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The taxa recorded during the study period were grouped according to their MBFG (Table 2).
During the two first months of this period (July and August, 2008) a wide occurrence of MBFG I, VI and VII was observed.
The diversity index was significantly higher during the second hydrodynamic instability period (H = 3.99), with predominance of unicellular flagellates (MBFG V), represented mainly by Volvox aureus Ehrenberg and the significant occurrence of filamentous species (MBFG III), such as Komvophoron minutum (Skuja) Anagnostidis et Komarek, in addition to colonial species (MBFG VII) represented by Chlorophyceae Coelosphaerium kuetzingianum Nageli and Snowella lacustris (Chodat) Komarek (F).
Analysis of MBFG of phytoplankton x environmental factors
The hydrodynamic changes in the reservoir caused by pluvial anomaly changed the environmental factors, consequently leading to changes in the structure of MBFGs. The FHIP resulted in occurrence of low diversity of species with the dominance of MBFG VII (cyanobacterial colonies with mucilage).
The morphofunctional groups in the Armando Ribeiro Goncalves Reservoir (MBFG VII [right arrow] MBFG III [right arrow] MBFG III/V/VII) during the First Hydrodynamic Instability Period (FHIP), Hydrodynamic Stability Period (HSP) and Second Hydrodynamic Instability Period (SHIP), respectively, demonstrate that the short time interval between one water outflow and another may trigger a series of alterations in the physical, chemical and biological characteristics of the system.
The dominance of filamentous cyanobacterial species (MBFG III) along with frequent bloom events in colonial species (MBFG VII) was reported previously (Chellappa et al., 2009).
In the first months of HSP, the alkaline pH and marked thermal heterogeneity initiated changes characterized from MBFG VII to MBFG III.
(MBFG VII) to filaments with heterocyst, Anabaena circinalis and Aphanizomenon flos-aquae (MBFG III), with subsequent prevalence of filamentous species without heterocyst, Planktothrix agardhii and Geitlerinema splendidum, when there is an increase in ammoniacal nitrogen concentrations.
Stress-tolerant species belonging to MBFG III and MBFG VII, which occur in the FHIP and HSP, may be classified into the three functional phytoplankton categories (C-S-R strategists) of Reynolds (1997), acting successfully during disturbance events and remaining in the system during stable conditions.
An increase in phytoplankton community diversity occurs during the SHIP, where the elevated biomass of potentially toxic cyanobacteria (MBFG III) is replaced by non-toxic species, represented primarily by Volvox aureus (MBFG V), Aulacoseira granulata (MBFG VI) and Coelosphaerium Kuetzingianum (MBFG VII).
Multi-brand/ F: Multi-brand/ Multi-business Multi-business strategy strategy TABLE 3 The 22 Most Important Italian Groups Brand Portfolio/Price Monobrand Multi-brand Segments, and Origin (owned and on license) Pure fashion houses: HC, PAP, Diffusion, Armani, Dolce & Valentino Fashion Group Designers Gabbana, Versace Industry-backed designers: Aeffe, MBFG, Prada HC, PAP, Diffusion, Ferragamo, Loro Gucci, Diesel, IT Holding, Premium Piana, Zegna Max Mara, Miroglio, Tod's Bridge/Mass Geox (a), Reply Benetton, Calzedonia, Golden Lady, Sixty (b) Source: Pambianco Week 8 (14 April 2008): [4-6].
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- Mbeya Medical Research Programme