Bacillariophyceae


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Bacillariophyceae

the diatoms, a class within the division Chrysophyta. They are unicellular and occur in both marine and freshwater environments; their silicified cell walls are preserved in diatomaceous earth and peat. Diatoms are one of the most important PRIMARY PRODUCERS in the sea and are responsible for the formation of petroleum deposits.
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Ekeh and Sikoku [11] also reported abundant level of Bacillariophyceae in the lower reach of the estuary.
25 Bacillariophyceae Diatomella spp 692 464 752 646 634 441 Denticula thernalis sp 639 613 705 568 844 553 Coscinodiscus spp 639 481 659 369 706 407 Aulocadiscus spp 368 194 481 174 498 518 Actinocydus spp 438 278 593 505 447 316 Melosira granulate 1001 826 1934 1000 1030 841 Tribonema spp 830 617 898 448 849 216 Nitizohia spp 1670 908 1706 944 1449 908 Fraqlatia spp 1604 914 1348 905 1403 911 Bacillaria spp 1401 846 898 706 1340 941 No.
2008) Also, in the Upper Parana River floodplain, Rodrigues and Bicudo (2001) reported that the Bacillariophyceae is the richest and most dense class.
During winter, Bacillariophyceae dominance was recorded, but density of other groups, such as Cyanophyceae, Chlorophyceae and Zygnemaphyceae, was, in general, higher than densities registered during summer, mainly in intermediate and lower zones.
Summer Winter Total Up Int Low Up Int Low Bacillariophyceae 50 37 39 67 55 39 100 Zygnemaphyceae 28 28 23 35 31 21 64 Chlorophyceae 24 31 19 15 18 16 44 Oedogoniophyceae 4 3 4 2 3 3 4 Xanthophyceae 2 2 3 3 3 0 3 Chrysophyceae 1 2 1 4 5 2 6 Rhodophyceae 0 1 0 0 0 0 1 Dinophyceae 1 1 1 1 1 0 1 Euglenophyceae 3 9 4 12 6 3 22 Craspedomonadophyceae 1 0 0 1 0 1 2 Cyanophyceae 19 27 22 15 22 13 50 Total 133 141 116 155 144 98 297
A 500 m a montante, as classes algais mais representativas no rio do Corvo foram Bacillariophyceae (90%), Cyanophyceae (5%), Zygnemaphyceae (2%) e Chlorophyceae (1,6%); no rio Guairaca, a ordem foi Bacillariophyceae (70%), Zygnemaphyceae (10%), Cyanophyceae (9,6%) e Chlorophyceae (4%).
Ja na regiao em frente ao local de instalacao dos tanques-rede, a classe Bacillariophyceae (95%) representou quase a totalidade da comunidade perifitica no rio do Corvo, seguida por Zygnemaphyceae (2%) e Chlorophyceae (1,6%).
Na estacao 500 m a jusante, Bacillariophyceae (90%), Chlorophyceae (2,6%), Zygnemaphyceae (2%) e Cyanophyceae (1,6%) foram as mais representativas no rio do Corvo; Bacillariophyceae (57%), Chlorophyceae (18,7%), Cyanophyceae (14,4%) e Zygnemaphyceae (10%), no rio Guairaca (Figura 5).
000 m a jusante, as classes algais mais representativas no rio do Corvo foram Bacillariophyceae (90,5%), Cyanophyceae (3,1%), Zygnemaphyceae (3%), Chlorophyceae (1,6%), enquanto no rio Guairaca, a ordem foi Bacillariophyceae (55%), Chlorophyceae (23%), Cyanophyceae (17,7%) e Zygnemaphyceae (2,1) (Figura 5).
Em ambos os ambientes, a classe Bacillariophyceae (diatomaceas) apresentou maior numero de especies e maior abundancia, seguida da classe Chlorophyceae e Zygnemaphyceae, dependendo da estacao analisada.
0,683 0,880 -0,731 total da comunidade Cyanophyceae(Cya) -0,778 0,785 -0,702 -0,780 Oedogoniophyceae 0,666 Ulothricophyceae 0,650 Bacillariophyceae Zygnemaphyceae 0,687 Chlorophyceae (Ch1) -0,765 0,659 0,710 -0,935 Symchocystís sy.
Chroococcaceae não identificada Phormidiaceae não identificada Pseudanabaenaceae não identificada BACILLARIOPHYCEAE Achnanthidium minutissimum (Kutz.