Knowledge to Ecological Preferences in a Tropical Epiphytic Algae to Use with Eutrophication Indicators

Abstract

In Ayapel floodplain periphyton associated to macrophyte roots on the basis of material was collected in fourteen sampling sites in nine moments of compilation. From the analysis of the samples were recorded 550 algal species, of which 56% were diatoms. Furthermore it was valued relative abundances of taxa and the average physicochemical variables to identify the optimal values and tolerance ranges of species. In the case of nitrates optimal value was below 2 mg/L for all algae except for Actinella sp. and Euastrum sinuosum which optimal values were close to zero with low variability. Regarding all species the algal nitrite concentration showed optimum values below 2 mg/L except Encyonema minutum and E. sinuosum whose optimum were 0.4 and 0.5 mg/L respectively. About nitrogen as ammonia was repeated the above situation, i.e. optimum values below 2 mg/L except for E. minutum and E. sinuosum. Respect to phosphorus the species with optimum greater than 0.6 mg/L are the diatoms, in contrast, the lowest values were optimal for E. sinuosum and Actinella sp. From the viewpoint of bioindication high abundance of Synedra goulardii indicates high transparency, Ulnaria ulna and Planothidium lanceolatum indicate lower concentration of dissolved oxygen and water temperature between 29˚C-30˚C, Actinella aff. robusta, E. minutum, Cylindrospermopsis raciborski, Lyngbya cf. limnetica, Eunotia naegueli, Navicula cryptocephala, Diadesmis confervaceae, Frustulia rhomboides and Aulacoseira granulata. Indicating low electrical conductivity (<100 µS/cm), Synedra goulardii indicating neutral waters, Actinella eunotioides and Euastrum sinuosum indicate low nitrate concentration (<0.2 mg/L), Eunotia minor indicating midrange nitrite concentration (0.2-0.5 mg/L), Ulnaria ulna, Planothidium lanceolatum indicating low ammoniacal nitrogen concentration (<0.2 mg/L) and Actinella eunotioides indicating low soluble reactive phosphorus concentration (<0.2 mg/L).

Ecological health evaluation of rivers based on phytoplankton biological integrity index and water quality index on the impact of anthropogenic pollution: A case of Ashi River Basin

“…Human activities have gradually changed the types of land use in river basins, mainly through changes in nutrient enrichment, hydrological regimes, riparian habitat quality, and other ecological processes, resulting in a series of adverse effects on river ecosystems (Chen et al, 2022). With the escalation in anthropogenic stress, the loss of natural land, and the increase in pollutants discharged into rivers, the number of pollution-sensitive phytoplankton species in rivers decreased, and pollution-resistant species became the dominant group (Moghadam, 1975;Montoya-Moreno and Aguirre-Ramírez, 2013). The advantages of using phytoplankton as an IBI over other taxa (benthic diatoms, invertebrates, and fish) include simple collection, wide distribution, sensitivity to changes in aquatic conditions, short community renewal time, rapid response to changes in river water chemistry and habitat quality, and greater predictability of community trends (Zhou et al, 2019).…”

“…Therefore, their presence typically indicates a lightly polluted or non-polluted environment (Moghadam, 1975;Montoya-Moreno and Aguirre-Ramírez, 2013). The dominant species at the sampling sites with "poor" evaluation results mainly included C. meneghiniana, Ulnaria ulna (Kützing) Aboal, Ankistrodesmus falcatus (A. Braun) Korschikoff, and Limnothrix redekei Van Goor, which are common pollution-resistant taxa (Singh et al, 2013;Dwivedi and Srivastava, 2017).…”

Aquatic ecosystem changes in a global biodiversity hotspot: Evidence from the Albertine Rift, central Africa

“…The effects of warming are less evident in the sediments from Muhavura Lake, where in addition to a continued predominance of Brachysira brebissonii and other benthic taxa indicative of slightly acidic waters, Frustulia rhomboides increases in abundance and Gomphonema parvulum makes its first appearance. Both F. rhomboides and G. parvulum are cited as tolerant of nutrient enrichment (Abarca, Jahn, Zimmermann, & Enke, ; Bellinger, Cocquyt, & O'Reilly, ; Montoya‐Moreno & Aguirre‐Ramírez, ). Warmer conditions and a greater availability of nutrients may have brought about an increase in diatom productivity at Bisoke Lake that along with reduced decomposition, owing to a strengthening of stratification (Littke, ), could explain an increased contribution of organic matter to sediments from c. 1860 AD.…”