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This paper presents the results of a malacological survey of the largest Croatian lake - Vrana Lake and its surroundings in Vrana Lake Nature Park. Altogether 21 species of aquatic non-marine molluscs (15 gastropods, 6 bivalves) have been recorded. Out of all recorded species, only 10 were documented in Vrana Lake, probably due to the higher salini...
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Bulk stable nitrogen isotope values of the carbonate-bound organic matrix in bivalve shells (δ¹⁵NCBOM) are increasingly used to assess past food web dynamics, track anthropogenic nitrogen pollution and reconstruct hydrographic changes. However, it remains unresolved if the δ¹⁵NCBOM values are also affected by directed ontogenetic trends which can b...
Members of the small bivalve family Cyrenoididae inhabit brackish waters of the eastern and western Atlantic Ocean. Cyrenoida floridana (Dall, 1896) from the western Atlantic is poorly known aside from shell descriptions. A detailed shell and anatomical study of C. floridana is here presented and compared with available data for Cyrenidae and Glauc...
Quantitative assessment and size-age structure of the population of bivalves Hypanis laeviuscula fragilis (Milachevitch, 1908) from Sasyk Reservoir are given in the article. The greatest quantitative development of H. laeviuscula fragilis reached in the open part of reservoir on a gray silt – up to 407 ind./m2 and 53,1 g/m2. The average density and...
ABSTRACT
The results of the paleontological study in « Val Gardena Sandstone » (Butterloch Bletterbach River, 15 km SSE of Bolzano) are here described. In this paper a list and an attempt at classification of a part of the findings (tetrapod footprints and cephalopods) are made. Moreover, the presence of fishes and bivalves in the Middle Permian of...
This study presents an analysis on the fishery status of edible mollusk Batissa violacea collected from Cagayan River, the largest river in the Philippines. The Philippine government recently categorized B. violacea as a threatened species due to its dwindling stocks from 2000 to 2012. Several concerns have been raised on the ongoing uncontrolled h...
Citations
... S. fuscus is distributed southwards of the North German lowlands, into Southern Europe. It occurs in Croatia (Beran et al. 2013), although it was not found in Montenegro (V. Pešić, oral pers. ...
Molecular genetic analyses of the nuclear ITS-2 spacer and the two mitochondrial markers COI and a cyt-b fragment (329 bp) of the Palaearctic freshwater snail species Stagnicola corvus (Gmelin, 1791), S. montenegrinus Glöer & Pešić 2009, S. fuscus (C. Pfeiffer, 1821), and S. palustris (O. F. Müller, 1774) are inconsistent, revealing a high percentage of hybrid specimens. The results lead to different conclusions depending on the phylogenetic relationships of the species analysed. Determined as S. montenegrinus, these specimens can now be interpreted as hybrids between S. corvus and another Stagnicola species, possibly S. palustris or S. fuscus. Hybrids between S. fuscus (role of females, i.e. inheriting mitochondria) and S. palustris (role of males) can only be distinguished from " genuine " S. palustris by the mitochondrial markers COI and cyt-b, but not by morphology. The study shows that the mitochondrial COI and cyt-b genes are not nearly as suitable for phylogenetic analyses within Stagnicola as is the nuclear marker ITS-2.
... The salinity of the water in which these sediments were deposited is constrained because the lower bound for whole populations of C. torosa to develop with smooth carapaces (~7‰ according to Frenzel et al., 2012) is similar to the upper bound for survival of Bithynia. The common European species B. tentaculata is normally considered unable to tolerate salinity beyond~6-7‰ (e.g., Järvekülg, 1979), although it has been reported in a brackish lake in Croatia where the salinity reaches~8‰ (Beran et al., 2013). However, a different, eastern Mediterranean, species, B. phialensis, lives at present in the Amik Basin (Şereflişan et al., 2009), although other taxa are found elsewhere in Turkey (e.g., Yıldırım, 1999;Glöer and Yıldırım, 2006) and in the Orontes catchment in Syria and Lebanon (e.g., Schütt, 1983;Bössneck, 2011;Glöer et al., 2012). ...
... Pag Island, L. Beran unpubl. records), Vrana Lake (Beran et al., 2013) or rivers flowing into the Adriatic Sea, e. g. the Zrmanja (Beran, 2011) or Krka (L. Beran, unpubl. ...
This paper presents the results of a malacological survey of the Korana, a river in central Croatia and west Bosnia and Herzegovina belonging to the Danube drainage area (Black Sea basin). The river has a natural character over most of its course except for several weirs and a short river section at Karlovac. Freshwater molluscs of this river at 13 sites between its outflow from Plitvice Lakes and inflow to the Kupa River at Karlovac were studied from 2009 to 2012. Molluscan assemblages of the first two sites are composed of only 3 species (Holandriana holandrii, Radix auricularia, R. labiata). Drying of the river stream is the probable reason for poor malacofauna at these two sites located in the upper part of the Korana. Rich molluscan assemblages comprising from 10 (site No. 3 and 4) to 22 (site No. 13) species were documented at other 11 sites. Altogether 33 aquatic molluscs (21 gastropods, 12 bivalves) were found in the Korana River. Theodoxus danubialis, Esperiana esperi, Microcolpia daudebartii, Holandriana holandrii and Bithynia tentaculata were dominant at most of the sites. Their numerous populations constituted the dominant component of molluscan biomass. The endangered thick-shelled river mussel Unio crassus was recorded at 11 sites and this finding probably means the existence of a numerous and continual population. The existence of a population of Unio crasus is very important and needs more detailed research. The occurrence of three non-native molluscs (Physella acuta, Ferrissia fragilis, Sinanodonta woodiana) was documented. Results of this research were compared with previous investigations and also with molluscan assemblages of the adjacent part of the Kupa River.
Sinanodonta woodiana (Lea) and Corbicula fluminea (O. F. Müller) are among the most invasive aquatic molluscs found in Europe. Both species were recorded in the Adriatic part of Croatia for the first time in 2019 although in the Danubian Croatia they were more common. An abundant population of S. woodiana was found in an oxbow of the Cetina River; mussels with shell length of ca. 12–17 cm dominated. A population of C. fluminea was recorded in the freshwater section of the Zrmanja River above the Jankovića Buk waterfall which forms the border between the brackish and the freshwater sections of the river. Possible pathways of their introduction and reasons for their rare occurrence in contrast to the Danubian Croatia are discussed.
Alien aquatic macroinvertebrates, especially invasive crustaceans and molluscs, have heavily impacted native species and ecosystem processes in freshwaters worldwide. Knowledge on alien species distribution is necessary to understand their dispersal dynamics and prevent future invasions, and to predict and reduce undesirable impacts. Literature data on alien macroinvertebrate species (AMS) in Croatia are sparse and a complete inventory of alien macroinvertebrates in Croatian freshwaters has never been conducted. The aim of this study was to present a database of AMS in Croatian freshwaters and to analyse their origin, pathways of introduction and distribution. The AMS database was built based on literature data and the authors’ unpublished data, and included a total of 1,411 records from 689 sites across Croatia. In total, 29 AMS were recorded until 2019, belonging to five major taxonomic groups: subphylum Crustacea (16 species) and phyla Mollusca (7 spp.), Annelida (4 spp.), Cnidaria (1 sp.), and Platyhelminthes (1 sp.). The area of origin of most species is the European Ponto-Caspian region (19 spp., 66%), and the rest originate from North America (5 spp.), Asia (4 spp.) and New Zealand (1 sp.). The most important pathways of unintentional primary introductions were stowaway-shipping (20 spp., 69%) and contaminant-fish stocking (6 spp., 21%). All 29 AMS species were found in the Black Sea Basin (Danube Basin) and five of those were also recorded in the river catchments of the Adriatic Sea Basin. For most AMS, the Sava and Drava Rivers are the main river corridors for their westward spread from the Danube. Since studies of AMS dispersal mechanisms are lacking and only a few studies report the impacts of invasive AMS in Croatia, future studies should be focused on the dispersal dynamics and ecological impact of invasive macroinvertebrates in Croatian freshwaters.
Results of a malacological survey of the Mrežnica River are presented. The molluscan assemblages of this river between the boundary of the Eugen Kvarternik military area and the inflow to the Korana River near Karlovac were studied from 2013 to 2018. Altogether 29 aquatic molluscs (19 gastropods, 10 bivalves) were found at 9 sites. Theodoxus danubialis, Esperiana esperi, Microcolpia daudebartii and Holandriana holandrii were dominant at most of the sites. The molluscan assemblages were very similar to assemblages documented during previous research into the Korana River. The populations of the endangered bivalves Unio crassus and Pseudanodonta complanata were recorded. An extensive population of another endangered gastropod Anisus vorticulus was found at one site. Physa acuta is the only non-native species confirmed in the Mrežnica River.
The results of a malacological survey of the Krka River between Knin and Skradinski buk waterfalls in the Krka National park are presented. The molluscan assemblages of this karstic river were studied from 2009 to 2013. Altogether, 27 species of freshwater molluscs (19 gastropods, 8 bivalves) were found at 14 sites. Theodoxus fluviatilis, Bithynia tentaculata, Valvata piscinalis, Stagnicola fuscus, Physa fontinalis and Anodonta anatina were dominant at most of the sites. A population of the endangered Anisus vorticulus was found upstream of the Skradinski buk waterfalls and in Visovac Lake.
Central-southern Turkey, NW Syria, and adjacent offshore areas in the NE Mediterranean region form the boundary zone between the Turkish, African and Arabian Plates. A great deal of new information has emerged in recent years regarding senses and rates of active crustal deformation in this region, but this material has not hitherto been well integrated, so the interpretations of key localities by different teams remain contradictory. We have reviewed and synthesized this evidence, combining it with new investigations targeted at key areas of uncertainty. This work has led to the inference of previously unrecognized active faults and has clarified the roles of other structures within the framework of plate motions provided by GPS studies. Roughly one third of the relative motion between the Turkish and Arabian plates is accommodated on the Misis-Kyrenia Fault Zone, which links to the study region from the Kyrenia mountain range of northern Cyprus. Much of this motion passes NNE then eastward around the northern limit of the Amanos Mountains, as previously thought, but some of it splays northeastward to link into newly-recognised normal faulting within the Amanos Mountains. The remaining two thirds of the relative motion is accommodated along the Karasu Valley; some of this component steps leftward across the Amik Basin before passing southward onto the northern Dead Sea Fault Zone (DSFZ) but much of it continues southwestward, past the city of Antakya, then into offshore structures, ultimately linking to the subduction zone bounding the Turkish and African plates to the southwest of Cyprus. However, some of this offshore motion continues southward, west of the Syrian coast, before linking onshore into the southern DSFZ; this component of the relative motion is indeed the main reason why the slip rate on the northern DSFZ, measured geodetically, is so much lower than that on its southern counterpart. In some parts of this region, notably in the Karasu Valley, it is now clear how the expected relative plate motion has been accommodated on active faults during much of the Quaternary: rather than constant slip rates on individual faults, quite complex changes in the partitioning of this motion on timescales of hundreds of thousands of years are indicated. However, in other parts of the region it remains unclear whether additional major active faults remain unrecognised or whether significant relative motions are accommodated by distributed deformation or on the many smaller-scale structures present.
