ABSTRACT
The presence of microscopic algae of the classes Chlorophyceae and Trebouxiophyceae in lotic environments stands out for its high morphologic diversity and its capacity to indicate the quality of the water. This study had the objective of accomplishing the taxonomic survey of rivers from the area of influence of Baixo Iguaçu’s hydroelectric power plant. The monthly samples were collected from january of 2019 to december of 2019 allowing the identification of 55 taxons, distributed in eight families Hydrodictyaceae, Scenedesmaceae, Selenastraceae, Sphaeropleaceae, Volvocaceae, Chlorellaceae, Oocystaceae and Trebouxiophyceae incertae sedis. Between the identified taxa, 12 are new citations for Paraná State: Monactinus simplex var. echinulatum (Wittrock) Pérez, Monactinus simplex var. sturmii (Reinsch) Pérez, Pseudopediastrum boryanum var. longicorne (Reinsch) Tsarenko, Desmodesmus lefevrei (Deflandre) S.S.An, T.Friedl & E.H.Hegewald, Desmodesmus opoliensis var. carinatus (Lemmermann) E.Hegewald, Desmodesmus perforatus (Lemmermann) E.Hegewald, Pectinodesmus javanensis (Chodat) E.Hegewald, Scenedesmus acunae Comas Gonzáles, Quadrigula closterioides (Bohlin) Printz, Volvox globator Linnaeus, Actinastrum aciculare f. minimum (Huber-Pestalozzi), Actinastrum hantazschii var. subtile Woloszynska.
Keywords:
microalgae; rivers; subtropical; taxonomy
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Figure 1. Location of the sampling in the rivers Andrada, Capanema, Gonçalves Dias, Iguaçu, Monteiro, Silva Jardim and Santo Antônio from the Baixo Iguaçu Hydroelectric Power Plant, Paraná State, Brazil. 1a. Médio rio Iguaçu; 1b. Baixo rio Iguaçu; 1c. Médio rio Andrada; 1d. Alto rio Andrada; 1e. Médio rio Capanema; 1f. Alto rio Capanema; 1g. Alto rio Monteiro; 1h. Jusante da barragem da UHE Baixo Iguaçu; 1i. Alto rio Gonçalves Dias; 1j. Médio rio Gonçalves Dias;1k. Foz do rio Gonçalves Dias 1l. Foz do rio Silva Jardim; 1m. Foz do rio Santo Antônio (Fonte: INEO/GERPEL 2022).
Figure 2-31. 2. Pandorina morum; 3. Volvox globator 4. Lacunastrum gracillimum; 5. Monactinus simplex; 6. Monactinus simplex var. echinulatum; 7. Monactinus simplex var. sturmii; 8. Parapediastrum biradiatum; 9. Pediastrum duplex; 10. Pseudopediastrum boryanum var. longicorne; 11. Sorastrum americanum; 12. Stauridium tetras; 13. Coelastrum astroideum; 14. Coelastrum microporum; 15. Coelastrum proboscideum; 16. Coelastrum pulchrum; 17. Coelastrum reticulatum var. cubanum; 18. Comasiella arcuata var. platydisca; 19. Desmodesmus abundans; 20. Desmodesmus armatus var. bicaudatus; 21. Desmodesmus denticulatus; 22. Desmodesmus intermedius; 23. Desmodesmus intermedius var. acutispinus; 24. Desmodesmus lefevrei; 25. Desmodesmus maximus; 26. Desmodesmus opoliensis; 27. Desmodesmus opoliensis var. carinatus; 28. Desmodesmus perforatus; 29. Desmodesmus protuberans; 30. Desmodesmus serratus; 31. Dimorphococcus lunatus.
Figure 32-56 32. Pectinodesmus javanensis; 33. Pectinodesmus regularis; 34. Scenedesmus acunae; 35. Scenedesmus obtusus; 36. Tetradesmus dimorphus; 37. Tetradesmus lagerheimii; 38. Tetrallantos lagerheimii; 39. Ankistrodesmus densus; 40. Ankistrodesmus falcatus; 41. Ankistrodesmus fusiformis; 42. Kirchneriella lunaris; 43. Messastrum gracile; 44. Monoraphidium minutum; 45. Pseudokirchneriella elongata; 46. Quadrigula closterioides; 47. Selenastrum bibraianum;48. Golenkinia radiata; 49. Actinastrum aciculare f. minimum; 50. Actinastrum hantazschii var. subtile; 51. Golenkiniopsis solitaria; 52. Micractinium bornhemiense; 53. Micractinium pusillum; 54. Oocystis marssonii; 55. Willea apiculata; 56. Lemmermannia tetrapedia.