Martín C. M. Blettler
The impact of significant input of fine sediment on benthic fauna at tributary junctions: a case study of the Bermejo-Paraguay River confluence, Argentina
Blettler, Martín C. M.; Amsler, Mario L.; Ezcurra de Drago, Inés; Espinola, Luis A.; Eberle, Eliana; Paira, Aldo; Best, James L.; Parsons, Daniel R.; Drago, Edmundo E.
Mario L. Amsler
Inés Ezcurra de Drago
Luis A. Espinola
James L. Best
Professor Daniel Parsons D.Parsons@hull.ac.uk
Professor in Sedimentology/ Director, Energy and Environment Institute
Edmundo E. Drago
This study examines the morphological features, suspended sediment inputs and hydraulic conditions within a large river in association with ecological patterns before and after a tributary confluence. In order to examine these effects, the macroinvertebrate distributions from three reaches of the Paraguay and Bermejo Rivers (Paraguay-Argentina) are investigated. The Bermejo River is a tributary that supplies significant quantities of fine sediment to the Paraguay River, primarily in suspension. Two reaches were examined on the Paraguay River, upstream and downstream of the Bermejo River junction, with the third study reach located on the Bermejo River, upstream of the confluence with the Paraguay River. The results provide clear evidence that a significantly increased loading of fine sediment at a river confluence has effects on the distribution and potential movement of benthic invertebrates in the lotic environment by representing physical barriers at affected sites. These effects may be important at both local and regional scales, and such increases in suspended sediment (especially associated with anthropogenic change) may thus pose a major threat to ecosystem integrity that has been historically underestimated.
|Journal Article Type||Article|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||Blettler, M. C. M., Amsler, M. L., Ezcurra de Drago, I., Espinola, L. A., Eberle, E., Paira, A., …Drago, E. E. (2015). The impact of significant input of fine sediment on benthic fauna at tributary junctions: a case study of the Bermejo-Paraguay River confluence, Argentina. Ecohydrology, 8(2), 340-352. https://doi.org/10.1002/eco.1511|
|Keywords||Ecohydrology, Benthic invertebrates, Fine sediment load, Confluence sediment dynamics, Large river|
|Additional Information||This is the author's accepted version of an article published in: Ecohydrology, 2015, v.8 issue 2.|
You might also like
Direct evidence of a high-concentration basal layer in a submarine turbidity current
What determines the downstream evolution of turbidity currents?