USPOREDBA DVIJU BIOLOŠKIH METODA ZA OCJENU KAKVOĆE TEKUĆIH VODA NA TEMELJU ANALIZE ZAJEDNICE MAKROZOOBENTOSA

In the present paper, the results of two macrozoobenthos analysis based indices (Saprobic Index and Extended Biotic Index) are used as biological indicators in the assessment of river water quality. The objective of the paper is to establish the extent to which the results of these methods are comparable. The results indicate that both indices are suitable for assessing the quality of river water in the Croatian hydrographic network. Major deviations were only detected in xenosaprobic waters, i.e. at the springs of the Krka River and Crna rijeka, where the values of the Extended Biotic Index indicated poorer water quality.Na temelju analize zajednice makrozoobentosa, u radu su prikazani rezultati dvaju indeksa (indeksa saprobnosti i proširenoga biotičkog indeksa) koji se koriste kao biološki pokazatelji u procjeni kakvoće voda tekućica. Cilj je rada bio utvrditi u kojoj su mjeri međusobno usporedivi rezultati dobiveni primjenom dvaju navedenih indeksa. Rezultati pokazuju da su oba indeksa pogodna za procjenu kakvoće tekućica hidrografske mreže Hrvatske. Veća su odstupanja utvrđena samo u ksenosaprobnim vodama, tj. na izvorima Krke i Crne rijeke, gdje su vrijednosti proširenoga biotičkog indeksa uglavnom upućivale na lošiju kakvoću vode

USPOREDBA DVIJU BIOLOŠKIH METODA ZA OCJENU KAKVOĆE TEKUĆIH VODA NA TEMELJU ANALIZE ZAJEDNICE MAKROZOOBENTOSA

In the present paper, the results of two macrozoobenthos analysis based indices (Saprobic Index and Extended Biotic Index) are used as biological indicators in the assessment of river water quality. The objective of the paper is to establish the extent to which the results of these methods are comparable. The results indicate that both indices are suitable for assessing the quality of river water in the Croatian hydrographic network. Major deviations were only detected in xenosaprobic waters, i.e. at the springs of the Krka River and Crna rijeka, where the values of the Extended Biotic Index indicated poorer water quality.Na temelju analize zajednice makrozoobentosa, u radu su prikazani rezultati dvaju indeksa (indeksa saprobnosti i proširenoga biotičkog indeksa) koji se koriste kao biološki pokazatelji u procjeni kakvoće voda tekućica. Cilj je rada bio utvrditi u kojoj su mjeri međusobno usporedivi rezultati dobiveni primjenom dvaju navedenih indeksa. Rezultati pokazuju da su oba indeksa pogodna za procjenu kakvoće tekućica hidrografske mreže Hrvatske. Veća su odstupanja utvrđena samo u ksenosaprobnim vodama, tj. na izvorima Krke i Crne rijeke, gdje su vrijednosti proširenoga biotičkog indeksa uglavnom upućivale na lošiju kakvoću vode

Fauna vodenih muha plesačica (Diptera, Empididae: Hemerodromiinae i Clinocerinae) Nacionalnog parka Plitvička jezera

Adult aquatic dance flies were collected in the Plitvice Lakes National Park from 2005 to 2009 using various sampling methods. Sampling was done at 13 sampling sites representing four main types of karst aquatic habitats: spring, stream, tufa barriers and lakes. A total of 22 species were recorded belonging to 6 genera. Four species (Chelifera pyrenaica Vaillant, 1981; Hemerodromia laudatoria Collin, 1927; Clinocera wesmaeli (Macquart, 1835); Wiedemannia (Philolutra) aquilex (Loew, 1869)) are new to Croatian fauna. The highest species richness was recorded for the Bijela rijeka Spring. The cluster analysis showed that sites group together not just by similarity of community composition but as well in similarity of habitat types. Clustering of geographically nearby sites is also observed. This study represents an important contribution to the knowledge of dance flies fauna of Croatia and of various karstic habitats in general.Vodene muhe plesačice su sakupljane raznim metodama na području Nacionalnog parka Plitvička jezera u razdoblju od 2005. do 2009. godine. Uzorci su sakupljani na 13 lokacija na četiri osnovna tipa krških staništa: izvor, potok, sedrena barijera i jezero. Ukupno su zabilježene 22 vrste iz 6 rodova. Četiri vrste predstavljaju nove nalaze za faunu Hrvatske (Chelifera pyrenaica Vaillant, 1981; Hemerodromia laudatoria Collin, 1927; Clinocera wesmaeli (Macquart, 1835); Wiedemannia (Philolutra) aquilex (Loew, 1869)). Najveći broj vrsta zabilježen je na lokaciji Izvor Bijele rijeke. Klaster analizom je utvrđeno da se istraživane lokacije grupiraju po sličnosti sastava zajednice, ali i po sličnosti tipova staništa, također je utvrđeno grupiranje geografski bliskih lokacija. Ovo istraživanje pridonijet će boljem poznavanju faune vodenih muha plesačica Hrvatske, ali i različitih krških staništa općenito

What is new in Croatian mayfly fauna?

Here we present a first record of Baetis vardarensis Ikonomov, 1962 in Croatian freshwater habitats. The species was collected in February and March 2020 at two sites in the Sava River. With this record, Croatian mayfly species richness increased to a total of 85 species. In addition, one of the species previously known only from literature, Kageronia fuscogrisea (Retzius, 1783), was confirmed in Croatia. The species was collected in the Rečica River, in March 2020. These results confirm that our knowledge about mayfly fauna in different regions of Balkan Peninsula is still incomplete and is increasing with systematic studies

Prvi nalaz vrste Nubensia nubens (Edwards, 1929) (Diptera: Chironomidae) u Hrvatskoj

The species Nubensia nubens (Edwards, 1929) from the dipteran family Chironomidae has been recorded for the first time in Croatian chironomid fauna. It was found in the littoral of the oligotrophic Lake Vrana on the island of Cres. The species is known from Italy, Albania and the Republic of Northern Macedonia as well as western Europe, the Czech Republic and the Pyrenees. Lake Vrana is currently the only known habitat of this species in Croatia.Vrsta Nubensia nubens (Edwards, 1929) koja pripada porodici Chironomidae zabilježena je po prvi puta u fauni Hrvatske. Pronađena je u litoralu Vranskog jezera na otoku Cresu. Ova vrsta je poznata u fauni Italije, Albanije te Republike Sjeverne Makedonije, kao i s područja zapadne Europe, Češke i Pirineja. Vransko jezero na otoku Cresu zasad je jedino poznato stanište ove vrste u Hrvatskoj

Mayflies of the Bednja River, Croatia

Here we present the results of a mayfly study conducted on a hydromorphologically altered lowland river in Croatia, the Bednja River. Twenty-two mayfly species were recorded, Baetis fuscatus (Linnaeus, 1761) and Serratella ignita (Poda, 1761) being the most widespread and Paraleptophlebia submarginata (Stephens, 1836) and Cloeon dipterum (Linnaeus, 1761) the rarest species. A significant increase in mayfly species richness was observed along the river course. Nevertheless, cluster analysis showed that their assemblages were not grouped according to the study position along the Bednja River. The lowest species richness and diversity were recorded for the spring area. Surprisingly, the highest species richness was found at a site with moderate hydromorphological alterations, and the highest diversity at a site with severe hydromorphological alterations. This could be because the river is connected to numerous lateral streams and a variety of microhabitats are available. New distribution records in Croatia are presented for some rare species in Croatian freshwater habitats, such as Heptagenia longicauda (Stephens, 1836). Ephemera lineata Eaton, 1870 was recorded for the first time in the Pannonian lowland ecoregion (ER 11) in Croatia. Caenis cf. pseudorivulorum Keffermüller, 1960 has not yet been recorded in Croatian freshwater habitats, but since our identifications are based on juvenile specimens, its occurrence is still to be confirmed

COMPARISON OF TWO BIOLOGICAL METHODS FOR ASSESSMENT OF RIVER WATER QUALITY BASED ON MACROZOOBENTHOS

In the present paper, the results of two macrozoobenthos analysis based indices (Saprobic Index and Extended Biotic Index) are used as biological indicators in the assessment of river water quality. The objective of the paper is to establish the extent to which the results of these methods are comparable. The results indicate that both indices are suitable for assessing the quality of river water in the Croatian hydrographic network. Major deviations were only detected in xenosaprobic waters, i.e. at the springs of the Krka River and Crna rijeka, where the values of the Extended Biotic Index indicated poorer water quality

Vodene muhe plesačice (Diptera, Empididae: Hemerodromiinae i Clinocerinae) Crne Gore

Adult aquatic dance flies (Empididae) were collected during July 2012 and July 2013 in Montenegro using sweep nets and by aspirator at 21 sampling sites. From 25 species recorded in this study, 22 species are new to the fauna of Montenegro: Chelifera pyrenaica Vaillant, Hemerodromia laudatoria Collin, Clinocera stagnalis (Haliday), Clinocera wesmaeli (Macquart), Clinocerella sorex (Engel), Dolichocephala guttata (Haliday), Kowarzia barbatula Mik, Kowarzia plectrum Mik, Roederiodes macedonicus Wagner & Horvat, Wiedemannia (Chamaedipsia) longicornis (Mik), Wiedemannia (Eucelidia) zetterstedti (Fallén), Wiedemannia (Philolutra) angelieri Vaillant, Wiedemannia (Philolutra) aquilex (Loew), Wiedemannia (Philolutra) fallaciosa (Loew), Wiedemannia (Philolutra) hygrobia (Loew), Wiedemannia (Philolutra) kacanskae Horvat, Wiedemannia (Philolutra) queyrasiana Vaillant, Wiedemannia (Pseudowiedemannia) microstigma Bezzi, Wiedemannia (Wiedemannia) andreevi Joost, Wiedemannia (Wiedemannia) balkanica Wagner, Wiedemannia (Wiedemannia) stylifera Mik and Wiedemannia artemisa Ivković & Plant. In total 34 species were recorded belonging to 9 genera. This study represents an important contribution to the knowledge of dance flies fauna of Montenegro and it is important reference for the distribution of Empididae on Balkan Peninsula.Vodene muhe plesačice su sakupljane entomološkom mrežicom i aspiratorom tijekom srpnja 2012. i srpnja 2013. godine. Uzorkovanje je provedeno na 21 lokaciji. Od 25 vrsta sakupljenih u ovom istraživanju, 22 vrste predstavljaju nove nalaze za faunu Crne Gore: Chelifera pyrenaica Vaillant, Hemerodromia laudatoria Collin, Clinocera stagnalis (Haliday), Clinocera wesmaeli (Macquart), Clinocerella sorex (Engel), Dolichocephala guttata (Haliday), Kowarzia barbatula Mik, Kowarzia plectrum Mik, Roederiodes macedonicus Wagner & Horvat, Wiedemannia (Chamaedipsia) longicornis (Mik), Wiedemannia (Eucelidia) zetterstedti (Fallén), Wiedemannia (Philolutra) angelieri Vaillant, Wiedemannia (Philolutra) aquilex (Loew), Wiedemannia (Philolutra) fallaciosa (Loew), Wiedemannia (Philolutra) hygrobia (Loew), Wiedemannia (Philolutra) kacanskae Horvat, Wiedemannia (Philolutra) queyrasiana Vaillant, Wiedemannia (Pseudowiedemannia) microstigma Bezzi, Wiedemannia (Wiedemannia) andreevi Joost, Wiedemannia (Wiedemannia) balkanica Wagner, Wiedemannia (Wiedemannia) stylifera Mik and Wiedemannia artemisa Ivković & Plant. Do sada su zabilježene 34 vrste iz 9 rodova. Ovo istraživanje pridonijet će boljem poznavanju faune vodenih muha plesačica Crne Gore, ali i poznavanju njihove rasprostranjenosti na Balkanskom poluotoku

Novi nalaz razmnožavanja vrste Lindenia tetraphylla (Vander Linden, 1825) (Odonata, Gomphidae) na sjeverozapadnoj granici njene rasprostranjenosti

A total of 12 dragonfly species were recorded at Vlačine Reservoir in the Dinaric Western Balkan region (ER 5) in Croatia. Habitat conditions, i.e. vegetation structure and physico-chemical water properties of the reservoir, are presented and discussed. Habitat conditions were suitable for life cycle completion of Mediterranean species such as Lindenia tetraphylla and Selysiothemis nigra. Exuviae of L. tetraphylla represent new evidence of the species’ reproduction in the north-western border of its distribution.Na akumulaciji Vlačine, smještenoj u dinaridskoj ekoregiji (ER 5, Dinaridski zapadni Balkan) u Hrvatskoj, zabilježeno je ukupno 12 vrsta vretenaca. U radu su prikazani i raspravljeni okolišni uvjeti na istraživanom staništu, prvenstveno struktura vegetacije i fizikalno-kemijski čimbenici vode. Stanišni uvjeti akumulacije bili su pogodni za uspješno završavanje životnog ciklusa mediteranskih vretenaca poput vrsta Lindenia tetraphylla i Selysiothemis nigra. Zabilježeni svlakovi vrste L. tetraphylla predstavljaju novi nalaz razmnožavanja ove vrste na sjeverozapadnoj granici njene rasprostranjenosti

Pregled istraživanja i novi nalazi rasprostranjenosti alohtonog maločetinaša Branchiura sowerbyi u Hrvatskoj

The freshwater oligochaete Branchiura sowerbyi is indigenous to southeast Asia, but can be found inhabiting most of Europe. This tubificid was even described for the first time outside of its natural area of occurrence: in the garden of the Royal Botanic Society in London. It has spread over all continents except Antarctica, and in Europe it has been found in 23 countries. The presence of this non-native species may affect other species\u27 relationships in the benthic community and thus have substantial effects on food webs of aquatic ecosystems. Our goal was to present the first comprehensive overview of the distribution of this potentially invasive species in Croatia as a basis for the future monitoring of the species distribution. In Croatia, B. sowerbyi was found for the first time in 1954 in Varaždin’s thermal stream and the following year in the lake of the Botanical garden, Faculty of Science, University of Zagreb. To date, B. sowerbyi individuals were found on 64 different sites in Croatia, mostly occupying the Pannonian Lowland Ecoregion (ER 11) with only two findings in the Dinaric Western Balkan Ecoregion (ER 5).Prirodni areal rasprostiranja vrste Branchiura sowerbyi je jugoistočna Azija, no ovaj se maločetinaš može pronaći u slatkovodnim ekosustavima diljem Europe. Čak je i prvi opis ove vrste tubificida bio izvan njegovog prirodnog areala rasprostiranja, točnije u botaničkom vrtu „Royal Botanic Society“ u Londonu. Ova vrsta danas je prisutna na svim kontinentima osim Antartike, a u Europi je zabilježena u 23 zemlje. Prisustvo ove alohtone vrste može imati još neutvrđene implikacije na zajednice slatkovodnih makroskopskih beskralježnjaka, kao i na funkcioniranje hranidbenih mreža unutar ovih zajednica. Cilj ovog rada bio je izraditi sveobuhvatan pregled distribucije ove vrste na području Hrvatske kao bazu za buduće nadziranje širenja te vrste. U Hrvatskoj je vrsta B. sowerbyi nađena prvi put 1954. godine u termalnom potoku u Varaždinu, a već sljedeće godine pronađena je u Botaničkom vrtu Sveučilišta u Zagrebu. Dosad je vrsta zabilježena na 64 različite lokacije na području Hrvatske, većinom u Panonskoj ekoregiji (ER 11), dok je u Dinaridskoj ekoregiji (ER 5) dosad zabilježena na samo dvije lokacije