Physico-chemical characteristics of biotope and sediment texture of invasive aquatic plants in the lower Nyong River at Lokoundjé in the Ocean Division (South-Cameroon)
Paper Details
Physico-chemical characteristics of biotope and sediment texture of invasive aquatic plants in the lower Nyong River at Lokoundjé in the Ocean Division (South-Cameroon)
Abstract
The objective of this study was to provide information on the habitat characteristics of these plants that facilitate their recovery. To this end, a total of 16 monthly samples were taken at each of the three stations: Dikobé (DIK), Donenda (DON) and Béhondo (BEH). Water and bottom substrate samples were collected and examined using appropriate analytical methods. Depending on the sites and seasons, a significant variation exist in temperature (T°C) from 31.1 to 32°C; salinity from 0.01 to 25.57 ‰; total dissolved solids (TDS) from 0.011 to 20.14 mg/l; electrical conductivity from 0.023 to 38.42 μS/cm; pH from 7.09 to 8.96 and dissolved oxygen from 2.92 to 5.96 mg/l. Sediment analyzes reveal very high values of total phosphorus (689 to 1286 mg / kg) at the 3 stations compared to lower values of total nitrogen at these same stations. Total Organic Carbon (TOC), Organic matter (OM) and total nitrogen, BEH has the lowest value while DON has the high value. The results of the sedimentary profile revealed that the soil at Dikobe had a clay-silt texture on the 30 cm studied. At DON, the texture in the first 10 cm was silty-sandy, clayey-silt from 10 to 20 cm and clayey in the last 10 cm. At Béhondo, the texture was clayey from 0 to 8.5 cm and sandy up to 30 cm. These results are important for a better understanding of the expansion of invasive aquatic plants.
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