Life cycle and population structure of the tiger beetle Cicindela hybrida L. (Coleoptera: Cicindelidae)

Simon-Reising, EM.; Heidt, E.; Plachter, H.

Deutsche Entomologische Zeitschrift 22 November; 432: 251-264

1996


ISSN/ISBN: 1435-1951
DOI: 10.1002/mmnd.19960430209
Accession: 021284322

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Abstract
The tiger beetle Cicindela hybrida is common on bare ground habitats in Central Europe. Its population structure was studied in a German sand dune region. This region is partly forested and partly used as arable land. Only four small isolated dune areas still persist, two of which had been restored in 1989. Bridging a distance of 600 m, C. hybrida colonized one of the newly restored areas immediately. The other newly restored area is very small and surrounded by a forest. It has not been colonized since the end of 1990. Larvae and adults exclusively use bare patches without denser vegetation. Even shading by single trees deteriorates habitat quality. Small scale migration between adjacent patches is usually rare but increases significantly at specific periods of the year. Male home range is significantly larger than that of females. Most individuals need two vegetation periods to mature. Two generations follow one another in the course of one vegetation period. Therefore, different developmental stages of C. hybrida hibernate and are present simultanously during spring and summer. This desynchronized phenology is considered to be an adaptation to an "unpredictable" environment, thus minimizing the risk of local extinction.