33 research outputs found

    SYMBIOCLADIUS RHITHROGENAE (ZAVREL, 1924) (DIPTERA: CHIRONOMIDAE): A NEW FINDING FOR THE ENTOMOFAUNA OF SERBIA

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    During hydrobiological research on the territory of Serbia in 2011 and 2012, the species Symbiocladius rhithrogenae (Zavrel, 1924) (Diptera: Chironomidae) was found in the Rača stream at three localities. Our study is the first record of this parasite in Serbia. The parasite only infected the larvae of Rhithrogena cf. semicolorata (Ephemeroptera: Heptageniidae) and was not found in any other species from the family Heptageniidae. This study contributes to the knowledge about the diversity of the family Chironomidae in Serbia

    Mikroplastika u slatkovodnim ekosistemima: in-situ i ex-situ istraživanja na odabranim model organizmima makrobeskičmenjaka

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    In this doctoral dissertation, the influence of the most common types of microplastic polymers on different levels of biological and ecological organization of benthic macroinvertebrates in freshwater ecosystems is analyzed. Multiparametric bioassays were conducted, based on OECD protocols Nos. 218 and 219, on the model species Chironomus riparius (Meigen, 1804). The influence of the mixture of microplastic particles (PET, PS, PVC, PA, PE, PP) on a series of standard biomarkers (morality, survival, time and rate of development and emergence) was analyzed. Using the method of geometric morphometry, the influence on the morphological structures of larvae (mentums and mandibles), as well as adults (wings) was analyzed. OECD tests have been applied in ex-situ environmental conditions, but also on populations of the same species in in-situ mesocosms in the lake ecosystem. The negative influence of microplastic polymers on the time of larval development and on the delay of adult hatching has been proven. Exposure of individuals to microplastic particles resulted in changes in the morphological structures of larvae and adults. An analysis of the degree of influence of the mixture of microplastic polymers (PE, PA and PVC) on the structure of the macroinvertebrate community of the pristine pond ecosystem was performed, where 16 % of the difference in diversity between control and treatment was observed. For the first time, an analysis of the presence of microplastic particles in the Danube basin was performed, using selected species from the macroinvertebrate community. The analysis of the chemical composition of isolated microplastic particles from the tissue model of the species Corbicula fluminea (MĆ¼ller, 1774) is the first analysis in the Danube basin at 2040 riverine kilometers. Micro-FTIR spectroscopic analysis confirmed the presence of microplastic particles in the tissue of Asian clams, with a dominant presence of polyethylene terephthalate

    Monitoring the effect of trout farms on the antioxidative enzyme activity level in Ephemera danica larvae (Insecta, Ephemeroptera)

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    U monitoringu povrÅ”inskih voda neophodno je pored praćenja abiotičkih faktora uključiti i biotičku komponentu tj. analizirati sastav i strukturu zajednica vodenih organizama. Da bi se dobila kompletnija slika o stanju vodenog ekosistema koriste se organizmi bioindikatori. Larva Ephemera danica ima specifične morfoloÅ”ke i funkcionalne karakteristike te je pogodan model organizam za studije biomonitoringa. Cilj doktorske disertacije je praćenje uticaja ispusnih voda pastrmskog ribnjaka na nivo aktivnosti enzima antioksidativne zaÅ”tite kod larvi E. danica, ispitivanje stepena bioakumulacije teÅ”kih metala u telu larvi, vodi i sedimentu reke Skrapež, utvrđivanje faunističkog sastava makrozoobentosa istraživane tekućice. HidrobioloÅ”ka istraživanja reke Skrapež sprovedena su tokom 2015. (proleće, leto i jesen) i 2016. godine (zima) na jednom lokalitetu iznad i tri lokaliteta nizvodno od pastrmskog ribnjaka. Dvofaktorska analiza varijanse je pokazala da aktivnost SOD karakteriÅ”e veća sezonska varijabilnost, aktivnost GPx karakteriÅ”e značajnija longitudinalna varijabilnost i u svim sezonama dolazi do statistički značajnog porasta aktivnosti GPx na drugom lokalitetu, Å”to ukazuje da organsko zagađenje poreklom sa ribnjaka indukuje oksidativni stres kod vrste E. danica. Koncentracija ukupnog glutationa (GSH) dostiže maksimum u jesen na drugom lokalitetu, Å”to je negativan uticaj pastrmskog ribnjaka. Analiza CIA je pokazala postojanje statistički značajne kostrukture između PCA korelacione matrice koncentracija teÅ”kih metala u sedimentu i u telu E. danica. Indeks saprobnosti ukazuje na uticaj ribnjaka kroz pogorÅ”anje kvaliteta vode nizvodno od njega. Njegov uticaj je i u smanjenju procenta sekača nizvodno od ribnjaka, a povećanju sakupljača, aktivnih i pasivnih sakupljača filtratora.biotic component, i.e., to analyses the composition and structure of communities of aquatic organisms. Bioindicator organisms are used to get a more complete picture of the state of an aquatic ecosystem. The larva of Ephemera danica has specific characteristics that make it a suitable model organism for biomonitoring studies. The purpose of the doctoral dissertation was to monitor the influence of outlet water of a trout farm on the level of activity of antioxidative defense enzymes in larvae of E. danica; test the degree of bioaccumulation of heavy metals in the body of larvae, water, and sediment, and establish faunistic composition of the macrozoobenthos. Hydrobiological investigation of the Skrapež River was conducted during 2015 (spring, summer, and fall) and 2016 (winter) at one locality upstream from the trout farm and three localities downstream from it. Two-factor analysis of variance showed that SOD activity is characterized by high seasonal variability, GPx activity is characterized by considerable longitudinal variability, and a statistically significant increase of GPx activity occurs in all seasons at the second locality, which indicates that organic pollution originating from the fish farm induces oxidative stress in the species E. danica. The concentration of total glutathione (GSH) attains a maximum in the fall at the second locality, which is a negative effect of the trout farm. Use of CIA revealed the existence of a statistically significant contracture between PCA of the correlation matrix of heavy metal concentrations in the sediment and in the body of E. danica. The saprobity index indicates influence of the fish farm in the form of a worsening of water quality downstream from it. Influence of the fish farm manifested in a decrease in the choppers at localities downstream from it, and an increase in the gatherers (active and passive gatherer-filterers)

    Feeding selectivity of brown trout Salmo cf. trutta (L.) as a factor of fishing success

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    Potočna pastrmka je u rekreativnom ribolovu cenjena riblja vrsta, otuda i neposustajuće interesovanje za ponaÅ”anje ove vrste sa aspekta njene ishrane. Vizuelni je predator, hrani se vodenim i kopnenim beskičmenjacima i sitnijim ribama, a većina autora smatra je generalistom i oportunistom. Ciljevi studije bili su ispitati sezonsku dinamiku ishrane potočne pastrmke na tri pastrmska vodotoka različitih karakteristika, razlike u rastu i produkciji pastrmke i njihovu korelaciju sa karakteristikama staniÅ”ta, kao i značajnost i selektivnost različitih vrsta plena u ishrani pastrmke, gde je selektivnost tokom sezone izražena Electivity indeksom, kako bi se dala preporuka za uspeÅ”an pristup ribolovu na ovu vrstu na različitim tipovima staniÅ”ta. Karakteristike staniÅ”ta važne za izbor načina ribolova su geologija područja, abundanca i diverzitet plena, bogatstvo drifta i doba godine. Visoka provodljivost vode ima pozitivan uticaj na produkciju plena, a samim tim i produkciju pastrmke. Najzastupljeniji plen na staniÅ”tu obično je negativno selekcionisan, osim na početku i/ili na kraju sezone kada je drugi plen manje dostupan. Za redak plen postoji pozitivna selekcija pa bi imitacije takvog plena mogle biti uspeÅ”nije. Imitacije bentosnog plena treba birati u skladu sa abundancom i sezonskom dinamikom, a različite imitacije terestričnog plena koristiti pred kraj sezone jer je tada izrazito pozitivno selekcionisan. Pastrmka brzo reaguje na promene u dostupnosti plena, ali je moguće predvideti koja će imitacija biti uspeÅ”na na osnovu karakteristika staniÅ”ta i sezonske dinamike. Na staniÅ”tima sa manjom abundancom ali visokim diverzitetom plena moguć je uspeÅ”an ribolov sa raznovrsnim imitacijama, dok će selektivnost biti izraženija na plenom bogatim staniÅ”tima.Brown trout is a valuable species in recreational fishing, hence the persistant interest in its feeding behavior. It is a visual predator, that feeds on aquatic and terrestrial invertebrates and smaller fish. Many authors considered it both a generalist and opportunist. The aims of the study were to determine seasonal dynamics of brown trout diet on three salmonid watercourses with different characteristics, difference in trout growth and production and to examine their correlation to habitat characteristics, significance and selectivity of different prey, where the selectivity was assessed by Electivity index, so that successful fly fishing approach could be proposed for different habitats. The habitat characteristics important for choosing fishing approach are geology of the area, prey abundance and diversity, drift richness and time of the season. High water conductivity has a positive impact on prey production, and consequently high trout production. The most abundant prey in the habitat is usually negatively selected, except at the beginning and/or the end of the season when other preys are less available. Positive selection exists for rare preys so imitations of such prey can be more successful. Imitations of benthic prey should be chosen with respect to its abundance and seasonal dynamics, and various imitations of terrestrial prey should be used more near the end of the season when it is positively selected. Trout react quickly to changes in prey availability, but which imitation will be successful can be predicted based on habitat characteristics and seasonal dynamics. Successful fishing with various imitations is possible in habitats with lower abundance but high diversity of prey, while selectivity will be more pronounced in prey-abundant habitats

    The effect of different supplemental feed types in semi-intensive production of common carp fry (Cyprinus carpio) on the structure and dynamics of pond ecosystems

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    Dobro poznavanje kompleksnih ekoloÅ”kih odnosa u toplovodnim ribnjacima vaÅ£an je preduslov uspeÅ”ne Å”aranske proizvodnje u poluintenzivnom sistemu uzgoja. Poslednjih godina dolazi do intenziviranja proizvodnje Å”arana u Jugoistoĉnoj Evropi (Srbiji, Bosni i Hercegovini, Hrvatskoj, Bugarskoj i Rumuniji) kroz sve Å”iru upotrebu koncentrovane hrane, peletirane i ekstrudirane, umesto Å£itarica. Intenziviranje proizvodnje ovih riba nosi sa sobom promene u strukturi i dinamici ribnjaĉkog ekosistema. U periodu od juna do oktobra u devet ribnjaĉkih objekata na ribnjaku ''Kapetanski rit'' na severu Srbije ispitivan je uticaj tri razliĉita tipa dodatne hrane za dvogodiÅ”nju Å”aransku mlaĊ na fiziĉke i hemijske osobine vode, strukturu fitoplanktonske, zooplanktonske i bentosne zajednice ribnjaka i rast Å”arana. U istraÅ£ivanju su koriŔćena tri tipa dodatne hrane: kombinacija Å£itarica u zrnu (kukuruz, pÅ”enica i jeĉam), komercijalna peletirana i komercijalna ekstrudirana hrana sa 25% proteina i 7% masti. Pored toga, analizirana je priroda i jaĉina meĊuzavisnosti razliĉitih komponenata ribnjaĉkog ekosistema primenom analize redundantnosti (RDA). Tip dodatne hrane nije statistiĉki znaĉajno uticao na pokazatelje kvaliteta vode, izuzev na tvrdoću vode, ali je znaĉajno uticao na brojnost cijanobakterija, zooplanktona, bentosnih organizama i rast Å”aranske mlaĊi. Tako su jezera sa razliĉitim tipom dodatne hrane bila ujednaĉena u pogledu kvalitativnog sastava fitoplanktonske i zooplanktonske zajednice, dok su se znaĉajna odstupanja javila u kvantitativnom sastavu planktona. Cijanobakterije su bile dominantna grupa fitoplanktonskih organizama u svim jezerima, ali je u proseku njihova brojnost bila najmanja u grupi jezera u kojima je riba hranjena peletiranom hranom. TakoĊe, proseĉna brojnost Cladocera i Copepoda je u jezerima sa peletiranom hranom bila znaĉajno veća u odnosu na jezera sa Å£itaricama i ekstrudiranom hranom, a brojnost makrozoobentosa je bila veća u odnosu na jezera sa Å£itaricama. Rast dvogodiÅ”nje Å”aranske mlaĊi je bio znaĉajno manji u objektima u kojima je koriŔćena kombinacija Å£itarica u odnosu na zimovnike sa dodatkom peletirane i ekstrudirane hrane izmeĊu kojih nije bilo znaĉajnih razlika...Good understanding of complex ecological relationship in carp ponds is an important prerequisite for successful common carp production in semi-intensive system. In recent years it has come to an intensification of carp production in South-East Europe (Serbia, Bosnia and Herzegovina, Croatia, Bulgaria and Romania) through the wider use of industrially compounded feeds, pelleted and extruded, instead cereals. Intensification of production of these fish carries with it changes in the structure and dynamics of the pond ecosystem. The study was conducted from June to October 2009 in nine earthen fishponds at the carp farm ''Kapetanski rit'' in the north of Serbia. The influence of three different supplemental feed types for the two-year carp fry on the physical and chemical properties of water, structure of phytoplankton, zooplankton and benthic pond communities and carp growth was examined. Three types of supplemental feed were used: a combination of cereal grains (corn, wheat and barley), commercial pelleted and commercial extruded feed with 25% of proteins and 7% of fat. In addition using the redundancy analysis (RDA), the nature and strength of the interdependence of various components of pond ecosystems was analysed. The type of supplemental feed did not significantly affect the quality of water, except the hardness of water, but had a significantly effect on the abundance of cyanobacteria, zooplankton, benthic organism and the growth of carp fry. Thus ponds with different type of supplemental feed seemed more uniform in terms of the qualitative composition of the phytoplankton and zooplankton communities, while significant discrepancies occurred in the quantitative composition of these communities. Cyanobacteria were the dominant group of phytoplankton organisms in all ponds, but on average their numbers were the lowest in the group of ponds in which pelleted feed was used. Also, the average number of Cladocera and Copepoda in the ponds with pelleted feed was significantly higher than in ponds in which cereals and extruded feed were used, and abundance of benthic macroinvertebrates was higher than in ponds in which cereals were used..

    THE NUTRITION OF A BROWN TROUT Salmo trutta m. fario IN THE RIVER UNA

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    Na osnovi izlova 103 jedinke potočne pastrve (Salmo trutta m. fario Linnaeus, 1758) na 15 lokaliteta u slijevu rijeke Une u općini Bihać provedena je analiza želučanoā€“crijevnog trakta u svrhu upoznavanja njezine prehrane. Izlov ribe obavljen je električnim agregatom i ručnim sakom. Disekcija potočne pastrve, izdvajanje digestivnoga trakta i pregled sastava ovog dijela probavnog sustava izvedeni su u laboratoriju Centra za ihtiologiju i ribarstvo Prirodnoā€“matematskog fakulteta Univerziteta u Sarajevu. Dobiveni rezultati analize prehrane potočne pastrve donekle se poklapaju s podacima iz literature (Mc C o rma c , 1962; E l l i o t , 1967; Å  e n k i A g a n o v i ć , 1968; T u Å” a , 1968; K a ć a n s k I i K o s o r i ć , 1970; P o p o v s k a ā€” S t a n k o v i ć i G e o r g i e v , 1973; K a - ć a n s k i i sur., 1988). Dominantno su se jedinke potočne pastrve u istraživanim lokalitetima hranile makroinvertebratima bentosa (dna). Najveći postotak riba u svojoj prehrani upotrebljava preimaginalne stadije dvokrilnih insekata (45,45 %) i tulara (42,42 %). Utvrđen je mali broj riba koje su se hranile peÅ”om (7,07%). Utvrđena je također velika ovisnost prehrane potočne pastrve o kvalitativnoā€“kvantitativnom sastavu bentosa (T r o ž i ć ā€“ B o r o v a c , 2001). Vrlo mali broj riba hranio se algama (1,01 %). Prema ovim rezultatima može se uvjetno govoriti o zoofagu. Registrirane su i jedinke s praznim želucem, ali dobro razvijenim digestivnim traktom (4,04 %). Ovaj podatak u vezi je sa sezonom izlova, kada je potočna pastrva u rijeci Uni bila pred mrijestom pa se manje hranila. Za sve jedinke potočne pastrve izračunan je faktor kondicije (CF) koji se kreće od 1,00 do 1,59. Prema prosječnoj masi od 21,77 g i prosječnoj duljini od 133,37 cm taj faktor za analizirane ribe iz slijeva Une iznosi 1,09.An analysis of the contents of gastricā€“intestine system of a brown trout was made on the base of the capture 103 specimens in the aim of the description of its nutrition. The capture was made at the 15 places in the confluence of the river Una, commune Bihac, by generating sets and sacks. The dissection of a brown trout, extraction of gastricā€“intestine system and its fixation in 4 % formaldehid was made at the terrain. Further treatment and examination of the contents of gastricā€“intestine system was made in the laboratory of Ichtiological and Fishing Center of Faculty of Science, University of Sarajevo. The obtained results of the analysis of the nutrition of a brown trout are particulary similar with the literature data (Mc Cormac, 1962; Elliot, 1967; Å enk and Aganović, 1968; TuÅ”a, 1968; Kaćanski and Kosorić, 1970; Popovska ā€” Stanković and Georgiev, 1973; Kaćanski et al., 1988). On investigated places, the specimens of a brown trout dominantly fed by macroinvertebrat of the benthos of the bottom. The large percentage of fish use larvae stages of the twoā€“winged insects (45,45%) and caddisflies (42,42 %) in their nutrition. The small number of fish fed with bullhead (7,07 %). Great dependence was determined in the nutrition of a brown trout by qualitativeā€“quantitative composition of the benthos (Trožićā€“Borovac, 2001). The very small number of fish fed with algae (1,01 %). According to these results, we can conditionally speak about zoofag. The specimens with empty stomach, but very good developed gastricā€“intestine system, was also registrated (4,04 %). This data is related to the time of the capture (the season of reproduction of brown trout when it takes less food). The condition factor was calculated for all the specimens of brown trout. The values of the condition factor are from 1,00 to 1,59. According to the average weight 21,77 g and average leingth 133,37 cm the condition factor for the analyzed fish from the confluence of the river Una is 1,09

    Ecological characteristics and morphological-genetic differentiation in populations of European mudminnoow (Umbra krameri Walbaum, 1792) from Bačka, Mačva and Semberija

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    Crnka (Umbra krameri Walbaum, 1792) je jedina autohtona i reliktna vrsta iz roda Umbra prisutna u Evropi, endemična za basene Dunava i Dnjestra. U okviru danaÅ”njeg diskontinuiranog areala, usled isuÅ”ivanja i zagađivanja staniÅ”ta, populacije crnke značajno su smanjene poslednjih decenija XX veka. Iz navedenih razloga crnka se nalazi na IUCN Crvenoj listi ugroženih vrsta i ima status ranjive vrste (VU). Na nacionalnom nivou ima status kritično ugrožene vrste (CR) i nalazi se u neposrednoj opasnosti od iŔčezavanja. U ovoj disertaciji su uz distribuciju vrste u Srbiji i Bosni i Hercegovini, sa novozabeleženom populacijom u Srbiji (lokalitet Lugomir), prikazani i rezultati analize ekoloÅ”kih karakteristika i morfoloÅ”ko-genetičke diferencijacije istraživanih populacija, a dat je i status ugroženosti vrste na nacionalnom nivou sa ugrožavajućim faktorima i merama zaÅ”tite i očuvanja. Za potrebe rada uzorkovano je ukupno 76 jedinki iz tri populacije, dve iz Srbije (23 jedinke sa lokaliteta Lugomir i 21 jedinka sa lokaliteta Bakreni Batar) i jedna iz Bosne i Hercegovine (32 jedinke sa lokaliteta Gromiželj). Za svaki istraživani lokalitet određeni su osnovni geografski parametri (geografska dužina, Å”irina i nadmorska visina) i fizičko-hemijske karakteristike staniÅ”ta (Å”irina vodenog basena, dubina vode i mulja, temperatura vode i vazduha, pH vrednost, elektroprovodljivost, koncentracija kiseonika, saturacija kiseonikom, koncentracije amonijaka, nitrita i fosfata). Sve jedinke u uzorku su prvo fotografisane za potrebe analiza geometrijske morfometrije, a nakon toga su im merene totalna (TL) i standardna (SL) dužina tela i težina tela za potrebe analize strukture populacija. Takođe, jedinkama su uzete gonade za utvrđivanje pola, uzorci digestivnog trakta za analizu ishrane, uzorci krljuÅ”ti za određivanje starosti i uzorci tkiva za analizu genetičke varijabilnosti. Na svim istraživanim lokalitetima utvrđen je kvalitativni sastav biljaka i riba, a izvrÅ”eno je i uzorkovanje beskičmenjaka iz mulja i submerzne vegetacije u cilju utvrđivanja njihovog kvalitativnog i kvantitativnog sastava i analize ishrane crnke. Sva tri istraživana lokaliteta prema analiziranim fizičko hemijskim parametrima i sastavom zajednice biljaka i riba predstavljaju tipična staniÅ”ta crnke...European mudminnow (Umbra krameri Walbaum, 1792) is the only autochthonous and relic species of the genus Umbra present in Europe, and it is endemic for the Danube and Dniester river basins. In scope of its present discontinuous range, due to habitat desiccation and pollution, the populations of European mudminnow significantly decreased during the last decades of the 20th century. For this reason it is listed on the IUCN Red List of Threatened Species as Vulnerable (VU). At the national level, it is listed as Critically Endangered (CR), with a serious threat to be soon extinct. The range of the species in Serbia and in Bosnia and Herzegovina is presented in this dissertation, including a newly recorded population in Serbia (locality Lugomir), along with the results of ecological and morphological-genetic differentiation of the analysed populations, and the threat status at the national level with threat factors and conservation measures. A total of 76 individuals from three populations, two from Serbia (23 individuals from Lugomir and 21 individuals from Bakreni Batar) and one from Bosnia and Herzegovina (32 individuals from Gromiželj), were sampled. Basic geographical parameters (longitude, latitude, altitude) were determined for each locality, along with physical and chemical habitat parameters (width of the water basin, water and silt depth, water and air temperature, pH, electroconductivity, oxygen concentration, oxygen saturation, ammonia, nitrites, phosphates). All sampled individuals were photographed for the purpose of geometric morphometrics analyses, and their total (TL) and standard (SL) body length and body weight were measured for population stucture analyses. Furthermore, gonads were taken for sex determination, digestive tract for diet analysis, scales for age determination, and tissue samples for genetic variability analysis. Species composition of aquatic plants and fishes was determined at all localities, and invertebrates from mud and submersed vegetation were sampled with the aim to determine their diversity and to analyse the diet of European mudminnow. For their physical-chemical parameters and aquatic plant and fish species composition all three studied localities represent typical habitats of European mudminnow..

    First limnological investigations of the water quality of the Lake Srebrno in Serbia

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    The first limnological investigations of the Lake Srebrno water quality were performed in March 2007. The investigations included qualitative, quantitative, and saprobiological analyses of bottom fauna communities, physical chemical analyses of sediments and the determination of chlorophyll a concentration, as well as analyses of the trophic status. Samples were collected at eighteen localities distributed along the shore line, as well as from the deep parts of the lake. Twenty taxa from nine macro-invertebrate groups were recorded. The classification of the water in Lake Srebrno was proposed, based on trophic and saprobic levels. Trophic levels were in the range of upper limits of meso- to eutrophy, and within the limits of the eutrophic status. Calculated values of the Saprobic Index S, based on bio-indicator organisms of macrozoobenthos, ranged from S=2.81 to S=3.58. The water quality was estimated to be within the limits proposed to III and IV-III class of the Serbian (Yugoslav) watercourses.Tokom marta 2007. godine obavljena su prva istraživanja kvaliteta vode Srebrnog jezera u Srbiji. Ispitivanja su obuhvatila kvalitativnu, kvantitativnu i saprobioloÅ”ku analizu zajednica makrozoobentosa, fizičko-hemijsku analizu sedimenata i određivanje koncentracije hlorofila, a kao i analizu trofičnog statusa. Uzorci su sakupljeni sa osamnaest lokaliteta, raspoređenih duž obale u litoralu i iz dubljih zona jezera. U okviru faune dna, zabeleženo je devet faunističkih grupa sa ukupno dvadeset taksona. Procenjivan je kvalitet vode Srebrnog jezera sa stanoviÅ”ta trofije i saprobnosti. Stupanj trofije Srebrnog jezera je u oblasti gornje granice mezo- na prelazu u eutrofiju i u granicama eutrofnog statusa. Izračunate vrednosti saprobnog indeksa S po metodi Pantle-Bucka, primenom saprobnog sistema bioindikatorskih vrsta makrozoobentosa, bile su u opsegu od S=2,81 do S=3,60. Procenjeni kvalitet vode bio je u granicama III i na prelazu IV-III klasu.nul

    Ecological analysis of macrozoobenthos communities in the NiŔava River

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    Doktorska disertacija obuhvata ekoloÅ”ku analizu zajednica makrozoobentosa reke NiÅ”ave i njihovu zavisnost od biotičkih i abiotičkih faktora. Istraživanja su obavljena mesečnom dinamikom na dvanaest lokaliteta od maja 2006. do aprila 2007. godine. U disertaciji se diskutuje zavisnost koncentracije hlorofila a i mase perifitona od abiotičkih faktora. Sa druge strane, razmatran je pritisak (na osnovu brojnosti) filtratornih vrsta zajednice makroinvertebrata na količinu fitoplanktona (izraženu preko hlorofila a) i pritisak grebača na masu perifitona. Dobijen je predikcioni model za izračunavanje koncentracije hlorofila a koriŔćenjem multiple linearne regresije. Model ima značajnu predikcionu moć (sig=0,003). Na osnovu Pirsonovog koeficijenta korelacije konstatovano je da postoji značajna povezanost koncentracije hlorofila a sa mutnoćom (p=0,000), sa ukupnim fosforom (p=0,029) i sa kombinovanom (zbirnom) koncentracijom ukupnog azota i fosfora (p=0,036). Nije utvrđena značajna povezanost sa brojnoŔću filtratornih organizama, Å”to govori da njihov pritisak nije dovoljno jak da bi limitirao količinu fitoplanktona. Taksonomskom analizom makroinvertebrata reke NiÅ”ave utvrđeno je prisustvo 132 vrste iz 4 različita filuma. Filum Platyhelminthes je predstavljen sa 3 vrste iz 2 familije. Filum Annelida obuhvata 23 vrste iz 6 familija. Najveći broj vrsta ovog filuma pripada potklasi Oligochaeta (16 vrsta). Filum Mollusca obuhvata 13 vrsta iz 5 familija, od kojih 11 pripada klasi Gastropoda, a 2 klasi Bivalvia. Najveći broj vrsta faune makroinvertebrata pripada filumu Arthropoda (92 vrste iz 33 familije), od kojih 3 pripadaju subfilumu Crustacea, a sve ostale podfilumu Hexapoda, odnosno klasi Insecta. Rezultati taksonomske analize pojedinačnih grupa u okviru zajednice makroinvertebrata pokazuju da najveći broj vrsta pripada grupi Ephemeroptera (28 vrsta), zatim slede Diptera (26 vrsta) i Trichoptera (20 vrsta). Ostale grupe su zastupljene sa manjim brojem vrsta. Diskutovana je sezonska i longitudinalna dinamika grupa makroinvertebrata i njihova uslovljenost faktorima sredine. Razmatrani su indeksi diverziteta i adekvatnost njihovog koriŔćenja kao pokazatelja zagađenosti ekosistema, posebno za svaku grupu...This doctoral dissertation comprises the ecological analysis of macrozoobenthos communities in the NiÅ”ava River and their dependence on biotic and abiotic factors. The studies followed the monthly dynamics at 12 sites, from May 2006 to April 2007. The dissertation is discussing the dependence of chlorophyll a concentration and periphyton mass on abiotic factors, as well as the pressure (based on abundance) of filtrating species in the macroinvertebrate community on the amount of phytoplankton (expressed as chlorophyll a) and pressure of scraper species on periphyton mass. The prediction model for calculating chlorophyll a concentration was derived from the multiple linear regression. This model has a significant prediction power (sig=0.003). The Pearson's correlation coefficient was used to determine the correlation of chlorophyll a concentration with water turbidity (p=0.000), total phosphorus (p=0.029) and combined (summative) concentration of total nitrogen and total phosphorus (p=0.036). No significant connection with the abundance of filtrating organisms was determined, which indicates that their pressure was not strong enough to limit the quantity of phytoplankton. The taxonomic analysis of macroinvertebrates in the NiÅ”ava River yielded the presence of 132 species from 4 different phyla. The phylum Platyhelminthes was represented with 3 species from 2 families. The phylum Annelida was represented with 23 species from 6 families. Most recorded species from this phylum belong to the subclass Oligochaeta (16 species). The phylum Mollusca was represented with 13 species from 5 families, of which 11 were from the class Gastropoda and 2 from the class Bivalvia. Most species of the macroinvertebrate fauna belong to the phylum Arthropoda (92 species from 33 families), of which 3 were from the subphylum Crustacea, while all others belong to the subphylum Hexapoda and class Insecta. The results of the taxonomic analysis of individual groups within the macroinvertebrate community have shown that most species belong to the group Ephemeroptera (28 species), followed by Diptera (26 species), and Trichoptera (20 species). Other groups were represented with a smaller number of species. The study also includes the discussion on seasonal and longitudinal dynamics of macroinvertebrate groups and the effect of environmental factors on their presence. The diversity indices and their suitability as indicators of ecosystem pollution were discussed for each group separately..

    First limnological investigations of the water quality of the Lake Srebrno in Serbia

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    The first limnological investigations of the Lake Srebrno water quality were performed in March 2007. The investigations included qualitative, quantitative, and saprobiological analyses of bottom fauna communities, physical chemical analyses of sediments and the determination of chlorophyll a concentration, as well as analyses of the trophic status. Samples were collected at eighteen localities distributed along the shore line, as well as from the deep parts of the lake. Twenty taxa from nine macro-invertebrate groups were recorded. The classification of the water in Lake Srebrno was proposed, based on trophic and saprobic levels. Trophic levels were in the range of upper limits of meso- to eutrophy, and within the limits of the eutrophic status. Calculated values of the Saprobic Index S, based on bio-indicator organisms of macrozoobenthos, ranged from S=2.81 to S=3.58. The water quality was estimated to be within the limits proposed to III and IV-III class of the Serbian (Yugoslav) watercourses.Tokom marta 2007. godine obavljena su prva istraživanja kvaliteta vode Srebrnog jezera u Srbiji. Ispitivanja su obuhvatila kvalitativnu, kvantitativnu i saprobioloÅ”ku analizu zajednica makrozoobentosa, fizičko-hemijsku analizu sedimenata i određivanje koncentracije hlorofila, a kao i analizu trofičnog statusa. Uzorci su sakupljeni sa osamnaest lokaliteta, raspoređenih duž obale u litoralu i iz dubljih zona jezera. U okviru faune dna, zabeleženo je devet faunističkih grupa sa ukupno dvadeset taksona. Procenjivan je kvalitet vode Srebrnog jezera sa stanoviÅ”ta trofije i saprobnosti. Stupanj trofije Srebrnog jezera je u oblasti gornje granice mezo- na prelazu u eutrofiju i u granicama eutrofnog statusa. Izračunate vrednosti saprobnog indeksa S po metodi Pantle-Bucka, primenom saprobnog sistema bioindikatorskih vrsta makrozoobentosa, bile su u opsegu od S=2,81 do S=3,60. Procenjeni kvalitet vode bio je u granicama III i na prelazu IV-III klasu.nul
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