Morphological variability of Aulacoseira granulata (Ehr.) Simonsen (Bacillariophyceae) in the Lower Paraná River (Argentina)
In this paper we consider the morphological variation within a natural population of Aulacoseira granulata (Ehr.) Simonsen in relation to environmental factors. This species was dominant in the phytoplankton of the Lower Paraná River (Argentina) and exhibited seasonal fluctuations of cell dimensions...
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2001
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| LEADER | 08805caa a22008057a 4500 | ||
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| 001 | PAPER-20724 | ||
| 003 | AR-BaUEN | ||
| 005 | 20241125130216.0 | ||
| 008 | 190411s2001 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-0034778749 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a O'Farrell, Inés | |
| 245 | 1 | 0 | |a Morphological variability of Aulacoseira granulata (Ehr.) Simonsen (Bacillariophyceae) in the Lower Paraná River (Argentina) |
| 260 | |c 2001 | ||
| 270 | 1 | 0 | |m O'Farrell, I.; Lab. Limnología, Dpto. Biología, Faculdad de Ciencias Exactas y Nat, Buenos Aires C1428EHA, Argentina; email: ines@bg.fcen.uba.ar |
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| 504 | |a Carignan, R., Planas, D., Recognition of nutrient and light limitation in turbid mixed layers: Three approaches compared in the Paraná floodplain (Argentina) (1994) Limnol Oceanogr, 39, pp. 580-596 | ||
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| 506 | |2 openaire | ||
| 520 | 3 | |a In this paper we consider the morphological variation within a natural population of Aulacoseira granulata (Ehr.) Simonsen in relation to environmental factors. This species was dominant in the phytoplankton of the Lower Paraná River (Argentina) and exhibited seasonal fluctuations of cell dimensions. The mean cell diameter was directly correlated with the river water level and inversely with pH and nitrate concentrations, whereas cell length was directly correlated with transparency and nitrate concentration and inversely with suspended solids. This pattern was similar to that observed for filament length. The cell length: Diameter ratio was inversely related to water level and discharge and directly related to pH, transparency, and nitrate concentration. Maximum diameters did not coincide with maximum lengths. A tendency to maintain cell volume throughout the annual cycle was observed, which probably relates to both buoyancy and photosynthetic capacity. These results associate the water ascendancy and the size recovery phases to discharge. Cells become smaller on the ebbing of the flood phase, and the decreasing depth increases the probability that the alga will be disentrained from the turbulent field. The loss during low water would act as a stimulus for auxosporulation, contributing to the production of large cells to start off the next population. |l eng | |
| 593 | |a Lab. Limnología, Dpto. Biología, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina | ||
| 651 | 4 | |a SOUTH AMERICA | |
| 651 | 4 | |a ARGENTINA | |
| 690 | 1 | 0 | |a AULACOSEIRA GRANULATA |
| 690 | 1 | 0 | |a CELL MORPHOLOGY |
| 690 | 1 | 0 | |a DIATOMS |
| 690 | 1 | 0 | |a PHYTOPLANKTON |
| 690 | 1 | 0 | |a DIATOM |
| 690 | 1 | 0 | |a FRESHWATER ECOSYSTEM |
| 690 | 1 | 0 | |a MORPHOLOGY |
| 690 | 1 | 0 | |a PHYTOPLANKTON |
| 690 | 1 | 0 | |a PARANA RIVER |
| 690 | 1 | 0 | |a AULACOSEIRA GRANULATA |
| 700 | 1 | |a Tell, G. | |
| 700 | 1 | |a Podlejski, A. | |
| 773 | 0 | |d 2001 |g v. 2 |h pp. 65-71 |k n. 2 |p Limnology |x 14398621 |t Limnology | |
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