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Comparing Trophic Niches of Sympatric Raptors in Agricultural Landscape in Central Poland

Romanowski Jerzy, Lesiński Grzegorz

Polish Journal of Ecology

2019

Vol. 67, nr 4

331--338

According to basic ecological principle, species that share the same niche do not occupy the same environment for a long time, and sympatry of two or more such species provides an interesting field for the analysis of their trophic niche differentiation. To examine the potential differences in the dimensions of the trophic niche we studied the diet of three sympatric avian predators that prey on colonial Microtus rodents. The study area in central Poland is located in an agricultural landscape, composed of crop fields, as well as meadows and pastures located within a small river valley. The pellets of long-eared owl (Asio otus), barn owl (Tyto alba) and kestrel (Falco tinnunculus) were collected from the 750 m2 study site including church building and its surrounding in the spring of 2016 and 2017. The analysis of pellets provided data on a total of 4128 vertebrate prey individuals (1914 from barn owl, 1749 from long-eared owl, and 465 from kestrel). The most important prey group of all three predators were small mammals (90%, 14 species) and the most frequently preyed species was Microtus arvalis (making up 72% of vertebrate prey of long-eared owl, 59% of kestrel and 53% of barn owl). Despite the general similarity in the diet composition, there were differences in the contribution of several prey species (e.g. Soricomorpha, M. arvalis, Mus musculus, Rattus norvegicus, and Apodemus spp.) and the diversity of the diet between the predators. We conclude that the trophic niches of the studied sympatric species differ in several dimensions, including diel activity, prey size and taxon-specific feeding preferences.

Porównanie modeli hostowania aplikacji na platformie ASP.NET Core

Zdanikowski Kamil, Pańczyk Beata

Journal of Computer Sciences Institute

2018

Vol. 8

258--262

W artykule przedstawione zostało porównanie modeli hostowania aplikacji na platformie ASP.NET Core. Dostępne modele hostowania zostały opisane i porównane, a następnie przeprowadzone zostały ich testy wydajnościowe. Dla każdego modelu zastosowano scenariusze testowe realizujące te same funkcje, a ich wydajność została określona za pomocą liczby przetwarzanych żądań na sekundę. Uzyskane rezultaty wskazują, że standardowa konfiguracja jest najmniej wydajna, a zastosowanie innej, np. IIS z serwerem Kestrel, czy same serwery Kestrel lub HTTP.sys mogą zapewnić kilkukrotny wzrost wydajności w porównaniu z modelem standardowym.

The article presents hosting models comparison of ASP.NET Core application. Available hosting models were described and compared and then performance comparison was carried out. For each model the same test scenarios were executed and their performance was determined by number of requests per second which host was able to process. The results obtained show that standard model is the least efficient one and using one of the other configurations, for example, IIS with Kestrel (in-process), Kestrel or HTTP.sys might provide even several times better performance compared to standard model.