The benthos of the Middle Paraná river in the Corrientes-Esquina stretch
Quali-quantitative variations of the benthos from the Middle Paraná river course, were studied. Spatial and temporal distribution was analyzed in relation with the main environmental factors. Studies were monthly carried out during March 1981-March 1982 in four stations near the localities of Coment...
Guardado en:
| Autores principales: | , , |
|---|---|
| Formato: | Artículo revista |
| Lenguaje: | Español |
| Publicado: |
Centro de Ecología Aplicada del Litoral (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Nordeste)
2023
|
| Acceso en línea: | https://revistas.unne.edu.ar/index.php/eco/article/view/7108 |
| Aporte de: |
| id |
I48-R154-article-7108 |
|---|---|
| record_format |
ojs |
| spelling |
I48-R154-article-71082023-12-01T21:32:15Z The benthos of the Middle Paraná river in the Corrientes-Esquina stretch El Bentos del Parana Media en el tramo Corrientes-Esquina Bonetto, Argentino A. Varela, María E. Bechara, José A. Quali-quantitative variations of the benthos from the Middle Paraná river course, were studied. Spatial and temporal distribution was analyzed in relation with the main environmental factors. Studies were monthly carried out during March 1981-March 1982 in four stations near the localities of Comentes, Bella Vista, Coya and Esquina. In each of them, four sampling points were stablished in the cross sections of the river. Samples were obtained with a Dietz-LaFond dredge and fíltered through 500 and 150 µm mesh opening screens. The predominant sandy bottoms are inhabited by a specialized psammophilous fauna. The community structure was similar along all the studied stretch. Abundánce was very fluctuant, with maximun valúes of 160.000 ind/m2 with a strong numerical dominance of a species of Oligochaeta: Narapa bonettoi Correlations análysis showed a positive association between the mean grain size and the total abundance. These coeflcients were signiñcatives in all the stations for microturbellarians but only in Goya and Esquina for N. bonettoi Clay bank substraía from the river margins had a richer but less abundant fauna (maximun valúes of 29.000 ind/m2) with predominance of Xenochironomus sp. The benthos of the soft silty bottoms was the least diversé and abundant. Seasonal changes in the abundance were observed. There was an increment in spring and the early summer with a tendency to decrease during summer floods. This pattem was similar in the thxee kinds of bottoms, but more evident in the soft silty ones. Quali-quantitative variations of the benthos from the Middle Paraná river course, were studied. Spatial and temporal distribution was analyzed in relation with the main environmental factors. Studies were monthly carried out during March 1981-March 1982 in four stations near the localities of Comentes, Bella Vista, Coya and Esquina. In each of them, four sampling points were stablished in the cross sections of the river. Samples were obtained with a Dietz-LaFond dredge and fíltered through 500 and 150 µm mesh opening screens. The predominant sandy bottoms are inhabited by a specialized psammophilous fauna. The community structure was similar along all the studied stretch. Abundánce was very fluctuant, with maximun valúes of 160.000 ind/m2 with a strong numerical dominance of a species of Oligochaeta: Narapa bonettoi Correlations análysis showed a positive association between the mean grain size and the total abundance. These coeflcients were signiñcatives in all the stations for microturbellarians but only in Goya and Esquina for N. bonettoi Clay bank substraía from the river margins had a richer but less abundant fauna (maximun valúes of 29.000 ind/m2) with predominance of Xenochironomus sp. The benthos of the soft silty bottoms was the least diversé and abundant. Seasonal changes in the abundance were observed. There was an increment in spring and the early summer with a tendency to decrease during summer floods. This pattem was similar in the thxee kinds of bottoms, but more evident in the soft silty ones. Centro de Ecología Aplicada del Litoral (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Nordeste) 2023-12-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículo revisado por pares application/pdf https://revistas.unne.edu.ar/index.php/eco/article/view/7108 10.30972/eco.12237108 Ecosur; 1985: vol. 12-13, nos. 23-24; 37-57 0325-108X spa https://revistas.unne.edu.ar/index.php/eco/article/view/7108/6545 |
| institution |
Universidad Nacional del Nordeste |
| institution_str |
I-48 |
| repository_str |
R-154 |
| container_title_str |
Revistas UNNE - Universidad Nacional del Noroeste (UNNE) |
| language |
Español |
| format |
Artículo revista |
| author |
Bonetto, Argentino A. Varela, María E. Bechara, José A. |
| spellingShingle |
Bonetto, Argentino A. Varela, María E. Bechara, José A. The benthos of the Middle Paraná river in the Corrientes-Esquina stretch |
| author_facet |
Bonetto, Argentino A. Varela, María E. Bechara, José A. |
| author_sort |
Bonetto, Argentino A. |
| title |
The benthos of the Middle Paraná river in the Corrientes-Esquina stretch |
| title_short |
The benthos of the Middle Paraná river in the Corrientes-Esquina stretch |
| title_full |
The benthos of the Middle Paraná river in the Corrientes-Esquina stretch |
| title_fullStr |
The benthos of the Middle Paraná river in the Corrientes-Esquina stretch |
| title_full_unstemmed |
The benthos of the Middle Paraná river in the Corrientes-Esquina stretch |
| title_sort |
benthos of the middle paraná river in the corrientes-esquina stretch |
| description |
Quali-quantitative variations of the benthos from the Middle Paraná river course, were studied. Spatial and temporal distribution was analyzed in relation with the main environmental factors.
Studies were monthly carried out during March 1981-March 1982 in four stations near the localities of Comentes, Bella Vista, Coya and Esquina. In each of them, four sampling points were stablished in the cross sections of the river. Samples were obtained with a Dietz-LaFond dredge and fíltered through 500 and 150 µm mesh opening screens. The predominant sandy bottoms are inhabited by a specialized psammophilous fauna. The community structure was similar along all the studied stretch. Abundánce was very fluctuant, with maximun valúes of 160.000 ind/m2 with a strong numerical dominance of a species of Oligochaeta: Narapa bonettoi Correlations análysis showed a positive association between the mean grain size and the total abundance. These coeflcients were signiñcatives in all the stations for microturbellarians but only in Goya and Esquina for N. bonettoi
Clay bank substraía from the river margins had a richer but less abundant fauna (maximun valúes of 29.000 ind/m2) with predominance of Xenochironomus sp. The benthos of the soft silty bottoms was the least diversé and abundant.
Seasonal changes in the abundance were observed. There was an increment in spring and the early summer with a tendency to decrease during summer floods. This pattem was similar in the thxee kinds of bottoms, but more evident in the soft silty ones. |
| publisher |
Centro de Ecología Aplicada del Litoral (Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Nordeste) |
| publishDate |
2023 |
| url |
https://revistas.unne.edu.ar/index.php/eco/article/view/7108 |
| work_keys_str_mv |
AT bonettoargentinoa thebenthosofthemiddleparanariverinthecorrientesesquinastretch AT varelamariae thebenthosofthemiddleparanariverinthecorrientesesquinastretch AT becharajosea thebenthosofthemiddleparanariverinthecorrientesesquinastretch AT bonettoargentinoa elbentosdelparanamediaeneltramocorrientesesquina AT varelamariae elbentosdelparanamediaeneltramocorrientesesquina AT becharajosea elbentosdelparanamediaeneltramocorrientesesquina AT bonettoargentinoa benthosofthemiddleparanariverinthecorrientesesquinastretch AT varelamariae benthosofthemiddleparanariverinthecorrientesesquinastretch AT becharajosea benthosofthemiddleparanariverinthecorrientesesquinastretch |
| first_indexed |
2024-08-21T22:38:54Z |
| last_indexed |
2024-08-21T22:38:54Z |
| _version_ |
1808038556910747648 |