The breeding behaviour and social dynamics of a free-ranging group of hoary foxes Pseudalopex vetulus were studied in the central cerrado (savannah) region of Brazil. The average adult size was 3.42 kg [95% confidence limits (CL): 2.92-3.91 kg]. The breeding pair occupied overlapping home ranges of 420-456 ha, where they reared a single litter of five offspring (M:F: 3:2) in 12 months. There were no additional adult group members and all offspring dispersed when c. 10 months old, at least three of which (both sexes) established a home range adjacent to the natal territory. The proportion of time invested in rearing offspring by the breeding female declined significantly (33-2%) with increasing offspring age (pre-weaning to offspring independence), in contrast to that of the breeding male, which was relatively constant (17-29%); the male acted as a chaperone to foraging offspring, mostly in the absence of the breeding female. Hoary fox diet comprised predominantly of insects, particularly termites and dung beetles, none of which was sufficiently bulky to make carriage to the cubs energetically efficient.

Nest-site choice affects individual fitness and possibly reflects natural selection of the capacity of individuals to select appropriate microhabitat features. From 2003 to 2005, we examined nest-site characteristics and nesting success of Blue-black Grassquits (Volatinia jacarina) in central Brazil. We compared the characteristics of nest sites and nonused sites, as well as the characteristics of successful and unsuccessful nests. Grassquit nest sites were structurally more complex than nonused sites. Shrub height and the interaction between vegetation height and percentage of ground coverage were the most important predictors of nest placement. Grassquits used only four (20%) of the 20 grass species in the study area, with Paspalum pectinatum used less than expected based on availability and Melinis minutiflora more than expected. The only variable that differed between unsuccessful and successful nests was the distance to nearest conspecific nest; the latter were about twice as far from neighboring nests as unsuccessful nests. The evaluation of microhabitat candidate models indicated that the daily survival probability of nests varied chiefly as a function of the interaction between their external height and inner depth. Greater survival occurred when the external height was minimized in combination with augmentation of internal depth of the nest cup. The link between nest success and the inverse association of external height and internal depth suggests that minimizing the visual cues of nest presence while maintaining a viable incubation chamber can positively affect nest success. Thus, we suggest that nest concealment is the most critical attribute associated with nest site choice for Blue-black Grassquits in the study area. Vegetation cover above the nest seems to be particularly important, perhaps as a strategy to deter visually oriented aerial predators.

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Caves are important bat roosts worldwide that are used as shelters, maternity roosts, and to help in thermoregulation. Bat abundances, species richness, and association patterns inside caves can be affected by large-scale environmental variation. However, few studies have analyzed the effect of latitudinal and altitudinal variations on these patterns. Here, we conducted a large literature review about cave occupation by bats in Brazil. We investigated the effects of elevation and latitude on bat richness and abundance, the effect of Brazilian biomes on bats' abundance and richness, the dependence between feeding guilds and biomes, and the effects of the number of studies conducted and the number of caves per region on bat species richness. A total of 72 studies with 9666 bats from 72 species were registered in 247 caves. We found that species richness increases toward the equator and reaches its limit at low and intermediate altitudes. Reported richness was influenced by the number of studies conducted in each region. Both latitude and elevation explained the variation in abundance and were significantly affected by biome type. The latitudinal and elevational gradient for species' richness and abundance may be explained by the creation of stable thermal conditions in roosts at high elevations and low latitudes.

Fonte de financiamento: nenhuma. Conflito de interesses: nada a declarar ResumoUm importante desafio para os sistemas de saúde é promover o uso sistemático do conhecimento em políticas públicas que busquem, ao mesmo tempo, melhorar a eficiência e as condições de saúde da população. O objetivo deste artigo foi identificar e discutir estratégias para estimular o uso de evidências científicas no processo de tomada de decisão em políticas de saúde. A busca de evidências científicas foi realizada nos repositórios da Biblioteca Virtual em Saúde, Health Systems Evidence e PubMed. A ferramenta SUPPORT (Supporting Policy Relevant Reviews and Trials) foi usada na construção desse panorama. Sete revisões sistemáticas apontaram quatro principais estratégias para estimular o uso de evidências na tomada de decisão: 1) produzir e disseminar sínteses de evidência com linguagem adaptada a diferentes públicos; 2) estimular o uso do jornalismo e de outras formas de comunicação para ampliar a disseminação do conhecimento científico; 3) utilizar plataforma virtual on-line para disseminação do conhecimento científico; 4) promover a interação entre pesquisadores e tomadores de decisão. Estratégias para estimular o uso de evidências científicas na tomada de decisão em saúde podem ser desenvolvidas de maneira sinérgica, mas é necessário considerar o contexto local e as implicações das estratégias para o sistema de saúde como um todo. Palavras-chave: saúde pública; política de saúde; gestão da saúde; tomada de decisão; tradução do conhecimento; políticas informadas por evidências; disseminação de informação; comunicação e divulgação científica. AbstractA major challenge for health systems is to promote the use of scientific evidence supporting public policies that seek to improve efficiency and the health of the population. The objective of this study was to identify and discuss strategies to encourage the use of scientific evidence in the process of health decision making. The search was performed in the repositories of the Virtual Health Library, Health Systems Evidence and PubMed. SUPPORT (Supporting Policy Relevant Reviews and Trials) Tools were used for the preparation of this overview. Seven systematic reviews were used to identify options to stimulate the use of evidence for decision making: 1) Produce policy briefings with adapted language for different audiences; 2) Stimulate the use of journalism and other forms of mass communication for dissemination of scientific knowledge; 3) Implement online platforms for dissemination of scientific knowledge, and; 4) Promote the dialogue between researchers and policy makers. Strategies to encourage the use of scientific evidence in health decision making can be implemented in a synergistic way; however, it is important to assess the local context and the implications of each strategy for the health system as a whole.

Nest predation is one of the most significant limitations for successful breeding of tropical passerines. Thus, parental strategies may include choosing appropriate nest sites and behaving in ways that minimize predation. Habitat characteristics that may influence nest success include degree of nest concealment, proximity to habitat edge, plant architecture as well as several others cited in the literature. However, few studies have examined display behavior as a factor that could also influence nest survival. We experimentally tested whether sexual motor displays served as a cue for visually oriented predators to locate artificial nests in a population of blue‐black grassquits Volatinia jacarina, a Neotropical passerine that exhibits a complex sexual display and is subjected to elevated rates of nest predation. We also evaluated the effect of nest substrate on survival. Predation rate was higher for nests within territories of displaying males relative to areas without displaying males and for nests placed in shrubs relative to grasses. Predation increased sharply in the third experimental replicate, at the end of the breeding season, which suggests that predators may develop a search image for nests or may become more abundant during specific periods of the season. Avian predators appear to be the most important nest predators. Results suggest that there may be a trade‐off between the increase in fitness derived from sexual displays of males to attract potential mates and the decrease owing to predation of active nests within their territories.

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