Attila Mozsár

Attila Mozsár
Balaton Limnological Research Institute

PhD

About

37
Publications
6,799
Reads
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282
Citations
Citations since 2017
22 Research Items
239 Citations
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201720182019202020212022202301020304050
Introduction
I am interested in consumer-driven nutrient dynamics in aquatic ecosystems and ecological stoichiometry. My current research focuses on intraspecific variability in organismal stoichiometry (C:N:P) of freshwater fish species, and understanding how this variability affects the role of fish in nutrient cycling. Furthermore, I am also interested in ecology - particularly the feeding habits - of invasive freshwater fish species.
Additional affiliations
September 2016 - February 2022
Research Instutute for Fisheries and Aquaculture
Position
  • postdoc
September 2013 - August 2016
Hungarian Academy of Sciences, Centre for Ecological Research, Balaton Limnological Institute
Position
  • Research Assistant
September 2010 - August 2013
University of Debrecen
Position
  • PhD Student

Publications

Publications (37)
Article
1. Changes in organismal stoichiometry (OS) may be driven by seasonal changes in lipid reserves (i.e., energy) and gonadal development in fish. Yet, these relationships are understudied. Hence, we investigated how seasonal changes in body lipid content (%L), gonadal development (GSI) can drive the seasonal variability of OS traits at the example of...
Article
Biological invasions have increasingly threatened indigenous species, influence metacommunity organization and consequently, global biodiversity. World-wide expansion of non-indigenous crayfish (NICS) is associated with dramatic changes in species poor indigenous crayfish (ICS) assemblages challenging conservation planning. We analysed long-term ch...
Article
The reproductive success of uniparental males depends much on their nutritional stage (i.e. body condition). Therefore, secondary sexual traits should convey information not only on fecundity but also on nutritional stage. To test this hypothesis, we evaluate relationships between head crest height (HCH), as a secondary sexual trait, relative teste...
Article
Full-text available
Common carp is one of the most important game fish in Europe. Due to the high exploitation and limited natural recruitment, direct stockings became a common and widespread stock enhancement practice in recreational fisheries. Sustainable recreational fisheries management requires continuous monitoring programs to define the stocking size and distri...
Article
Full-text available
A hagyományos és helyi ökológiai tudás – a nemzetközi szakirodalomban traditional ecological knowledge és local ecological knowledge – alaposabb megismerése a XXI. század leggyorsabban fejlődő tudományágai közé tartozik. A hagyományos tudásanyag elsősorban a tájjal legszorosabb kapcsolatban élő gazdálkodók, pásztorok, halászok természet megfigyelés...
Article
Full-text available
Various types of ground baits are loaded to lakes by anglers, but the ecological role of these materials is often overlooked. Thus, the aims of this study were to conduct a quantitative and qualitative assessment of the baits used by anglers in the largest lake of Central-Europe (Lake Balaton, Hungary), estimate the annual nutrient balance of recre...
Presentation
A Kárpát-medence inváziós halfajai közül az egyik legnagyobb ökológiai és gazdasági problémát a fekete törpeharcsa jelenti, mégis nagyon kevés ismerettel rendelkezünk a hazai állományok populációdinamikai jellemzőiről. Munkánk során négy Körös menti holtmeder feketetörpeharcsa-populációjának termékenységét vizsgáltuk az őszi nyugalmi fázisban. A ha...
Poster
A horgászat során fogott halak tudományos célokra történő felhasználása nem új keletű, az így vett minta reprezentativitása azonban kérdéses. Leginkább a populáció testhosszeloszlásáról szolgáltathat bizonytalan információval, hiszen a horgászmódszerek erősen méretszelektívek. Kísérletesen vizsgáltuk a horgászat során alkalmazott csali és a horogmé...
Article
Full-text available
Bigheaded carps (bighead carp, Hypophthalmichthys molitrix, and silver carp, Hypophthalmichthys nobilis) and their hybrids play an important ecological and economic role in their original habitat, while their introduced stocks may pose serious ecological risks. To address questions about the persistence and invasiveness of these fish, we need to be...
Article
Full-text available
The recreational use of water bodies presents new challenges and pressures on lake ecosystems. We focused on how recreational beaches influence the shoreline biodiversity of Lake Balaton, Hungary. Taking into account the establishment of beaches, we examined natural reed vegetated shorelines (representing natural situation), open areas (representin...
Article
Full-text available
Semi-intensive common carp (Cyprinus carpio) farm technology uses several feed types affecting the growth performance; however, we know less about their long-term effects on water quality. Herein, we evaluated the effects of three commonly used feeds—moderate levels of fish meal and fish oil feed (FF), plant meal and plant oil feed (PF), and cereal...
Presentation
Zo všetkých invazívnych druhov rýb prítomných v Maďarsku, je sumček čierny jeden z tých, ktoré spôsobujú najväčšie ekologické a hospodárske problémy. Napriek tomu je málo informácii o populačnej dynamike týchto populácii. Zisťovali sme plodnosť u štyroch populácii z mŕtvych ramien rieky Körös, v jesennom a jarnom období. Odber vzoriek sme vykonával...
Poster
Využitie odberu vzoriek rýb rybárskou udicou vo výskume je zriedka používané, reprezentatívnosť vzoriek je však otázna. Naviac poskytuje neisté informácie o dĺžkovej štruktúre populácii, nakoľko rybolovné metódy môžu byť silne selektívne. Experimentálne sme skúmali vplyv často používaných nástrah a veľkosti háčikov využívaných v rybolove na veľko...
Article
Full-text available
While the use of catch of anglers for scientific purposes is common, we know less about its representativity. Due to the size selectivity of most angling techniques, the catch could reflect on length frequency distribution of the sampled population, but we should take this information with caution. In this paper, we focus on studying the effect of...
Article
Full-text available
The aim of our study was to summarise the current status of the non-native Decapod species in Hungary. Eight non-native Decapod species have been reported recently from Hungary. The first introduced species was the spiny cheek crayfish (Faxonius limosus) found in natural habitats in 1985. The signal crayfish (Pacifastacus leniusculus) also expanded...
Article
Full-text available
Two species from the families Acipenseridae and Polyodontidae, Russian sturgeon (Acipenser gueldenstaedtii, Brandt and Ratzeberg, 1833; functional tetraploid) and American paddlefish (Polyodon spathula, Walbaum 1792, functional diploid) were hybridized. The hybridization was repeated using eggs from three sturgeon and sperm from four paddlefish ind...
Article
Full-text available
In the last decades, several hydroelectric power stations were constructed in Slovakia, which have considerable effect on the fish community of rivers. To reduce their ecological impact, fishways were usually installed at the dams of these stations. Our research aimed to test the fish passage function of the fishway of Hronská Dúbrava small hydroel...
Presentation
Szlovákiában a nagyobb folyókon létesített különféle vízerőművek szerteágazó környezeti és ökológiai hatásai számottevően befolyásolják az ott előforduló halközösségek életét. Munkánk során arra kerestük a választ, hogy mely halfajok használják előszeretettel a hallépcsőket. Mintavételi helyszínnek a Garam folyón (Hron) létesített felsőbesenyői (Hr...
Article
The worldwide spread of bigheaded carp (Hypophthalmichthys spp.) is considered an ecological threat and problem in many countries. The aim of this study was to consider the likelihood of bigheaded carp reproduction in Lake Balaton and its catchment area (Hungary). The within-year trends of gonadosomatic index values show that female bigheaded carp...
Article
Full-text available
Planktivorous silver carp and bighead carp (collectively, the bigheaded carps) have been stocked worldwide and their invasion has caused severe impacts on many freshwater ecosystems. Exploiting the chance provided by the specific hybrid bigheaded carp stock in Lake Balaton (Hungary) covering the entire morphological range between the two species (i...
Article
Full-text available
Environmental heterogeneity plays a determinant role in structuring taxonomic and functional composition of local assemblages via various interacting processes as synthesized in the metacommunity theory. In this study, we evaluate the relative roles of local environmental and landscape filters, spatial constraints and seasonality in organization of...
Article
Three species of small-sized rheophilic Barbus fishes are endemic to and widely distributed throughout the mountain regions in the Danube River basin. In Hungary, barbels referred to as B. petenyi occur in streams in the foothills of the Carpathians near the borders with Slovakia, Ukraine and Romania. However, up to now, no genetic investigations w...
Article
Full-text available
The gut contents of filter-feeding fish often contain considerable amounts of viable phytoplankton cells; thus, these animals can act as vectors in the horizontal and vertical transport of algae. In this study, the potential role of the introduced filter-feeding Asian carps (hybrids of silver carp Hypophthalmichthys molitrix and bighead carp H. nob...
Article
Full-text available
Bigheaded carps and especially silver carp have been considered as an effective biological control for algal blooms, thus were introduced to several countries in the last decades, including Hungary. Our aim was to explore the feeding habits of bigheaded carps in Lake Balaton (Hungary), where the stock consists mainly of hybrids (silver carp × bighe...
Conference Paper
Bighead carp (Hypophthalmichthys nobilis), silver carp (H. molitrix) and their hybrids (collectively referred as Asian carps−AC) are primarily planktivorous cyprinid fishes that have been introduced into more than 30 countries around the world, including Hungary. However, recent studies demonstrated that AC can adversely affect the water quality an...
Conference Paper
Bighead carp (Hypophthalmichthys nobilis) and silver carp (H. molitrix) are freshwater planktivorous fish originated from Eastern Asia, which were introduced all over the world. Previous studies suggested that bighead carp with comb-like gill rakers feeds mainly on zooplankters, while silver carp with sponge-like filtering apparatus filters smaller...
Conference Paper
Asian carps (bighead carp Hypophthalmichthys nobilis × silver carp H. molitrix) had been introduced into Lake Balaton (Hungary) from 1972 to increase fishery yields and as a biological control of algal blooms. Although the stocking was stopped by 1983, the biomass of Asian carps is still high in the lake, constituting about one-third of the total f...
Article
Reliable estimation of the diet composition of filter-feeding Asian carps is essential to evaluate their effects on ecosystem functioning. In previous studies, the diet composition of these fishes was primarily determined based on the analysis of foregut contents. To assess the reliability of foregut content analysis in diet assessments, these were...
Article
In the last two decades, the invasion of the Amur sleeper (Perccottus glenii Dybowski, 1877) originating from the Far East can be observed in Eastern and Central Europe. Since the Amur sleeper is a non-game fish species, few detailed studies exist on its feeding ecology both in its native and invaded habitats. We examined the seasonal feeding ecolo...
Article
The reliable determination of the total phosphorus (P) content stored in aquatic biota is essential for studies on nutrient stoichiometry, as well as for effective lake management measures. However, a variety of methods are found in the literature for sample P content determination, which renders it necessary to assess whether the data reported in...
Article
Morphometric-based condition indices are widely used to assess proximate body composition and, collaterally, feeding and living conditions of fish. However, the exact relationship between condition indices and proximate body composition of fish and its relatedness to life history traits and seasonality has yet to be fully explored. Therefore, the a...
Article
Full-text available
The aim of this study was to investigate the growth of the Amur sleeper (Perccottus glenii, Dybowski 1877) in the Rakamaz–Tiszanagyfalui‐Nagy‐morotva. Our study sample consisted of 669 individuals collected three times from the Rakamaz–Tiszanagyfalui‐Nagy‐morotva from 2011 to 2013. The relationship between standard (SL) and total length (TL) was de...
Article
Full-text available
Stoichiometry theory states that the elemental composition of individual organisms is a taxon-dependent trait, and that organisms maintain relatively constant body nutrient composition, independent of food nutrient content or ingestion rate. Some recent studies have pointed out that assuming a strict homeostasis in fish is an over-simplification, s...
Article
Full-text available
The toxicity of three highly volatile organic solvents – tetrachloroethane (Cl2HC–CHCl2), tetrachloroethylene (Cl2C=CCl2), trichloroethylene (ClHC=CCl2) – was studied on Unio crassus specimens. The tested chlorinated hydrocarbons sink to the bottom of standing water bodies due to their high density; therefore they represent an increased risk for be...
Article
Full-text available
The introduced Amur sleeper (Perccottus glenii Dybowski, 1877) has been widely established along the Tisza River and its tributaries since its first appearance in the Carpathian Basin in 1997. Our study sample consisted of 366 individuals collected from five sampling sites of the Middle Tisza Region from 25 October to 8 November 2011. The relations...

Questions

Question (1)
Question
I have found some nice papers about the length – dry weight relationships/equations of the main zooplankton groups (e.g. Dumont et al. Oecologia 1975; Rosen J. Freshwat. Ecol. 1981). But, I failed to find such useful equations for wet weight.
Can I convert the dry weight somehow to wet weight?
Thank you so much in advance!!!
Attila

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