Jesús D. Ortiz

Jesús D. Ortiz
CEN association

Doctor of Philosophy

About

18
Publications
888
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189
Citations

Publications

Publications (18)
Article
Full-text available
Patterns regarding elemental stoichiometry in stream ecosystems remain incompletely understood. We analyzed C, N, and P contents in water, benthic macroinvertebrates and their potential food resources in two reaches located upstream and downstream of a point source input in La Tordera stream (Catalonia, NE Spain). The nutrient contents in periphyto...
Article
Full-text available
Humans have been exploiting stream ecosystems for millenniums. During the last two centuries, the demographic explosion resulted in the overexploitation of natural resources and channel alterations in rivers and streams from worldwide. A large number of human threats lead to ecosystem depletion. It was not until the end of the 20th century that pop...
Article
We examined the effect of point-source inputs from wastewater treatment plants (WWTP) on in-stream uptake of ammonium, nitrate and phosphate and compared it between two streams draining catchments with contrasting land use. The selected streams were La Tordera and Gurri (NE Spain), draining a forest- and an agriculture-dominated catchment, respecti...
Article
Humans have been exploiting stream ecosystems for millenniums. During the last two centuries, the demographic explosion resulted in the overexploitation of natural resources and channel alterations in rivers and streams from worldwide. A large number of human threats lead to ecosystem depletion. It was not until the end of the 20th century that pop...
Article
We sampled benthic macroinvertebrates above and below a point source effluent in La Tordera stream (NE, Spain) over 2001–2002 to assess the effects of nutrient enrichment on the structure, and taxonomic composition of the benthic macroinvertebrate community. Below the point source, discharge, specific conductance and nutrient concentrations were hi...
Article
We examined how community measures (density, biomass, and richness) and community composition were related to microhabitat variables (including hydraulic parameters, substrate, and food resources) in La Tordera stream in Catalonia (NE Spain). We collected macroinvertebrate samples on six dates between November 2001 and September 2002 upstream and d...
Article
Full-text available
We sampled chlorophyll a, benthic organic matter, and benthic macroinvertebrates in June 2001 in La Tordera stream (Catalonia, NE Spain), receiving a wastewater treatment plant (WWTP) input. Samples were collected in six equidistant transects in three reaches located upstream (UP), few m below (DW1), and 500m below the WWTP input (DW2). Our first o...

Projects

Project (1)
Archived project