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- Title
Nachweise des Bachwechsels bei Cordulegaster bidentata und weitere Beobachtungen zu Raumnutzung und Verhalten bei einer Metapopulation im Taunus (Odonata: Cordulegastridae).
- Authors
Tamm, Jochen; Dressler, Bernd
- Abstract
At eight small forest streams in the Taunus mountains, Hesse, Central Germany, the spatial performance of a metapopulation of Cordulegaster bidentata was studied by seven observers using 16 colour-marked adult males. After marking, 969 individuals passing above seven streams were counted during nine counting days, among them 47 marked ones (5%). In spite of sparse appearance of marked males, seven were observed again after marking. Four of them did not appear on the stream, where they had been marked, but on other streams in the surroundings. Maximum range between the places of marking and re-observing was 1,125 m. Most marked males only occurred sporadically at the streams. One can conclude that in general a remarkable proportion of male C. bidentata does not take part in regular patrolling flight activities along the streams. Moreover, male C. boltonii were common along two streams together with C. bidentata. This uncommon phenomenon is described and discussed.
- Subjects
SMALL forests; MOUNTAINS; RIVERS; METAPOPULATION (Ecology); ANIMAL populations
- Publication
Libellula, 2020, Vol 39, Issue 3/4, p19
- ISSN
0723-6514
- Publication type
Article