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No. de sistema: 000040614

LDR _ _ 00000nab^^22^^^^^za^4500
008 _ _ 110510m20109999ksuqr1p^^^^^^z0^^^z0eng^d
040 _ _ a| ECO
c| ECO
043 _ _ a| e-sp---
044 _ _ a| ksu
245 0 0 a| Effects of seasonal grazing and precipitation regime on the soil macroinvertebrates of a Mediterranean old-field
520 1 _ a| Soil macroinvertebrate communities (SMC) are well known to influence major ecosystem processes, but relatively few investigations have examined the mechanisms and factors involved in SMC regulation. We conducted a factorial experiment with combinations of seasonal grazing by sheep and irrigation (simulating different precipitation regimes) to assess their effects on the SMC of a semiarid Mediterranean old-field. We also analyzed effects on plant species richness, total aboveground biomass, and litter. The data were collected in autumn and spring, the two favorable seasons for SMC and primary production in the region, and season was included as an additional random factor. Main results were: 1) Ungrazed plots accumulated more aboveground plant biomass and litter during spring, providing extra food for soil biota. However, grazing during autumn or spring did not affect SMC characteristics. 2) Reduction of inter-annual precipitation variability in autumn and spring increased the abundance of two decomposer taxa: Oligochaeta and Diplopoda. Additionally, if summer drought was reduced, plant species richness, litter and the abundance of Isopoda were increased. 3) Oligochaeta and Diplopoda increase their abundance in spring, particularly, the most abundant taxon (Oligochaeta). We conclude that inter- and intra-annual variability in precipitation is a key environmental factor for the decomposer soil fauna in Mediterranean ecosystems, modifying the physical characteristics of the soils (humidity, hardness, etc.), as well as affecting the amount or characteristics of plant biomass or litter. The respiration system of the macroinvertebrates (cutaneous, tracheal or branquial) and the capacity to migrate vertically into the soil may determine the decomposers' responses to precipitation.
650 _ 4 a| Macroinvertebrados del suelo
650 _ 4 a| Oligoquetos
650 _ 4 a| Diplopoda
650 _ 4 a| Indicadores ambientales
651 _ 4 a| Finca Experimental El Encín, Alcalá de Henares (Madrid, España)
700 1 _ a| Morón Ríos, Alejandro
d| 1960-
n| 6602956458
700 1 _ a| Rodríguez, Miguel Ángel
e| coaut.
700 1 _ a| Pérez Camacho, Lorenzo
e| coaut.
700 1 _ a| Rebollo, Salvador
e| coaut.
773 0 _
t| European Journal of Soil Biology
g| Vol. 46, no. 2 (March-April 2010), p. 91-96
x| 1164-5563
902 _ _ a| GOG/MM
904 _ _ a| Mayo 2011
905 _ _ a| Biblioelectrónica
905 _ _ a| Artecosur
LNG eng
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Effects of seasonal grazing and precipitation regime on the soil macroinvertebrates of a Mediterranean old-field
Morón Ríos, Alejandro, 1960- (autor)
Rodríguez, Miguel Ángel (autor)
Pérez Camacho, Lorenzo (autor)
Rebollo, Salvador (autor)
Contenido en: European Journal of Soil Biology. Vol. 46, no. 2 (March-April 2010), p. 91-96. ISSN: 1164-5563
No. de sistema: 40614
Tipo: Artículo


Inglés

"Soil macroinvertebrate communities (SMC) are well known to influence major ecosystem processes, but relatively few investigations have examined the mechanisms and factors involved in SMC regulation. We conducted a factorial experiment with combinations of seasonal grazing by sheep and irrigation (simulating different precipitation regimes) to assess their effects on the SMC of a semiarid Mediterranean old-field. We also analyzed effects on plant species richness, total aboveground biomass, and litter. The data were collected in autumn and spring, the two favorable seasons for SMC and primary production in the region, and season was included as an additional random factor. Main results were: 1) Ungrazed plots accumulated more aboveground plant biomass and litter during spring, providing extra food for soil biota. However, grazing during autumn or spring did not affect SMC characteristics. 2) Reduction of inter-annual precipitation variability in autumn and spring increased the abundance of two decomposer taxa: Oligochaeta and Diplopoda. Additionally, if summer drought was reduced, plant species richness, litter and the abundance of Isopoda were increased. 3) Oligochaeta and Diplopoda increase their abundance in spring, particularly, the most abundant taxon (Oligochaeta). We conclude that inter- and intra-annual variability in precipitation is a key environmental factor for the decomposer soil fauna in Mediterranean ecosystems, modifying the physical characteristics of the soils (humidity, hardness, etc.), as well as affecting the amount or characteristics of plant biomass or litter. The respiration system of the macroinvertebrates (cutaneous, tracheal or branquial) and the capacity to migrate vertically into the soil may determine the decomposers' responses to precipitation."