Faunistic Analysis Research Articles

A Baseline Study on Benthic Species Distribution in Two Neighbouring Gulfs, With and Without Access to Bottom Trawling

Abstract. An extensive survey of the benthic fauna was carried out at two neighbouring regions of the Aegean Sea, one normally trawled and the other closed to trawlers. Benthic samples were collected from seven areas located away from land‐based sources. The faunistic analysis showed that species diversity and abundance was higher in the trawled area compared with the untrawled area, a fact which was attributed to the difference in sediment characteristics between the two areas. A degree of disturbance detected in the trawled area was evidenced by an increase in the number of polychaetes at the expense of other benthic groups and an abundance of some opportunistic species. This could possibly be related to trawling activities. as no other causes of disturbance were found in either area.

Ecosociological Relations of Groundbeetle Communities in several Oak Forests of Western Spain (Coleoptera: Carabidae)

In 1990, the activity of Groundbeetle communities was studied for 6 months in 4 experimental oak forests (Quercus spec) in the 'Sierra de Gata' mountains (Province of Salamanca) and another additional plot close to Salamanca city (Monovela). Using pitfall traps, a total of 3620 beetles belonging to 42 species were collected, which were divided out in 2 groups, 'frequent species' and 'less frequent species'. The relationships between these species and the characteristics of the area were established by using selected indexes. A faunistic and phenological analysis and the colonization of the different plots, emphasizing that some species of the genus Calathus Bonelli 1810 showed a clear preference for oak forests were also achieved.

ANÁLISE FAUNÍSTICA DOS PARASITÓIDES (HYMENOPTERA, BRACONIDAE) DE Anastrepha spp. (DIPTERA, TEPHRITIDAE) EM MANAUS E IRANDUBA, ESTADO DO AMAZONAS

Foram coletados 2 630 parasìtóides de Anastrephaspp., pertencentes a cinco espécies de Braconidae, em quatro locais de dois municípios do Estado do Amazonas. Optussp. foi a espécie predominante no estudo, ocorrendo com maior freqüência na área urbana de Manaus. Doryctobracon areolatus(Szépligeti, 1911) foi a espécie predominante nas áreas rurais. As comunidades foram delimitadas e caracterizadas através de índices faunísticos. As comunidades apresentaram quocientes de similaridade entre 82 e 100%.