Haptophytes of the Nervión River estuary, northern Spain

Seoane, Sergio; Eikrem, Wenche; Arluzea, Jon; Orive, Emma

doi:10.1515/bot.2009.027

Cited by 13 publications

(5 citation statements)

References 54 publications

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“…According to [46] comparison growth is highest around moderate salinities 20-25 PSU, and this species survived all salinities from 5 to 40 PSU. The best growth rate, dry weight, and production per dry weight values were found at 40 PSU similar to the results found with high salinities by [11,13,18,21,46]. The high salinity is a characteristic of the Red Sea about 35 to 40.5 PSU [47], thus, explaining the growth at such high salinity.…”

Section: Light Intensitysupporting

confidence: 80%

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Effect of Environmental Factors on Chrysochromulina Growth; the Most Common Cause of Fish Mortality in Jeddah

Ashour¹,

Sayegh²

2021

Pharmacophore

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A phytoplankton bloom, dominated by the prymnesiophyte Chrysochromulina sp., developed in two areas of the red sea coast, Al-Nawras and Al-Arbaeen lagoons (Jeddah, Saudi Arabia) in the fall of October and December 2016. Chrysochromulina sp. dominated at total cell densities of average 3 × 10 6 cells.ml -1 , and have caused variable degrees of mortality in fish. Fish gills were examined under a microscope and showed the presence of Chrysochromulina sp cells. This study was conducted to investigate environmental factors that affect the growth characters as a function of different salinity, pH, temperature, and light-regime (light duration and intensity). Light-regime showed the highest effect among all the factors tested, at 10:14h L:D for the light duration with a growth rate of (0.352 μ.d -1 ), dry weight of (1552.601 ng), production per dry weight of (542.613 ng.d -1 ), and chlorophyll-a content (0.221µg.ml -1 ), as for light intensity, the best results were at around 60 to 70 µmol with a growth rate of (0.426 μ.d -1 ), dry weight of (2213.086 ng), production per dry weight of (929.419 ng.d -1 ), and chlorophyll-a content of (0.205 µg.ml -1 ). Other factors were best at 15°C, 40 PSU, and 7 to 8 for the temperature, salinity, and pH, respectively. No acute toxicity was present. Therefore, the fish mortality was most likely related to the morphological aspect of the isolated species by clogging of fish gills accompanied with suitable environmental conditions, grazing and a very low dissolved oxygen level in both lagoons.

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Section: Light Intensitysupporting

confidence: 80%

“…grew well over a wide temperature range. Blooms have been recorded from 10°C [14] to 24°C [21], and this species tolerated temperatures from 10°C to 35°C. The best growth rate value was found at 15°C, which is similar to many studies that used the same temperature for a close to optimum growth [11,13,18,20,45,46].…”

Section: Light Intensitymentioning

confidence: 97%

Effect of Environmental Factors on Chrysochromulina Growth; the Most Common Cause of Fish Mortality in Jeddah

Ashour¹,

Sayegh²

2021

Pharmacophore

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“…Microbial communities from these 3 samples include higher proportions of freshwater taxa (Haptoria, Scuticociliata, Prostomatea, Choreotrichia, Sphaero pleales, Chrysophyceae-clade C; Fig. 5), whereas summer and winter libraries from the 3 southernmost stations, as well as Long Point November library are mostly represented by typically marine (Bathycoccaceae, Pycnococcaceae, Chry so phy ceae clade F, MAST) and estuarine (Oxyrrhis, Diacronema and Isochrysis) taxa as well as known halophilic genera (Fabrea, Dunaliella) (Pandey & Yeragi 2004, Seoane et al 2009, Bendif et al 2011, Guiry & Guiry 2014). These differences are also evident from a trophic point of view, whereby diatoms are the most representative photosynthetic eukaryotes at Murray Mouth during both seasons and at Long Point in June, whereas key marine picoplankters from the families Bathycoccaceae and Pycnococcaceae dominated reads from photosynthetic taxa at the other stations.…”

Section: Small Eukaryotes: Community Clustering and Shared Lineagesmentioning

confidence: 99%

Protist diversity along a salinity gradient in a coastal lagoon

Balzano¹,

Abs²,

Leterme³

2015

Aquat. Microb. Ecol.

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The importance of microbial eukaryotes to aquatic systems has been widely acknowledged in the last decade, and the application of high-throughput sequencing techniques has revealed an astonishing diversity and high proportions of novel taxa. Most studies have focused either on marine or freshwater ecosystems; thus, information on estuarine communities is either incomplete or missing. We assessed the composition of microbial eukaryotes along a South Australian coastal lagoon affected by a broad (7 to 65 PSU) salinity gradient, the Coorong Lagoon. This lagoon extends for over 170 km from the mouth of the River Murray (Murray Mouth) southwards, where the salinity increases up to hypersaline values. We sampled 5 stations during the austral summer and winter and sequenced the amplified V4 region of the 18S rRNA gene using Ion Torrent. Genetic libraries were mostly represented by reads from 5 phyla, with Chlorophyta prevailing in summer, diatoms in winter and Haptophyta in the southernmost sampling sites. In spite of the broad spatial and temporal salinity changes observed, the communities of small eukaryotes clustered in 2 groups reflecting the sample location. Moreover, dissimilarities between samples were unaffected by differences in salinity, but increased with increasing geographic distances. Microbial exchanges from the Coorong Lagoon towards both freshwater and seawater occur via the Murray Mouth and are likely to prevent the formation of communities adapted to local salinity conditions. However, such exchanges likely decrease with increasing distances from the Murray Mouth, resulting in distance-driven eukaryotic communities.KEY WORDS: Microbial eukaryotes · V4 · 18S rRNA · Geographic distance · Weighted UniFrac · QIIME Resale or republication not permitted without written consent of the publisher

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“…The inverted light-microscope technique based upon fixed samples used in this monitoring programme for phytoplankton identification and counting does not usually allow species or even genus-level identification, of small naked flagellates such us Prymnesium spp. The species level identification of prymnesiophyceans requires the analysis of the body scales through electron microscopy (Seoane et al 2009) or molecular methods.…”

Section: Discussionmentioning

confidence: 99%

“…In order to obtain unialgal cultures, serial dilution cultures were made from the field sample. Taxonomic identification was performed through cellular scale characterization, using transmission electron microscopy (Seoane et al 2009). …”

Section: Strains Originmentioning

confidence: 99%

Evaluation of marine phytoplankton toxicity by application of marine invertebrate bioassays

et al. 2014

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Summary:The dinoflagellate Alexandrium minutum and the haptophyte Prymnesium parvum are well known for their toxin production and negative effects in marine coastal environments. A. minutum produces toxins which cause paralytic shellfish poisoning in humans and can affect copepods, shellfish and other marine organisms. Toxins of P. parvum are associated with massive fish mortalities resulting in negative impacts on the marine ecosystem and large economic losses in commercial aquaculture. The aim of this work is to improve our knowledge about the reliability of the use of marine invertebrate bioassays to detect microalgae toxicity, by performing: (i) a 24-to 48-h test with the brine shrimp Artemia franciscana; (ii) a 48-hour embryo-larval toxicity test with the sea urchin Paracentrotus lividus; and (iii) a 72-h test with the amphipod Corophium multisetosum. The results indicate that A. franciscana and P. lividus larvae are sensitive to the toxicity of A. minutum and P. parvum. LC 50 comparison analysis between the tested organisms reveals that A. franciscana is the most sensitive organism for A. minutum. These findings suggest that the use of different organizational biological level bioassays appears to be a suitable tool for A. minutum and P. parvum toxicity assessment.Keywords: Alexandrium minutum; Prymnesium parvum; Paracentrotus lividus; Artemia franciscana; Corophium multisetosum; toxicity bioassays. Evaluación de la toxicidad de fitoplancton marino mediante la aplicación de bioensayos con invertebrados marinosResumen: Las microalgas Alexandrium minutum y Prymnesium parvum son bien conocidas por la producción de toxinas y sus efectos negativos en nuestras costas. A. minutum produce la toxina PSP (Paralytic Shellfish Poisoning) que afecta a humanos y una gran variedad de organismos marinos como copépodos y marisco. Las toxinas de P. parvum producen grandes mortalidades de peces ocasionando graves impactos negativos en el ecosistema marino e importantes pérdidas económicas en acuicultura. Este trabajo tiene como objetivo mejorar el conocimiento del uso de bioensayos con invertebrados marinos en la detección de la toxicidad de microalgas, mediante: (i) un test de 24-48 horas con Artemia franciscana; (ii) un test de 48 horas con embriones y larvas del erizo de mar Paracentrotus lividus; y (iii) un test de 72 horas con el anfípodo Corophium multisetosum. Los resultados muestran que las larvas de A. franciscana y P. lividus son sensibles a la toxicidad de A. minutum y P. parvum. Los análisis LC 50 revelan que A. franciscana es el organismo más sensible a A. minutum. Estos resultados indican que los bioensayos con diferentes niveles de organización biológica parecen ser una herramienta apropiada para la evaluación de la toxicidad de A. minutum y P. parvum.

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Haptophytes of the Nervión River estuary, northern Spain

Cited by 13 publications

References 54 publications

Effect of Environmental Factors on Chrysochromulina Growth; the Most Common Cause of Fish Mortality in Jeddah

Effect of Environmental Factors on Chrysochromulina Growth; the Most Common Cause of Fish Mortality in Jeddah

Protist diversity along a salinity gradient in a coastal lagoon

Evaluation of marine phytoplankton toxicity by application of marine invertebrate bioassays

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