Data/hora: 02/06/2024 15:46:52

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 08/10/2008
Data da última atualização: | 08/10/2008
Autoria: | PI?L, V.; SCHLAGHAMERSKÝ, J.; TRÍSKA, J.
Título: | The effects of polycyclic aromatic hydrocarbons on terrestrial annelids in urban soils.
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:

The impact of soil pollution on terrestrial annelids was investigated in two public parks in the city
of Brno (Czech Republic). One of the major group of pollutants emitted by motor vehicles are
polycyclic aromatic hydrocarbons (PAHs). The soil fauna of urban greens is therefore particularly
exposed to these pollutants. The objective of our study was to assess the contents of PAHs in
soil and their effects on the communities of enchytraeids and earthworms. In addition, PAH
concentrations in soil were compared with those in animal tissues. Two lawns, both adjacent to
a street with high traffic intensity, were selected as sampling sites. Samples were taken in 1 m,
5 m and 30 m distance from the street in spring and autumn 2007 (two transects per lawn and
sampling date). Each sampling point included three or four adjacent soil cores for enchytraeid
extraction (depending on soil moisture and thus enchytraeid abundance) and one earthworm
sampling point using the electrical octet method. Enchytraeids were extracted from the cores by
the wet funnel method (without heating). The obtained specimens were counted and identified.
A part of the obtained specimens was used for PAH analysis. These specimens were depurated,
freeze-dried, weighted and processed for atomic absorption spectrophotometry. The contents
of 16 PAHs were determined. Further, two sets of soil samples were taken to analyse basic
chemical parameters and PAH contents, respectively.
The content of PAHs in soil ranged from 3.2 to 17.65 mg/kg and decreased with the distance
from the street (ANOVA, F = 3.98, p = 0.05). Four species of earthworms were recorded, among
which the anecic Lumbricus terrestris and the endogeic Aporrectodea caliginosa highly
predominated. Earthworm density tended to increase from the street edge towards the centre
of the park, with mean values of 114, 186 and 218 ind./m2 in the distance of 1, 5 and 30 m,
respectively. However, the differences were insignificant (ANOVA, F = 0.79, p = 0.48). The
enchytraeid community was dominated by Henlea ventriculosa, Enchytraeus buchholzi s.l., three
Achaeta species and Fridericia spp., particularly F. hegemon. Enchytraeid densities in spring
were very low, with mean values of 4010, 1620 and 1580 ind./m2 in the distance of 1, 5 and 30
m respectively. The corresponding values for the autumn sampling were 4780, 6210 and 4260
ind./m2. The differences were not significant and there was by no means a trend of densities
increasing with the distance to the streets. Earthworm tissue concentrations of PAHs were low,
not higher than 0.78 mg/kg. There were no significant correlations, neither between soil and
tissue contents of PAHs nor between these parameters and earthworm density. Earthworm
density was, however, negatively correlated with soil pH. Chemical analyses are still on-going at
present (March 2008).
The study was supported by the Grant Agency of the AS CR, project No. IAA600660608, by the
Czech Ministry of Education, Youth and Sports, Research Plan No. MSM0021622416, and by
the Academy of Sciences of the Czech Republic, Research Plan No. AV0Z60660521.

Categoria do assunto: | --
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (43869-1) - UPE - PL - -- - CD0305 -  -  - DIS