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Spatial variability in nutrient and organic matter concentrations during hydrological fragmentation of an intermittent temperate catchment.

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Title: Spatial variability in nutrient and organic matter concentrations during hydrological fragmentation of an intermittent temperate catchment.
Authors: Casanova, Andrés1 (AUTHOR) andres.casanova@institut-agro.fr, Dupas, Rémi1 (AUTHOR) remi.dupas@inrae.fr, von Schiller, Daniel2,3 (AUTHOR) d.vonschiller@ub.edu, Jeanneau, Laurent4 (AUTHOR) laurent.jeanneau@univ-rennes.fr, Jaffrezic, Anne1 (AUTHOR) anne.jaffrezic@institut-agro.fr, Lambert, Thibault1 (AUTHOR) thibault.lambert@inrae.fr, Pannard, Alexandrine5 (AUTHOR) alexandrine.pannard@univ-rennes.fr, Fovet, Ophélie1 (AUTHOR) ophelie.fovet@inrae.fr
Source: Aquatic Sciences. Jan2026, Vol. 88 Issue 1, p1-17. 17p.
Subject Terms: *Spatial variation, *Ephemeral streams, *Biogeochemistry, *Hydrological research, *Agronomy, *Organic compounds, *Climate change
Abstract: Intermittent and ephemeral streams are watercourses that cease to flow and/or dry up during part of the year. Their seasonal drying is sometimes preceded by a stream fragmentation phase with formation of isolated pools where the biogeochemistry differs from that of perennial reaches. Our objective was to analyse how hydrological fragmentation alters the spatial variability in dissolved nutrient and organic matter concentrations in a temperate-oceanic and agriculture-impacted headwater stream, where nutrient loadings are high. We conducted repeated synoptic sampling campaigns at high spatial resolution (150–200 m) along the stream network of the Naizin catchment (7 km2) during the spring–summer-fall of 2023. We sampled 38 sites and analysed dissolved organic carbon (DOC) concentrations and fluorescence properties, dissolved inorganic nitrogen (DIN) and soluble reactive phosphorus (SRP) concentrations, during four sampling campaigns: stream recession, early and late fragmentation and reconnection. Our results showed an increase in the spatial variability of concentrations, with monotonic longitudinal gradients along the stream disappearing during hydrological fragmentation. Both DOC and SRP concentrations were higher in isolated pools than in flowing reaches, while DIN concentration was lower. The chemical composition of DIN and DOC also changed with stream fragmentation, with increasing proportions of nitrite and ammonium in DIN and humic-like organic matter in DOC. These results suggest that the main controlling processes in the isolated pools were streambed mobilisation of SRP and DOC, along with denitrification under anoxic conditions. We expect the observed spatio-temporal patterns in nutrient and DOC concentrations to become more widespread in the future as intermittent streams will become more frequent owing to climate change. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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DbLabel: Energy & Power Source
An: 189534711
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Spatial variability in nutrient and organic matter concentrations during hydrological fragmentation of an intermittent temperate catchment.
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  Data: <searchLink fieldCode="AR" term="%22Casanova%2C+Andrés%22">Casanova, Andrés</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> andres.casanova@institut-agro.fr</i><br /><searchLink fieldCode="AR" term="%22Dupas%2C+Rémi%22">Dupas, Rémi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> remi.dupas@inrae.fr</i><br /><searchLink fieldCode="AR" term="%22von+Schiller%2C+Daniel%22">von Schiller, Daniel</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<i> d.vonschiller@ub.edu</i><br /><searchLink fieldCode="AR" term="%22Jeanneau%2C+Laurent%22">Jeanneau, Laurent</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> laurent.jeanneau@univ-rennes.fr</i><br /><searchLink fieldCode="AR" term="%22Jaffrezic%2C+Anne%22">Jaffrezic, Anne</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> anne.jaffrezic@institut-agro.fr</i><br /><searchLink fieldCode="AR" term="%22Lambert%2C+Thibault%22">Lambert, Thibault</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> thibault.lambert@inrae.fr</i><br /><searchLink fieldCode="AR" term="%22Pannard%2C+Alexandrine%22">Pannard, Alexandrine</searchLink><relatesTo>5</relatesTo> (AUTHOR)<i> alexandrine.pannard@univ-rennes.fr</i><br /><searchLink fieldCode="AR" term="%22Fovet%2C+Ophélie%22">Fovet, Ophélie</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ophelie.fovet@inrae.fr</i>
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  Data: <searchLink fieldCode="JN" term="%22Aquatic+Sciences%22">Aquatic Sciences</searchLink>. Jan2026, Vol. 88 Issue 1, p1-17. 17p.
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  Data: *<searchLink fieldCode="DE" term="%22Spatial+variation%22">Spatial variation</searchLink><br />*<searchLink fieldCode="DE" term="%22Ephemeral+streams%22">Ephemeral streams</searchLink><br />*<searchLink fieldCode="DE" term="%22Biogeochemistry%22">Biogeochemistry</searchLink><br />*<searchLink fieldCode="DE" term="%22Hydrological+research%22">Hydrological research</searchLink><br />*<searchLink fieldCode="DE" term="%22Agronomy%22">Agronomy</searchLink><br />*<searchLink fieldCode="DE" term="%22Organic+compounds%22">Organic compounds</searchLink><br />*<searchLink fieldCode="DE" term="%22Climate+change%22">Climate change</searchLink>
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  Label: Abstract
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  Data: Intermittent and ephemeral streams are watercourses that cease to flow and/or dry up during part of the year. Their seasonal drying is sometimes preceded by a stream fragmentation phase with formation of isolated pools where the biogeochemistry differs from that of perennial reaches. Our objective was to analyse how hydrological fragmentation alters the spatial variability in dissolved nutrient and organic matter concentrations in a temperate-oceanic and agriculture-impacted headwater stream, where nutrient loadings are high. We conducted repeated synoptic sampling campaigns at high spatial resolution (150–200 m) along the stream network of the Naizin catchment (7 km2) during the spring–summer-fall of 2023. We sampled 38 sites and analysed dissolved organic carbon (DOC) concentrations and fluorescence properties, dissolved inorganic nitrogen (DIN) and soluble reactive phosphorus (SRP) concentrations, during four sampling campaigns: stream recession, early and late fragmentation and reconnection. Our results showed an increase in the spatial variability of concentrations, with monotonic longitudinal gradients along the stream disappearing during hydrological fragmentation. Both DOC and SRP concentrations were higher in isolated pools than in flowing reaches, while DIN concentration was lower. The chemical composition of DIN and DOC also changed with stream fragmentation, with increasing proportions of nitrite and ammonium in DIN and humic-like organic matter in DOC. These results suggest that the main controlling processes in the isolated pools were streambed mobilisation of SRP and DOC, along with denitrification under anoxic conditions. We expect the observed spatio-temporal patterns in nutrient and DOC concentrations to become more widespread in the future as intermittent streams will become more frequent owing to climate change. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1007/s00027-025-01247-2
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      – Code: eng
        Text: English
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        PageCount: 17
        StartPage: 1
    Subjects:
      – SubjectFull: Spatial variation
        Type: general
      – SubjectFull: Ephemeral streams
        Type: general
      – SubjectFull: Biogeochemistry
        Type: general
      – SubjectFull: Hydrological research
        Type: general
      – SubjectFull: Agronomy
        Type: general
      – SubjectFull: Organic compounds
        Type: general
      – SubjectFull: Climate change
        Type: general
    Titles:
      – TitleFull: Spatial variability in nutrient and organic matter concentrations during hydrological fragmentation of an intermittent temperate catchment.
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            – D: 01
              M: 01
              Text: Jan2026
              Type: published
              Y: 2026
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              Value: 88
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