Data/hora: 25/06/2024 18:57:51

Biblioteca(s): | Embrapa Soja.
Data corrente: | 29/06/2005
Data da última atualização: | 15/02/2024
Autoria: | BROWN, G. G.; BUENO-VILLEGAS, J.; HERNANDEZ-CASTELLANOS, B.; BAROIS, I.
Título: | Soil macroinvertebrate populations and their seasonal dynamics in a native pasture at La Víbora (VER) Mexico.
Ano de publicação: | 2004
Fonte/Imprenta: | In: INTERNATIONAL COLLOQUIUM ON SOIL ZOOLOGY AND ECOLOGY, 14., 2004. Mont Saint Aignan. Abstracts. Mont Saint Aignan: Université de Rouen, 2004. p. 25.
Idioma: | Inglês
Conteúdo: | The soil macroinvertebrate community, comprising all easily visible organisms found in the soil were sampled by handsorting throughout a one-year period in a seasonally dry, native grass pasture located near La Vibora, Mexico. Annual rainfall was 1420 mm, of which 84% concentrated between the months of June to October. Each month 25 samples (25x25 cm, 20 cm depth) were taken and sorted manually in the field. A total of 10 monthly samples were taken between June 1996 and May 1997. Earthworms were collected, weighed wet, preserved in 10% formalin and then separated into species and re-weighed, while the ramaining fauna were collected, preserved in 70% alcohol, separated into taxonomic orders and weighed wet. At each sample date, soil moisture and pasture biomass (green, dry, shoot and root) were also measured. The results show that soil moisture, green shhot biomass and soil fauna biomass (espec. earthworms) followed a similar pattern, with maximum values in the mid-end rainy season and minimum at the end of the dry season. Total fauna biomass ranged from a minimum of 1.3 g m-2 late in the dry season (early June) to a maximum of 49 g m -2 in mid-rainy season (September). Earthworms generally dominated the total biomass, especially in the rainy season (July-November), when they contributed more than 80% of the total. In the dry season, earthworm contribution dropped to less than 30%, when the contribution of beetles (larvae and adults), ants and lepidoptera larvae concomitantly increased, reaching up to 60% (Coleoptera in June). Total abundance ranged from a low mean value of 109 individuals m-2 late in the dry season (May) to a maximum of 452 individuals m-2 late in wet season (October). As with biomass, coleoptera and ants (up to 75% in June) represented the majority of the total density in the drier periods, while earthworms contributed from 28-84% in the wet season, and less than 25% (as low as 3%) in the dry season. Seven earthworm species, six native and one exotic were found. A new species of the Glossoscolecidae family was dominant in numbers and biomass,generally representing >80% of total erathworm abundance and biomass. Total diversity of groups (number of orders) was generally low on each sample date, rarely exceeding 7 orders. Highest total diversity was found in the mid-late dry season. The average number of orders per sample ranged from 2 to 5, being highest at the end of the rainy season (October), and the middle of the dry season (February).
Thesagro: | Animal Invertebrado; Biologia do Solo; Pastagem Nativa.
Categoria do assunto: | --
Registro original: | Embrapa Soja (CNPSO)
Exemplares: | CNPSO - (25235-1) - UPC - RA - -- - 9899 -  - 9899 - DIS