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dc.contributor.author
Zalocar, Yolanda
dc.date.available
2018-08-07T19:47:50Z
dc.date.issued
2002-03
dc.identifier.citation
Zalocar, Yolanda; Structure and variation of the Paraguay River phytoplankton in two periods of its hydrological cycle; Springer; Hydrobiologia; 472; 3-2002; 177-196
dc.identifier.issn
0018-8158
dc.identifier.uri
http://hdl.handle.net/11336/54485
dc.description.abstract
The structure and distribution of the Paraguay River phytoplankton (between 16° 03′ and 26° 53′ S and between 57° 13′ and 58° 23′ W was studied during June-July/95 and December/95-January/96. Phytoplankton density values were lower in winter (mean value between 731 and 878 ind. ml-1) in summer (between 1113 and 1876 ind. ml-1), and mean biomass (biovolume) ranged between 0.215 and 0.372 mm3 l-1 and between 0.586 and 1.223 mm3 respectively. In all, 332 algal taxa were identified: 298 in the upper section (Pantanal) and 143 in the middle and lower sections. They pertained to the Cyanophyta, Chlorophyta, Euglenophyta, Cryptophyta, Pyrrhophyta, Bacillariophyceae, Chrysophyceae and Xanthophyceae. Small Chlorophyta (Chloromonas gracilis, Choricystis minor, Crucigenia quadrata, Scenedesmus ecornis, Monoraphidium contortum and M. minutum) and Cryptophyta (Cryptomonas marssonii, C. ovata and Rhodomonas minuta) dominated. Bacillariophyceae (genera Aulacoseira and Cyclotella) increased in the lower section of the river. Biomass was dominated by centric forms of the genus Aulacoseira (A. granulata and its morphotypes, and A. herzogii). The diversity index varied between 1.99 and 5.0 bits ind.-1 in winter and between 1.49 and 4.87 bits ind.-1 in summer. Species richness (between 4 and 105 taxa per sample) showed a decrease in north-south direction. The presence of one of the largest wetlands of the world may explain the high algal diversity in the upper section. The Bermejo River, with highly mineralized waters and a high content of suspended solids, causes a strong discontinuity in the lower section of the main course, viz, a decrease in water transparency and in the density, biomass, diversity and species richness values of phytoplankton, before its waters meet the Paraná River.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Biomass
dc.subject
Density
dc.subject
Diversity
dc.subject
Hydrological Cycle
dc.subject
Paraguay River
dc.subject
Phytoplankton
dc.subject.classification
Otras Ciencias Biológicas
dc.subject.classification
Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Structure and variation of the Paraguay River phytoplankton in two periods of its hydrological cycle
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-05-21T17:23:10Z
dc.journal.volume
472
dc.journal.pagination
177-196
dc.journal.pais
Alemania
dc.journal.ciudad
Netherland
dc.description.fil
Fil: Zalocar, Yolanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina
dc.journal.title
Hydrobiologia
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1023/A:1016304803431
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1023%2FA%3A1016304803431
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