NDLI: Phytoplankton of the Middle Paraná River During an Anomalous Hydrological Period: A Morphological and Functional Approach

Content Provider	Springer Nature Link
Author	Devercelli, Melina
Copyright Year	2006
Abstract	The Paraná River mainstem was sampled monthly (November 1999–December 2000) in order to analyse phytoplankton structure and dynamics during a period of extreme low water discharge. Physiognomic groups, size fractions, taxonomic groups, species and Reynolds et al. [2002, Journal of Plankton Research, 24: 417–428] functional groups were studied in relation to environmental variables. The phytoplankton comprised an unusual development of small unicellular flagellates (1–20 mm), whereas large size algae such as the commonly recorded Aulacoseira were present with very low abundances. Groups Y (Cryptomonas spp.), X2 (Chlamydomonas spp., Rhodomonas minuta followed by a silicean chrysophyte) and D (Skeletonema cf. subsalsum and small centrics in minor proportion) dominated the phytoplankton community. Groups X2 and Y dominated at drought phase (November–December 1999). During the coupling of increasing waters and high-suspended solids (February–May 2000) minimum abundance was exhibited. The highest densities were registered during mid-waters (Y, D, X2) when a constant river-floodplain feedback occurred (September–December). The connectivity between the main channel and its alluvial valley, and their interaction resulting from the regular alternation of hydrological fluctuations, play a steering role in structuring the potamoplankton of large rivers. The multivariate RDA showed that water discharge and transparency highly explained a significant proportion of the functional groups variation. The functional classification is proposed as a useful approach in reconstructing the phytoplankton community. The differences in structure from the typically described potamoplankton for the Paraná were maintained throughout the study period. The perseverance of the community changes that occurred during the drought depends, in part, on the persistence and magnitude of this anomalous phase.
Starting Page	465
Ending Page	478
Page Count	14
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	563
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-04-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	potamoplankton dynamics structure functional groups drought large rivers Ecology Hydrobiology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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