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LONGITUDINAL DITRIBUTION OF THE MAYFLIES (EPHEMEROPTERA) COMMUNITIES IN BUZÃU RIVER


OANA RISTEA, ANCA NEAGU, IONEL MIRON

Issue:

SCSB, Volume XI

Section:

Ecology, Limnology

Abstract:

According to Water Framework Directive 60/2000/EC, benthic macroinvertebrates become a priority in establishing of the surface water status. Among these, the mayflies (Ephemeroptera) have an important role in the evaluation of the physical, chemical and hydromorphological conditions of water flows. Mayfly taxa are widely accepted as bioindicators for water quality and ecological integrity (Bauernfeind & Moog, 2000).

In the course of their evolution, mayflies have adapted to certain hydromorphological conditions, therefore, knowing these conditions we can appreciate the population structure and vice versa, knowing the population structure we can appreciate their environmental conditions. That`s why, the mayflies as all macroinvertebrates are the most used indicators for the determination of the water quality, because they respond to a great number of characteristics such as altitude, bottom, velocity and physical-chemical parameters.

The BuzĂŁu River represents one of the most important tributary of the Siret River, with a length of 302 km (Fig 1).

The surface of the BuzĂŁu river basin contains three kinds of relief: mountains, hills and field, from the peaks of Penteleu to the BĂŁrĂŁgan plain.

The prevailing geological structure is a siliceous one, followed by an organic and a reduced calcareous structure.

The distribution of the precipitations and the temperature follow the great forms of relief. Thus, the annual mean precipitations vary from 400 mm/year to 1200 mm/year and the annual mean temperature from – 4 oC in the mountain to 10C in the plain.

Keywords:

mayflies, constance, dominance, Shanon-Wiener index, Simpson index, longitudinal distribution, saprobic valence.

Code [ID]:

SCSB200611V11S03A0007 [0002509]


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