The Kızılırmak River is the longest river (1.355 km) in Turkey and flows into the Black Sea. Main pressures in the basin are waste water discharges, widespread agriculture, livestock activities, and ...excessive salinity due to the natural formation. In this study, the performance of the most widely used European diatom indices (IPS, IDG, IBD, EPI-D, TDI, and TI) was tested statistically by comparing them with the indicators of organic pollution (biological oxygen demand and ammonium-nitrogen), eutrophication (orthophosphate and nitrate-nitrogen) and salinization (electrical conductivity) in the Kızılırmak basin, Turkey. For this purpose, a total of 97 diatom samples from 33 rivers were collected seasonally in 2014 and 215 species were identified. Principal component analysis was performed to evaluate the “general degradation” in the basin, and linear regression was used to calculate the correlations with diatom indices. As a result, EPI-D, IPS, IBD, and TI were strongly correlated indices, respectively, while IDG and TDI had the lowest correlations with general degradation. Only the EPI-D index was significantly correlated with all environmental variables. Our results showed that the EPI-D index can be used for the ecological status assessment in terms of phytobenthos in the Kızılırmak basin in line with the Water Framework Directive.
The genus Nupela Vyverman & Compère comprises 81 species, which have been reported from different continents. This study presents the morphological characteristics of Nupela brevistriata sp. nov. ...found in moss samples collected from soil and tree bark in Southeast Asia, on the islands of Palambak and Sumatra. Light and scanning electron microscope observations are presented and a formal description is offered for the new species. Nupela brevistriata sp. nov. is characterized by the valves having very short striae, capitate apices and a large central and axial area; it occurred rarely (<2%) in assemblages dominated by typically terrestrial species, such as members of Ferocia Van de Vijver & Houk, Angusticopula Houk, Klee & H. Tanaka, Luticola D.G. Mann, Humidophila Lowe et al. and Hantzschia Grunow.
In this study, a total of 53 taxa were identified from 13 catchments in Turkey.
var.
E.Reichardt,
E.Reichardt & Lange-Bertalot,
Lange-Bertalot & E.Reichardt,
E.Reichardt & Lange-Bertalot,
(Grunow) ...Lange-Bertalot & E.Reichardt,
E.Reichardt,
var.
Levkov, Mitic-Kopanja & E.Reichardt,
Levkov,
D.A.Chudaev, Kociolek & M.A.Golobova,
Krasske,
f.
Lange-Bertalot & Reichardt,
Levkov, Mitic-Kopanja & E.Reichardt,
W.Gregory,
(Grunow) E.Reichardt & Levkov and
(Foged) Lange-Bertalot were recorded for the first time in Turkey. Of the identified taxa,
(Lyngbye) M.Schmidt,
Ehrenberg,
Kützing,
(Kützing) Rabenhorst,
Ehrenberg,
Kützing,
(C.Agardh) C.Agardh,
(Hornemann) Brébisson,
(Kützing) Kützing and
Ehrenberg are common in the waters.
E.Reichardt,
Reichardt,
W.Gregory,
Kützing,
E.Reichardt,
var.
E.Reichardt & Lange-Bertalot,
E.Reichardt,
E.Reichardt and
Ehrenberg have been recently recorded from the Turkish waters. The genus
in Turkey has so far been represented only by
(M.Schmidt) Lange-Bertalot.
The Sakarya River basin is one of the largest basins in Turkey, and encompasses the Kocaeli, Düzce, Sakarya, Bursa, Bilecik, Bolu, Kütahya, Eskişehir, Ankara, Afyon, and Konya provinces. In this ...study, the water quality status of the basin was investigated using 18 diatom indices, calculated in Omnidia software. For this purpose, a total of 46 stations were surveyed in the rivers and streams of the basin in May 2018. As a result, 41 of 195 diatom taxa were found to be the most frequent (>10% share in assemblage). According to Detrented Correspondence Analysis (DCA), three subgroups were described as the spring section, Ankara and Polatlı section, and lowland section. The river basin quality was evaluated as moderate or lower quality status, while only a few sites had good status. The diatom index scores showed that the Descy’s Index (DES), Pampean Diatom Index (IDP), Artois-Picardie Diatom Index (IDAP), and Specific Pollution Sensitivity Index (IPS) appear best suited to water quality assessment in this area, showing the largest number of significantly important correlation with environmental variables.
The Aegean Sea coast of Turkey hosts one of the most important nesting grounds for loggerhead sea turtles (
) in the Mediterranean Sea. Previous studies have revealed that the sea turtle carapace ...provides favourable conditions for various epibiontic organisms. Epibionts occurring on the carapace have been examined from different locations in the oceans.
This is the first time such a high number (39) of samples collected from nesting turtles during such a long time period (extending from 2011 to 2018) has been used for the study of the diatom component of the microbiome on the turtle carapaces. A total of 33 samples were investigated in terms of light microscopy (LM) and scanning electron microscopy (SEM). Six unprocessed biofilm fragments were subject to SEM observations.
A total of 457 epizoic diatom taxa belonging to 86 genera were identified. Epizoic forms, e.g.,
spp.,
spp. or
spp. (also identified by SEM observations of the undisturbed pieces of the microbiome) dominated in terms of relative abundance, but the highest numbers of taxa were ubiquitously represented by
(79),
(45),
(40),
(32),
(25) and
(23).
and
were the most frequent taxa, present in 65% of the samples, both with an average relative abundance of 10%. The results of our study revealed that diatoms are an essential component of the loggerhead sea turtles' microbiome, in terms of high biodiversity and abundance. Although strict epibionts provide a signature of the turtle microbiome, the carapace as a solid substrate attracts numerous benthic diatom species which are considered opportunistic forms and can be found in the surrounding benthic habitats of the vast ocean littoral space.
Objective: In this study carried out in Büyükçekmece Reservoir, the composition, distribution, seasonal changes of epiphytic
diatoms that live on the surfaces of plants, and the effects of ...environmental parameters on these organisms were investigated,
and it was aimed to reveal the water quality of the reservoir.
Materials and Methods: In order to determine the seasonal changes of epiphytic diatom species in Büyükçekmece Reservoir,
water and material samples were collected from five stations in 2019. In the study, water temperature, salinity, conductivity,
dissolved oxygen, and pH values, which are among the basic ecological variables, were measured. Epiphytic diatom samples
were obtained from Phragmites sp. species. Also, Spearman's rank correlation, Shannon–Weaver diversity index, Cluster
(Bray–Curtis and Euclidean Distance), and ordination analysis (DCA and CCA) were applied in the study.
Results: 66 epiphytic diatom species were identified in this study, and 36 of these species are new records for the reservoir.
Most epiphytic diatom species were obtained in August, and the lowest number was obtained in November. According to the
pH values, it was determined that the reservoir is alkaline. In addition, it was determined that the main factors affecting the
distribution of epiphytic diatom species in the reservoir are temperature and conductivity, and it was revealed that ecological
variables affect species distribution.
Conclusion: According to conductivity and DO values, it was determined that the reservoir was of very good and of good
quality, and in terms of DO values, the reservoir was mainly oligotrophic. However, station 5 was mesotrophic during the
August sampling period, station 4 was mesotrophic, and station 5 was eutrophic in November. Also, Büyükçekmece Reservoir
was found in poor and moderate status according to H' classification.
Iran is a large country with a great diversity of aquatic ecosystems including rivers, springs, shallow seas, lakes, waterfalls, lagoons, and wetlands. Despite the many types of aquatic habitats, ...there has been a limited study of the diatom flora. The purpose of this study is to present the diatom species and characterize their distribution in the Karaj River, which flows in Iran's Central Alborz region. The Alborz is one of the Irano-Anatolian ecoregions that serve as biodiversity hotspots. The Central Alborz, located in the middle part of this mountainous area, is an outstanding ecological and geological resource. This study uses the diatom flora to determine the biodiversity in one of the major rivers of the Central Alborz. Periphytic diatom samples were collected monthly from six stations along the length of the Karaj River between May 2011 and April 2012. A total of 128 diatom taxa was found from 48 genera expanding our understanding of regional aquatic diversity as 42 species are recorded as new for the diatom flora of Iran. Furthermore, the biogeography of the diatom flora of the Karaj River is considered in relation to the rest of Iran, the Middle East, and Asian and European diatom communities.
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