Primary producers in a Pampean stream: Temporal variation and structuring role
Low current velocities, high nutrient levels, the lack of riparian forest vegetation, and the development of dense and rich macrophyte communities characterize Pampean streams. The objective of this study was to describe the main physical, chemical, and biological characteristics of a headwater Pamp...
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2005
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09603115_v14_n7_p1699_Giorgi http://hdl.handle.net/20.500.12110/paper_09603115_v14_n7_p1699_Giorgi |
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paper:paper_09603115_v14_n7_p1699_Giorgi2023-06-08T15:57:37Z Primary producers in a Pampean stream: Temporal variation and structuring role Current velocity Herbivores Macrophytes Phytobenthos Streams community structure phytobenthos primary production riparian forest stream temporal variation Argentina Pampas South America Western Hemisphere World algae Amphipoda Gastropoda Invertebrata Lemna gibba Low current velocities, high nutrient levels, the lack of riparian forest vegetation, and the development of dense and rich macrophyte communities characterize Pampean streams. The objective of this study was to describe the main physical, chemical, and biological characteristics of a headwater Pampean stream as well as to analyze the role of macrophytes and phytobenthos. The study was conducted in a stream considered to be not much disturbed by human activities. Samples of water and organisms (macrophytes, benthic algae and invertebrates) were taken monthly for 14 months in two sampling stations, in fast flow and slow flow sites. Macrophyte biomass and diversity increased in spring and summer, and they decreased in autumn, when the plant community was greatly affected by an important flood. Phytobenthos biomass was lower in late summer, possibly due to the establishment of a dense cover of the floating macrophyte Lemna gibba L. Density of amphipods and gastropods greatly increases in spring and summer, jointly with the macrophyte development. Analysis of correlation showed that current velocity is the most important factor influencing macrophyte biomass and phytobenthos structure, while depth, nutrients, and herbivores are linked factors. Pampean streams could be considered systems dynamically fragile, because habitat heterogeneity is generated by aquatic vegetation, a substratum that varies along time. © Springer 2005. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09603115_v14_n7_p1699_Giorgi http://hdl.handle.net/20.500.12110/paper_09603115_v14_n7_p1699_Giorgi |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Current velocity Herbivores Macrophytes Phytobenthos Streams community structure phytobenthos primary production riparian forest stream temporal variation Argentina Pampas South America Western Hemisphere World algae Amphipoda Gastropoda Invertebrata Lemna gibba |
| spellingShingle |
Current velocity Herbivores Macrophytes Phytobenthos Streams community structure phytobenthos primary production riparian forest stream temporal variation Argentina Pampas South America Western Hemisphere World algae Amphipoda Gastropoda Invertebrata Lemna gibba Primary producers in a Pampean stream: Temporal variation and structuring role |
| topic_facet |
Current velocity Herbivores Macrophytes Phytobenthos Streams community structure phytobenthos primary production riparian forest stream temporal variation Argentina Pampas South America Western Hemisphere World algae Amphipoda Gastropoda Invertebrata Lemna gibba |
| description |
Low current velocities, high nutrient levels, the lack of riparian forest vegetation, and the development of dense and rich macrophyte communities characterize Pampean streams. The objective of this study was to describe the main physical, chemical, and biological characteristics of a headwater Pampean stream as well as to analyze the role of macrophytes and phytobenthos. The study was conducted in a stream considered to be not much disturbed by human activities. Samples of water and organisms (macrophytes, benthic algae and invertebrates) were taken monthly for 14 months in two sampling stations, in fast flow and slow flow sites. Macrophyte biomass and diversity increased in spring and summer, and they decreased in autumn, when the plant community was greatly affected by an important flood. Phytobenthos biomass was lower in late summer, possibly due to the establishment of a dense cover of the floating macrophyte Lemna gibba L. Density of amphipods and gastropods greatly increases in spring and summer, jointly with the macrophyte development. Analysis of correlation showed that current velocity is the most important factor influencing macrophyte biomass and phytobenthos structure, while depth, nutrients, and herbivores are linked factors. Pampean streams could be considered systems dynamically fragile, because habitat heterogeneity is generated by aquatic vegetation, a substratum that varies along time. © Springer 2005. |
| title |
Primary producers in a Pampean stream: Temporal variation and structuring role |
| title_short |
Primary producers in a Pampean stream: Temporal variation and structuring role |
| title_full |
Primary producers in a Pampean stream: Temporal variation and structuring role |
| title_fullStr |
Primary producers in a Pampean stream: Temporal variation and structuring role |
| title_full_unstemmed |
Primary producers in a Pampean stream: Temporal variation and structuring role |
| title_sort |
primary producers in a pampean stream: temporal variation and structuring role |
| publishDate |
2005 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09603115_v14_n7_p1699_Giorgi http://hdl.handle.net/20.500.12110/paper_09603115_v14_n7_p1699_Giorgi |
| _version_ |
1768542996704264192 |