24 research outputs found
Interrompendo rotas, higienizando pessoas: técnicas sanitárias e seres humanos na ação de guardas e visitadoras sanitárias
Negative Impacts of Human Land Use on Dung Beetle Functional Diversity
The loss of biodiversity caused by human activity is assumed to alter ecosystem
functioning. However our understanding of the magnitude of the effect of these
changes on functional diversity and their impact on the dynamics of ecological
processes is still limited. We analyzed the functional diversity of
copro-necrophagous beetles under different conditions of land use in three
Mexican biosphere reserves. In Montes Azules pastures, forest fragments and
continuous rainforest were analyzed, in Los Tuxtlas rainforest fragments of
different sizes were analyzed and in Barranca de Metztitlán two types of
xerophile scrub with different degrees of disturbance from grazing were
analyzed. We assigned dung beetle species to functional groups based on food
relocation, beetle size, daily activity period and food preferences, and as
measures of functional diversity we used estimates based on multivariate
methods. In Montes Azules functional richness was lower in the pastures than in
continuous rainforest and rainforest fragments, but fragments and continuous
forest include functionally redundant species. In small rainforest fragments
(<5 ha) in Los Tuxtlas, dung beetle functional richness was lower than in
large rainforest fragments (>20 ha). Functional evenness and functional
dispersion did not vary among habitat types or fragment size in these reserves.
In contrast, in Metztitlán, functional richness and functional dispersion
were different among the vegetation types, but differences were not related to
the degree of disturbance by grazing. More redundant species were found in
submontane than in crassicaule scrub. For the first time, a decrease in the
functional diversity in communities of copro-necrophagous beetles resulting from
changes in land use is documented, the potential implications for ecosystem
functioning are discussed and a series of variables that could improve the
evaluation of functional diversity for this biological group is proposed
Enfermeiras americanas do Serviço Especial de Saúde Pública e a formação de recursos humanos na Enfermagem Brasileira
Prevalência de relação sexual e fatores associados em adolescentes escolares de Goiânia, Goiás, Brasil
NOTAS SOBRE IRESINE WEBERBAUERI (AMARANTHACEAE), UNA ESPECIE END\uc9MICA DEL VALLE MARA 1 3N EN EL NORTE DEL PER a
Volume: 23Start Page: 135End Page: 14