Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 25

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  feeding preference
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
In the experiments the lifetime, survival and feeding preferences of Sitona lineatus L. on the various broad bean cultivars were investigated. The measures of the injured disks were performed by means of automatic image analysis. This method led to reduction of time required for the measures. Based on these experiments it can be suggested that Hangdown Zielony was the most preferable and suitable cultivar for the S. lineatus adults from all tested broad bean cultivars. The largest injured disk surface, the longest life and the highest survival of Sitona weevils were recorded on this variety.
Grazing preferences of collembolans Ceratophysellasp. 1 were noted. The collembolans feed on the sporangia of Pseudoperonospora cubensisgrowing on plants Cucumis sativusin greenhouses in Esfahan province in Iran. Sporangia of Pseudoperonospora cubensiswere the preferred food of all fungal species noted in the alimental tract of the springtails. All digestive tracts of the springtails contained sporangia of P. cubensis.
Examination of fish in the diet of Cormorants (pursuit divers) and Yellow-legged gulls (surface plungers) in colonies in an area adjacent to fish-ponds was carried out in 2000-2003. The examined colony of Cormorants consisted of 41-45 nests and that of the Yellow-legged Gulls – 41-90 nests during the study. The diet of Yellow-legged Gulls in freshwater habitats is not well known. The prey of Cormorants consisted of only seven species of fish. Carp was the most numerous prey at 69% of consumed fish. Fourteen species of fish were recorded in the food of the Yellow-legged Gulls with the domination of carp (38%) and roach (34%). Rheophilous fish made up 5-19% of food by number. Both species caught large fish, but generally Cormorants caught on average larger fish. The same pattern was confirmed when carp was compared. The mean prey size of the Cormorants was 20.6 cm in total length (range 7-41 cm) and that of Yellow-legged Gulls 18.5 cm (range 9-47 cm). Fish are the principal food item for both Cormorants and Yellow-legged Gulls in the studied sites in southern Poland.
Evaluation offruits and leaves ofseventeen apple cultivars in respect of their attraction as food for caterpillars of leafroller species occurring in an experimental apple orchard was carried out over 1995 to 1998 in the Institute ofPomology and Floriculture at Skierniewice. The highest levels ofinjuries were observed on two cultivars: ‘Ligol’ and ‘Elstar’. High number ofinjured fruits was noted on the following cultivars: ‘Gala’, ‘Jonagold’, ‘Cortland’, ‘Idared’, ‘Lodel’ and ‘Szampion’. By far the number of injured fruits was lower on ‘Lobo’ and ‘Jonathan’, and the least on ‘Rubinette’, ‘Starkrimson’ and ‘Gloster’. Significant differences in the number of caterpillars settled down in leaf/flower clusters ofparticular cultivars during the vernal period were also confirmed. In each season the highest number ofcaterpillars of Pandemis heparana and Archips rosana were observed on leaves of‘Alwa’. To cultivars whose leaves were also readily settled down by the two aforementioned species were: ‘Jonathan’, ‘Cortland’, ‘Ligol’, ‘Lobo’, ‘Jonagold’ and ‘Elstar’. Relatively less caterpillars were observed on leaves of‘Arlet’, ‘Gloster’, ‘Szampion’, ‘Starkrimson’, ‘Pilot’, ‘Pinowa’ and ‘Rubinette’.
Fresh faeces of dormice found in nestboxes along the permanent transect in Białowieża Forest were analysed. The study area was a managed forest of diverse biotopes. In total, 196 samples of faeces of the forest dormouse (Dryomys nitedula) and 62 of edible dormouse (Glis glis) were examined. In the faeces analysed, the following categories of food remains were distinguished: chitin carapaces, calcareous shells, feathers, seeds, plant fibres. In the forest dormouse, chitin carapaces were found in 100% of samples, but in only 8% of the edible dormouse samples. Feathers were noted in 36% of samples of forest dormouse faeces, but only in 12% of samples from the edible dormouse. Calcareous shells were found in 14% of forest dormouse samples and 1.6% of edible dormouse faeces. Remains of animal food were found in 100% of samples of forest dormouse excrements, but only in 29% of samples from the edible dormouse. The highest percent of faecal samples with animal remains was found in the edible dormouse in July, while in the forest dormouse seasonal variation occurred only in some types of animal remains. Most of the chitin carapaces identified in forest dormouse faeces came from Chilopoda (45%), Hemiptera (33%) and Coleoptera (22%). In faeces of the edible dormouse the majority were remains of butterflies (55%). The results presented here suggest an almost total separation of the food niches of the two dormouse species.
Susceptibility of different sugar beet cultivars to larva damage caused by the third generation of beet fly (Pegomya hyoscyami Panz.) was tested in the field condition in 2008 and 2009. The effect of the pest damage on yield was estimated. Twenty four cultivars were tested in one location in 2008 (Piołunowo). Ten cultivars were tested in four locations in 2009 (Tytlewo, Tylice, Piołunowo, Zbójno). Experiments were designed by randomized blocks in four replications. Estimation of damage was done in the end of September using a six degree scale where: 1 – means very slight damage, 5 – heavy damage. The level of infection was calculated as a percentage. Yield was estimated on each plot by digging beets from 10 m2 area. Analysis of variance and correlation was done at p < 0.05. Significant differences in susceptibility of sugar beet cultivars to damage cause by beet fly larvae were stated. The level of damage ranged from 10% (cultivar Balladyna) to 45% (cultivar Picasso) in 2008. Six cultivars was weakly damaged, sixteen moderately, and two strongly. No significant correlation between leaf damage and root yield (r = 0.194, N = 24, p = 0.928). The average damage level was from 12% (cultivar Nancy) to 36.6% (Aldona) for four experiments in 2009. Damage level was week for two cultivars, moderate for six, and strong for two. Lack of correlation between root yield and damage level was stated. The obtained results revealed that sugar beet protection against the third generation of P. hyoscyami is pointless in case of a low or moderate level of damage.
The following rose species: saltspray rose (Rosa rugosa) and wild rosa (Rosa canina) were subjected to the studies on primary host acceptance by rose-grain aphid (Metopolophium dirhodum). The results of performed observations in the estern part of Poland revealed that the species R. rugosa was more preferred as a primary host by rose-grain aphid as compared to R. canina. First fundatrices of M. dirhodum on saltspray rose were recorded in the end of March. The dynamic development of rose-grain aphid populations were observed in May, and its maximum was in the middle of the month. In the third decade of May, numerous alatae of M. dirhodum appeared to start a spring migration to summer secondary host plant.
Based on the recent international discussions on environmental risk assessment (ERA) for genetically modified (GM) plants, the carabids’ community of maize fields were choosen for establishing and developing a methodology to select a proper bio-indicators. The GM maize varieties expressing toxin Cry 1 and Cry 3 may differently affect biology of carnivorous and phytophagous carabids and the flow of the toxin between trophic levels. Two criteria were used to select carabid species for the future standard laboratory tests: (a) prevalence in the communities of two experimental maize fields in central and south-eastern Poland as compared to Czech and (b) their food preference.
W badaniach wykorzystano 10 odmian grochu zarejestrowanych w Polsce. Postacie dorosłe oprzędzika pręgowanego przy wyborze pokarmu kierowały się bodźcami wizualnymi lub zapachowymi, lub też obydwoma jednocześnie. Do odmian preferowanych można zaliczyć Karat, Koral i Aster, a do niepreferowanych - Legendę, Mihan i Hamil. Najdłużej żyły chrząszcze karmione odmianami Legenda i Perkun, najkrócej - odmianami Jaran i Ramir.
The aim of the conducted experiments was to verify to what degree different lime species as well as other trees and shrubs may be potential host plants for oak slug sawfly. In the laboratory experiment a total of 45 plant species were tested, including 30 species and the taxa of lime. As a result of these studies significant information was obtained on which species may be seriously damaged by larvae of oak slug sawfly and resistant lime species were identified for potential use in green areas.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.