Spatial and temporal limnological changes of an aquaculture area in a neotropical reservoir

Free Access

Table 3

Variations in the vertical water parameters for biochemical oxygen demand (BOD), chlorophyll a (Chla), total phosphorus (TP), orthophosphate (Ortho), and ammonia in relation to seasons and water layers.

		Seasons				p-value

Variables	Layers	Spring	Summer	Autumn	Winter	L	S	I
BOD (mg L⁻¹)	Bottom	3.7 ± 2.1^bA	2.6 ± 1.7^bA	6.4 ± 2.5^aA	6.3 ± 1.2^aA	0.59	0.00	0.01
BOD (mg L⁻¹)	Surface	4.1 ± 1.6^bA	1.7 ± 1.4^bA	3.9 ± 2.2^bB	8.3 ± 1.5^aA
Chla (μg L⁻¹)	Bottom	5.1 ± 2.9ª^A	1.8 ± 1.4^bA	1.8 ± 0.5^bA	4.4 ± 1.7^abA	0.43	0.00	0.69
Chla (μg L⁻¹)	Surface	6.2 ± 2.8ª^A	1.4 ± 1.3^bA	2.5 ± 1.1^bA	4.7 ± 2.0^abA
TP (μg L⁻¹)	Bottom	43.9 ± 0.0^aA	8.5 ± 0.0^bA	19.4 ± 0.0^abA	22.4 ± 0.0^abA	0.56	0.00	0.93
TP (μg L⁻¹)	Surface	47.7 ± 0.0^aA	7.6 ± 0.0^bA	20.8 ± 0.0^abA	29.8 ± 0.0^abA
Ortho (μg L⁻¹)	Bottom	41.8 ± 0.0ª^A	22.2 ± 0.0^bA	8.3 ± 0.0^dA	15.8 ± 0.0^cdA	0.03	0.00	0.52
Ortho (μg L⁻¹)	Surface	40.2 ± 0.0^aA	18.9 ± 0.0^bA	3.8 ± 0.0^dA	15.4 ± 0.0^cdA
Ammonia (μg L⁻¹)	Bottom	18.5 ± 0.0^bA	95.8 ± 0.0ª^A	88.8 ± 0.0ª^A	0.1 ± 0.0^bA	0.64	0.00	0.90
Ammonia (μg L⁻¹)	Surface	16.8 ± 0.0^bA	96.3 ± 0.0ª^A	80.3 ± 0.0ª^A	0.1 ± 0.0^bA

Different lowercase letters in the same row for each parameter indicate statistical difference (p < 0.05).

Different uppercase letters in the same column for each parameter indicate statistical difference (p < 0.05).

L = Layers.

S = Seasons.

I = Interaction.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.