Az Ipoly magyarországi szakaszának hosszúidejű halfauna változását a 19. századtól megjelent half... more Az Ipoly magyarországi szakaszának hosszúidejű halfauna változását a 19. századtól megjelent halfaunisztikai publikációk és közvetlen halbiológiai felméréseink alapján jellemeztük. A vizsgált alsó folyószakaszon 56 halfaj előfordulása igazolható. Áttekintést adtunk a folyó antropogén hatásokkal összefüggő változásairól, valamint meghatároztuk a folyó natív halfaunáját és adventív faunaelemeit. A halfauna térbeli eloszlását és összetételének alakulását folyószabályozási beavatkozásokkal összefüggően ismertettük.
A középkorban a tokfélék meghatározó szerepet játszottak a magyar halászat történetében, de a túl... more A középkorban a tokfélék meghatározó szerepet játszottak a magyar halászat történetében, de a túlhalászat, majd a kiterjedt folyószabályozások és az élőhelyek változása következtében a dunai populációik fokozatosan megfogyatkoztak, és a 20. század végére az öt természetes honos fajból kettő gyakorlatilag eltűnt a Kárpát-medencéből. A magyarországi Duna-szakaszon előforduló tokfélék populációnak változásait és természetvédelmi státuszukat meghatározó fontosabb tényezőket, a védelmükre irányuló nemzetközi törekvésekhez kapcsolódóan értékeltük. Napjainkban már csak a kecsege (Acipenser ruthenus) az egyetlen halászható tokféle a Közép-Duna térségében. A halászok több évtizedes kecsegefogási adatsorait elemezve kimutattuk, hogy a fogások ingadozása mérsékelt összefüggést mutat a Duna vízjárásának változásával. A dunai kecsegeállomány utánpótlására vonatkozó becslések azt igazolták, hogy a mesterséges nevelt ivadék kihelyezéseknek nincs számottevő hatása a természetes populációk mennyiség...
A Duna Budapest feletti szakaszán, a Gödi-sziget térségében megkezdett halivadék-állomány felméré... more A Duna Budapest feletti szakaszán, a Gödi-sziget térségében megkezdett halivadék-állomány felmérések keretében, a part menti élőhelyi struktúrák tér- és időbeli változékonyságát vizsgáltuk 2008. márciustól szeptemberig. Pont abundancia mintavételi stratégiát alkalmazva, összesen 10 élőhelyi mutató mérési adatai alapján jellemeztük a tanulmányozott partszakaszokat. A vizsgálatok kezdeti eredményei alapján kimutatható volt, hogy a természetes jellegű partok mentén a vízállás emelkedésével egyre határozottabban érvényesül a bedőlt fák és a szárazföldi növényzet hatása. A kőszórással védett, mesterséges partszakaszok élőhelyi sajátosságait a vízállás ingadozása kevésbé befolyásolta
Kivonat Az invazív idegen fajok (IAS) egyre nagyobb veszélyt jelentenek a Duna vízrendszerének bi... more Kivonat Az invazív idegen fajok (IAS) egyre nagyobb veszélyt jelentenek a Duna vízrendszerének biológiai sokféleségre. Az EU Duna Régió Stratégia keretében egy nemzetközi szakértői munkacsoport alakult 2014ben a dunai invazív fajok terjedésével kapcsolatban felmerülő feladatok koordinálására. Az együttműködés célja egy olyan stratégia kidolgozása, amely hatékony eszközt biztosít az invazív fajokkal összefüggő regionális problémák megelőzésére és kezelésére, különös tekintettel a már létező európai és globális IAS hálózatok tapasztalataira. A Dunában előforduló idegen halfajok társadalmi megítélése sokrétű. A halak példáján keresztül mutatjuk be a kérdéskörrel kapcsolatos problémákat, feladatokat és a kezdeti eredményeket.
Zenodo (CERN European Organization for Nuclear Research), 2012
The River Danube, connected to the Rhine catchment via the Rhine-Main-Danube Canal, is part of a ... more The River Danube, connected to the Rhine catchment via the Rhine-Main-Danube Canal, is part of a significant aquatic invasion corridor in Europe between the North Sea and the Black Sea. Among its aquatic fauna molluscs, crustaceans and fishes represent the most prominent groups of invaders in terms of species number and biomass. The listed reptile species is in the list of the 100 worst invasive species in the world. This paper reviews available information about the arrival time, way of introduction, distribution area, dominance in communities, ecosystem functions, and impact on the native fauna along the Hungarian stretch of the Danube of 43 non-indigenous species having arrived from several continents as Africa, Asia, Europe, North America, or New Zealand. Transport vectors that contribute to the introduction and the rapid spread of alien species are river shipping, deliberate crayfish and fish stocking, pet trade, release from aquaria, and food consumption. The invasions of the studied species have a potential to alter the structure and the function of Danubian ecosystems and create new biodiversity and economic problems. Due to the international importance of the River Danube, efforts should be made to prevent new invasions and manage the existing invaders along the whole river.
The Szigetkoz floodplain is located along the Hungarian side of the lower Alpine foothills zone o... more The Szigetkoz floodplain is located along the Hungarian side of the lower Alpine foothills zone of the Danube, from Bratislava to Gonyű. During the last decades, it has been monitored with particular intensity, because of the impacts of the operation of the Gabcikovo hydropower station. The study describes the natural system, the functioning of an ecosystem before human intervention, and provides a historical review concerning river regulations and land use, as well as the modification of hydrological and geo-morphological processes resulting in deprived habitat conditions and the alteration of the river-floodplain ecosystem.
Sturgeons had played an important role in the history of Hungarian fisheries, but due to over-fis... more Sturgeons had played an important role in the history of Hungarian fisheries, but due to over-fishing, followed by extensive river regulations and deterioration of habitats, there has been a considerable decrease in populations which are now on the verge of extinction. Sterlet (Acipenser ruthenus) is only a common species caught for commercial and recreational purposes. The main factors of sterlet population dynamics were evaluated according to the new international efforts for sturgeon con- servation. A moderate correlation was confirmed between the annual sterlet catches and the fluctuation of the hydrological regime of the Danube. Assessment of restocking activity and population recruitment demonstrated low efficiency of remedial measures for the Danubian sterlet.
This Final Report contains an overview of the scientifi c fi ndings of the Joint Danube Survey 2 ... more This Final Report contains an overview of the scientifi c fi ndings of the Joint Danube Survey 2 (JDS2). For most chapters, more detailed information can be found on the attached CD-ROM, where full versions of the scientifi c papers are presented. Map showing all JDS2 sampling sites is at the end of the report. The authors wish to thank all those who supported and assisted in carrying out the JDS2, including the national delegations to the ICPDR, the Core Team, national teams and laboratories, as well as supporters from the private sector. Their support was crucial in carrying out the JDS2.
Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen, 2002
The Danube is Central Europe's largest river and its middle section flows across the Carpathi... more The Danube is Central Europe's largest river and its middle section flows across the Carpathian Basin (Central European Plain). Where the river joins the plain, it deposits gravel carried from the Alps, and i t has formed an alluvial cone stretching from Bratislava to Gi:inyíí (r.lan 1870-1790) on the Hungarian-Slovak border. One of Europe's last extensive inundated flood plains is in this area. Its Hungarian side is known as the Szigetki:iz and the Slovak side is
Consideration of diurnal changes of fish distribution is a basic requirement in devel... more Consideration of diurnal changes of fish distribution is a basic requirement in development of sampling strategy for fish monitoring in large rivers. In present study, sampling results of day and night electrofishing were compared in two sections of the Danube (at Szob and Sződliget), and two tributaries (the Ipel river at Szob and the Sződrakosi stream at Sződliget). Samples contained 3895 individuals of 35 fish species in 2012. Some species (Romanogobio vladykovi, Zingel zingel, Sander volgensis, etc.) were observed only in night samples, furthermore species richness and abundance in the night samples was significantly higher than in the day samples in the Danube. Evaluation of diurnal variability in electrofishing catches, can contribute to development of standard fish sampling methods in large rivers. | A folyami halallomanyok reprezentativ felmereset elősegitő mintaveteli strategia kidolgozasakor fontos kerdes a halak eloszl...
Fish are good indicators of long-term changes of fluvial ecosystems therefore, assessment of fish... more Fish are good indicators of long-term changes of fluvial ecosystems therefore, assessment of fish assemblages is frequently used in evaluation of the ecological status of surface waters, especially since the implementation of the EU Water Framework Directive. Long-term changes of fish fauna and old-time abundance of fish populations in the Danube can be documented by historical data of fisheries. Direct detection of long-term changes of fish populations in large rivers is a difficult task due to large-scale temporal and spatial variability of fish distribution. The present study provides a review of river fish sampling methods, with special attention to approaches based on electrofishing. Our goal is to develop a standard monitoring method in large rivers to get more reliable and consistent data for description of long-term changes of fish populations.
Sturgeons had played an important role in the history of Hungarian fisheries, but over-fishing, f... more Sturgeons had played an important role in the history of Hungarian fisheries, but over-fishing, followed by extensive river regulations and deterioration of habitat quality have caused a decrease in populations to the verge of extinction in the middle Danube and its tributaries. Stellate sturgeon (Acipenser stellatus) and great sturgeon (Huso huso) are practically vanished from the Hungarian waters and Russian sturgeon (A. gueldenstaedti) and ship sturgeon (A. nudiventris) have sporadic occurrence only, while Atlantic sturgeon (A. sturio) was never resident of this stretch of the Danube River. Sterlet (A. ruthenus) is the only common species caught for commercial and recreational purposes. The paper describes the past and recent status of the Middle Danubian sturgeon populations and emphasizes problems of restricted availability or lack of essential spawning and nursery habitats. Impacts of floods on sterlet population dynamics are demonstrated by long-term data of commercial fishery. Existing conservation measures, restocking and fishing regulations in Hungary are evaluated.
Description of the fish fauna was completed by way of literary review, field experience, and some... more Description of the fish fauna was completed by way of literary review, field experience, and some rare species have been found in the catches of commercial fishermen. Suitable publications and reports are available from the 18 th century. The upper part of the Slovak-Hungarian section of the Danube is aggrading and anabranching, while its lower part is a wandering sinuous channel. The native fish fauna includes 54 species, while the alien fish fauna contains 23 species, 11 of which are exotic in Europe. Two species, Huso huso and Acipenser stellatus are practically extinct from the Middle Danube region. This river stretch is heavily modified, and the historical changes of the fish fauna were evaluated in conjunction with human impacts.
Transylvanian Review of Systematical and Ecological Research, 2014
An important fisheries sector of the Danube, the “Iron Gates” area, was studied by famous natural... more An important fisheries sector of the Danube, the “Iron Gates” area, was studied by famous naturalists along the history like Marsigli, Haeckel, Kner, Antipa and Bănărescu. After more than half a century after the last main publication in this area, the “Iron Gates” Danube sector suffered significant human impact, and an assessment of the fish fauna was needed. The paper summarizes the trend of fish species along the XIX to XXIst centuries, and reveals the appearance of new species. The study includes data from about 65 fish species, belonging to: Acipenseridae, Polyodontidae, Clupeidae, Salmonidae, Esocidae, Cyprinidae, Cobitidae, Siluridae, Ictaluridae, Anguillidae, Lotidae, Gasterosteidae, Syngnathidae, Centrarchidae, Percidae, Gobiidae, Odontobutidae, and Cottidae. The major hidrotechnical works along with pollution, overexploitation and poachery, induced major changes in the ichthyofauna structure.
Az Ipoly magyarországi szakaszának hosszúidejű halfauna változását a 19. századtól megjelent half... more Az Ipoly magyarországi szakaszának hosszúidejű halfauna változását a 19. századtól megjelent halfaunisztikai publikációk és közvetlen halbiológiai felméréseink alapján jellemeztük. A vizsgált alsó folyószakaszon 56 halfaj előfordulása igazolható. Áttekintést adtunk a folyó antropogén hatásokkal összefüggő változásairól, valamint meghatároztuk a folyó natív halfaunáját és adventív faunaelemeit. A halfauna térbeli eloszlását és összetételének alakulását folyószabályozási beavatkozásokkal összefüggően ismertettük.
A középkorban a tokfélék meghatározó szerepet játszottak a magyar halászat történetében, de a túl... more A középkorban a tokfélék meghatározó szerepet játszottak a magyar halászat történetében, de a túlhalászat, majd a kiterjedt folyószabályozások és az élőhelyek változása következtében a dunai populációik fokozatosan megfogyatkoztak, és a 20. század végére az öt természetes honos fajból kettő gyakorlatilag eltűnt a Kárpát-medencéből. A magyarországi Duna-szakaszon előforduló tokfélék populációnak változásait és természetvédelmi státuszukat meghatározó fontosabb tényezőket, a védelmükre irányuló nemzetközi törekvésekhez kapcsolódóan értékeltük. Napjainkban már csak a kecsege (Acipenser ruthenus) az egyetlen halászható tokféle a Közép-Duna térségében. A halászok több évtizedes kecsegefogási adatsorait elemezve kimutattuk, hogy a fogások ingadozása mérsékelt összefüggést mutat a Duna vízjárásának változásával. A dunai kecsegeállomány utánpótlására vonatkozó becslések azt igazolták, hogy a mesterséges nevelt ivadék kihelyezéseknek nincs számottevő hatása a természetes populációk mennyiség...
A Duna Budapest feletti szakaszán, a Gödi-sziget térségében megkezdett halivadék-állomány felméré... more A Duna Budapest feletti szakaszán, a Gödi-sziget térségében megkezdett halivadék-állomány felmérések keretében, a part menti élőhelyi struktúrák tér- és időbeli változékonyságát vizsgáltuk 2008. márciustól szeptemberig. Pont abundancia mintavételi stratégiát alkalmazva, összesen 10 élőhelyi mutató mérési adatai alapján jellemeztük a tanulmányozott partszakaszokat. A vizsgálatok kezdeti eredményei alapján kimutatható volt, hogy a természetes jellegű partok mentén a vízállás emelkedésével egyre határozottabban érvényesül a bedőlt fák és a szárazföldi növényzet hatása. A kőszórással védett, mesterséges partszakaszok élőhelyi sajátosságait a vízállás ingadozása kevésbé befolyásolta
Kivonat Az invazív idegen fajok (IAS) egyre nagyobb veszélyt jelentenek a Duna vízrendszerének bi... more Kivonat Az invazív idegen fajok (IAS) egyre nagyobb veszélyt jelentenek a Duna vízrendszerének biológiai sokféleségre. Az EU Duna Régió Stratégia keretében egy nemzetközi szakértői munkacsoport alakult 2014ben a dunai invazív fajok terjedésével kapcsolatban felmerülő feladatok koordinálására. Az együttműködés célja egy olyan stratégia kidolgozása, amely hatékony eszközt biztosít az invazív fajokkal összefüggő regionális problémák megelőzésére és kezelésére, különös tekintettel a már létező európai és globális IAS hálózatok tapasztalataira. A Dunában előforduló idegen halfajok társadalmi megítélése sokrétű. A halak példáján keresztül mutatjuk be a kérdéskörrel kapcsolatos problémákat, feladatokat és a kezdeti eredményeket.
Zenodo (CERN European Organization for Nuclear Research), 2012
The River Danube, connected to the Rhine catchment via the Rhine-Main-Danube Canal, is part of a ... more The River Danube, connected to the Rhine catchment via the Rhine-Main-Danube Canal, is part of a significant aquatic invasion corridor in Europe between the North Sea and the Black Sea. Among its aquatic fauna molluscs, crustaceans and fishes represent the most prominent groups of invaders in terms of species number and biomass. The listed reptile species is in the list of the 100 worst invasive species in the world. This paper reviews available information about the arrival time, way of introduction, distribution area, dominance in communities, ecosystem functions, and impact on the native fauna along the Hungarian stretch of the Danube of 43 non-indigenous species having arrived from several continents as Africa, Asia, Europe, North America, or New Zealand. Transport vectors that contribute to the introduction and the rapid spread of alien species are river shipping, deliberate crayfish and fish stocking, pet trade, release from aquaria, and food consumption. The invasions of the studied species have a potential to alter the structure and the function of Danubian ecosystems and create new biodiversity and economic problems. Due to the international importance of the River Danube, efforts should be made to prevent new invasions and manage the existing invaders along the whole river.
The Szigetkoz floodplain is located along the Hungarian side of the lower Alpine foothills zone o... more The Szigetkoz floodplain is located along the Hungarian side of the lower Alpine foothills zone of the Danube, from Bratislava to Gonyű. During the last decades, it has been monitored with particular intensity, because of the impacts of the operation of the Gabcikovo hydropower station. The study describes the natural system, the functioning of an ecosystem before human intervention, and provides a historical review concerning river regulations and land use, as well as the modification of hydrological and geo-morphological processes resulting in deprived habitat conditions and the alteration of the river-floodplain ecosystem.
Sturgeons had played an important role in the history of Hungarian fisheries, but due to over-fis... more Sturgeons had played an important role in the history of Hungarian fisheries, but due to over-fishing, followed by extensive river regulations and deterioration of habitats, there has been a considerable decrease in populations which are now on the verge of extinction. Sterlet (Acipenser ruthenus) is only a common species caught for commercial and recreational purposes. The main factors of sterlet population dynamics were evaluated according to the new international efforts for sturgeon con- servation. A moderate correlation was confirmed between the annual sterlet catches and the fluctuation of the hydrological regime of the Danube. Assessment of restocking activity and population recruitment demonstrated low efficiency of remedial measures for the Danubian sterlet.
This Final Report contains an overview of the scientifi c fi ndings of the Joint Danube Survey 2 ... more This Final Report contains an overview of the scientifi c fi ndings of the Joint Danube Survey 2 (JDS2). For most chapters, more detailed information can be found on the attached CD-ROM, where full versions of the scientifi c papers are presented. Map showing all JDS2 sampling sites is at the end of the report. The authors wish to thank all those who supported and assisted in carrying out the JDS2, including the national delegations to the ICPDR, the Core Team, national teams and laboratories, as well as supporters from the private sector. Their support was crucial in carrying out the JDS2.
Internationale Vereinigung für theoretische und angewandte Limnologie: Verhandlungen, 2002
The Danube is Central Europe's largest river and its middle section flows across the Carpathi... more The Danube is Central Europe's largest river and its middle section flows across the Carpathian Basin (Central European Plain). Where the river joins the plain, it deposits gravel carried from the Alps, and i t has formed an alluvial cone stretching from Bratislava to Gi:inyíí (r.lan 1870-1790) on the Hungarian-Slovak border. One of Europe's last extensive inundated flood plains is in this area. Its Hungarian side is known as the Szigetki:iz and the Slovak side is
Consideration of diurnal changes of fish distribution is a basic requirement in devel... more Consideration of diurnal changes of fish distribution is a basic requirement in development of sampling strategy for fish monitoring in large rivers. In present study, sampling results of day and night electrofishing were compared in two sections of the Danube (at Szob and Sződliget), and two tributaries (the Ipel river at Szob and the Sződrakosi stream at Sződliget). Samples contained 3895 individuals of 35 fish species in 2012. Some species (Romanogobio vladykovi, Zingel zingel, Sander volgensis, etc.) were observed only in night samples, furthermore species richness and abundance in the night samples was significantly higher than in the day samples in the Danube. Evaluation of diurnal variability in electrofishing catches, can contribute to development of standard fish sampling methods in large rivers. | A folyami halallomanyok reprezentativ felmereset elősegitő mintaveteli strategia kidolgozasakor fontos kerdes a halak eloszl...
Fish are good indicators of long-term changes of fluvial ecosystems therefore, assessment of fish... more Fish are good indicators of long-term changes of fluvial ecosystems therefore, assessment of fish assemblages is frequently used in evaluation of the ecological status of surface waters, especially since the implementation of the EU Water Framework Directive. Long-term changes of fish fauna and old-time abundance of fish populations in the Danube can be documented by historical data of fisheries. Direct detection of long-term changes of fish populations in large rivers is a difficult task due to large-scale temporal and spatial variability of fish distribution. The present study provides a review of river fish sampling methods, with special attention to approaches based on electrofishing. Our goal is to develop a standard monitoring method in large rivers to get more reliable and consistent data for description of long-term changes of fish populations.
Sturgeons had played an important role in the history of Hungarian fisheries, but over-fishing, f... more Sturgeons had played an important role in the history of Hungarian fisheries, but over-fishing, followed by extensive river regulations and deterioration of habitat quality have caused a decrease in populations to the verge of extinction in the middle Danube and its tributaries. Stellate sturgeon (Acipenser stellatus) and great sturgeon (Huso huso) are practically vanished from the Hungarian waters and Russian sturgeon (A. gueldenstaedti) and ship sturgeon (A. nudiventris) have sporadic occurrence only, while Atlantic sturgeon (A. sturio) was never resident of this stretch of the Danube River. Sterlet (A. ruthenus) is the only common species caught for commercial and recreational purposes. The paper describes the past and recent status of the Middle Danubian sturgeon populations and emphasizes problems of restricted availability or lack of essential spawning and nursery habitats. Impacts of floods on sterlet population dynamics are demonstrated by long-term data of commercial fishery. Existing conservation measures, restocking and fishing regulations in Hungary are evaluated.
Description of the fish fauna was completed by way of literary review, field experience, and some... more Description of the fish fauna was completed by way of literary review, field experience, and some rare species have been found in the catches of commercial fishermen. Suitable publications and reports are available from the 18 th century. The upper part of the Slovak-Hungarian section of the Danube is aggrading and anabranching, while its lower part is a wandering sinuous channel. The native fish fauna includes 54 species, while the alien fish fauna contains 23 species, 11 of which are exotic in Europe. Two species, Huso huso and Acipenser stellatus are practically extinct from the Middle Danube region. This river stretch is heavily modified, and the historical changes of the fish fauna were evaluated in conjunction with human impacts.
Transylvanian Review of Systematical and Ecological Research, 2014
An important fisheries sector of the Danube, the “Iron Gates” area, was studied by famous natural... more An important fisheries sector of the Danube, the “Iron Gates” area, was studied by famous naturalists along the history like Marsigli, Haeckel, Kner, Antipa and Bănărescu. After more than half a century after the last main publication in this area, the “Iron Gates” Danube sector suffered significant human impact, and an assessment of the fish fauna was needed. The paper summarizes the trend of fish species along the XIX to XXIst centuries, and reveals the appearance of new species. The study includes data from about 65 fish species, belonging to: Acipenseridae, Polyodontidae, Clupeidae, Salmonidae, Esocidae, Cyprinidae, Cobitidae, Siluridae, Ictaluridae, Anguillidae, Lotidae, Gasterosteidae, Syngnathidae, Centrarchidae, Percidae, Gobiidae, Odontobutidae, and Cottidae. The major hidrotechnical works along with pollution, overexploitation and poachery, induced major changes in the ichthyofauna structure.
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Papers by Gábor Guti