Updating water quality targets for shallow Lake Balaton (Hungary), recovering from eutrophication

Istvánovics, Vera; Clement, Adrienne; Somlyódy, L.; Specziár, András; Tóth, László; Padisák, Judit

doi:10.1007/s10750-006-0509-1

Cited by 88 publications

(26 citation statements)

References 24 publications

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“…In Lake Balaton, there are characteristic gradients of trophic state (Istvánovics et al ., ), food resource density and composition (Specziár & Vörös, ; Istvánovics et al ., ) and water depth (Herodek et al ., ) from basin I towards basin IV, which significantly affect fish assemblage composition and stock density (Bíró, ; Tátrai et al ., ; Specziár, ). Present results show, however, that this component explains on average <20% of the total variance in gillnet samples, except for lake level variability in the CPUE of A. aspius and C. carpio .…”

Section: Discussionmentioning

confidence: 99%

“…Lake Balaton is the largest shallow lake (surface area: 593 km 2 ; mean depth: 3·2 m) in central Europe, situated at 46° 42′–47° 04′ N; 17° 15′–18° 10′ E and 104·8 m above sea level. The lake is meso‐eutrophic with mean annual chlorophyll‐ a concentrations of 3·6–18·7 mg m −3 (Istvánovics et al ., ). Forty‐seven per cent of the lakeshore is covered by reed grass Phragmites australis , but submerged macrophytes occur sparsely in the littoral zone.…”

Section: Methodsmentioning

confidence: 99%

“…Explanatory variables considered in the analyses were: (1) lake basin [four lake basins representing a trophic gradient; Istvánovics et al . ()], (2) horizontally structured habitat type (offshore, littoral north and littoral south), (3) sampled water layer (BG, SG), (4) year of sampling (2005–2010), (5) season of sampling (spring, summer and autumn), (6) water depth, (7) Secchi disc depth and (8) water temperature. Explanatory variables were classed in three main groups as follows: (1) space (lake basin, habitat and water layer), (2) time (year and season) and (3) environment (water depth, Secchi disc depth and water temperature).…”

Section: Methodsmentioning

confidence: 99%

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Within‐lake distribution patterns of fish assemblages: the relative roles of spatial, temporal and random environmental factors in assessing fish assemblages using gillnets in a large and shallow temperate lake

Specziár

György

Erős

2013

Journal of Fish Biology

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Identifying components of variability in fish assemblage samples is important for 28 understanding the organization of assemblages, perform ecosystem health assessment and 29 design sampling strategy for monitoring programs. In this study, the relative role of spatio-30 temporal factors and associated environmental variables (water transparency and temperature) 31 was quantified in gillnet samples in a large and shallow lake (Lake Balaton, Hungary). The 32 majority of the variance (56.1%) in the relative abundance data (%) was related to the vertical 33 segregation of fish. This gradient substantially affected the number-per-unit-effort (NPUE) of 34 the dominant species, the surface-oriented bleak Alburnus alburnus and the benthic common 35bream Abramis brama, total NPUE, mean fish mass and species richness and diversity as 36 well. At the lake level, horizontal habitat heterogeneity (i.e. littoral vs. offshore) accounted for 37 only 8.3% of the total variance in relative abundance data, but was important in structuring 38 the NPUE of the ruffe Gymnocephalus cernua and the pikeperch Sander lucioperca. The 39 longitudinal environmental gradient (i.e. lake basin), year and season of the sampling, water 40 transparency and temperature proved to have significant effect on relative abundance only at 41 the habitat level, but were important component of variability of the NPUE in some species at 42 lake level too. Since sampling schemes should consider the main gradients in fish assemblage 43 distributions the use of surface and pelagic gillnets should be more intensively incorporated in 44 the study and monitoring of fish assemblages in shallow lakes and lake habitats. 45 46

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Within‐lake distribution patterns of fish assemblages: the relative roles of spatial, temporal and random environmental factors in assessing fish assemblages using gillnets in a large and shallow temperate lake

Specziár

György

Erős

2013

Journal of Fish Biology

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“…Lake Balaton is the largest (596 km 2 ) freshwater lake in central Europe, but has a mean depth of only 3.2 m (Istvánovics et al., ). It is c .…”

Section: Methodsmentioning

confidence: 99%

Endozoochory of aquatic ferns and angiosperms by mallards in Central Europe

et al. 2018

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Modern literature on plant dispersal by birds focuses mainly on the importance of frugivory and scatter‐hoarding, yet recent studies show that endozoochory by migratory waterbirds is an important mechanism of long‐distance dispersal for a broad range of plants. Nevertheless, there is a lack of empirical field studies that identify the plants dispersed by waterbirds in a comprehensive manner. In particular, so far there are no detailed studies of the level of spatial variation in the plant taxa dispersed by a waterbird vector, and no clear demonstration that aquatic ferns can be dispersed by endozoochory. Consequently, we remain ignorant of the networks of dispersal interactions between granivorous waterbirds and plants. Five sets of faecal samples (total n = 215) were collected from mallards Anas platyrhynchos on autumn migration in the Hevesi‐holm and Balaton regions in Hungary, central Europe. Intact diaspores were extracted, identified and their germinability assessed under standard conditions. The plant communities recorded at different sites were compared with PERMANOVA and other multivariate methods. Macrospores of the floating watermoss Salvinia natans were recorded in 32 samples, and a total of 16 macrospores germinated, providing the first field demonstration of endozoochory of ferns by birds. Of 21 angiosperm taxa recorded (of which eight germinated), 13 were terrestrial species, although the most abundant taxa were aquatic species such as the alkali bulrush Bolboschoenus maritimus and the sago pondweed Potamogeton pectinatus. Two naturalized alien species, the common fig Ficus carica and the hackberry Celtis occidentalis were also recorded. Only four of the taxa had an endozoochory syndrome. The plant taxa dispersed varied at two different spatial scales, with minor but significant differences between samples from sites separated by less than 1 km, and major differences between the two regions separated by c. 220 km. Synthesis. This is a unique study of the spatial variation in plants dispersed by endozoochory by a migratory waterfowl species, with a high taxonomic resolution and the first demonstration of avian endozoochory of ferns. We recorded eight taxa not previously reported as dispersed by mallards, showing how more empirical studies are essential, so we can understand which plants are dispersed by migratory birds. We found evidence that networks of interactions between granivorous waterbird vectors and dispersed plants vary spatially.

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“…Lake Balaton is the largest shallow lake (surface area: 593 km 2 ; mean depth: 3.2 m) in Central Europe, located 46°42′ – 47°04′ N; 17°15′ – 18°10′ E and 104.8 m above sea level. The lake is meso‐eutrophic with mean annual chlorophyll‐ a concentrations of 3.6–18.7 mg m −3 (Istvánovics et al., ). At present, only 47% of the lakeshore is in a natural or semi‐natural state with these sections covered by reed grass Phragmites australis .…”

Section: Methodsmentioning

confidence: 99%

Effect of stocking strategy on distribution and recapture rate of common carp Cyprinus carpio L., in a large and shallow temperate lake: implications for recreational put-and-take fisheries management

Specziár

Turcsányi

2014

J. Appl. Ichthyol.

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It is hypothesized that stocking procedure influences survival, growth and distribution of 19 introduced fishes; however, there is still limited information on the effect of various stocking 20 strategies on recaptures in natural freshwaters. The present study aimed to investigate how the 21 rate and distribution of anglers' common carp (Cyprinus carpio) catches vary with the 22 stocking season (i.e. spring, summer and autumn), lake area, method (i.e. shore and offshore 23 releases) and fish size (i.e. ≤500 g and >500 g) in large and shallow Lake Balaton, Hungary. 24In 2010, 4500 two-summer old, individually tagged common carp were stocked to test 36 25 releasing set-ups (i.e. three seasons × three lake areas × two methods × two size groups). 26Anglers reported date, location and fish size (standard length and weight) on 787 recaptures 27 within two years after the release. Recapture rate was highest in summer and lowest in 28 autumn stockings, but it was not affected by the stocking area, method and fish size. 29Recaptures dispersed most in space in stockings carried out in autumn and the centre of the 30 lake, but movement of fish was not influenced by stocking method and fish size. To conclude, 31in summer, stocking quotas should be evenly distributed along the entire shore line, while 32 early spring stockings may be optimized for transport cost and concentrated by each lake 33 basin. Late autumn stockings should be avoided, and the capacity of effective wintering ponds 34 developed. This study also provides a good framework for testing fisheries management 35 alternatives in other intensively fished habitats. 36 37 Keywords: angling, Cyprinus carpio, fisheries management, game fishes, mark and recapture, 38 stocking strategy. 39 3 Introduction 40Recreational fishery (i.e. angling) is displacing commercial fishery from freshwater habitats 41 in developed countries, especially in Central and Western Europe and North America 42 (Hickley, 2009). Intensive angling requires specific fisheries management. In general, anglers 43 are selective and fish for a few valuable species, putting unbalanced pressure on fish 44 assemblages (Vostradovský, 1991; Arlinghaus and Mehner, 2003; Hickley, 2009). 45Consequently, maintaining high angling activity in freshwaters generally requires stocking of 46 the most important game fishes, especially in areas where captured fish are not returned to the 47 water and natural recruitment is unsatisfactory. 48In some European and Asian countries, common carp, Cyprinus carpio L., is a much 49 preferred commercial and game fish (e.g. Czech Republic: Vostradovský, 1991; Germany: 50 Arlinghaus and Mehner, 2003; United Kingdom: Linfield, 1980; Poland: Wolos et al., 1998). 51Unfortunately, due to human-induced habitat alterations, wetland draining, floodplain 52 isolation by dykes, overfishing and intensive stocking of domesticated strains, most native 53 wild common carp populations have become endangered (e.g. River Danube subpopulation 54 listed as critically endangered in the IUCN Red Lis...

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Updating water quality targets for shallow Lake Balaton (Hungary), recovering from eutrophication

Cited by 88 publications

References 24 publications

Within‐lake distribution patterns of fish assemblages: the relative roles of spatial, temporal and random environmental factors in assessing fish assemblages using gillnets in a large and shallow temperate lake

Within‐lake distribution patterns of fish assemblages: the relative roles of spatial, temporal and random environmental factors in assessing fish assemblages using gillnets in a large and shallow temperate lake

Endozoochory of aquatic ferns and angiosperms by mallards in Central Europe

Effect of stocking strategy on distribution and recapture rate of common carp Cyprinus carpio L., in a large and shallow temperate lake: implications for recreational put-and-take fisheries management

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