Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Polish Journal of Ecology

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Impact of Taxonomic Resolution on the Indicatory Information : Studies on Carabid Beetles in Poland

Schwerk A., Dymitryszyn I.

Polish Journal of Ecology

2016

Vol. 64, nr 2

255--267

The informative power of species surrogacy with respect to ecological processes and anthropogenic influences has been rarely studied. Thus, five datasets on carabid beetles collected using pitfall traps were analysed in order to study the impact of changing the taxonomic resolution from species to genus level on their indicatory information: a dataset of eight study sites in differently managed habitats sampled in 2013, a dataset tracing successional changes from 2004 to 2013 in a naturally regenerated pine forest, a dataset of three sites on a heap of power plant ashes and a dataset of four sites on a colliery spoil heap, both sampled from 2004 to 2011, and a dataset of six sites along the roadside of a highway being renovated in 2009, sampled in 2008 and from 2010 to 2012. The datasets were analysed by studying correlations of species numbers with genus numbers and species based Shannon diversity with genus based Shannon diversity, testing compliance between species based and genera based similarity matrices, and comparing the information provided by ordination diagrams based on species information or genus information respectively. The results indicate that at least in our study a substantial amount of information provided by species data is still contained in the genus data, but information about fine graded differences between study sites gets lost. We conclude that, even if carabid genus information might be useful in some cases (e.g. preliminary biodiversity assessment), the limitation to higher taxonomic levels like the genus level has to be done with caution.

Nocturnal activity of Carabus hortensis L. (Coleoptera, Carabidae) in two forest sites studied with harmonic radar method

Szyszko J., Gryuntal S., Schwerk A.

Polish Journal of Ecology

2005

Vol. 53, nr 1

117-121

The paper deals with a study of the nocturnal activity rhythm of Carabus hortensis L. with applying a harmonic radar system. Beetles withh a diode attached to their elytra were set into the terrain and tracked by help of a portable radar. The studies were carried out in a pine forest in which Carabus hortensis L. occurs regularly and in a beach forest in which this species was completely absent. The data show that Carabus hortensis L. is active mainly at the first hours after sunset, independently from time of sunset. A small peak of activity exists at about 9 - 10 hours after sunset. The nocturnal activity rhythm is similar in both forest sites, but the individuals show significantly higher activity in the beech forest. Based on the assumption that activity is connected with hunger level, the total activity may be useful as indicator of habitat quality (feeding conditions) for Carabus hortensis L.