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Field and laboratory research was conducted to determine the effect of five herbicides on Rumex confertus Willd. which is the host of Gastroidea viridula Deg. and Gastroidea polygoni L. (Coleoptera: Chrysomelidae). Herbicide treatment effected plant growth, but new leaf rosettes were produced by the end of the summer. Survival, seasonal abundance and development of investigated insects were significantly...
The hypothesis, that shrews avoid intra- and interspecific aggression through a reduction of their loco-motor activity, was tested. In 55 neutral arena tests (each of 30-min-duration), 10 subadult individuals of Sorex minutus, 14 of S. araneus, 9 (including 1 adult male) of Neomys anomalus, and 13 of N. fodiens were used. Loco-motor activity and sum of conflicts (attacks, chases, escapes and threats)...
Rapid growth of rodent densities in forests of the Central Europe is associated with mast seasons of deciduous trees, mainly oak and beech. This increase is explained by more abundant food base, mainly acorns, also in spring and summer.
Field research was conducted to determine insects occurring on Rumex confertus Willd. The experiments were carried out in 1997, 1998, 1999 and additionally in 2001 from April to late September. The field trials were located in the natural habitat of R. confertus on meadows near Vistula river; in Bydgoszcz (53013'N, 18015'E) and Toruń (5302'N, 18061'E) vicinities. Mossy sorrel was injured by the following...
The study was carried out in the years 1998-2001 in Złotniki Experimental Farm. Observations included 82 female goats differentiated with respect to hornedness, age, breed and color. During the study period the animals were weighed seven times. The goats were observed in production conditions in groups arranged by goat-house workers. The number of animals in the observed groups was from 4 to 61. The...
Numerous authors indicate a significant role of chemical information (scent) left in the environment in communication between individuals in natural mammal populations. The basic functions of olfactory signals in small forest rodents are believed to include information related to reproduction: identification of sex, age, sexual status and social position of prospective sexual partners. It seems that...
The studies were carried out at the Experimental Station of the Agricultural University in Wrocław in 1998-2002. The aim of the study was to compare the species spectrum of hoverflies (Diptera, Syrphidae) collected by different methods. Four methods were applied: collection in yellow water traps, sweeping, direct collection, and rearing of the pupae collected directly from cultivated plants in the...
A computer aided semen analyzer (CASA) was used for monitoring some motility parameters of zebra mussel sperm after spawning for up to 1,5h at 22°C and after 24 hours of storage at 8°C. The mean percentage of motility (MOT) for sperm shortly after spawning was 70ą2.0 %, VSL = 31.8ą3.0 µm s-1, and VCL= 110.2ą6.4 µm s-1. The motility expressed as LIN was 27.7ą2.0 %, STR=44.5ą4.8 %, ALH=8.7ą2.0 µm,...
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