Plankton Microorganisms Coinciding with Two Consecutive Mass Fish Kills in a Newly Reconstructed Lake

Oikonomou, Anthi; Katsiapi, Matina; Karayanni, Hera; Moustaka‐Gouni, Maria; Kormas, Konstantinos Ar.

doi:10.1100/2012/504135

Cited by 53 publications

(39 citation statements)

References 73 publications

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“…The lake area was fluctuating from 40 to 180 km 2 due to the very gentle land slope and the inflow-outflow balance. For this reason, a significant area of the surrounding farmland was often inundated, facing soil salin-ity problems [29,[38][39][40]. The lake was drained through an ambitious reclamation project, mainly for agricultural purposes.…”

Section: Lake Karla (Thessaly Greece)mentioning

confidence: 99%

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Trophic State Index derivation through the remote sensing of Case-2 water bodies in the Mediterranean region

Papoutsa¹,

Akylas²,

Hadjimitsis³

2014

Open Geosciences

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Abstract:The main goal of this study is the derivation of Carlson's Trophic State Index (TSI) through the remote sensing of four different Case-2 waters in the Mediterranean region such as Cyprus and Greece. TSI SD is derived through extensive field ground campaign of Secchi Disk Depth measurements for the Asprokremmos Dam, located in Paphos District in Cyprus; Alyki Salt Lake, located in Larnaca District in Cyprus; and in Karla Lake, located in Volos District in Greece; and finally to three coastal water areas in the Limassol coastal area. Several regression models have been applied in order to develop the best regression model between the TSI SD and in-band reflectance values for Landsat TM/ETM derived from spectroradiometric measurements using a GER-1500 field spectroradiometer over the main case study area in Asprokremmos Dam in Cyprus. Finally, we apply several regression models for Asprokremmos Dam for retrieving the suitable Landsat TM/ETM band or band combinations (obtained from field spectroradiometric measurements) in which TSI SD can be determined. Indeed, the best regression model has been obtained by correlating 'TSI Versus Band2/Band3', with R 2 =0.89. All field TSI SD and in-band reflectance values from the four different water bodies have been used to develop the best fitted model for the established T SI SD Versus Band2/Band3 model. We find that the exponential regression model provides the best fitted equation over the four different water bodies. Keywords

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Section: Lake Karla (Thessaly Greece)mentioning

confidence: 99%

“…Currently a project for a partial restoration of the Karla Lake is under progress. According to the current scheme, a water reservoir with a size of 3,800 Ha will be created in the lowest part of the old lake bed [29,40,41].…”

Section: Lake Karla (Thessaly Greece)mentioning

confidence: 99%

Trophic State Index derivation through the remote sensing of Case-2 water bodies in the Mediterranean region

Papoutsa¹,

Akylas²,

Hadjimitsis³

2014

Open Geosciences

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“…In any case, our OTUs matched with environmental sequences that originated mainly from marine samples. Only the GenBank sequence JN090872 had been detected in a Greek freshwater lake as well (Oikonomou et al, 2012). Our finding of several freshwater OTUs within acanthoecids demonstrates that there is also an unknown freshwater diversity of this choanoflagellate group, although the OTUs are not as abundant as in marine environments .…”

Section: Detection Of Marine Groups In Paraná Freshwater Samplesmentioning

confidence: 76%

Novel Diversity of Deeply Branching Holomycota and Unicellular Holozoans Revealed by Metabarcoding in Middle Paraná River, Argentina

et al. 2018

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Opisthokonta represents a major lineage of eukaryotes and includes fungi and metazoans, as well as other less known unicellular groups. The latter are paraphyletic assemblages that branch in between the former two groups, and thus are important for understanding the origin and early diversification of opisthokonts. The full range of their diversity, however, has not yet been explored from diverse ecological habitats. Freshwater environments are crucial sources for new diversity; they are considered even more heterogeneous than marine ecosystems. This heterogeneity implies more ecological niches where local eukaryotic communities are located. However, knowledge of the unicellular opisthokont diversity is scarce from freshwater environments. Here, we performed an 18S rDNA metabarcoding study in the Middle Paraná River, Argentina, to characterize the molecular diversity of microbial eukaryotes, in particular unicellular members of Opisthokonta. We identified a potential novel clade branching as a sister-group to Fungi. We also detected in our data that more than 60% operational taxonomic units classified as unicellular holozoans (animals and relatives) represent new taxa at the species level. Of the remaining, the majority was assigned to the newly described holozoan species, Syssomonas multiformis. Together, our results show that a large hidden diversity of unicellular members of opisthokonts still remain to be uncovered. We also found that the geographical and ecological distribution of several taxa considered exclusive to marine environments is wider than previously thought.

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“…Lake Karla is listed in the network of the Greek protected areas (it is a Natura site (GR1420004), a Ramsar site, and a Special Protected Area site for birds). It has, however, experienced adverse effects already from the first year of its refilling, as toxinproducing cyanobacterial blooms (Oikonomou et al, 2012; and fish mortalities or considerable amounts of MCs in fish species have been detected (Papadimitriou et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Monitoring a newly re-born patient: water quality and cyanotoxin occurrence in a reconstructed shallow Mediterranean lake

et al. 2017

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Lake Karla (Central Greece) is a unique example -at European scale -of a shallow lake ecosystem that was dried in the 1960s and in 2009 started to be restored. The lake is listed in the network of the Greek protected areas as it is considered a vital aquatic ecosystem, in terms of biodiversity. It has, however, already been adversely affected by both agricultural and industrial land uses in the surrounding area, leading to eutrophication and shifting algal community towards bloom-forming toxic cyanobacterial species. After repeated heavyblooms, cyanotoxin occurrence and mass fish kills, the local ecosystem management authority has implemented a water quality monitoring program (July 2013 -July 2015) to assess environmental pressures and the response of aquatic biota in the lake. Microscopic, immunological, and molecular techniques combined with physico-chemical parameters, complemented by liquid chromatography tandem mass spectrometry (LC-MS/MS), were used to monitor cyanobacteria blooms and the associated cyanotoxin production from three different sites in Lake Karla and from the adjacent Kalamaki Reservoir. Water quality was also assessed by the structure of benthic invertebrate community on the sediment. Cyanobacteria were the main phytoplankton component, representing more than 70% of the total phytoplankton abundance; dominant taxa belonged to Cylindrospermopsis raciborskii, Limnothrix redekei, Anabaenopsis elenkinii, and Microcystis spp. Euglenophytes (Euglena), diatoms (Nitzschia), and chlorophytes (Scenedesmus) were also important phytoplankton constituents. LC-MS/MS confirmed the co-occurrence of microcystins, cylindrospermopsin, saxitoxin, neo-saxitoxin and anatoxin-a. The occurrence of cyanotoxins in relation to the persistent and dominant cyanobacteria and the impact of cyanobacterial harmful algal blooms on the newly constructed lake along with the land uses and the emergent mitigation measures are discussed.

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Plankton Microorganisms Coinciding with Two Consecutive Mass Fish Kills in a Newly Reconstructed Lake

Cited by 53 publications

References 73 publications

Trophic State Index derivation through the remote sensing of Case-2 water bodies in the Mediterranean region

Trophic State Index derivation through the remote sensing of Case-2 water bodies in the Mediterranean region

Novel Diversity of Deeply Branching Holomycota and Unicellular Holozoans Revealed by Metabarcoding in Middle Paraná River, Argentina

Monitoring a newly re-born patient: water quality and cyanotoxin occurrence in a reconstructed shallow Mediterranean lake

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