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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The effect of agriculture on the seasonal dynamics and functional diversity of benthic biofilm in tropical headwater streams

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Author(s):
Taniwaki, Ricardo H. [1, 2] ; Matthaei, Christoph D. [3] ; Cardoso, Tatima K. M. [1] ; Ferraz, Silvio F. B. [1] ; Martinelli, Luiz A. [4] ; Piggott, Jeremy J. [5, 6]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Piracicaba - Brazil
[2] Univ Fed ABC, Ctr Engn Modelagem & Ciencias Sociais Aplicadas, Santo Andre - Brazil
[3] Univ Otago, Dept Zool, Dunedin - New Zealand
[4] Univ Sao Paulo, Ctr Energia Nucl Agr, Piracicaba - Brazil
[5] Univ Dublin, Sch Nat Sci, Trinity Coll Dublin, Dept Zool, Dublin 2 - Ireland
[6] Univ Dublin, Sch Nat Sci, Trinity Coll Dublin, Trinity Ctr Environm, Dublin 2 - Ireland
Total Affiliations: 6
Document type: Journal article
Source: Biotropica; v. 51, n. 1, p. 18-27, JAN 2019.
Web of Science Citations: 1
Abstract

Tropical streams are one of the most endangered ecosystems in the world due to the constant pressures from human activities. Among these activities, agriculture represents a land use that is crucial for human development but also a key driver of stream degradation and biodiversity decline in the tropics. Against this background, we investigated indirect effects of agriculture (alterations in stream flow and nutrient availability) and climate characteristics (water temperature) on benthic biofilm communities in tropical streams (Sao Paulo State, Brazil). Three first-order streams draining catchments dominated by agricultural land use (sugarcane for bioenergy production, pasture) with some remaining riparian forest were studied for 1 year. We focused on the relationships of benthic biofilm biomass, algal biomass, diatom community, and functional structure with streamflow dynamics, nitrate concentrations, and water temperature. Our results indicate that these biological responses were mainly mediated by flow and water temperature and not by resource availability in the studied headwater streams. This result could be explained by the heavy rains and elevated runoff generation in these tropical catchments under agricultural influence, which might override the known effects of nutrient enrichment on benthic biofilm communities. Considering forecast climate and land-use changes in tropical streams, our findings may suggest potential shifts in benthic biofilm communities, with functional consequences for aquatic food webs in these environments. (AU)

FAPESP's process: 14/11401-9 - Ecosystemic functions of riparian vegetation in agricultural landscapes on the primary productivity of streams
Grantee:Ricardo Hideo Taniwaki
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 12/03527-7 - Ecosystemic functions of riparian vegetation in agricultural landscapes on the primary productivity of streams
Grantee:Ricardo Hideo Taniwaki
Support Opportunities: Scholarships in Brazil - Doctorate