Data/hora: 11/06/2024 05:37:29

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 09/10/2008
Data da última atualização: | 09/10/2008
Autoria: | SCHLAGHAMERSKÝ, J.; ?ÍDOVÁ, A.
Título: | Population dynamics and vertical distribution of a population of Hrabeiella periglandulata (Annelida) in South Moravia (Czech Republic).
Ano de publicação: | 2008
Fonte/Imprenta: | In: INTERNATIONAL COLLOQUIUM ON SOIL ZOOLOGY, 15; INTERNATIONAL COLLOQUIUM ON APTERYGOTA, 12., 2008, Curitiba. Biodiversity, conservation and sustainabele management of soil animal: abstracts. Colombo: Embrapa Florestas. Editors: George Gardner Brown; Klaus Dieter Sautter; Renato Marques; Amarildo Pasini. 1 CD-ROM.
Idioma: | Inglês

Conteúdo:

Hrabeiella periglandulata is one of only two truly soil-dwelling, non-clitellate annelids known so
far. Since its description in 1984, its unclear systematic position among the ?Polychaeta? and
relationship to the Clitellata have provoked several studies. Little is known about its ecology and
geographic distribution. Records have been published from Europe only, showing a range from
southern Sweden, accross central Europe (Germany, Czech Republic and Poland) to central
Italy. The present study reports on a population found in the municipal forest of the city of Brno
(South Moravia, Czech Republic) during a study on enchytraeids commenced in late 2003.
Except a locality in south-eastern Poland this is the eastern-most published record of the species,
thus shifting the border of the known range further to the south-east. The objective of the present
study was to provide data on the density, population dynamics and vertical distribution of this
population of H. periglandulata. Comparable data have only been published from a few sites in
south-western Germany.
In the municipal forest at Brno the species was originally found in three of four circular plots (177
m2 each) investigated, the soil being illimerized podsol of silt loam texture, with a pH (H2O) in
the upper mineral soil between 3.9 and 4.4.. Two of the plots were covered by a mixed stand of
deciduous and coniferous trees, two other plots by coniferous stands only. H. periglandulata
was missing in one of the latter and was only abundant in one of the mixed stands (pH 4.4). All
plots were sampled monthly from Dec. 2003 to Nov. 2004. In the plot with highest densities
monthly sampling was continued until Nov. 2005, with three additional samplings up to Jan.
2007. Six soil cores of 17 cm2 surface area and 12-15 cm depth were taken per plot and date
and vertically subdivided into layers. H. periglandulata specimens were extracted from these
subsamples by a modified O?Connor wet funnel method. The two year study of H. periglandulata
in the plot where it reached highest abundance showed the lowest mean density of 196 ind./m2
in Sept. 2005 and a highest one of 11 863 ind./m2 in June 2005. Density maxima were reached
in May 2004 and June 2005, with lows in both years from August to October or even November.
Due to the highly aggregated horizontal distribution many of the monthly values did not differ
significantly, however, the observed trend in population dynamics corresponded to the climatic
development during the study period, showing particularly the negative effect of the droughts at
the end of the summer. The observed population dynamics differed from those in south-western
Germany (with minima in early summer and maxima in winter). The studied population showed
a very even distribution in the upper soil profile down to ca. 15 cm, only avoiding the organic
layer. This was remarkable as the lower part of the soil cores consisted of very fine, silty mineral
soil with very little organic matter.
The study was conducted under Masaryk University?s Research Plan MSM 0021622416.

Categoria do assunto: | --
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (43880-1) - UPE - PL - -- - CD0305 -  -  - DIS