Studies on Unionidae populations from the Crapina-Jijila complex of pools (Danube zone liable to inundation)

Tudorancea, Claudiu

doi:10.1007/bf00046744

Cited by 40 publications

(31 citation statements)

References 4 publications

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“…In the lake complex Crapina-Jijila in the Danube delta the bivalves were 48-68 mm long (TUDORANCEA 1968(TUDORANCEA , 1969(TUDORANCEA , 1972, in lake Kortowskie their length ranged from 15 to 65 mm (WIDUTO & KOMPOWSKI 1968) while in Scandinavian lakes of various trophy the range was 57-74 mm (AGRELL 1949). The smallest mean length -54.2 mm -was found in bivalves from the Gocza³kowice Reservoir (KRZY¯ANEK 1994).…”

Section: Discussionmentioning

confidence: 99%

Unionid bivalves  of the pilica river catchment area

Abraszewska-Kowalczyk¹

2002

Folia Malac.

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The 1995-1998 studies on the unionid fauna of the Pilica catchment area (C Poland) included 103 localities in the river, tributaries, floodplain water bodies and the dam reservoir on the river. As a result of qualitative and quantitative sampling six unionid species (one represented by two forms) were recorded: Unio crassus Philipsson, U. tumidus Philipsson, U. pictorum (Linnaeus), Anodonta cygnea f. cygnea (Linnaeus), A. cygnea f. cellensis (Schröter), A. anatina (Linnaeus) and Pseudanodonta complanata (Rossmässler). Three of them: U. crassus, A. cygnea f. cygnea and P. complanata were found to be rare. Dominance structure and density of unionids are discussed. Spatial distribution and abundance are analysed on the background of such ecological factors as character of bottom sediments, bottom configuration, vegetation, distance from shore, seston content as well as physico-chemical, hydrobiological and bacteriological water pollution. Ecological preferences of each species are described. Selected populations are characterised with respect to their age structure. Species which were abundantly represented are characterised with respect to their metric characters and sexual dimorphism, as well as effect of zebra mussel on their growth and condition.

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Section: Discussionmentioning

confidence: 99%

Unionid bivalves  of the pilica river catchment area

Abraszewska-Kowalczyk¹

2002

Folia Malac.

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“…The lower fraction of organic matter and the high portion of the shell mass in the body of U. terminalis resulted in a caloric content (0.171 Kcal/gw.m) which is substantially lower than that obtained for European Unio species (0.4-0.7 Kcal/gw.m; Tudorancea & Florescu, 1968;Tudorancea, 1972;Alimov, 1981).…”

Section: Body Compositionmentioning

confidence: 99%

“…Further- more, the darker and less dark rings alternate. Such a pattern of ring emergence is specific for clams which reproduce from the third or fourth year and typical for many Unio species (Tudorancea, 1972;Alimov, 1981). It is reasonable to assume that the less dark rings are reproductive while the darker ones are annual.…”

Section: Growthmentioning

confidence: 99%

“…The adult clams are inaccessible for most fish due to their large and hard valves. The importance of unionid clams in waterbodies is related to the high capacity of their filtration activity, enabling them to purify the water from the suspended matter, and their participation in the nutrient recycling and energy fluxes (Tudorancea, 1972;Stanczykowska, 1975Stanczykowska, , 1977Stanczykowska, , 1984Walz, 1978;Alimov, 1981;Miura & Yamashiro, 1990). Several studies also indicate the possibility of using the analysis of bivalve shell growth for biological monitoring of environmental conditions (Freeman & Dickie, 1979;Jones, 1981;McGuaig & Green, 1983: Mitchell, 1984Hanson et al, 1988;Arter, 1989).…”

Section: Introductionmentioning

confidence: 99%

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Distribution, growth, production, and ecological significance of the clam Unio terminalis in Lake Kinneret, Israel

1993

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The distribution, body composition, growth rate, and population structure of Unio terminalis were measured at different sites of Lake Kinneret (Israel). Maximum clam density was found on the muddy sand between 0.3-6 m depth. Clams were most abundant in the River Jordan inlet zone, where they showed the highest growth rate. This was probably related to both highest food availability and the highest density of fish hosting Unio glochidia in this area. U. terminalis in Lake Kinneret has a more massive shell and ash content as compared with the European Unio species. The annual P/B ratios of U. terminalis populations at different sites were similar and ranged within 0.17-0.18. The computated filtration capacity and energetic budget permit the assumption that the U. terminalis population plays a substantial role in removal of organic particles from the water in the Kinneret shallow inshore zone (up to 15 m depth), and in nutrient recycling.

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“…As an example, until the middle of the XX century freshwater mussels were exploited principally to produce nacre buttons, for natural pearls and to feed poultry (Tudorancea 1972;Bowen et al 1994). Mussel populations accordingly declined in areas where these were important activities.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variations in population dynamics and biomass of two Unio pictorum mancus (Mollusca, Unionidae) populations from two lakes of different trophic state

Ravera¹,

FREDIANI²,

Riccardi³

2007

J Limnol

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Samples of Unio pictorum mancus collected monthly from spring 2003 to summer 2004 in the meso-oligotrophic Lake Maggiore and the eutrophic Lake Candia were compared to evaluate the influence of lake trophic conditions on mussel populations. Shell form, maximum age (8 years) and percentage of organic matter in the shell and soft tissues were similar in both lakes. However, comparisons between same size classes revealed that mussels from Lake Maggiore were generally older, their shells heavier and their soft tissues lighter than those from Lake Candia. Recruitment occurred in both populations in June-July. The frequency distributions of adult mussels (>30 mm) and their soft tissues and shell biomasses in all size classes (range = 2 mm) were normal, but the curves of the mussels from Lake Candia were flat in comparison to those of mussels from Lake Maggiore. The median body size of Lake Maggiore mussels was 58 mm, while that of the Lake Candia population was 72 mm. During the study period the population density of each lake was fairly constant, whereas the population structure, and consequently the biomass, showed seasonal variations.

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Studies on Unionidae populations from the Crapina-Jijila complex of pools (Danube zone liable to inundation)

Cited by 40 publications

References 4 publications

Unionid bivalves  of the pilica river catchment area

Unionid bivalves  of the pilica river catchment area

Distribution, growth, production, and ecological significance of the clam Unio terminalis in Lake Kinneret, Israel

Seasonal variations in population dynamics and biomass of two Unio pictorum mancus (Mollusca, Unionidae) populations from two lakes of different trophic state

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Studies on Unionidae populations from the Crapina-Jijila complex of pools (Danube zone liable to inundation)

Cited by 40 publications

References 4 publications

Unionid bivalves of the pilica river catchment area

Unionid bivalves of the pilica river catchment area

Distribution, growth, production, and ecological significance of the clam Unio terminalis in Lake Kinneret, Israel

Seasonal variations in population dynamics and biomass of two Unio pictorum mancus (Mollusca, Unionidae) populations from two lakes of different trophic state

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Unionid bivalves  of the pilica river catchment area

Unionid bivalves  of the pilica river catchment area