ABSTRACT:

Climate warming is causing more extreme weather conditions, with both larger and more intense precipitation events as well as extended periods of drought in many regions of the world. The consequence is an alteration of the hydrological regime of streams and rivers, with an increase in the probability of extreme hydrological conditions. Mediterranean-climate regions usually experience extreme hydrological events on a seasonal basis and thus, freshwater Mediterranean ecosystems can be used as natural laboratories for better understanding how climate warming will impact ecosystem structure and functioning elsewhere. In this study, we revisited and contextualized historical and new datasets collected at Fuirosos, a well-studied Mediterranean intermittent stream naturally experiencing extreme hydrological events, to illustrate how the seasonal alternation of floods and droughts influence hydrology, microbial assemblages, water chemistry, and the potential for biogeochemical processing.
The Hydroshare files contain the data and R code to reproduce the figures shown in this paper, entitled "Expanding towards contraction: the alternation of flood and droughts as fundamental component in river ecology".

ABSTRACT:

In this study, we quantify the contribution of metabolic activity to CO2 emission in two headwater streams to shed new light on the role of inland waters in global carbon cycling. To do so, we partion CO2 emission between stream metabolism and lateral inputs, and compare these fluxes between two streams differing in the strength of groundwater inputs. The two streams were permanently flowing during the study period, but one was a perennial gaining stream, and the other was a non-perennial stream with seasonally and spatially varying losing reaches. Our main finding is that net ecosystem production contributes substantially to CO2 emission at the two sites. Our paper discusses the mechanims involved and the role of hydrological and environmental conditions on determining the contribution of stream metabolic activity to CO2 emissions in these headwater streams.
The provided data set includes subdaily stream water temperature, and concentrations and fluxes of CO2 and O2 at the two streams during the deployment period. We provide daily stream discharge and light inputs as well as all the daily values needed to reproduce figures, tables, and statistics included in the manuscript.
Finally, we provided the input data needed to run streamMetabolizer and estimate daily GPP, ER, and K600. Details on the procedures followed and model specifications canbe found in the Supplementary Materials of the paper.

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ABSTRACT:

This dataset presents daily time series of dissolved organic carbon (DOC) and nitrate (NO3-) concentrations at three locations along the Font del Regàs stream for the period September 2010 to August 2012. The sub-humid, Mediterranean Font del Regàs catchment is located in northeastern Spain (total drainage area = 15.5 km2).

ABSTRACT:

This dataset presents 10-min resolution time series of stream water (Sw) and near-stream groundwater (Gw) levels for the period September 2018 to March 2020 at two Mediterranean catchments located in northeastern Spain: the sub-humid Font del Regàs (total drainage area = 15.5 km2, drainage area of the measurement location = 14.2 km2), and the semi-arid Fuirosos (total drainage area = 16.5 km2, drainage area of the measurement location = 9.9 km2).

ABSTRACT:

This dataset presents daily precipitation, temperature, stream flow, and riparian groundwater table time series for the period September 2010 to August 2012 at the sub-humid, Mediterranean Font del Regàs catchment, located in northeastern Spain (total drainage area = 15.5 km2). The dataset also includes biweekly measurements of groundwater tables at seven extra locations within a confined riparian area, and chemical data characterizing a riparian soil profile.