LIGHT-TRAP CATCH OF THE FLUVIAL TRICHOPTERA SPECIES IN CONNECTION WITH THE GEOMAGNETIC H-INDEX
Journal of Biology and Nature, Volume 4, Issue 4,
The study deals with the change of light-trap catch of twelve caddisfly (Trichoptera) species of Danube and Tisza rivers in connection with the geomagnetic horizontal component (H-index). The numbers of specimens caught of all species were calculated relative catch values. These daily relative catch data were assigned to the daily values of geomagnetic field above 21,250 nT (H-index). We correlated the daily catch results pertaining to the daily values of geometric H-index values.
The catch of nine species increased in parallel with increasing values of the H-index, but the catch of two species declined. There was one species which has decreasing catch at River Danube, but it was increasing at River Tisza.
- geomagnetic horizontal component
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