Marisia - Maros Megyei Múzeum Évkönyve 29-30/2. (2010)
Zoology
Faunistic and ecological research on the Chrysomelidae (Coleoptera) family in the upper basin of the Mures River with special _______________________________ reference to the representation of the Chrysomelid subfamilies within the researched habitats ______________________________ with 1221 individuals and 61 species, the underwoods with 919 individuals and 60 species, the low-density forests with 553 individuals and 54 species, the pastures with 327 individuals and 41 species, the ruderal vegetation with 233 individuals and 23 species, the glades with 215 individuals and 32 species, the swamps with 186 individuals and 32 species, respectively artificial landscapes with 48 individuals and 9 species (Fig. 4). The analysis on the distribution of species in forests and herbaceous habitats shows that the vegetation layer of the natural ecosystems ensures the development of chrysomelids through the presence of host plants. One may find that most specimens were collected from grass flora (mesophilic meadows). Thus, the most representative populations within the researched habitats belong to the Chrysomelinae and Hal ticinae subfamilies, but within this the wooden species (forest), respectively the grassy ones (grassland) are disproportionately represented, namely 90.38% (Halticinae) and 65.38% (Chrysomelidae). The survey on the ecologic diversity of the chrysomelid population identified in the upper sector of the Mure? River has allowed us to reflect upon the degree of stability of the studied biocoenosis (Table 2). For the calculation of the ecologic diversity we have used the Shannon-Wiener index from which we have deducted also the value of relative diversity that is the equitability index. The highest value of the ecologic diversity and equitability index was registered in case of the mesophilic meadows (H= 1.35; e= 0.91), followed by the riverside coppice (H= 1.11; e= 0.80) and the deciduous forests (H=1.03, e = 0.75), densely populated habitats by chrysomelid species. Table 2: Ecological diversity and equitability index values of the studied habitats within the upper basin of the Mures River _________________Habitat_________________ Shannon - Wiener Index _________Equitability_________ Mesophile grassland_________________ 1.35 0.91 Meso-xerophilous Meadows______________________0,41___________________ 0.38 ____Meso-xerophilous Meadows__________ 0.58 0.51 ____Spruce forests______________________ 0.38 0.34 ____Coniferous forests with deciduous_____ 0.69 0.49 Beech forests_______________________ 0.59 0.53 Deciduous forests___________________ 1.03 0.75 Pasture________________________________________0,68_________________________0.33____________ Glades________________________________________0,65_________________________0.43___________ Low-density forests_________________ 0.55 0.38 Riverside coppice___________________ 1.11 0.8 Marshes 0.99 0.41 Underwoods 0.69 0.61 ____Ruderal vegetation__________________ 0.59 0.47 Artificial Landscapes________________ 0.21 0.22 Ihe lowest values were recorded in artificial landscapes (H = 0.21, e = 0.22) and spruce forests (H = 0.38, e = 0.38). The anthropogenic effect is at its maximum within artificial landscapes, so that the majority of species occur accidentally and the population structure is subject to a permanent alteration. In case of spruce forests the grassy vegetation layer is poorer in host plant species for chrysomelids and the forests do not provide optimal nutrition and reproduction conditions for many chrysomelid species. 75
