Aperitivo...

Olá,


Vou transcrever algumas passagens do artigo que estou finalizando para vocês terem uma ideia do conteúdo.


"Our main objective was to assess the responses of arthropod communities to three effects commonly linked to forest fragmentation, namely area effect, isolation effect, and forest conversion effect. Taking the expected responses of community diversities to forest fragmentation (Ewers and Didham 2006; Fahrig 2003), we aimed to respond the specific questions: (1) loss of area is accompanied by a loss of species richness and abundance?; (2) increasing isolation of fragments translates in loss of species richness and abundance?; and (3) fragments of forests contain more species richness and abundance than disturbed habitats? Additionally, we aimed to characterize the distribution of forest fragmentation studies on arthropod communities on the World Forest Biomes and Ecoregions."


"That second selection filtered 34 papers used in the present study (...) Each selected paper was classified by taxa studied, biome, ecoregion, forest fragments boundaries, micro-habitat sampled, sampling technique, and type of experiment."


"A total of 34 papers approaching the effects of area, isolation and/or habitat on arthropod communities were selected based on criteria described above. The first published paper on the effects of forest fragmentation on arthropods dates to 1988. In the following decade six papers were published and the majority of fragmentation studies came out during the last decade. From the total only five studies performed field experiments (manipulatives) with some degree of control of the factors linked to fragmentation, commonly the area. All other studies were natural experiments (mensuratives)."


"Six forest biomes were contemplated in our review. The only exception is the tropical and subtropical coniferous forests. However, the ecoregions are poorly represented."


"The most assessed taxon was Insecta among the Hexapoda. Arachnida was assessed seven times (...) By far the most studied taxon was Coleoptera with 20 papers. In spite of this only two beetle families Scarabaeidae and Carabidae comprise the great part of studies."


"Table 3 resumes the responses of the components of diversity of each arthropod taxon to the three main effects of fragmentation in each biome resumed in the present study. The majority of paper assessments were on the effects of forest conversion to other habitats (...) Surprisingly, isolation effects were poorly assessed in forest fragmentation studies – only nine times (...) Area loss effects were assessed 30 times. There were not positive responses of richness to the loss of forested area, but one study with carabid beetles in BF showed a positive effect on abundance, i.e. abundance was negatively related to fragment area."


"Our results show that the arthropod diversity responses to forest fragmentation are still poorly studied worldwide. In spite of the majority of biomes had been contemplated, studies are concentrated in few ecoregions most probably linked to particular research groups."


Paz a todos.