Mycoparasite Infection of Daphnia cucullata Sars, 1862 (Crustacea, Cladocera, Daphniidae) in Lake Pleshcheyevo (Yaroslavl Oblast, Russia)

2021 ◽  
Vol 14 (6) ◽  
pp. 792-796
Author(s):  
L. V. Voronin ◽  
S. M. Zhdanova
Keyword(s):  
Yaroslavl Oblast ◽  
Daphnia Cucullata

Septoria tormentillae. [Descriptions of Fungi and Bacteria].

2008 ◽  
Author(s):  
T. V. Andrianova
Keyword(s):  
Czech Republic ◽  
Great Britain ◽  
South Korea ◽  
Geographical Distribution ◽  
Conservation Status ◽  
Belgorod Oblast ◽  
Yaroslavl Oblast ◽  
Leningrad Oblast

Abstract A description is provided for Septoria tormentillae, which sometimes causes lesions on Potentilla erecta. Some information on its dispersal and transmission and conservation status is given, along with details of its geographical distribution (Asia (Armenia, Azerbaijan, China, Georgia, Kyrgyzstan), Russia (Primorskyi krai), South Korea), Europe (Belgium, Bulgaria, Czech Republic, Denmark, Estonia, Finland, France, Germany, Great Britain, Hungary, Ireland, Italy, Latvia, Lithuania, Netherlands, Norway, Poland, Romania, Russia (Belgorod oblast, Leningrad oblast, Oryol oblast, Pskov oblast, Yaroslavl oblast), Serbia, Slovakia, Sweden, Switzerland and Ukraine) and hosts (Ramularia grevilleana [syn. Ramularia arvensis] and Potentilla spp.).

Vertical distribution of pelagial zooplankton in a middle-sized dimictic valley reservoir

Biologia ◽  
2006 ◽  
Vol 61 (2) ◽  
Author(s):  
Martina Hudcovicová ◽  
Marian Vranovsky
Keyword(s):  
Vertical Distribution ◽  
Water Column ◽  
Seasonal Changes ◽  
Thermal Gradient ◽  
Summer Temperature ◽  
Zooplankton Abundance ◽  
Invertebrate Predation ◽  
Chaoborus Flavicans ◽  
Daphnia Cucullata ◽  
The Vertical Distribution

AbstractOur observations indicate the vertical distribution of zooplankton and its seasonal changes in Dubník II reservoir (Slovakia) are determined mainly by the thermal regime of the reservoir, by transparency, and by fish and invertebrate predation. During periods of circulation, zooplankton vertical distribution in the whole water column was more homogeneous, whilst during summer temperature stratification zooplankton concentrated in the epilimnion — rotifers in higher layers than crustaceans. During summer stagnation a steep thermal gradient occurred at the boundary of the epi-and hypolimnion and low temperature and low dissolved oxygen in hypolimnion offered a refuge for Chaoborus flavicans larvae against fish, enabling coexistence of vertebrate and invertebrate predation. This evidence supports our previous findings concerning dominance of rotifers in zooplankton and representation of crustaceans by small-bodied species in the study reservoir. Steep thermal gradient and the presence of Chaoborus larvae caused very low zooplankton abundance in the lower part of the water column and a reduction of cladocerans refuges against fish to layers of thermocline or closely under thermocline where Daphnia cucullata and Daphnia parvula were found. Our previous assumptions about the high density of zooplanktivorous fish in Dubník II reservoir are supported by the fact that these small cladocerans are represented by smaller individuals in the upper layers and bigger individuals in deeper layers.

Interspecific hybridization in sympatric species of Daphnia inhabiting lakes in northeastern Poland

2012 ◽  
Vol 41 (2) ◽  
pp. 1-6 ◽  
Author(s):  
Tomasz Brzeziński ◽  
Jan Fronk ◽  
Joanna Trzcińska-Danielewicz ◽  
Piotr Dawidowicz
Keyword(s):  
Interspecific Hybrids ◽  
Sympatric Species ◽  
Total Abundance ◽  
Daphnia Galeata ◽  
Daphnia Longispina ◽  
Complex Deficiency ◽  
Daphnia Longispina Complex ◽  
Northeastern Poland ◽  
Daphnia Hyalina ◽  
Daphnia Cucullata

AbstractPopulations of three sympatric species (Daphnia cucullata, Daphnia galeata, and Daphnia hyalina (Daphnia longispina complex)) inhabiting three lakes in northeastern Poland (Roś, Mikołajskie, Wigry) were checked for interspecific hybrids. Hybrid Daphnia coexisting with parental individuals were detected in each of the investigated lakes. Several classes of hybrids (F1, F2, backcrosses), including D. cucullata×galeata×hyalina individuals, have been detected. Hybrids constituted a substantial (13%–38%) part of the total abundance of individuals of the D. longispina complex. Deficiency of heterozygotes (hybrids) detected may indicate the existence of barriers for gene flow between the sympatric Daphnia taxa.

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