Wyniki wyszukiwania

1

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Study of the impact of polluted agroecosystem by sulphur compounds on Colorado potato beetle [Leptinotarsa decemlineata Say] and the occurrence of cannibalism among beetles of this species

100%

Przybylski Z.

Journal of Plant Protection Research

|

2001

|

tom 41

|

nr 1

The research was conducted to evaluate the impact of sulphur compounds on the sex of Colorado potato beetle in the region of sulphur factory in Chmielów near Tarnobrzeg in 1995. The control plantations were situated in the village of Zarębki, about 30km from Chmielów. The object of the study was the average body mass of female and male specimen of the insect after full spring beetle appearance in potato plantations as well as the average body female and male mass after pupation of the larvae of the first generation and emerging from the soil. After six and twelve days of starvation, the average female and male body mass was determined. After twelve days of starvation the incident of cannibalism was noticed among the beetles of the first zone polluted by sulphur compounds.

2

Experimental transmission of murine malaria by cannibalism on mice infected by Plasmodium berghei yoelii

100%

Malagon F., Castillo L., Tapia J. L.

Acta Protozoologica

|

1994

|

tom 33

|

nr 3

3

The effect of stock density on the effectiveness of rearing pikeperch Sander lucioperca [L.] summer fry

100%

Szkudlarek M., Zakes Z.

Archives of Polish Fisheries

|

2002

|

tom 10

|

nr 1

The aim of the experiment was to determine the effect of stock density on the growth, survival and cannibalism of pikeperch fingerlings held under controlled conditions in a water recirculation system and fed an artificial diet. The mean body weight of the fish at the start of the experiment was 0.65 ± 0.11 g and the total length was 4.54 ± 0.28 cm. The fish were divided into three experimental groups with the following stock densities: group A - 0.99g l⁻¹ ; groupB - 1.65g l⁻¹ ; group C - 2.31 g l⁻¹ . The rearing period was 42 days long and was divided into the adaptation and rearing proper periods. The results obtained from the experiment revealed that the initial density of pikeperch summer fry, which ranged from 0.99 to 2.31 g l⁻¹, had no effect on the final outcome of the rearing, i.e. neither on growth nor survival (ANOVA, P > 0.05). The final mean body weights for groups A, B and C were 9.43, 9.25 and 8.62 g, respectively, while total losses were 52.5, 56.1 and 56.1%, respectively. The high fingerling mortality during the adaptation period, i.e. from first to the fourteenth rearing day (group A - 40.8%, group B - 50.6%, group C - 44.1%), determined the effectiveness of rearing.

4

Sibling cannibalism in juvenile barramundi, Lates calcarifer (Actinopterygii: Perciformes: Centropomidae), reared under different light conditions

80%

Jesu Arockiaraj A., Appelbaum S.

Acta Ichthyologica et Piscatoria

|

2011

|

tom 41

|

nr 1

Background. Cannibalism occurs at various ages or sizes depending on fish species and the respective environments. Barramundi, Lates calcarifer (Bloch, 1790), is a popular and valuable species in aquaculture on the Asian and Australian continents. In its culture, cannibalism can cause severe losses during the early stages of development particularly before fish reach a length of about 10 cm. Hence the present study aimed to study the effect of the two photoperiods, constant darkness and continuous light on the rate of sibling cannibalism in barramundi juveniles reared indoors under intensive conditions. Materials and methods. The indoor experimental setup consisted of two separate systems labelled system 1 and 2. Each system consisted of three rectangular rearing tanks each of 60 L capacity connected to a mechanical and a biological water-cleaning unit. System 1 was kept under 24 h of light provided by two 36 watt fluorescent tubes. System 2 was kept under 24 h of darkness except for a short period of 6 min during each feeding time. Each rearing tank was randomly stocked with 187 juveniles. A commercial fish feed was provided to the fish by hand ad libitum four times during the day time. The experiment was conducted for 112 days. Results. In both light and dark systems, larger specimens were much more active during feeding, chasing smaller siblings away from the provided feed, leaving them only the remains to feed on. The accumulated observed mortality was similar under both dark and light conditions. In the present study although feed was provided ad libitum, cannibalism still occurred under both light and dark conditions. However, the rate of cannibalism was significantly (P < 0.05) lower under dark conditions. The results show that a potential predator can swallow a prey up to a maximum of 67% of its own body length. Similar growth performances were observed in the fish groups reared under dark and light conditions. Conclusion. The application of constant darkness is therefore a useful strategy in significantly reducing cannibalism when rearing barramundi. Furthermore, such a strategy also leads to the formation of a more uniform population of fish which is a desire of the grower.

5

Observations on cannibalism and feeding on dead arthropods in Scydmaenus tarsatus (Coleoptera: Staphylinidae: Scydmaeninae)

80%

Jaloszynski P.

Genus. International Journal of Invertebrate Taxonomy

|

2012

|

tom 23

|

nr 1

6

Size-structured interactions and the dynamics of aquatic systems

80%

Persson L., De Roos A. M.

Polish Journal of Ecology

|

2006

|

tom 54

|

nr 4

Size variation within species as a result of individual growth and development over the life cycle is a ubiquitous feature of many aquatic organisms. We review the implications of this size variation for the dynamics of aquatic systems. Ontogenetic development results in differences in size dependent competitive abilities between differently sized individuals giving rise to cohort cycles that are qualitatively different from traditional predator prey cycles. Size-dependent interactions also mean that the type of interaction – competitive or predatory – changes over the life cycle as a result of an increase in size. At the intraspecific level, cannibalistic interactions may, depending on the life history characteristics of the cannibal, give rise to either equilibrium or cycles driven by a mixture of inter-cohort cannibalism and competition. In multispecies contexts, size variation and particularly food dependent growth lead to the presence of alternative states involving catastrophic collapses. These sizestructured interactions have so far been mainly demonstrated for fish and cladocerans, but do have whole lake food web ramifications.

7

Effects of beak trimming on laying hens in small group furnished cages

80%

Croxall R., Elson A., Walker A.

Animal Science Papers and Reports. Supplement

|

2005

|

tom 23

|

nr 1

8

Feather pecking and cannibalism: Practical experiences to keep turkeys busy

80%

Frackenpohl U., Meyer H.

Animal Science Papers and Reports. Supplement

|

2005

|

tom 23

|

nr 1

9

Kanibalizm swin - przyczyny oraz mozliwosci zapobiegania

71%

Salach T.

Biuletyn Informacyjno-Handlowy. Ośrodek Doradztwa Rolniczego Boguchwała

|

2006

|

nr 01

14

10

Chorobliwe nawyki krolikow

71%

Zajac J.

Biuletyn Informacyjny. Instytut Zootechniki

|

1999

|

tom 37

|

nr 2

73-78

11

Chicks from synchronized groups show less feather pecking as adults

71%

Jensen A. B., Forkman B.

Animal Science Papers and Reports. Supplement

|

2005

|

tom 23

|

nr 1

Ograniczanie wyników

Study of the impact of polluted agroecosystem by sulphur compounds on Colorado potato beetle [Leptinotarsa decemlineata Say] and the occurrence of cannibalism among beetles of this species

Experimental transmission of murine malaria by cannibalism on mice infected by Plasmodium berghei yoelii

The effect of stock density on the effectiveness of rearing pikeperch Sander lucioperca [L.] summer fry

Sibling cannibalism in juvenile barramundi, Lates calcarifer (Actinopterygii: Perciformes: Centropomidae), reared under different light conditions

Observations on cannibalism and feeding on dead arthropods in Scydmaenus tarsatus (Coleoptera: Staphylinidae: Scydmaeninae)

Size-structured interactions and the dynamics of aquatic systems

Effects of beak trimming on laying hens in small group furnished cages

Feather pecking and cannibalism: Practical experiences to keep turkeys busy

Kanibalizm swin - przyczyny oraz mozliwosci zapobiegania

Chorobliwe nawyki krolikow

Chicks from synchronized groups show less feather pecking as adults