Data/hora: 14/06/2024 14:57:11

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 23/09/2008
Data da última atualização: | 23/09/2008
Autoria: | KUPERMAN, R. G.; CHECKAI, R. T.; SIMINI, M.; PHILLIPS, C. T.; HIGADHI, R. M.; FAN, T. W. -M.; SAPPINGTON, K.
Título: | Selenium effects on survival and reproduction of potworm Enchytraeus crypticus in an aerobic sandy upland soil.
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:

We investigated the toxicity of selenium to potworm Enchytraeus crypticus in an aerobic upland
soil, Sassafras sandy loam [Fine-loamy, siliceous, mesic Typic Hapludult], with soil characteristics
(low clay and organic matter; soil pH adjusted high, pH 7.1) that support relatively high
bioavailability of the anionic Se species typically found in soil. Ecotoxicological testing was
specifically designed to meet the criteria for ecological soil screening level (Eco-SSL) derivations
outlined in the Eco-SSL Guideline (USEPA, 2005). We adapted the standardized toxicity test
ISO/16387:2005 to establish toxicity benchmark data for Se, which was amended into soil as
sodium selenate. Amended soil was subjected to weathering-and-aging by 21 days of alternating
cycles of drying/rehydration to 60-75% of water holding capacity, under ambient greenhouse
conditions. Most of the Se remained in selenate form in the soil, including throughout the bioassay.
Survival and reproduction endpoint data were analyzed using nonlinear regression models to
estimate ecotoxicological benchmarks based on the toxicity of selenium to E. crypticus. The
EC20 and EC50 values determined for production of juveniles were 4.4 and 6.2 mg kg-1,
respectively. This research, along with the Se benchmarks for the earthworm Eisenia fetida and
springtail Folsomia candida, was used by the Eco-SSL National Task Group to develop a
selenium Eco-SSL value of 4.1 mg kg-1 for soil invertebrates.

Categoria do assunto: | --
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (43691-1) - UPE - PL - -- - CD0305 -  -  - DIS