No abstract

-The use of arthropods for monitoring habitat changes has grown widely in the last decades. In Brazil, however, most of the studies in restored areas have involved only vegetation changes. The present study aimed at investigating recolonization patterns of epigeic arthropods in recently restored sites of semideciduous forests in southeastern Brazil. We compared the community structure of adjoining sites 5, 17, 29 and 36 months old with that at a nearby forest remnant (reference site). We also determined the most abundant species and looked for ecological indicator species of each site age. Arthropods were sampled using pitfall traps, and their assemblages were described and compared with multi-and univariate statistical methods. Species abundance and richness equivalent to the reference site were reached at fi ve months after planting, however species composition was very distinctive not only in relation to the reference site, but also among restored sites. Some of the main species found in this restoration stage are common in agroecosystems or cerrado vegetation. Nevertheless, there was a clear trend of arthropod fauna in restored sites moving toward the fauna in the forest remnant over time. Our results also highlighted ants and termites because of their abundance and ants because of their high value as ecological indicators of restoration age.KEY WORDS: Formicidae, seasonal forest, monitoring, ecological indicatorThe landscape of southeastern Brazil has been entirely transformed over time by human activities (Dean 1997). Changes were especially dramatic in the inner lands originally covered by mesophytic seasonal forests (deciduous and semideciduous forests) since their soils are particularly suitable for agriculture (Oliveira-Filho & Ratter 2002). Such forests are now restricted to few small patches in the agricultural-urban matrix. Some attempts of restoration have been made in the last decades, but their effectiveness has not been properly evaluated. Long-term monitoring of sites where attempts have already been performed is necessary for evaluating restoration success and improving restoration protocols. If techniques involve tree planting, special attention should be dispensed to the fi rst years of the restored site, when the greatest habitat changes occur due to the fast growing of pioneer trees.Most of the studies in restored areas are concerned with recovery and development of vegetation, especially tree species (Amador & Viana 2000, Souza & Batista 2004, whereas fauna is usually ignored (but see Majer 1992).Because of the high turnover and growth rates for most species, arthropods serve as probes that quickly respond to environmental changes. Another special attribute lies in their microgeographic distribution, which may refl ect fi nescale heterogeneity in habitats to which most vertebrates are insensitive (Mattoni et al 2000). Arthropods often provide a more sensitive indication than plants of the overall state of the ecosystem in which they occur (Rosenberg et al 1986, Andersen & Sparli...

The recovery of soil ecological processes during the restoration of tropical forests is greatly influenced by arthropods that live in the litter and soil. However, these communities present complex dynamics, and their colonization patterns are not well understood. In this study, we examined the response patterns of litter and soil arthropods to the ecosystem regeneration process by assessing reforestation sites from two regions of São Paulo State, Brazil, and we compared the data obtained from these sites with data from mature forests. We assessed the arthropod communities using similarity indices and high‐level taxa abundance, with the level of forest succession and the locations of the restoration areas as factors. Forest succession correlated with the species composition as communities from the reforestation sites gradually became more similar to communities from the mature forests, while their quantitative patterns were minimally related. Forest maturation positively affected the richness of the litter community and the abundance of some minor groups, such as Protura, Diplura, and Symphyla. The region influenced the species composition but did not influence the manner in which the communities changed during the maturation process. We also found a convergent soil colonization pattern as arthropod communities from different sites became more similar during forest succession. This finding is consistent with both empirical data and theoretical predictions from the specialized literature, although the subject has been poorly explored until now. We conclude that reforestation allows the colonization of soil and litter fauna in a biased manner.

Ursolic acid from Jacaranda decurrens showed toxicity and feeding deterrency towards the greenbug Schizaphis graminum. Biological activity was determined by analyzing ursolic acid effects on the survival, reproductive index, and population growth rate of the greenbug. Survival and reproductive index decreased in direct proportion to ursolic acid content in the diet. The population growth rate decreased markedly when the aphids were fed on barley leaves sprayed with ursolic acid dissolved in DMSO, in comparison to leaves sprayed only with DMSO. The feeding behavior of the greenbug was also affected by ursolic acid. Ingestion time on diet with 0.1 mM was reduced about 30% in relation to the ingestion time on control diet.