Delayed nitrate dispersion within a coastal aquifer provides constraints on land-use evolution and nitrate contamination in the past

Erostate, Mélanie; Huneau, Frédéric; Garel, Émilie; Lehmann, Moritz F.; Kühn, Thomas; Aquilina, Luc; Vergnaud-Ayraud, Virginie; Labasque, Thierry; Santoni, Sébastien; Salais, Robert; Provitolo, Damienne; Pasqualini, Vanina

doi:10.1016/j.scitotenv.2018.06.375

Cited by 44 publications

(20 citation statements)

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“…Coastal lagoons have these exact characteristics. In addition, they tend to have multiple and intense freshwater influences, directly through rivers, watercourses, or surface runoff and by direct or indirect anthropic discharges, without forgetting the possible influence of groundwater, which may be especially important in many lagoons as a promoting and/or mitigating agent (Jiménez-Martínez et al, 2016;Erostate et al, 2018;Rodellas et al, 2018). All these vectors are capable of transporting nutrients derived from human activity.…”

Section: Factors Of Risk Resistance and Resilience To Eutrophicatiomentioning

confidence: 99%

Long-Term Dynamic in Nutrients, Chlorophyll a, and Water Quality Parameters in a Coastal Lagoon During a Process of Eutrophication for Decades, a Sudden Break and a Relatively Rapid Recovery

et al. 2019

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Coastal lagoons are considered among the marine habitats with the highest biological productivity, and support a great variety of human activities and pressures that make them especially vulnerable to trophic imbalances. While dystrophic crises are common in many lagoons, others like the Mar Menor show homeostatic mechanisms, high resilience, and clear waters. This paper analyses the water column descriptors dynamic during the last 22 years in this coastal lagoon, in the context of a eutrophication process produced by an increase in nutrient inputs, mainly derived from agriculture. Despite water column nitrate concentration increased by one order of magnitude, the lagoon maintained homeostatic regulation for two decades, keeping the water transparency and relatively low levels of nutrients and chlorophyll a (Prebreak phase), followed by a sudden change of state in 2016 with an abrupt increase in average nutrients and chlorophyll a concentration and loss of water transparency (Break phase), and a relatively rapid recovery after the reduction of nutrient discharges (Recovery phase). The activation of the regulation mechanisms seems to manifest through an ammonium production in the water column, as a consequence of the activity in the trophic web. The low correlation between chlorophyll a and nutrients concentration, mainly at small spatio-temporal scales, is in disagreement with eutrophication traditional models, and suggests a rapid response of primary producers to nutrient inputs and a zooplankton control in the short-term, which in turn is controlled by the rest of the trophic web components. Homeostatic properties that in the Mar Menor lagoon have provided resistance to eutrophication are based on several mechanisms: channeling its production toward the benthic system (maintaining high biomasses of primary producers, filter feeders, and detritivores), a top-down control of the pelagic trophic web exerted by ichthyoplankton and jellyfish, and exporting surplus production outside

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Section: Factors Of Risk Resistance and Resilience To Eutrophicatiomentioning

confidence: 99%

Long-Term Dynamic in Nutrients, Chlorophyll a, and Water Quality Parameters in a Coastal Lagoon During a Process of Eutrophication for Decades, a Sudden Break and a Relatively Rapid Recovery

et al. 2019

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“…This Mediterranean lagoon has been increasingly impacted since 1980 by a strong increase of the human population density, industrial and agricultural uses in its catchment and its surrounding areas. This lagoon receives particularly high amounts of nitrate from runoffs, tributaries, and from groundwater flows from a coastal aquifer connected with the lagoon (Erostate et al, 2018). Biguglia lagoon also displays a high confinement and restricted exchanges with the Tyrrhenian Sea that have induced higher levels of nutrient concentration than in most other French Mediterranean lagoons these last decades (Souchu et al, 2010;Pasqualini et al, 2017).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Biguglia lagoon was principally enriched by high nitrogen inputs, especially during the wet periods. Indeed, high nitrate inputs from a huge historical accumulation are carried to the lagoon by groundwater flows during strong episodic rainfall events (Erostate et al, 2018).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Physiological and behavioral responses of phytoplankton communities to nutrient availability in a disturbed Mediterranean coastal lagoon

Leruste

Pasqualini

Garrido

et al. 2019

Estuarine, Coastal and Shelf Science

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Short-term bioassays were conducted in Biguglia lagoon (Corsica) to study the physiological and behavioral responses of phytoplankton to N-and P-availability. Natural communities were collected in two stations representative of the two sub-basins, at three periods with contrasting environmental characteristics to address the impact of seasonal variability. These samples were separately enriched with a full N and P enrichment, and with enrichments minus N or minus P. Phytoplankton size structuration, diversity, and growth of the total phytoplankton, the micro-, nano-and ultraphytoplankton were evaluated using spectrofluorimetry, and optical microscopy. Results showed that the communities were fueled by NO3− in the wet periods (autumn and spring) and NH4+ in summer. The phytoplankton communities displayed highest cell size in autumn, with high abundances of nanoflagellates, and smallest cell size in summer with a large dominance of phycocyanin-rich picocyanobacteria. Blooms of dinoflagellates also occurred during the wet periods, coinciding with high N:P ratios. The full enrichment has not stimulated phytoplankton growth in autumn, suggesting the importance of other controlling factors such as light, a possible NH4+ inhibition or the use of mixotrophic abilities. In spring, communities have displayed single P-limitation in the northern basin and different N and P co-limitations in the southern basin. In summer, the full enrichment consistently stimulated the growth of all cell sizes. The communities showed high N and P co-limitations, which is consistent with growing observations in aquatic ecosystems, and reflects the different functional responses of phytoplankton communities to the nutrient availability. Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site.

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“…Also, Martin, Hayes, Rutledge, and Hyndman (2011) studied the influence of land-use changes on water chemistry in several watersheds of Lake Huron and found a significant effect of past land use on water composition. Other hydrological studies have also revealed a time-lag effect of water contamination in river ecosystems (Boutt, Hyndman, Pijanowski, & Long, 2001) or in groundwater aquifers (Erostate et al, 2018) and underline the need to consider this process for aquatic ecosystem conservation and restoration (Foster et al, 2003;Thompson, King, Kingsford, Nally, & Poff, 2018).…”

Section: Introductionmentioning

confidence: 99%

Influence of historical landscape on aquatic plant diversity

Jamoneau

Bouraï

Devreux

et al. 2020

J Vegetation Science

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Questions: The historical composition of landscapes is recognized as an important factor for explaining plant diversity, because species assemblages are not only patterned by current ecological conditions, but also represent legacies of the past. Contrary to terrestrial ecosystems, the influence of history has rarely been considered for aquatic communities. Here, we examined the effect of past land use on aquatic plant communities of freshwater shallow lakes. We first aimed to identify the relevant scale for studying landscape effects on macrophyte communities and then to test the relative influence of environmental variables and past and recent land use on aquatic plant assemblages. Location: Atlantic coastline, southwestern France. Methods: We surveyed shoreline macrophyte communities of 17 lakes and used species accumulation curves to estimate taxonomic richness. We used water chemistry and lakes' morphological features as environmental variables and reconstructed landuse occupancies of lakes' watershed with aerial pictures of 1945, 1965, 1985 (past) and 2002 (recent). We examined landscape change with principal component analysis and taxonomic composition with non-metrical multidimensional scaling. We then evaluated the relative influence of morphological, chemical, past and recent land-use factors on taxonomic richness and composition with variation partitioning methods. Results: We found that the studied landscapes exhibit a trend toward an increase of urban and arable fields areas at the expense of semi-natural ones. Water chemical composition and past land use of the whole watershed (particularly urban and semiurban areas) were strongly inter-correlated, and explained the major part of the variation of taxonomic richness and composition. Conclusions: These results underline the importance of historical factors in explaining aquatic plant diversity and suggest delayed responses of communities to anthropogenic pressures. Integrating historical factors in future analyses of aquatic ecosystems would thus greatly contribute to understanding ecological processes, and is crucial for the conservation and management of macrophyte communities.

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Delayed nitrate dispersion within a coastal aquifer provides constraints on land-use evolution and nitrate contamination in the past

Cited by 44 publications

References 76 publications

Long-Term Dynamic in Nutrients, Chlorophyll a, and Water Quality Parameters in a Coastal Lagoon During a Process of Eutrophication for Decades, a Sudden Break and a Relatively Rapid Recovery

Long-Term Dynamic in Nutrients, Chlorophyll a, and Water Quality Parameters in a Coastal Lagoon During a Process of Eutrophication for Decades, a Sudden Break and a Relatively Rapid Recovery

Physiological and behavioral responses of phytoplankton communities to nutrient availability in a disturbed Mediterranean coastal lagoon

Influence of historical landscape on aquatic plant diversity

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