The North Atlantic Oscillation and the Arctic Oscillation favour harmful algal blooms in SW Europe

Báez, José C.; Real, Raimundo; López‐Rodas, Victoria; Costas, Eduardo; Tierra, Ángel Enrique Salvo; García-Soto, Carlos; Flores‐Moya, Antonio

doi:10.1016/j.hal.2014.07.008

Cited by 19 publications

(14 citation statements)

References 55 publications

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“…(a) an area (bluish colours in Figure 8) fed by tributaries, both canalized and natural (Caño Travieso, Caño Guadiamar, Arroyo de la Rocina see Figure 1), pumping stations (Lucio de la FAO, label 2 in Figure 7a), groundwater seepages (Lucio del Hondón and Vera Sur labelled as 1 in Figure 8) or brackish waters from Guadalquivir River; and (b) a region (reddish colours in Figure 8) strictly fed by rainfall and eventually drained under management decisions for the avoidance of harmful algal blooms [73]. The calculated Theil-Sen slope for hydroperiod reveals a consistent and significant increase on hydroperiod in the north-western area of the marsh and a relevant decrease in the South and the centre of the marshes (Figure 8).…”

Section: Hydroperiod Historical Trend and Anomaliesmentioning

confidence: 99%

Long-Term Monitoring of the Flooding Regime and Hydroperiod of Doñana Marshes with Landsat Time Series (1974–2014)

et al. 2016

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This paper presents a semi-automatic procedure to discriminate seasonally flooded areas in the shallow temporary marshes of Doñana National Park (SW Spain) by using a radiommetrically normalized long time series of Landsat MSS, TM, and ETM+ images . Extensive field campaigns for ground truth data retrieval were carried out simultaneous to Landsat overpasses. Ground truth was used as training and testing areas to check the performance of the method. Simple thresholds on TM and ETM band 5 (1.55-1.75 µm) worked significantly better than other empirical modeling techniques and supervised classification methods to delineate flooded areas at Doñana marshes. A classification tree was applied to band 5 reflectance values to classify flooded versus non-flooded pixels for every scene. Inter-scene cross-validation identified the most accurate threshold on band 5 reflectance ( < 0.186) to classify flooded areas (Kappa = 0.65). A joint TM-MSS acquisition was used to find the MSS band 4 (0.8 a 1.1 µm) threshold. The TM flooded area was identical to the results from MSS 4 band threshold < 0.10 despite spectral and spatial resolution differences. Band slicing was retrospectively applied to the complete time series of MSS and TM images. About 391 flood masks were used to reconstruct historical spatial and temporal patterns of Doñana marshes flooding, including hydroperiod. Hydroperiod historical trends were used as a baseline to understand Doñana's flooding regime, test hydrodynamic models, and give an assessment of relevant management and restoration decisions. The historical trends in the hydroperiod of Doñana marshes show two opposite spatial patterns. While the north-western part of the marsh is increasing its hydroperiod, the southwestern part shows a steady decline. Anomalies in each flooding cycle allowed us to assess recent management decisions and monitor their hydrological effects.

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Section: Hydroperiod Historical Trend and Anomaliesmentioning

confidence: 99%

Long-Term Monitoring of the Flooding Regime and Hydroperiod of Doñana Marshes with Landsat Time Series (1974–2014)

et al. 2016

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“…Cyanobacteria dominate the phytoplankton under warm eutrophic conditions in lakes at tropical (Sotero‐Santos et al., ; Wilhelm et al., ; Zhu et al., ) and temperate latitudes (Báez et al., ; Paerl & Huisman, ). Warming may result in greater phosphorus release from lake sediments (Wilhelm & Adrian, ) and changes in the efficiency of nutrient retention within food webs (Huber, Adrian, & Gerten, ), leading to eutrophication and the occurrence of noxious phytoplankton blooms (Gkelis & Zaoutsos, ).…”

Section: Introductionmentioning

confidence: 99%

Increased risk of cyanobacterial blooms in northern high‐latitude lakes through climate warming and phosphorus enrichment

2017

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Harmful cyanobacterial blooms are an increasing problem at many locations throughout the world but are rarely reported in aquatic habitats at high latitudes. Shallow lakes are a major feature of northern permafrost landscapes and are likely to experience large‐scale changes in their limnological properties in the future as a consequence of climate warming. In the present study, we addressed the question of what preconditions would be necessary to stimulate the growth and dominance of bloom‐forming cyanobacteria in northern fresh waters. We analysed the summer phytoplankton of 18 lakes on eroding permafrost (thaw lakes) and on glacier‐scoured rock (rock basin lakes) in subarctic Quebec, Canada, to determine their phytoplankton community structure and the biomass contribution of cyanobacteria. This survey was complemented with an incubation experiment to evaluate the direct warming and indirect phosphorus (P) enrichment effects of climate change on cyanobacterial bloom development. All lakes contained diverse phytoplankton communities, often dominated by chrysophytes, dinoflagellates and chlorophytes. Cyanobacteria were present in all waterbodies, but their contribution to the total community biovolume was highly variable (mean of 8.7%, range 0.1%–47%). Cyanobacterial community biovolumes correlated positively with surface water temperatures, and negatively with dissolved organic carbon, soluble reactive phosphorus, iron and manganese concentrations in the surface waters. Phosphorus enrichment of water from a thaw lake resulted in a fourfold increase of chlorophyll a (Chl‐a) and an increase in the cyanobacterial pigments echinenone and zeaxanthin. The phytoplankton counts showed that there was a sharp decrease in diversity (expressed as decline of the Shannon–Wiener index from 1.69 to 0.16), accompanied by a shift to cyanobacterial dominance, notably by the heterocystous, potentially toxic species Dolichospermum cf. planctonicum. Increased temperature led to an initial doubling of cyanobacterial biovolume, followed by the development of a chrysophyte bloom. Combined warming and P enrichment led to reduced phytoplankton biodiversity, with a community composed of cyanobacteria and chrysophytes. There was also a pronounced response by the picophytoplankton community; picocyanobacteria were strongly stimulated by P enrichment, while picoeukaryotes increased in response to warming. The current inoculum levels of cyanobacteria in subarctic lakes and their responsiveness to temperature and phosphorus indicate the potential for an abrupt increase in their abundance, accompanied by a decrease in phytoplankton diversity. Ongoing climate change will increase the risk of noxious cyanobacterial blooms in northern lakes and ponds, with potentially negative consequences for higher trophic levels.

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“…global warming, inter‐annual temperature changes) and associated climatic oscillations [e.g. North Atlantic Oscillation, Arctic Oscillation (Báez et al ., )] affect the phytoplankton community structure as well. Increases in temperature with lengthened stratification periods and increased nutrient inputs have led the scientific community to forecast increased dominance of harmful cyanobacteria (e.g.…”

Section: Introductionmentioning

confidence: 99%

Microbial players involved in the decline of filamentous and colonial cyanobacterial blooms with a focus on fungal parasitism

Gerphagnon

Macarthur

Latour

et al. 2015

Environmental Microbiology

111

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SummaryIn the forthcoming decades, it is widely believed that the dominance of colonial and filamentous bloomforming cyanobacteria (e.g. Microcystis, Planktothrix, Anabaena and Cylindrospermopsis) will increase in freshwater systems as a combined result of anthropogenic nutrient input into freshwater bodies and climate change. While the physicochemical parameters controlling bloom dynamics are well known, the role of biotic factors remains comparatively poorly studied. Morphology and toxicity oftenbut not always -limit the availability of cyanobacteria to filter feeding zooplankton (e.g. cladocerans). Filamentous and colonial cyanobacteria are widely regarded as trophic dead-ends mostly inedible for zooplankton, but substantial evidence shows that some grazers (e.g. copepods) can bypass this size constraint by breaking down filaments, making the bloom biomass available to other zooplankton species. A wide range of algicidal bacteria (mostly from the Alcaligenes, Flavobacterium/Cytophaga group and Pseudomonas) and viruses (Podoviridae, Siphoviridae and Myoviridae) may also contribute to bloom control, via their lytic activity underpinned by a diverse array of mechanisms. Fungal parasitism by the Chytridiomycota remains the least studied. While each of these biotic factors has traditionally been studied in isolation, emerging research consistently point to complex interwoven interactions between biotic and environmental factors.

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The North Atlantic Oscillation and the Arctic Oscillation favour harmful algal blooms in SW Europe

Cited by 19 publications

References 55 publications

Long-Term Monitoring of the Flooding Regime and Hydroperiod of Doñana Marshes with Landsat Time Series (1974–2014)

Long-Term Monitoring of the Flooding Regime and Hydroperiod of Doñana Marshes with Landsat Time Series (1974–2014)

Increased risk of cyanobacterial blooms in northern high‐latitude lakes through climate warming and phosphorus enrichment

Microbial players involved in the decline of filamentous and colonial cyanobacterial blooms with a focus on fungal parasitism

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