Summary of data from Dragonflies monitoring transect

Posted by Rossen
 

Transect: Struma River near Blagoevgrad (41 58'46.72 N 23 4'21.91 E)

In 2012 for the second consecutive year I had the opportunity to conduct monitoring of dragonflies with methodology developed for the Netherlands and adapted to local conditions in the country. Survey period was from March to December, as collected interesting data for the number and flight period of the species.

The Transect is one kilometer in length along the right bank of the river. In this area the river flows slowly and form branches. At high water the river spills over a large area and form a small riverside marshes, which dry up during drought. The riparian vegetation is dominated by Tamarix tetrandra as individual trees are white willow and hybrid poplar.River banks are covered with hygrophytes (Typha sp., Sparganium erectum, Butomus umbellatus, Rorippa amphibia) and in riverside marshes and some sections of the river develops hydrophytes of Lemna minor, Ceratophyllum demersum and Potamogeton sp.. In some areas the river banks is sandy with scarce vegetation.

Recorded species

Flaight period

J

F

M

A

M

J

J

A

S

O

N

D

Calopteryx splendens

Y

Y

Y

Y

Y

Sympecma fusca

Y

Y

Y

Erythromma najas

Y

Y

Y

Erythromma viridulum

Y

Y

Y

Y

Erythromma lindeni

Y

Y

Y

Coenagrion scitulum

Y

Y

Y

Coenagrion puella

Y

Y

Y

Ischnura elegans

Y

Y

Y

Y

Y

Y

Y

Platycnemis pennipes

Y

Y

Y

Y

Y

Aeshna isoceles

Y

Y

Y

Aeshna affinis

Y

Aeshna mixta

Y

Y

Y

Anax imperator

Y

Y

Y

Y

Y

Gomphus vulgatissimus

Y

Y

Onychogomphus forcipatus

Y

Cordulia aenea

Y

Libellula depressa

Y

Y

Y

Orthetrum albistylum

Y

Y

Y

Y

Y

Orthetrum brunneum

Y

Y

Y

Crocothemis erythraea

Y

Y

Y

Y

Y

Sympetrum striolatum

Y

Y

Y

Y

Sympetrum meridionale

Y

Y

Sympetrum fonscolombei

Y

Sympetrum depressiusculum

Y

Y