlerinema amphibium (C. Agardh) Anagnostidis	0.9	0.6
Planktothrix agardhii (Gomont) Anagnostidis and Komárek	24.9	5.3
Chroococcales
Merismopedia tenuissima Lemmermann	0.1	+
Microcystis aeruginosa (Kützing) Kützing	0.4	0.2
Nostocales
Cylindrospermopsis raciborskii(Woloszynska) Seenaya and Suba Raju	-	0.2

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