Comparison of Microbial Pyrene and Benzo[a]Pyrene Mineralization in Liquid Medium,Soil Slurry,and Soil

The microbial degradation of ¹⁴C-pyrene and ¹⁴C-benzo[a]pyrene by a bacterial mixed culture was studied within a mixture of the PAHs phenanthrene, anthracene, pyrene, fluoranthene, and benzo[a]pyrene as sole carbon source in the different culture systems: (i) liquid medium, (ii) soil slurry (surface and grinding influence), and (iii) soil. The fate of these two labeled compounds was followed in these systems with an emphasis on mineralization to carbon dioxide, extractability, and adsorption to humic materials and formation of unextractable residual. Mineralization showed the most obvious differences: soil slurries achieved the best results both concerning the extent of mineralization and the time required. The highest extent of pyrene mineralization (54% within 21 days) was observed in soil slurries; in liquid media, pyrene mineralization was slower, but reached approximately the same extent (54% in 150 days); in soils, mineralization reached only 36% of added pyrene after 160 days. Benzo[a]pyrene was mineralized in a mixture of PAHs in soil slurries to an extent of 34% within 70 days, whereas mineralization in liquid medium and soil occurred in the range of 5% (70 days). Mineralization of benzo[a]pyrene in sand slurries was lower compared to soil slurries (19% in sand slurries vs. 32% in soil slurries within 50 days).     

BARRIERS TO NATURE CONSERVATION IN GERMANY: A MODEL EXPLAINING OPPOSITION TO PROTECTED AREAS

Germany is particularly plagued in its nature conservation strategies by widespread and persistent opposition to the designation and management of protected areas through local resistance. This opposition is continuing, despite Germany's commitment to international and European mandates to enhance biodiversity within its borders. This paper seeks to explain why this opposition is so coherent and so protracted with reference to research into the attitudes of residents, landowners and managers on both sides of the debate. The research involved the use of grounded theory approaches, sensitive interactive interviewing, and the gradual application of social psychological theories of social identity and reactance. The evidence is strong that there are powerful emotional and cultural drivers that divide nature conservationists and local landusers and residents into two camps, maintained by stereotyping and group bonding. Based on these findings, practical and constructive ways are proposed to reconcile these differing perceptions.     

Strategic Rat Control for Restoring Populations of Native Species in Forest Fragments

Forest fragments have biodiversity value that may be enhanced through management such as control of non‐native predators. However, such efforts may be ineffective, and research is needed to ensure that predator control is done strategically. We used Bayesian hierarchical modeling to estimate fragment‐specific effects of experimental rat control on a native species targeted for recovery in a New Zealand pastoral landscape. The experiment was a modified BACI (before‐after‐control‐impact) design conducted over 6 years in 19 forest fragments with low‐density subpopulations of North Island Robins (Petroica longipes). The aim was to identify individual fragments that not only showed clear benefits of rat control, but also would have a high probability of subpopulation growth even if they were the only fragment managed. We collected data on fecundity, adult and juvenile survival, and juvenile emigration, and modeled the data in an integrated framework to estimate the expected annual growth rate (λ) of each subpopulation with and without rat control. Without emigration, subpopulation growth was estimated as marginal (λ = 0.95–1.05) or negative (λ = 0.74–0.90) without rat control, but it was estimated as positive in all fragments (λ = 1.4–2.1) if rats were controlled. This reflected a 150% average increase in fecundity and 45% average increase in adult female survival. The probability of a juvenile remaining in its natal fragment was 0.37 on average, but varied with fragment connectivity. With juvenile emigration added, 6 fragments were estimated to have a high (>0.8) probability of being self‐sustaining (λ > 1) with rat control. The key factors affecting subpopulation growth rates under rat control were low connectivity and stock fencing because these factors were associated with lower juvenile emigration and higher fecundity, respectively. However, there was also substantial random variation in adult survival among fragments, illustrating the importance of hierarchical modeling for fragmentation studies. Control Estratégico de Ratas para Restaurar Poblaciones de Especies Nativas en Fragmentos de Bosque     

Nutrition, Disease and Death in Times of Famine

In this article we review the relationship between malnutrition and mortality, and the interaction of morbidity, with the aim of clarifying the health risks of malnutrition in situations of famine and food insecurity. Apart from reviewing what is known about this relationship, we highlight areas where further research is needed. Among refugee and famine affected populations living in camps, there appears to be a close association between high rates of malnutrition and excess mortality. Results from communitybased prospective studies of malnutrition and mortality among individuals conclude that as nutritional status declines the risk of death increases, although the discriminating power of different nutritional indices and the strength of the association varies considerably in different locations and at different times. These differences are attributed mainly to the different prevailing patterns of morbidity and growth failure, which are influenced by both environmental and social factors. In situations of famine and population displacement, the deterioration in the health environment increases exposure to infection and is likely to raise the threshold of nutritional status which corresponds to an increased risk of mortality. This has important implications for nutritional assessments and interventions.     

Malnutrition and Poverty in the Early Stages of Famine: North Darfur, 1988–90

In this article we report findings on the relationship between malnutrition and poverty during a period of acute food insecurity in Darfur, Sudan. Children of rich and poor families were equally likely to be malnourished, which is explained in terms of people's responses to the threat of famine. This finding has important implications for targeting interventions in the early stages of famine. Appropriate interventions at the early stages of famine are livelihood and income support to the most vulnerable. The entitlement theory of famine causation assumes that the poor are most vulnerable, and become malnourished and die during famines. In this article we show that this assumption does not hold. Even though poverty is the root cause of malnutrition, it does not follow that anthropometric status can be used to target individual poor families, or even that targeting the poor is appropriate in famine situations.     

Selectivity in Mammalian Extinction Risk and Threat Types: a New Measure of Phylogenetic Signal Strength in Binary Traits

Abstract: The strength of phylogenetic signal in extinction risk can give insight into the mechanisms behind species’ declines. Nevertheless, no existing measure of phylogenetic pattern in a binary trait, such as extinction‐risk status, measures signal strength in a way that can be compared among data sets. We developed a new measure for phylogenetic signal of binary traits, D, which simulations show gives robust results with data sets of more than 50 species, even when the proportion of threatened species is low. We applied D to the red‐list status of British birds and the world's mammals and found that the threat status for both groups exhibited moderately strong phylogenetic clumping. We also tested the hypothesis that the phylogenetic pattern of species threatened by harvesting will be more strongly clumped than for those species threatened by either habitat loss or invasive species because the life‐history traits mediating the effects of harvesting show strong evolutionary pattern. For mammals, our results supported our hypothesis; there was significant but weaker phylogenetic signal in the risk caused by the other two drivers (habitat loss and invasive species). We conclude that D is likely to be a useful measure of the strength of phylogenetic pattern in many binary traits.     

Nutritional Assessments, Food Security and Famine

The widely held view that malnutrition is a late indicator of famine is challenged on the basis of evidence that people often deliberately reduce their food intake as an early response to inadequate food security. This broadens the possible interventions in response to high malnutrition rates to include measures to support livelihoods under threat of collapse. In the late stages of famine, social disruption and distress migration often result in a degraded health environment which may raise the threshold of nutritional status associated with an increased mortality risk. It is important to assess the underlying causes of malnutrition and the associated health risks. At present, the main objective of nutrition surveys is usually to obtain a reliable estimate of the prevalence of malnutrition among children under five years of age, with little analysis of the underlying causes of malnutrition. Experience from the 1984-85 famine in Darfur led to the development of an alternative approach to nutritional assessment which could be applicable elsewhere in Africa. The combination of quantitative and qualitative methods was particularly valuable as a means of gaining a wider and deeper understanding of the nature of the nutritional situation.