Influence of Hydrological Regime in Determining the Response of Macroalgal Blooms to Nutrient Loading in Two Irish Estuaries

Longphuirt, Sorcha Ní; O’Boyle, Shane; Wilkes, Robert; Dabrowski, Tomasz; Stengel, Dagmar B.

doi:10.1007/s12237-015-0009-5

Cited by 20 publications

(18 citation statements)

References 31 publications

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“…Five potential quality categories are used: ‘High’, ‘Good’, ‘Moderate’, ‘Poor’, and ‘Bad’. EQR- Ecological Quality Ratio- scale from 1–0, high is 1, and bad is 0 [15]. Spatial cover- Total area covered by algae, mapped in situ.…”

Section: Resultsmentioning

confidence: 99%

“…The high nitrogen loading has been implied by the highest stocking rate of dairy farms in Ireland [46] and this has been considered the main nutrient factor for affecting the Ulva bloom [15]. Similarly, nutrient enrichment linked to pig-farming was implicated in the Ulva blooms in Brittany [48], producing over 100,000 m 3 of algae annually [24].…”

Section: Discussionmentioning

confidence: 99%

“…The Irish WFD monitoring tool based on the abundance of opportunistic macroalgae is described by Scanlan et al [16] and Ní Longphuirt et al [15]. This tool considers spatial cover, biomass and persistence of algal growth to classify water bodies relative to undisturbed conditions [16].…”

Section: Methodsmentioning

confidence: 99%

“…One of the BQE used to assess the Ecological Status (ES) in coastal and transitional water bodies is based on the composition and abundance of the marine macroalgae. The presence of ‘blooms of green opportunistic macroalgae’, mainly of the genus Ulva , have been primarily used for assessment of transitional waters in Ireland [14, 15] and other European countries [16]. The WFD assessment of opportunistic algae can also be considered when assessing the MSFD descriptor in Eutrophication (D5) in coastal waters.…”

Section: Introductionmentioning

confidence: 99%

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Assessment and Characterisation of Ireland's Green Tides (Ulva Species)

et al. 2017

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Enrichment of nutrients and metals in seawater associated with anthropogenic activities can threaten aquatic ecosystems. Consequently, nutrient and metal concentrations are parameters used to define water quality. The European Union’s Water Framework Directive (WFD) goes further than a contaminant-based approach and utilises indices to assess the Ecological Status (ES) of transitional water bodies (e.g. estuaries and lagoons). One assessment is based upon the abundance of opportunistic Ulva species, as an indication of eutrophication. The objective of this study was to characterise Ireland’s Ulva blooms through the use of WFD assessment, metal concentrations and taxonomic identity. Furthermore, the study assessed whether the ecological assessment is related to the metal composition in the Ulva. WFD algal bloom assessment revealed that the largest surveyed blooms had an estimated biomass of 2164 metric tonnes (w/w). DNA sequences identified biomass from all locations as Ulva rigida, with the exception of New Quay, which was Ulva rotundata. Some blooms contained significant amounts of As, Cu, Cr, Pb and Sn. The results showed that all metal concentrations had a negative relationship (except Se) with the Ecological Quality Ratio (EQR). However, only in the case of Mn were these differences significant (p = 0.038). Overall, the metal composition and concentrations found in Ulva were site dependent, and not clearly related to the ES. Nevertheless, sites with a moderate or poor ES had a higher variability in the metals levels than in estuaries with a high ES.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment and Characterisation of Ireland's Green Tides (Ulva Species)

et al. 2017

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“…Drought may increase retention times and thermal stratification of the water column or may increase nutrient availability through sediment resuspension due to decreased depth [10,[16][17][18]. While these factors are recognized, there is still considerable uncertainty in the temporal or spatial scales of these interactions in various types of freshwater systems [7,19], for instance the role of lag time between a rainstorm and bloom event, or the importance of a hydrologic especially in regions with greater impacts of climate change and dense populations. Due to their often shallow and nutrient-rich waters, reservoirs are at risk of eutrophication and harmful algal blooms (HABs) [1].…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Relationships of Phytoplankton Blooms, Drought, and Rainstorms in Freshwater Reservoirs

Knapp

Milewski

2020

Water

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Algal blooms, especially those composed of toxic phytoplankton, are a global threat to eutrophic and mesotrophic freshwater reservoirs. While extreme hydrologic events such as flooding and drought have been shown to control bloom onset and success, the spatiotemporal dynamics of these relationships are still unclear for mesotrophic reservoirs. In this study, the relationships between hydrologic events and phytoplankton in Lake Allatoona and Lake Lanier, Georgia, United States, were characterized using historical and satellite datasets from 2008 to 2017 and statistical modeling. Results showed that the impact of stormflow and rainstorm events varied systematically from riverine to lacustrine reaches of the two reservoirs on weekly and monthly scales. Precipitation duration and stormflow were the most significant and best-fitting predictors of algal bloom biomass in deeper reaches of the two reservoirs, suggesting that algal blooms in more lacustrine environments may be better equipped for wet and stormy regimes than has been previously hypothesized.

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Mud-entrained macroalgae utilise porewater and overlying water column nutrients to grow in a eutrophic intertidal estuary

Robertson

Savage

2018

Biogeochemistry

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Influence of Hydrological Regime in Determining the Response of Macroalgal Blooms to Nutrient Loading in Two Irish Estuaries

Cited by 20 publications

References 31 publications

Assessment and Characterisation of Ireland's Green Tides (Ulva Species)

Assessment and Characterisation of Ireland's Green Tides (Ulva Species)

Spatiotemporal Relationships of Phytoplankton Blooms, Drought, and Rainstorms in Freshwater Reservoirs

Mud-entrained macroalgae utilise porewater and overlying water column nutrients to grow in a eutrophic intertidal estuary

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