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Balwois 2010 LARVAE OF ODONATA AS INDICATORS OF WATER POLLUTION IN SHKODRA LAKE

Balwois 2010 LARVAE OF ODONATA AS INDICATORS OF WATER POLLUTION IN SHKODRA LAKE Arjana Striniqi Laçej, Kastriot Misja, Jakov Oga. Odonata insects , or dragonflies are one of the most conspicuous water insects that serve as bio-indicators of hydro-systems.

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Balwois 2010 LARVAE OF ODONATA AS INDICATORS OF WATER POLLUTION IN SHKODRA LAKE

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  1. Balwois 2010 LARVAE OF ODONATA AS INDICATORS OF WATER POLLUTION IN SHKODRA LAKE Arjana Striniqi Laçej, Kastriot Misja, Jakov Oga

  2. Odonata insects, or dragonflies are one of the most conspicuous water insects that serve as bio-indicators of hydro-systems. They are classified into two groups: Zygoptera and Anizoptera. Their larvae inhabit water, while their adults live on earth (Silsby, 2001). Odonata insects prefer oxygenated and clean running water habitats and as such they are efficient biological indicators of environmental pollution

  3. The Map of Shkodra Lake

  4. The research was carried out in the region around Shkodra Lake, basically in two areas (Shirokë and Kamicë), spring and autumn (2007 – 2009). Surveyed the Ecological Conditions of the habitats, to evidence anthropogenic factors that affect the conditions of the Enthomofauna of the water.

  5. We used water nets to catch dragonflies, as flying insects, wherever they were: in the surface of waters or on water plants. We bottled them in suspensions that contained 75% alcohol and some drops of distilled alcohol. The adults were carried in suitable containers in the form of boxes The material was examined in a stereomicroscope by making use of the defining keys

  6. Distribution of numbers of species and percentage of species according to Odonata groups

  7. Distribution of numbers of families and percentage of families according to Odonata groups

  8. Distribution of numbers of genera and percentage of genera according to Odonata groups

  9. Distribution of numbers of species, families and genera and their percentage according to Odonata groups

  10. Chart of relation for number of species and genera according to Odonata families

  11. Conclusions This study brings forth evidence on Odonata insects that are represented by 9 families, 15 gene types and 38 kinds. Anizopteras, as more variable species, are represented by 22 kinds, 5 families, 8 gene types. The families with the highest number of genes are F. Caemagrionidae (Zygoptera) and F. Libellulidae (Anizoptera), with three genes each. The gene types with the highest number of kinds are: Gj. Orthetrum, Gj. Aeschna, Gj. Sympetrum, and Caemagrion each of which consists of 4 kinds.

  12. The chemical condition of Shkodra Lake is assessed to be a good one on the basis of the analysis of its physic-chemical and chemical features, but it is assessed as good to moderate on the basis of the analysis its biological elements. This study reveals the different kinds of Anyzopters to be more diverse than those of Anizopters. A careful consideration of the intense asymmetric development of their wing nerves leads to the conclusion that the lake waters, where they dwell, are polluted. This fact makes us think that no matter how small the pollution of Shkodra Lake is, it should be continuously monitored.

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