engleski

Microhabitat preference and emergence patterns of Diptera (excluding Chironomidae) in the springs of Bijela rijeka and Crna rijeka, NP Plitvice.

Larval composition and emergence patterns of Diptera (excluding Chironomidae) were studied in the springs of Bijela rijeka and Crna rijeka in the Plitvice Lakes National Park. Samples of the larvae were taken monthly during 2007 using Surber sampler from all present substrates. Six pyramid-type emergence traps were placed on each site on different substrate types and samples were collected monthly through 2007. Overall, at both investigated sites species from 14 families were recorded. At spring of Bijela rijeka 13 species were found in Surber samples, whereas 20 species were identified from emergence traps. Similarly, at spring of Crna rijeka larvae of 14 species were collected, while 28 species were identified from emergence trap samples. Family Limoniidae was 33 represented with 5 and 12 species at the spring of Bijela rijeka and Crna rijeka, respectively, followed by Empididae represented with 6 species at both springs. Berdeniella sp. nov. (Psychodidae) was overall the most abundant species regarding both number of larvae and adults collected. Diversity and number of collected specimens were higher for the spring of the river Bijela rijeka, considering both sampling types (larvae and adults collected with emergence traps). One-way ANOVA showed that Berdeniella sp. nov. (Psychodidae) preferred moss as larval habitat at both sites and also its emergence from that substrate was highest. Larvae of Dicranomyia didyma (Limoniidae) preferred sand while adults did not show any preference towards emerging from particular substrate type. Differences in number of specimens and Diptera species at these two springs can be contributed to the differences in their canopy, because spring of Bijela rijeka has an open canopy while the canopy at spring of Crna rijeka is closed.

Spring Emergence; Diptera;

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