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The map of the Dyje River and its tributaries with the geographical distribution of the sampling sites. Drawn by MARTIN DOLEJŠ
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... field work was conducted in 2001-2013. In to- tal, 41 sites were sampled in the Dyje River, including the Vìstonice dam reservoir (sites 20-30, one of the five dam reservoirs). The remaining 31 sites were lo- cated on five tributaries, and three sites on the cana- lised Morava River upstream of the inflow of the Dyje River ( Fig. 1, Appendix 1). The main sampling method for freshwater molluscs was washing vegeta- tion or sediments on a metal sieve (kitchen strainer, diameter 20 cm, 0.8 mm mesh), combined with col- lecting by eye (searching of stone, wood and anthropogenic material, e.g. plastic bags and bottles, surface). Unionids were sampled by means of visual inspection ...
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... non-native molluscs were recorded in the study area (Fig. 10). P. antipodarum, an invasive spe- Freshwater molluscs of the Dyje (Thaya) River and its tributaries 149 cies originating from New Zealand, occurs in the Dyje River except the upper section, and also in the Jevi- šovka and Jihlava rivers. North American Ph. acuta was found in the Dyje River where it was one of the domi- nant species in ...
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... exception is L. naticoides which occasionally occurred in the Dyje River upstream of the system of three dam reservoirs, and also the population of V. acerosus which was re- corded in the lowest section of the Jevišovka River and upstream of these reservoirs (see Fig. 6). The popula- tions of these species are probably relicts that inhab- ited (together with Th. danubialis) this river section before building of the system of three dam reservoirs (BERAN & HORSÁK 1998). The section of the Dyje around the inflow of the Jihlava and Svratka rivers with its extensive floodplain is among the sites with the highest diversity, not only of freshwater molluscs, and was damaged by construction of the reservoirs be- tween 1969and 1989(BUÈEK 2012). ...
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... studied water- courses. The situation of the population of endan- gered thick-shelled river mussel U. crassus is a good example of how these changes affected the molluscan asemblages of this river. At present this population is divided in two (three) subpopulations, one around the Czech-Austrian boundary in the upper part of the river (sites No. 1-4, 6). This part has a natural charac- ter and ends in the Vranov dam reservoir. The second subpopulation (sites No. 16-18) inhabits the short part of the river which has also a relatively natural character and is located about 18 km downstream of the Znojmo dam reservoir. This part is followed by a canalised watercourse and a system of ...
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... the species was introduced in the Vranov dam res- ervoir (construction finished in 1934) from the Labe (Elbe) River drainage area in the past (e. g. during Freshwater molluscs of the Dyje (Thaya) River and its tributaries building of the dam reservoir). The population lives 115 km away from the nearest population of V. acerosus (site No. 52, see Fig. ...
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... the populations of com- mon as well as endangered unionids, together with water pollution and habitat alteration. On the other hand, in the lowest section of the Dyje River (site No. 41) where stones are very rare, live specimens and also empty shells of S. woodiana are often used by criti- cally endangered Th. danubialis as suitable microhabitat (Fig. ...
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... Beran Fig. 11. Theodoxus danubialis uses living specimens and empty shells of Sinanodonta woodiana in the lowest parts of the Dyje River where stones and other suitable habitats for Th. danubialis are rare. Photo: LUBOŠ BERAN Ph. acuta was first recorded in the Dyje river basin be- tween 1969 and 1971 in a small ditch in the floodplain of the Dyje ...
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... are rare. Photo: LUBOŠ BERAN Ph. acuta was first recorded in the Dyje river basin be- tween 1969 and 1971 in a small ditch in the floodplain of the Dyje River in Lednice (BALÙSEK & VOJTEK 1973) (the nearest studied locality is site No. 32) and later was recorded also in the Dyje River and its tribu- taries (BERAN & HORSÁK 1998). The non-native gas- tropod Gyraulus parvus inhabits only the floodplain of the Dyje River (BERAN & HORSÁK 2002) and was not found in the studied rivers. ...
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... V současné době její tok ústí společně se Svratkou do prostřední z novomlýnských nádrží. Malakofauna jejího dolního toku byla v nedávné minulosti zkoumána a k nejzajímavějším výsledkům patřil nález populace celoevropsky ohroženého mlže Unio crassus (Beran 2013). I to bylo jedním z důvodů pro pokračování průzkumu středního a horního toku Jihlavy, jehož výsledky jsou zde předloženy. ...
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... PiEcHocki 1969, obrdLik et https://doi.org/10.12657/folmal.027.016 al. 1995, wEiGand & stadLEr 2000, JurkiEwiczkarnkowska 2008, 2009, PérEz-QuintEro 2011, bEran 2013, LEwin 2014, bódis et al. 2016. Molluscs were considered to be good descriptors of habitat diversity (e.g. ...
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Abstract: Investigations of aquatic mollusc assemblages were conducted within a semi-natural catchment
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... With a high frequency of suitable and environmentally heterogeneous lentic habitats developed under conditions of fertile bedrock and warm climate, the Dyje River lowland is an exceptional region for the occurrence of species-rich freshwater mollusc assemblages. In total, 58 species of aquatic molluscs have been reported in the region, with a maximum of 22 species recorded in a single site (Beran & Horsák, 1998;Beran, 2013;Horsák et al., 2018). ...
... By sampling 62 stagnant water bodies, we obtained data covering a wide range of species richness, with a total of 32 species recorded. This rather high number of species, representing 57% of the regional fauna (Beran & Horsák, 1998;Beran, 2013;Horsák et al., 2018), was found despite intensive agricultural land use in the study area. This confirms persistence of habitats suitable for a large number of aquatic mollusc species. ...
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... Nicméně, malakofauna řeky nebyla nikdy podrobněji zkoumána. V roce 2010 nalezl autor jediného jedince ohroženého druhu Unio crassus v Oslavě u Zňátek a o rok později byla zjištěna populace tohoto druhu v Jihlavě pod ústím Oslavy (Beran 2013). Tyto nálezy a předpoklad výskytu uvedeného druhu v Oslavě byly hlavním podnětem pro podrobnější průzkum řeky Oslavy a to především v roce 2017. ...
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The problem of invasive alien species is currently one of the greatest threats to native biotopes and generates significant economic losses and often also risks to human health and life (Vitousek et al. 1996, Regulation... 2014). Despite efforts to implement systemic solutions at both national and international levels, there are still no effective methods for large scale eradication and control of many invasive alien species (Park 2004, Skorupski 2016). This problem concerns not only species representing different systematic groups, but also their parts or products capable of survival and reproduction. The overarching legal document of the European Union is the Regulation (EU) No 1143/2014 of the European Parliament and of the Council of 22 October 2014 on the prevention and management of the introduction and spread of invasive alien species. This Regulation defines an alien species as any live specimen of a species, subspecies or lower taxon of animals, plants, fungi or micro-organisms introduced outside its natural range; it includes any part, gametes, seeds, eggs or propagules of such species, as well as any hybrids, varieties or breeds that might survive and subsequently reproduce (Regulation... 2014). Invasive alien species means an alien species whose introduction or spread has been found to threaten or adversely impact upon biodiversity and related ecosystem services (Regulation... 2014). Of the 12,000 alien species found in Europe, only 10-15% are invasive (Sundseth 2014). This apparently small proportion is responsible for economic losses of around € 12 billion (Kettunen et al. 2009). The damage caused by invasive alien species in the natural sense is much more difficult to estimate in the monetary sense. For example, it is known that invasive alien species are associated with 54% extinctions of animals for which the causes of extinction have been identified. In 20% of cases, invasive alien species were the only cause of extinction (Clavero and García-Berthou 2005). The immediate causes of the threat of invasive alien species to biodiversity and related ecosystem services are their impact on habitat change, predation on indigenous species, cross-species competition, disease transmission, substitution of native species for much of their range, and hybridization (Sundseth 2014). Abovementioned facts illustrate the scale of the problem of biological invasions of alien species. In the monograph „Invasive alien species – identification ofthreats to protect biodiversity” are presented examples of invasive alien species in Poland, representing various systematic groups, with different causes and pathways for introduction, as well as different history of invasions, degree of spread across the country, status and scale of negative impact on native fauna and flora. The aim of the publication is not only to describe the phenomenon of biological invasions, but also to provide examples of counter-measures based on the best practices supported by scientific research. The monograph is published within the international project “Exchange of knowledge, experiences and best practices in study and control of the invasive alien species populations in Iceland and Poland”, financed by the Financial Mechanism of the European Economic Area (EEA) 2009-2014 and the National Fund for Environmental Protection and Water Management (Poland), and implemented by the Green Federation “GAIA” in partnership with the West-Iceland Nature Research Centre and in cooperation with the Polish Society for Conservation Genetics LUTREOLA, West Pomeranian University of Technology, Szczecin and the Foundation AQUARIUS.
... In Poland, apart from lakes, the species was found primarily in fish ponds (Mizera & Urbańska 2003;Andrzejewski et al. 2013). In other European countries, however, its numerous populations often colonize rivers and lakes (Popa et al. 2007;Pou-Rovira et al. 2009;Lajrner & Crnčan 2011;Douda et al. 2012;Beran 2013;Colomba et al. 2013;Kamburska et al. 2013;Guarneri et al. 2014;Horáčková et al. 2014;Beran 2015). ...
... Our results differ from the reports of Douda et al. (2012) and Beran (2013), who found that S. woodiana is a dominant species at some sites in Czech rivers (e.g. Kyjovka and Dyje), which indicates that the species finds favorable conditions in rivers of Central Europe, ...
The Asiatic bivalve Sinanodonta woodiana (Lea, 1834), which is more and more widespread in all parts of Europe, in Poland has been mostly reported from lentic waters, especially fish ponds. In contrast to some other European countries, no data have been published on its presence in rivers of Poland. In 2015, monitoring was carried out in the lower Oder River and in the mouth of the Warta River, as a result of which S. woodiana was recorded there for the first time. This was possible due to prolonged drought, which led to extremely low water levels in most of the inland water bodies and watercourses, so that other research methods could be used. The presented results confirm that the species spreads easily by colonizing waters of various types, which in the future may lead to the formation of large populations. © 2017 Faculty of Oceanography and Geography, University of Gdańsk, Poland.
... Anodonta woodiana reached the study site around 2006 (Beran, 2013), with mussel colonisation being independent of gobiid colonisation. Malacological studies (e.g. ...
... Malacological studies (e.g. Beran, 2013) have confirmed the presence of a unionid community at the study site, consisting of swollen river mussels, Unio tumidus Philipsson 1788, and duck mussels, Anodonta anatina Linnaeus, 1758 (both native), along with the exotic A. woodiana. ...
... Large numbers of A. anatina, closely related to A. woodiana, have also been observed around the mouthparts of juvenile and adult native fish (Bla zek & Gelnar, 2006). Note, however, that while A. anatina are abundant at the study site (Beran, 2013), infection of fish ELS was not observed due to a temporal mismatch in hatching (Hinzmann et al., 2013). Unlike A. anatina, which mostly release glochidia in spring or autumn (Watters & O'Dee, 2000), A. woodiana glochidia are released during summer, which coincides with the occurrence of both native fish and, to an even greater extent, exotic gobiid ELS. ...
Introduction of an exotic species has the potential to alter interactions between fish and bivalves; yet our knowledge in this field is limited, not least by lack of studies involving fish early life stages (ELS).
Here, for the first time, we examine glochidial infection of fish ELS by native and exotic bivalves in a system recently colonised by two exotic gobiid species (round goby Neogobius melanostomus , tubenose goby Proterorhinus semilunaris ) and the exotic Chinese pond mussel Anodonta woodiana .
The ELS of native fish were only rarely infected by native glochidia. By contrast, exotic fish displayed significantly higher native glochidia prevalence and mean intensity of infection than native fish (17 versus 2% and 3.3 versus 1.4 respectively), inferring potential for a parasite spillback/dilution effect. Exotic fish also displayed a higher parasitic load for exotic glochidia, inferring potential for invasional meltdown. Compared to native fish, presence of gobiids increased the total number of glochidia transported downstream on drifting fish by approximately 900%.
We show that gobiid ELS are a novel, numerous and ‘attractive’ resource for unionid glochidia. As such, unionids could negatively affect gobiid recruitment through infection‐related mortality of gobiid ELS and/or reinforce downstream unionid populations through transport on drifting gobiid ELS. These implications go beyond what is suggested in studies of older life stages, thereby stressing the importance of an holistic ontogenetic approach in ecological studies.
... This difference relates most likely to the mode of dispersal, which can be more effective for a small sized G. parvus with a potential for a passive dispersal mainly by waterbirds (Van Leeuwen et al., 2012). Sinanodonta woodiana has a scattered distribution in southern Moravia and southern Bohemia (Fig. 1), forming dense populations in some lowland rivers (Beran, 2013a) and dam water reservoirs (Horáčková et al., 2014). Its glochidia can develop at various host fish, including many native species ; thus, we can expect the acceleration of its spreading in future. ...
The number of non-native species has dramatically increased over the last decades in many aquatic habitats of central Europe. Although the spreading of alien mollusc species can poses a serious threat to many native species, no attempt has been made to assemble and analyse an extensive dataset collected over a long time span. So far, eight non-native species of aquatic molluscs - five gastropods and three bivalves - have been recorded in the wild in the Czech Republic in central Europe. We assembled a dataset consisting of 1,783 sites with the presence of these non-native species recorded between 1891 and 2014. We aimed to explore the time course and spatial pattern of the invasions and to define some of the gross predictors of the occurrence of these species by categorizing their sites based on habitat type, elevation and distance from the nearest large river. We found that most of these species expressed affinities to non-natural standing waters and large rivers. The most invaded parts of the Czech Republic were large lowlands, especially the Elbe River basin. In contrast, hilly and mountain areas were notably less invaded as the number of records sharply decreased towards higher elevations for all studied species except Gyraulus parvus. The highest invasion rate was documented for Physella acuta and Potamopyrgus antipodarum, in contrast to two modern invaders (Menetus dilatatus and Corbicula fluminea) that had a much lower rate of colonisation. However, the other four species showing an intermediate rate of spreading were recorded for the first time both 70 years ago (Dreissena polymorpha and Ferrissia fragilis) and less than 20 years ago (Gyraulus parvus and Sinanodonta woodiana). Large rivers serve as the most important corridors for the spreading of non-native species, with a significant association between the number of non-native species recorded and the distance from the 8th- and 9th-order rivers.