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COMPARATIVE RESEARCHES ON THE STRUCTURE OF EPIGEAN FAUNA IN TWO TYPES OF NATURAL ECOSYSTEM AT POIANA SARATA, BACAU COUNTY, ROMANIA


ROXANA ELENA VOICU, CAMELIA URECHE
“Vasile Alecsandri” University of Bacau, Faculty of Science, Department of Biology, Ecology and Environmental Protection, 157 Marasesti Street, 600115 Bacau, Romania, e-mail: roxana.voicu@ub.ro; urechec@ub.ro

Issue:

SCSB, Number 2, Volume XXIV

Section:

Volume 24, No. 2

Abstract:

Researches regarding epigean invertebrates’ communities were carried out in the year 2011 in two types of natural ecosystem from Poiana Sarata (Bacau County, Romania): deciduous forest, and meadow hay. The first one is located on the left bank of the river Halos and the second one is on the right bank of it. This paper aims to assess the taxonomic structure of both habitats in ecological context. The biological material was sampled regularly during 2011, by using Barber traps, from the different types of sampling sites: from the middle part of the slope and from the base of the slope in deciduous forest, and from different distance from the river in the meadow hay. An amount of 8484 invertebrate individuals belonging to 8 classes and 17 orders was sampled in both ecosystems, with an unequal numerical distribution: 5702 individuals in deciduous forest and 2782 individuals in the meadow hay. Insect class is dominant in all of the sampling sites. Analyzing the biological material we found that in the deciduous forest, in the middle part of the slope, the dominant insect order is Coleoptera (54.48%), while at the base of the slope, the dominant insect order is Hymenoptera (48.48%), followed by Coleoptera (43.69%). In the two types of sampling sites in the meadow hay we found that Hymenoptera and Coleoptera are dominants and the Carabidae family is by far the best represented. We also found that the number of individuals increases with the distance from the river. Although a decade ago the anthropogenic influences were much stronger in the study area, the large number of taxa identified in 2011 together with the quantitative data indicates a balanced structure of the epigean fauna.

Keywords:

epigean, invertebrates communities, decidous forest, meadow hay.

Code [ID]:

SCSB201502V24S01A0008 [0004410]

Full paper:

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