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Ecological patterns of water bug (Hemiptera: Heteroptera) assemblages in karst springs : a case study from central Montenegro

Gligorović B., Savić A., Protić L., Pešić V.

Oceanological and Hydrobiological Studies

2016

Vol. 45, No. 4

554--563

The composition of water bug communities from 32 springs located in the central part of Montenegro was investigated. Twenty five species were identified, including 13 reported as new to Montenegro. The most common species were Hydrometra stagnorum and Velia sp. (Gerromorpha). Our study in the central part of Montenegro revealed that environmental and faunistic classification of karstic springs based on water bug communities may not correspond with each other. According to environmental characteristics, springs were divided into three groups indicating anthropogenic impact on the spring habitats. Water bug communities divided springs into four groups. There are differences in species richness between these four types of water bug assemblages and among the studied spring types. Results of CCA analysis revealed spring size as the main driver of biotic diversity of aquatic bugs in springs. Our study showed that community groups of water bugs specified in the biotic classification of spring habitats are much better defined than assemblages distinguished in the environmental site classification.

Minimum mean-squared error multi-user MIMO receive filtering

Spalević P., Stanković V., Stefanović M., Panić S., Savić A.

Przegląd Elektrotechniczny

2011

R. 87, nr 7

178-182

In this paper we use two modifications of the minimum mean-squared-error (MMSE) cost function to derive new multi-user (MU) MIMO receive algorithms. We derive algorithms that have lower complexity than the lattice reduction techniques and are able to extract full diversity inherent in the system. The resulting algorithms work in the overloaded systems, i.e. can process signals at the user terminals (UTs) equipped with the arbitrary number of antennas, and have no bit error floor.

W pracy wykorzystano dwie modyfikacje funkcji MMSE do otrzymania nowego algorytmu otrzymywania danych przez wielu użytkowników. Zaproponowany algorytm jest mniej złożony niż technika redukcji siatki i jest w stanie wydobyć różnorodność właściwą dla systemu. Możliwe jest przetwarzanie sygnału w terminalu użytkownika wyposażonego w dowolną liczbę anten.