<abstract xmlns="http://www.w3.org/1999/xhtml"><p> Aeshna caerulea (Azure Hawker) is present as a post-glacial relict in central European mountains. This species is listed as critically endangered in the Czech Republic (very restricted distribution occurring in two isolated populations) and the European population trend of this species is decreasing. The main objective of the study was to estimate the population size of A. caerulea in the Úpa bog National Nature Reserve (Czech Republic) using capture-mark-recapture data. Population estimates of adults using the Schnabel method was 425 (the 95% confidence limits: 248.1 / 992.3), and using the Schumacher-Eschmeyer method was 416 (the 95% confidence limits: 326.8 / 570.4). Imago activity became apparent at the beginning of July. This study has suggested that the possible future threats for the A. caerulea in the Czech Republic are drying up, air nitrogen depositions, eutrophication, pollution of water by external sources, and terrestrification, mainly as a result of global warming.</p></abstract>

Aeshna caerulea (Azure Hawker) is present as a post-glacial relict in central European mountains. This species is listed as critically endangered in the Czech Republic (very restricted distribution occurring in two isolated populations) and the European population trend of this species is decreasing. The main objective of the study was to estimate the population size of A. caerulea in the Úpa bog National Nature Reserve (Czech Republic) using capture-mark-recapture data. Population estimates of adults using the Schnabel method was 425 (the 95% confidence limits: 248.1 / 992.3), and using the Schumacher-Eschmeyer method was 416 (the 95% confidence limits: 326.8 / 570.4). Imago activity became apparent at the beginning of July. This study has suggested that the possible future threats for the A. caerulea in the Czech Republic are drying up, air nitrogen depositions, eutrophication, pollution of water by external sources, and terrestrification, mainly as a result of global warming.

Population size estimation of Aeshna caerulea (Odonata: Aeshnidae) in the Czech part of Úpské rašeliniště bog (Giant Mountains)

Department of Biology and Ecology/Institute of Environmental Technologies, Faculty of Science, University of Ostrava, Chittussiho 10, CZ-710 00 Ostrava

Acta Musei Silesiae, Scientiae Naturales

Aeshna caerulea (Azure Hawker) is present as a post-glacial relict in central European mountains. This species is listed as critically endangered in the Czech...

Population size estimation of Aeshna caerulea (Odonata: Aeshnidae) in the Czech part of Úpské rašeliniště bog (Giant Mountains)

Published Online: Aug 14, 2013

Page range: 83 - 89

DOI: https://doi.org/10.2478/cszma-2013-0008

Keywords
Dragonfly conservation, Aeshna caerulea, Odonata, Population estimates, Glacial relict, Peat-bog

This content is open access.

Population size estimation of Aeshna caerulea (Odonata: Aeshnidae) in the Czech part of Úpské rašeliniště bog (Giant Mountains)

Published Online: Aug 14, 2013

Page range: 83 - 89

DOI: https://doi.org/10.2478/cszma-2013-0008

KeywordsDragonfly conservation, Aeshna caerulea, Odonata, Population estimates, Glacial relict, Peat-bog

This content is open access.

Keywords
Dragonfly conservation, Aeshna caerulea, Odonata, Population estimates, Glacial relict, Peat-bog