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- Title
Zur Populationsökologie und Ethologie der Imagines von Cordulegaster bidentata an einem Waldbach im Taunus (Odonata: Cordulegastridae).
- Authors
Tamm, Jochen; Dressler, Bernd
- Abstract
At a small forest stream in the Taunus mountains, Hesse, Central Germany, 16 adult males of Cordulegaster bidentata were colour marked and both marked and unmarked individuals were counted during five days when passing the counting station. 69% of the marked males were observed again after the day of capture. Appearing males – marked and unmarked ones – carried out 193 passing flights along the stream, 27% of them were done by marked individuals. One can conclude that the population size was remarkable for this tiny stream. Flight activities were strongest in late morning and late afternoon. Among the patrolling males few individuals were frequently observed, others only occurred sporadically. On the nearby forest streams some more populations of C. bidentata were present, but no marked individuals could be found there. Single males of C. boltonii occurred along the flight way of C. bidentata. This uncommon phenomenon is described and discussed. Moreover, methodological questions of marking and population size calculation are discussed.
- Subjects
TAUNUS (Germany); POPULATION; ANIMAL behavior; FORESTS &; forestry; ODONATA
- Publication
Libellula, 2020, Vol 39, Issue 1/2, p1
- ISSN
0723-6514
- Publication type
Article