A Comparison of Abundance and Diversity of Epiphytic Microalgal Assemblages on the Leaves of the Seagrasses<i>Posidonia oceanica</i>(L.) and<i>Cymodocea nodosa</i>(Ucria) Asch in Eastern Tunisia

Mabrouk, Lotfi; Hamza, Asma; Mahfoudhi, Mabrouka; Bradai, Med Najmeddine

doi:10.1155/2014/275305

Cited by 19 publications

(19 citation statements)

References 48 publications

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“…Nevertheless, more research on toxic strains is needed, particularly in the Southern Mediterranean basin. Reports about the occurrence of these species along the southern coasts are limited to Tunisia [66,67,68,69,70,71,72,73], Egypt [74,75] and Algeria [76]. These studies were based only on fixed field samples.…”

Section: Introductionmentioning

confidence: 99%

Toxicity and Growth Assessments of Three Thermophilic Benthic Dinoflagellates (Ostreopsis cf. ovata, Prorocentrum lima and Coolia monotis) Developing in the Southern Mediterranean Basin

Ben-Gharbia

Yahia

Amzil

et al. 2016

Toxins

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Harmful benthic dinoflagellates, usually developing in tropical areas, are expanding to temperate ecosystems facing water warming. Reports on harmful benthic species are particularly scarce in the Southern Mediterranean Sea. For the first time, three thermophilic benthic dinoflagellates (Ostreopsis cf. ovata, Prorocentrum lima and Coolia monotis) were isolated from Bizerte Bay (Tunisia, Mediterranean) and monoclonal cultures established. The ribotyping confirmed the morphological identification of the three species. Maximum growth rates were 0.59 ± 0.08 d−1 for O. cf. ovata, 0.35 ± 0.01 d−1 for C. monotis and 0.33 ± 0.04 d−1 for P. lima. Toxin analyses revealed the presence of ovatoxin-a and ovatoxin-b in O. cf. ovata cells. Okadaic acid and dinophysistoxin-1 were detected in P. lima cultures. For C. monotis, a chromatographic peak at 5.6 min with a mass m/z = 1061.768 was observed, but did not correspond to a mono-sulfated analogue of the yessotoxin. A comparison of the toxicity and growth characteristics of these dinoflagellates, distributed worldwide, is proposed.

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Section: Introductionmentioning

confidence: 99%

Toxicity and Growth Assessments of Three Thermophilic Benthic Dinoflagellates (Ostreopsis cf. ovata, Prorocentrum lima and Coolia monotis) Developing in the Southern Mediterranean Basin

Ben-Gharbia

Yahia

Amzil

et al. 2016

Toxins

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“…7). The classical shape of C. nodosa leaf apex (obtuse apex with serrated margin) are regularly observed in open sea, as well as in lagoon, along Tunisian coastlines [34][35] but Skanes site is the only site exhibiting non-classical shape. This first location could correspond to an introduction of an alien species due to its limited spatial distribution (new arrival) and the arrival, in the Mediterranean Sea, of another seagrass species (H. stipulacea) following the opening of Suez Canal [36].…”

Section: Discussionmentioning

confidence: 99%

Morphology and Genetic Studies of Cymodocea Seagrass Genus in Tunisian Coasts

Bchir¹,

Djellouli²,

Zitouna³

et al. 2019

Phyton

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Specimens of Cymodocea (Viridiplantae, Magnoliophyta) collected on the Tunisian coasts showed a particular morphological and anatomical difference with the classical descriptions of Cymodocea nodosa (Ucria) Asch. the only species of this genus reported in the Mediterranean Sea. In order to precise the taxonomic identity of the new specimens we aimed in this work (i) to verify the identity of the new forms, (ii) to evaluate the genetic diversity of the population, (iii) to test the validity of the existing identification keys of the Tunisian Cymodocea populations. Four stations located in two regions of the Tunisian coasts were sampled. Leaf morphological and anatomical characters used in taxonomic identification were measured (e.g., number of cross veins, shape of the apex). The genetic study was performed using three most common chloroplast markers for plant characterization (DNA barcodes rbcL, matK and trnHpsbA). The morphological study revealed the presence of three C. nodosa morphotypes, described here for the first time, while the molecular characterization did not allow the discrimination of these morphological types. In regard to these results, it would be wise to review the classical identification keys of the Cymodocea genus.

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“…4). Navicula is a late colonizing genus that often dominates the diatom communities on Z. marina leaves (Chung and Lee 2008), and other seagrass species such as Enhalus acoroides (Yap-Dejeto and Baqueros 2015), Posidonia oceanica, and Cymodocea nodosa (Mabrouk et al 2014). Diatomea ME.Euk.FW10 has been found in high abundance in sporophytes of Mastocarpus spp.…”

Section: Core Microeukaryotes On Seagrass Are Not Hostspecificmentioning

confidence: 99%

Microeukaryotic Communities Associated With the Seagrass Zostera marina Are Spatially Structured

Segóvia

Sanders‐Smith

Adamczyk

et al. 2020

J Eukaryotic Microbiology

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Epibiotic microorganisms link seagrass productivity to higher trophic levels, but little is known about the processes structuring these communities, and which taxa consistently associate with seagrass. We investigated epibiotic microeukaryotes on seagrass (Zostera marina) leaves, substrates, and planktonic microeukaryotes in ten meadows in the Northeast Pacific. Seagrass epibiotic communities are distinct from planktonic and substrate communities. We found sixteen core microeukaryotes, including dinoflagellates, diatoms, and saprotrophic stramenopiles. Some likely use seagrass leaves as a substrate, others for grazing, or they may be saprotrophic organisms involved in seagrass decomposition or parasites; their relatives have been previously reported from marine sediments and in association with other hosts such as seaweeds. Core microeukaryotes were spatially structured, and none were ubiquitous across meadows. Seagrass epibiota were more spatially structured than planktonic communities, mostly due to spatial distance and changes in abiotic conditions across space. Seawater communities were relatively more similar in composition across sites and more influenced by the environmental component, but more variable over time. Core and transient taxa were both mostly structured by spatial distance and the abiotic environment, with little effect of host attributes, further indicating that those core taxa would not show a strong specific association with Z. marina.

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A Comparison of Abundance and Diversity of Epiphytic Microalgal Assemblages on the Leaves of the SeagrassesPosidonia oceanica(L.) andCymodocea nodosa(Ucria) Asch in Eastern Tunisia

Cited by 19 publications

References 48 publications

Toxicity and Growth Assessments of Three Thermophilic Benthic Dinoflagellates (Ostreopsis cf. ovata, Prorocentrum lima and Coolia monotis) Developing in the Southern Mediterranean Basin

Toxicity and Growth Assessments of Three Thermophilic Benthic Dinoflagellates (Ostreopsis cf. ovata, Prorocentrum lima and Coolia monotis) Developing in the Southern Mediterranean Basin

Morphology and Genetic Studies of Cymodocea Seagrass Genus in Tunisian Coasts

Microeukaryotic Communities Associated With the Seagrass Zostera marina Are Spatially Structured

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