Hydrobiological Institute

Ohrid, Macedonia

Hydrobiological Institute

Ohrid, Macedonia

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Hahn C.,University of Oslo | Hahn C.,University of Hull | Weiss S.J.,University of Graz | Stojanovski S.,Hydrobiological Institute | Bachmann L.,University of Oslo
PLoS ONE | Year: 2015

Co-speciation is a fundamental concept of evolutionary biology and intuitively appealing, yet in practice hard to demonstrate as it is often blurred by other evolutionary processes. We investigate the phylogeographic history of the monogenean ectoparasites Gyrodactylus teuchis and G. truttae on European salmonids of the genus Salmo. Mitochondrial cytochrome oxidase subunit 1 and the nuclear ribosomal internal transcribed spacer 2 were sequenced for 189 Gyrodactylus individuals collected from 50 localities, distributed across most major European river systems, from the Iberian- to the Balkan Peninsula. Despite both anthropogenic and naturally caused admixture of the principal host lineages among major river basins, co-phylogenetic analyses revealed significant global congruence for host and parasite phylogenies, providing firm support for co-speciation of G. teuchis and its salmonid hosts brown trout (S. trutta) and Atlantic salmon (S. salar). The major split within G. teuchis, coinciding with the initial divergence of the hosts was dated to ~1.5 My BP, using a Bayesian framework based on an indirect calibration point obtained from the host phylogeny. The presence of G. teuchis in Europe thus predates some of the major Pleistocene glaciations. In contrast, G. truttae exhibited remarkably low intraspecific genetic diversity. Given the direct life cycle and potentially high transmission potential of gyrodactylids, this finding is interpreted as indication for a recent emergence (<60 ky BP) of G. truttae via a host-switch. Our study thus suggests that instances of two fundamentally different mechanisms of speciation (co-speciation vs. host-switching) may have occurred on the same hosts in Europe within a time span of less than 1.5 My in two gyrodactylid ectoparasite species. © 2015 Hahn et al.


PubMed | University of Graz, University of Oslo, Hydrobiological Institute and University of Hull
Type: Journal Article | Journal: PloS one | Year: 2015

Co-speciation is a fundamental concept of evolutionary biology and intuitively appealing, yet in practice hard to demonstrate as it is often blurred by other evolutionary processes. We investigate the phylogeographic history of the monogenean ectoparasites Gyrodactylus teuchis and G. truttae on European salmonids of the genus Salmo. Mitochondrial cytochrome oxidase subunit 1 and the nuclear ribosomal internal transcribed spacer 2 were sequenced for 189 Gyrodactylus individuals collected from 50 localities, distributed across most major European river systems, from the Iberian- to the Balkan Peninsula. Despite both anthropogenic and naturally caused admixture of the principal host lineages among major river basins, co-phylogenetic analyses revealed significant global congruence for host and parasite phylogenies, providing firm support for co-speciation of G. teuchis and its salmonid hosts brown trout (S. trutta) and Atlantic salmon (S. salar). The major split within G. teuchis, coinciding with the initial divergence of the hosts was dated to ~1.5 My BP, using a Bayesian framework based on an indirect calibration point obtained from the host phylogeny. The presence of G. teuchis in Europe thus predates some of the major Pleistocene glaciations. In contrast, G. truttae exhibited remarkably low intraspecific genetic diversity. Given the direct life cycle and potentially high transmission potential of gyrodactylids, this finding is interpreted as indication for a recent emergence (<60 ky BP) of G. truttae via a host-switch. Our study thus suggests that instances of two fundamentally different mechanisms of speciation (co-speciation vs. host-switching) may have occurred on the same hosts in Europe within a time span of less than 1.5 My in two gyrodactylid ectoparasite species.


PubMed | University of Tirana, Veterinary Faculty, Hydrobiological Institute and University of Gdansk
Type: Journal Article | Journal: Annals of parasitology | Year: 2015

Total, 94 specimens of gudgeon (Gobio ohridanus Karaman, 1924) from the Macedonian part of the Lake Ohrid were examined and 61 fishes (64.89%) were infected with parasites. The presence of 4 parasite species was established: Dactylogyrus cryptomeres f. typica (Monogenea), Cystidicoloides tenuissima and Philometra ovata (Nematoda), and Pomphorhynchus laevis (Acanthocephala). The highest prevalence and intensity of infection was with Dactylogyrus cryptomeres f. typica (59.57%; mean intensity 6.07). The lowest one was with Cystidicoloides tenuissima and Philometra ovata (2.13%; 1.0). Dactylogyrus cryptomeres f. typica is recorded for the first time in the ichthyoparasitofauna of Lake Ohrid and Macedonia.


PubMed | University of Belgrade, University of Niš, Hydrobiological Institute and University of Kragujevac
Type: | Journal: The Science of the total environment | Year: 2015

In this study, we aimed to assess the population status of bleak (Alburnus spp.) over the Western Balkan Peninsula in terms of its sustainable use. A second objective was to determine key factors important for fishery management planning. Two different basins, continental (the Danube Basin and the Sava River sub-basin) and marine (the Adriatic and the Aegean Sea Basins) were examined. A sustainability assessment and factor analysis were conducted using the adjusted ESHIPPOfishing model, extended with additional socio-economic sub-elements, and the categorical principal components analysis (CATPCA), respectively. The results of the assessment revealed the bleak populations in the Danube Basin and the Sava River sub-basin to be highly sustainable. The population characteristics with abiotic and biotic factors were responsible for this status, while the influence of socio-economic factors was insignificant. The sustainability status of the bleak populations of the Mediterranean basin varied, with the populations from Ohrid and Skadar Lakes showing a high and those from Prespa and Dojran Lakes a medium status. Socio-economic factors with traditional fishing were the most important for the Mediterranean bleak populations.


Milosevic D.,University of Montenegro | Talevski T.,Hydrobiological Institute
Acta Zoologica Bulgarica | Year: 2016

Data on the length weight relationships (LWR) of 11 fish species from three natural (Prespa, Ohrid and Dojran) and two artificial lakes (Debar and Tikveš) in the Former Yugoslav Republic of Macedonia (FYROM) are presented. These are the first comprehensive LWR data for six (including three endemic) freshwater fish species for the above mentioned lakes, previously unavailable in Fish Base. The values of parameter b range from 1.641 to 4.188, and of a range from 0.0003 to 0.187. The model of growth for all examined species are determined. © 2016 Institute of Biodiversity and Ecosystem Research - BAS.


Veljanoska-Sarafiloska E.M.,Hydrobiological Institute | Stafilov T.,Ss. Cyril and Methodius University of Skopje
Acta Zoologica Bulgarica | Year: 2012

The organochlorine pesticides have been detected in the samples of sediment and muscle tissue of barbell (Barbus peloponnesius, Valenciennes, (1842); Barbus macedonicus, Karaman (1924), collected from the three natural lake ecosystems in the Republic of Macedonia, i.e. Lake Ohrid, Lake Prespa and Lake Dojran, in the period from 2004 to 2006. Special attention has been paid to the presence of the insecticide DDT degradation products, 1,1,1-trichloro-2,2-bis(p- chlorophenyl) ethane (p,p'-DDT), 1,1-dichloro-2,2- bis(p-chlorophenyl)ethylene (p,p'-DDE) and 1,1-dichloro-2,2-bis(p-chlorophenyl)ethane (p,p'-DDD), as dominant components in comparison to the other organochlorine pesticides. The results that have been obtained indicated that dominant metabolic forms in the samples of sediment from Lake Ohrid and Lake Prespa is p,p'-DDE. The mean values for the content of this forms has been estimated at 0.84 μg kg-1 dry sediment in the samples collected from Ohrid and 1.56 μg kg-1 dry sediment in the samples from Lake Prespa. In the samples of sediment that have been collected from Lake Dojran, the dominant was the p,p'-DDT form, while it's content has been estimated at 4.06 μg kg-1 dry sediment. The highest values for the content of the sum of DDT metabolic forms in the fish muscle tissue have been evidenced in the samples of fish collected from Lake Dojran and the average value of this sum has been estimated at 16.38 μg kg-1 fresh tissue. The dominant metabolic forms for the analyzed muscle tissues of fish for all three lake ecosystems has been p,p'-DDE. The content of this form have been estimated at 5.98 μg kg-1, 7.21 μg kg-1 and 9.77 μg kg-1 for the samples collected from Lake Ohrid, Lake Prespa and Lake Dojran, respectively. Thus, the highest evidenced value for the presence of p,p'-DDE has been recorded for the samples collected from Lake Dojran, i.e. 9,77 μg kg-1 fresh tissue.


Veljanoska-Sarafiloska E.,Hydrobiological Institute | Jordanoski M.,University of Macedonia | Stafilov T.,Hydrobiological Institute | Stefova M.,Ss. Cyril and Methodius University of Skopje
Macedonian Journal of Chemistry and Chemical Engineering | Year: 2011

A systematic study has been performed for determination of a range of organochlorine pesticides in the water, sediments and fish samples in the Macedonian part of the Lake Ohrid and its larger tributaries. The obtained results give an overview of the contamination levels of these problematic compounds (i) at their potential sources in the river mouths, (ii) in the potentially affected, species-rich littoral section of the lake, and (iii) in the muscle tissue of one selected fish species Barbus peloponnesius, Valenciennes, collected near the rivers' deltas. The organochlorine pesticides measured in all three matrixes were: γ-HCH, ΣHCH (sum of α-isomer, β-isomer and δ-isomer), endosulfan (total of α and β endosulfan), DDT metabolites (p,p'-DDE, p,p'-DDD and p,p'-DDT). The range of the observed concentrations for p,p'-DDT was between 0.006 μg l -1 in the water samples from Daljan and St. Naum and 0.036 μg l -1 in the water from the Koselska River. The values for p,p'-DDT measured in dry sediment ranged from 0.121 μg kg -1 in the sample from St. Naum to 1.8 μg kg -1 in the dry sediment from the Velgoška River and between 0.553 μg kg -1 for total endosulfan and 5.982 μg kg -1 for p,p'-DDE of wet fish biomass. The most abundant of the detected organochlorine pesticides was the sum of DDT metabolic forms, i.e. p,p'-DDT, p,p'-DDE and p,p'-DDD. The detected concentrations are clearly below toxic thresholds and consequently severe effects on the endemic species of Lake Ohrid are not very likely.


Tasevska O.,Hydrobiological Institute | Jersabek C.D.,University of Salzburg | Kostoski G.,Hydrobiological Institute | Guseska D.,Hydrobiological Institute
Biologia | Year: 2012

We investigated monogonont rotifers in two natural Macedonian lakes that greatly differ in age, size and trophic state: Lake Ohrid and Lake Dojran. A main characteristic of Lake Ohrid is the scarcity of nutrients and consequently a low level of primary production. Lake Dojran represents a typical eutrophic lake. Results clearly indicate that species numbers are negatively correlated with trophic degree. Qualitative analyses of rotifer compositions in Lakes Ohrid and Dojran showed the presence of 70 and 55 taxa, respectively. Rotifer assemblages differed in their community structure, population densities, and the occurrence pattern of dominant species. The density of rotifers increased with increasing nutrient concentration, varying from min. 0.67 ind. L -1 in June, 2006 to max. 8.2 ind. L -1 in July, 2004 in Lake Ohrid, whereas min. 28.8 ind. L -1 (in December, 2005) and max. 442. 5 ind. L -1 (in September, 2005) were recorded in Lake Dojran. Gastropus stylifer and Keratella cochlearis were the most abundant species in the pelagic zone of Lake Ohrid, averaging monthly densities of 1.2 ind. L -1 and 0.6 ind. L -1, respectively, thereby contributing 29% and 15% to rotifer abundance. In contrast, Lake Dojran rotifers were dominated by Brachionus spp. Brachionus diversicornis and Brachionus calyciflorus f. amphiceros were most abundant, comprising 40% and 25% of the total rotifer density. These results corroborate our idea, that the trophic state is an important factor in determining the composition of rotifer communities. © 2012 Versita Warsaw and Springer-Verlag Wien.


Guseska D.,Hydrobiological Institute | Tasevska O.,Hydrobiological Institute | Kostoski G.,Hydrobiological Institute
Biologia | Year: 2012

The composition and temporal abundance patterns of zooplankton community in Lake Prespa pelagic zone were studied throughout an annual cycle (October 2008-September 2009). Eighteen species (10 Rotifera, 5 Cladocera, 2 Copepoda, 1 Mollusca) were evidenced. It includes Arctodiaptomus steindachneri, an endemic calanoid of the Western Balkans. The zooplankton density varied during the investigated period and certain seasonal successions in temporal transpositions of their maximal development were noticed. The total zooplankton density was much higher in spring and summer period. The representatives of subclass Copepoda were dominant during the whole year. The dominant species was A. steindachneri. At the second place (with exception of the winter period) were the Cladocera representatives. The dominant species was Daphnia cucullata. At the third and fourth place were rotifers and larval form of Dreissena polymorpha, respectively. The quantitative presence of the Copepoda representatives was significantly lower in terms of the previous investigations. The Cladocera quantity reached high values during this period, particularly in summer. Such altering in the quantitative ratio between Copepoda and Cladocera in favor of the Cladocera, especially high quantitative presence of D. cucullata, typical for eutrophic lakes, imply of significant changes in zooplankton community and changes of the water quality in Lake Prespa pelagial. © 2012 Versita Warsaw and Springer-Verlag Wien.


Veljanoska-Sarafiloska E.,Hydrobiological Institute | Stafilov T.,University of Macedonia | Jordanoski M.,University of Macedonia
Fresenius Environmental Bulletin | Year: 2011

In the period from 2004-2006, investigations of 1,1,1trichloro-2,2-bis(4- chlorophenyl)ethane (DDT) in littoral sediments and the muscle tissue of the bottom-dwelling fish (Barbus macedonicus Karaman) have been conducted in Lake Dojran, Republic of Macedonia. Special emphasis was given to the presence the DDT degradation products 1,1,1-trichloro-2,2- bis(p-chlorophenyl) ethane (p,p'-DDT), 1,1 -dichloro-2,2-bis(p-chlorophenyl)ethylene (p,p' -DDE) and 1,1-dichloro-2,2-bis(p-chlorophenyl)ethane (p,p'-DDD). Sediment samples showed a dominance of p,p'-DDT, ranging from 3.55 μg kg -1 to 5.01 μg kg -1 of sediment dry mass, whereas p,p'-DDE was dominant in the muscle tissue of the bottom-dwelling fish Barbus macedonicus Karaman, with contents between 8.98 μg kg -1 and 10.85 μg kg -1 fresh tissue. Although DDT concentrations were below international health standards they may increase anthropogenic pressure on the unique and vulnerable ecosystem of Lake Dojran. The general findings underline the long period of intensive usage of DDT in the Southern Balkans, as well as its great persistence in agriculturally impacted surface waters. Furthermore, DDT-ratios in the sediment indicated use after the official ban of the pesticide, a situation, which may be representative for a range of surface waters in southeastern Europe. © by PSP.

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