P. Cakic

A report of Eriocheir sinensis (H. Milne Edwards, 1854) [Crustacea: Brachyura: Grapsidae] from the Serbian part of the Danube River

Two specimens of the Chinese mitten crab, Eriocheir sinensis, were found in the Serbian part of the Danube River (1995, 1084

Macroinvertebrates along the Serbian section of the Danube River (stream km 1429–925)

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Model of the assessment of the critical risk of extinction and the priorities of protection of endangered aquatic species at the national level

km of the watercourse and 2001, 1174

DISTRIBUTION OF NON-INDIGENOUS TUBIFICID WORM BRANCHIURA SOWERBYI (BEDDARD, 1892) IN SERBIA

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Monogenean Trematods of Chub Leuciscus Cephalus Albus Bonaparte, 1838 from the Lake Ohrid (Macedonia)

km). Description, biology, origin and distribution of this species, as well as potential impact to the aquatic ecosystems are discussed. These are first records of this invasive crab in Serbian part of the Danube River.

DISCOCOTYLE OHRIDANA N. SP. (MONOGENEA: DISCOCOTYLIDAE) ON THE GILLS OF OHRID BELVICA SALMOTHYMUS OHRIDANUS (PISCES: SALMONIDAE) FROM THE LAKE OHRID, MACEDONIA

Results of the investigation of the aquatic macroinvertebrate fauna along a 504 km stretch of the Danube River in Serbia are presented. A total of 74 macroinvertebrate taxa were observed during a 2001 survey. Oligochaeta and Mollusca were the principal components of the community with regard to species richness and abundance. Based on data on the qualitative composition of the macroinvertebrate fauna, a correspondence analysis divided the investigated stretch in three sectors — upper (Pannonian), Iron Gate sector and entrance sector to the Iron Gate stretch. The distribution patterns of certain species supported the division of sectors defined by correspondence analysis.

Pan-continental invasion of Pseudorasbora parva: Towards a better understanding of freshwater fish invasions

In the period 1995–2006, the biodiversity of the aquatic habitats in the area of Serbia was explored, with the aim to identify the endangered species of macroalgae, macroinvertebratae and fishes. During the work a data base was formed (Aquatic Ecosystems Diversity in Serbia, AEDSer), containing the data from exploring the biodiversity of the aquatic ecosystems of Serbia since 1860. Based on the data base, classification of the aquatic species was made into categories of endangerment based on IUCN criteria. The following was noted: (1) the global IUCN category assigned to the species often is not identical with the national status of endangerment; and (2) the species that are given a category of endangerment at the national level do not have the same realistic risk of extinction in all their habitats. This remark imposed the need for a model for assessing the critical risk of extinction of the endangered species and determining the priorities of their protection at the national level. Two categories of characters were used to develop the model: the characters that determine the degree of ecological specialisation of the species based on the circumstances of habitat; and the characters suggesting the risk factors from the system: “HIPPO” in the spatial and time dimension. The possibility to apply the model was tested on 10 aquatic species belonging to different categories of endangerment at the national level (macroalgae 2, macroinvertebrates 7, and fishes 1 species). The model based on points determined the level of extinction risk and, that way, the species needing urgent conservation from the same or different categories of endangerment were isolated. The model suggested can contribute to a more efficient defining the conservation priorities.

Distribution of Anodonta (Sinanodonta) woodiana (Rea, 1834) in inland waters of Serbia

ABSTRACT Recently, dispersion of invasive species became an important theme, since the man-aided outspread of the organisms was recognized as one of the major threats to the biodiversity. Aquatic biotopes are, due to its unique features, among the most disposed ecosystems to this kind of disturbance. Non-indigenous species of different origin were found among plants, vertebrates and invertebrates. Aquatic worm Branchiura sowerbyi (Beddard 1892) is obvious example of human induced dispersal of invertebrates. The aim of the study was to contribute to the cognition of the current distribution of this invasive species and to point up, once again, the risk of devastation of aquatic ecosystems caused by distribution of alien species. B. sowerbyi was for the first time observed in Serbia in 1972 in fish pond in Vojvodina. Since that time the worm spread its areal and now it could be found in a lot of ponds, channels, reservoirs and lowland rivers in Serbia. According to our results B. sowerbyi has been well adapted in artificial and modified water bodies in Serbia.

SUPEROXIDE DISMUTASE AND CATALASE ACTIVITIES IN THE LIVER AND MUSCLE OF BARBEL (BARBUS BARBUS) AND ITS INTESTINAL PARASITE (POMPHORYINCHUS LAEVIS) FROM THE DANUBE RIVER, SERBIA

ABSTRACT During the parasitological investigations on the gills of Leuciscus cephalus albus from Lake Ohrid (Macedonia), are found 4 monogenean species: Dactylogyrus sphyrna, Dactylogyrus folkmanovae, Dactylogyrus vistulae and Paradiplozoon ergensi. The total prevalence of infestation is 58,0% and the highest prevalence is of Dactylogyrus sphyrna (found in 26,0% of chubs). The average intensity of infestation is 5,50, and the highest level is that of Paradiplozoon ergensi. All monogenean species mentioned in this study represents a first record for the fishes from natural lakes in Macedonia, with the exception of Paradiplozoon ergensi, previously found in the Lake Ohrid. Among the monogenean species, found out in Lake Ohrid, the greatest pathological influence is associated with Dactylogyrus vistulae and Paradiplozoon ergensi.

Distribution of Asian clams Corbicula fluminea (Müller, 1774) and C. fluminalis (Müller, 1774) in Serbia

ABSTRACT Discocotyle ohridana n.sp. is described from the gills of Ohrid belvica Salmothymus ohridanus Steindachner, 1892; (syn. Acantholingua ohridana Hadzisce, 1961) from the Lake Ohrid, Macedonia. According our investigation the new species D. ohridana n.sp. differs 56.47% of observed S. ohridanus have been infected and average intensity of infestation is 2.84.