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Ecological peculiarities of the nesting and reproduction of Haematopus ostralegus longipes Buturlin, 1910 (Haematopodidae, Charadriiformes) in the course of the Medveditsa river (Saratov region)

The Haematopus ostralegus longipes population numbers in the conditions of the middle reaches of the Medveditsa river in the nesting period of 1996 – 2008 was stable, namely, 3 pairs, of which two, rarely three ones, nested annually. The egg laying size was 2–3 eggs. In the course of our many-year survey, a tendency has been established to significant reducing the reproduction success level against the background of transformations of the nesting and feeding stations, which is determined by the long-term tendency to reducing the water content in the river.

REGULARITIES OF THE RATIO OF THE SHELL LENGTH TO THE INDIVIDUAL WEIGHT OF MOLLUSKS FROM THE DREISSENA GENUS (DREISSENIDAE, BIVALVIA) IN THE VOLGOGRAD RESERVOIR

A regression analysis of the size and weight structure of the dreissenidae (D. bugensis and D. polymorpha) from the Volgograd reservoir was carried out. The power-dependence parameters in the resulting equation are different for the two mollusk species studied (W = 0.036L3.33 for D. bugensis and W = 0.064L3.32 for D. polymorpha). The established regression relationship between the individual body weight (W) and the mollusk’s shell length (L) has a high correlation degree: R2 = 0.96 for p = 0.01.

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