Dynamics and vertical distribution of a Hrabeiella periglandulata (Annelida) population in South Moravia, Czech Republic

The objective of this work was to evaluate the density, dynamics and vertical distribution of a Hrabeiella periglandulata population in a forest soil at Brno, Czech Republic. From December 2003 to November 2004, two plots covered by mixed stands and two covered by coniferous stands were sampled mont...

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Published in:Pesquisa agropecuaria brasileira 2009-08, Vol.44 (8), p.917-921
Main Authors: Schlaghamerský, Jiří(Masaryk University Faculty of Science Department of Botany and Zoology), ídová, Adéla(Masaryk University Faculty of Science Department of Botany and Zoology)
Format: Article
Language:eng ; por
Subjects:
AGRICULTURE, DAIRY & ANIMAL SCIENCE
AGRICULTURE, MULTIDISCIPLINARY
biologia do solo
fauna edáfica
Polychaeta terrestre
soil biology
soil fauna
terrestrial Polychaeta
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Summary:The objective of this work was to evaluate the density, dynamics and vertical distribution of a Hrabeiella periglandulata population in a forest soil at Brno, Czech Republic. From December 2003 to November 2004, two plots covered by mixed stands and two covered by coniferous stands were sampled monthly. Six soil cores per plot were taken down to 15 cm and subdivided into layers, which were subjected to wet funnel extraction. Missing in one of the coniferous stands H. periglandulata was abundant in the mixed stand with the highest soil pH. In this stand, monthly sampling continued until November 2005, with three additional samplings up to January 2007. Mean annual density was 2,672±1,534 individuals m-2. Population dynamics differed from those reported from Germany. Highest densities were reached in early summer, lowest between August and December. Due to aggregated horizontal distribution, differences between monthly values were often nonsignificant. No significant correlation with climatic data was found. Nevertheless, the observed dynamics corresponded to the climatic conditions, showing particularly the negative effect of drought. The population was evenly distributed in the sampled soil profile, only avoiding the organic layer. Except for a locality in Poland, this is the easternmost record of the species. O objetivo deste trabalho foi avaliar a densidade, a dinâmica e a distribuição vertical de uma população de Hrabeiella periglandulata em uma floresta de Brno, República Tcheca. De dezembro de 2003 a novembro de 2004, amostras de solo foram coletadas mensalmente, em duas áreas de floresta mista e duas áreas de floresta de coníferas. Em cada área, seis amostras de solo foram retiradas até a profundidade de 15 cm, subdivididas em camadas e colocadas para extração úmida em funil. Não encontrada em uma das áreas de floresta de coníferas, H. periglandulata foi abundante na área de floresta mista com pH do solo mais alto, onde a amostragem mensal continuou até novembro de 2005, com três amostragens adicionais até janeiro de 2007. A densidade média anual foi de 2.672±1.534 indivíduos por m². A dinâmica populacional diferiu da encontrada na Alemanha. As maiores densidades foram encontradas no início do verão, e as menores entre agosto e dezembro. Em razão da distribuição horizontal agregada, diferenças entre os valores mensais foram, frequentemente, não significativas. Nenhuma correlação significativa com dados climáticos foi encontrada. No entanto, as dinâmi
ISSN:0100-204X
1678-3921
1678-3921
0100-204X
DOI:10.1590/S0100-204X2009000800017