caa a22 4500 445893915 CHVBK 20180317145625.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10750-011-0626-3 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0626-3 Phytoplankton seasonal and vertical variations in a tropical shallow reservoir with abundant macrophytes (Ninféias Pond, Brazil) [Elektronische Daten] [Bárbara Fonseca, Carlos de Mattos Bicudo] This study aimed at analyzing the environmental factors which determine the structure and dynamic of phytoplankton in a shallow reservoir with abundant macrophyte flora, Ninféias Pond (Brazil). It is hypothesized that, although its shallowness, periodic stratifications play an important role on its phytoplankton community. Water samples were collected monthly, from January to December 1997, in four depths (sub-surface, 1m, 2m, and bottom) of pelagic zone (Z max=3.6m). Community seasonal and vertical variations followed a hot-rainy season with water column stratification (phase 1; Q index: medium), alternating with a cool-dry season with water column mixing (phase 2: Q index: excellent). Nanoplanktonic flagellates dominated, mainly mixotrophic species. During phase 1, Chlamydomonas sp. (G) was the main species, dominating at the anoxic and nutrient-rich hypolimnion. At the same time, richness and diversity were relatively lower. During phase 2, lower water temperatures and higher dissolved oxygen concentrations favoured the prymnesiophyte Chrysochromulina cf. breviturrita (X2). Sequence of functional groups over phases 1 and 2 was: phase 1=G→transition=Y/P/E/D/F/W2/X3→phase 2=X2/Lo/X1; most of these groups have been associated to oligo-mesotrophic systems. Seasonal stratifications played a decisive role in determining the structure and dynamic of phytoplankton in the Ninféias Pond. However, in such a complex and heterogeneous system, other compartments of the food web (macrophytes, zooplankton, fishes) may also act as relevant driving forces, in synergy with the physical and chemical environment. Springer Science+Business Media B.V., 2011 Community dynamic and structure nationallicence Stratification nationallicence Functional groups nationallicence Fonseca Bárbara Universidade Católica de Brasília, Curso de Ciências Biológicas (Sala E-10), QS 07, Lote 1, Águas Claras, 71966-700, Brasília, DF, Brazil aut de Mattos Bicudo Carlos Instituto de Botânica, Núcleo de Pesquisa em Ecologia, Caixa Postal 3005, 01061-970, São Paulo, SP, Brazil aut Hydrobiologia Springer Netherlands 665/1(2011-05-01), 229-245 0018-8158 665:1<229 2011 665 10750 https://doi.org/10.1007/s10750-011-0626-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0626-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fonseca Bárbara Universidade Católica de Brasília, Curso de Ciências Biológicas (Sala E-10), QS 07, Lote 1, Águas Claras, 71966-700, Brasília, DF, Brazil aut NATIONALLICENCE 700 1- de Mattos Bicudo Carlos Instituto de Botânica, Núcleo de Pesquisa em Ecologia, Caixa Postal 3005, 01061-970, São Paulo, SP, Brazil aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 665/1(2011-05-01), 229-245 0018-8158 665:1<229 2011 665 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer