Role of functionally dominant species in varying environmental regimes: evidence for the performance-enhancing effect of biodiversity

Background Theory suggests that biodiversity can act as a buffer against disturbances and environmental variability via two major mechanisms: Firstly, a stabilising effect by decreasing the temporal variance in ecosystem functioning due to compensatory processes; and secondly, a performance enhancing effect by raising the level of community response through the selection of better performing species. Empirical evidence for the stabilizing effect of biodiversity is readily available, whereas experimental confirmation of the performance-enhancing effect of biodiversity is sparse. Results Here, we test the effect of different environmental regimes (constant versus fluctuating temperature) on bacterial biodiversity-ecosystem functioning relations. We show that positive effects of species richness on ecosystem functioning are enhanced by stronger temperature fluctuations due to the increased performance of individual species. Conclusions Our results provide evidence for the performance enhancing effect and suggest that selection towards functionally dominant species is likely to benefit the maintenance of ecosystem functioning under more variable conditions

Designer reefs and coral probiotics: great concepts but are they good practice?

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Effects of environmental temperature on oviposition behavior in three blow fly species of forensic importance

A number of factors are known to affect blow fly behavior with respect to oviposition. Current research indicates that temperature is the most significant factor. However temperature thresholds for oviposition in forensically important blow flies have not been well studied. Here, the oviposition behavior of three species of forensically important blow fly species (Calliphora vicina, Calliphora vomitoria and Lucilia sericata,) was studied under controlled laboratory conditions over a range of temperatures (10 to 40°C). Lower temperature thresholds for oviposition of 16°C and 17.5°C were established for C. vomitoria and L. sericata respectively, whilst C. vicina continued to lay eggs at 10°C. C. vomitoria and L. sericata both continued to lay eggs at 40°C, whilst the highest temperature at which oviposition occurred in C. vicina was 35°C. Within these thresholds there was considerable variation in the number of surviving pupae, with a general pattern of a single peak within the range of temperatures at which eggs were laid, but with the pattern being much less distinct for L. sericataN/

Impact of external sources of infection on the dynamics of bovine tuberculosis in modelled badger populations

Background The persistence of bovine TB (bTB) in various countries throughout the world is enhanced by the existence of wildlife hosts for the infection. In Britain and Ireland, the principal wildlife host for bTB is the badger (Meles meles). The objective of our study was to examine the dynamics of bTB in badgers in relation to both badger-derived infection from within the population and externally-derived, trickle-type, infection, such as could occur from other species or environmental sources, using a spatial stochastic simulation model. Results The presence of external sources of infection can increase mean prevalence and reduce the threshold group size for disease persistence. Above the threshold equilibrium group size of 6–8 individuals predicted by the model for bTB persistence in badgers based on internal infection alone, external sources of infection have relatively little impact on the persistence or level of disease. However, within a critical range of group sizes just below this threshold level, external infection becomes much more important in determining disease dynamics. Within this critical range, external infection increases the ratio of intra- to inter-group infections due to the greater probability of external infections entering fully-susceptible groups. The effect is to enable bTB persistence and increase bTB prevalence in badger populations which would not be able to maintain bTB based on internal infection alone. Conclusions External sources of bTB infection can contribute to the persistence of bTB in badger populations. In high-density badger populations, internal badger-derived infections occur at a sufficient rate that the additional effect of external sources in exacerbating disease is minimal. However, in lower-density populations, external sources of infection are much more important in enhancing bTB prevalence and persistence. In such circumstances, it is particularly important that control strategies to reduce bTB in badgers include efforts to minimise such external sources of infection

Privileged Communications of Military Chaplains and Mental Health Professionals: Case Law of Military Rules of Evidence 503 and 513

Alarmingly high rates of post-traumatic stress disorder (PTSD) and suicide among Service members returning from military action1 has increased focus within the United States military about effectively providing mental health services.2 Concerns include problems related to an insufficient mental health workforce, military culture, and delivery of services.3 Within this context, how sensitive personal information is handled while seeking mental healthcare is a major concern for service members. The Department of Defense (DoD) and the U.S. Department of Veterans Affairs (DVA) recently partnered to examine opportunities for chaplains to have a role in improving mental health efforts, largely because of their well-respected place within military culture, and the absolute confidentiality they enjoy with communications.4 This initiative—the Integrated Mental Health Strategy—recognizes the important potential chaplains have to promote mental healthcare.5 However, it generates a need to address important practical concerns. A primary issue is how chaplains and mental health providers can work—separately or together—to handle sensitive mental health information of servicemembers.6 This is a major concern because many servicemembers fear that disclosure of mental health issues can jeopardize their military careers if they are perceived as being unfit.7 At the same time, the appropriate handling of such information can be instrumental in helping servicemembers obtain assistance if needed. This raises the question of what the current legal landscape is for the treatment of confidential information by either chaplains or mental health providers within military courts. Military rules regarding privileged communications are currently the primary sources of guidance on these issues. This article provides an overview of applicable military case law on the treatment of privileged communications for both chaplains and mental health professionals. After the introduction in Part I, Part II provides an overview of military chaplaincy, their potential role in addressing mental health needs among servicemembers, and a summary of the mental health landscape. Part III focuses on a review of military cases concerning Military Rule of Evidence 503: Communications to clergy. It identifies the policy rationale behind the clergy privilege, and outlines major military appellate cases which have examined privileged communications under this rule for chaplains, many of which are relevant to situations involving instances of self-harm or harm to others. Part IV outlines case law concerning Military Rule of Evidence 513: Privileged Communications and Psychotherapists. This section identifies the policy rationale of the psychotherapist privilege, and discusses major military appellate cases which have arisen since the privilege was created by presidential order in 1999. Finally, part V discusses the implications of this case law within the framework of the wider policy goals of each rule of evidence, and offers suggested guidance for those working in this area

New disease outbreak affects two dominant sea urchin species associated with Australian temperate reefs

Diseases of sea urchins have been implicated in dramatic transitions of marine ecosystems. Although no definitive causal agent has been found for many of these outbreaks, mostare hypothesised to be waterborne and bacterial. Here we show the first report of a novel diseaseaffecting at least 2 species of urchins off the south-eastern coast of Australia. The aetiologicalagent, identified via a range of molecular techniques, immuno-histology and inoculation experi-ments, was found to be the opportunistic pathogen Vibrio anguillarum . The disease appears to betemperature-dependent, with a faster transmission rate and increase in prevalence during ex -perimental trials conducted at higher temperatures. Furthermore, analysis of long-term field datasuggests that it may have already reached epidemic proportions. With the increases in ocean temperatures brought about by climate change, this novel urchin disease may pose a severe problem for the organisms associated with the temperate reefs off Australia and/or the ecosystemas a whole

Early Warning Signs of Suicide in Service Members Who Engage in Unauthorized Acts of Violence

Despite the importance of both suicide and violence prevention in the military, little is known about how these behaviors relate to one another. The current research sought to elucidate the relationship between early warning signs for suicide and violence in a military population. This study included a review of 200 military law enforcement records maintained by the Naval Criminal Investigative Service (NCIS) and identification of early warning signs that may be observable to military law enforcement personnel. Statistical analyses tested for differences in warning signs between cases of suicide, violence, or both suicide and violence. The suicide-only and suicide/violence groups were more likely than the violence-only group to show early warning signs for: (1) psychological issues of depression, anxiety, hopelessness, a mental health diagnosis, and participation in treatment, (2) physical changes and impulsive behaviors, particularly substance abuse, (3) social warning signs, specifically social withdrawal, and (4) occupational issues, including diminished performance and interest at work. By contrast, the suicide/violence group was more likely than the other groups to show early warning signs of anger and aggression. Our findings suggest that Service members at risk for both suicide and violence are similar to those exclusively at risk for suicide, and they each differ from those solely at risk for violence. Our findings also suggest that the emotional trajectory that those who are both suicidal and violent follow is more aggressive, hostile, and angry than those who are either strictly suicidal or violent. The findings from this effort may enhance the ability of law enforcement and command personnel to prevent further acts of suicide and violence among military personnel. Recommendations for policy and future research are discussed

Early Warning Signs of Suicide in Service Members Who Engage in Unauthorized Acts of Violence

Despite the importance of both suicide and violence prevention in the military, little is known about how these behaviors relate to one another. The current research sought to elucidate the relationship between early warning signs for suicide and violence in a military population. This study included a review of 200 military law enforcement records maintained by the Naval Criminal Investigative Service (NCIS) and identification of early warning signs that may be observable to military law enforcement personnel. Statistical analyses tested for differences in warning signs between cases of suicide, violence, or both suicide and violence. The suicide-only and suicide/violence groups were more likely than the violence-only group to show early warning signs for: (1) psychological issues of depression, anxiety, hopelessness, a mental health diagnosis, and participation in treatment, (2) physical changes and impulsive behaviors, particularly substance abuse, (3) social warning signs, specifically social withdrawal, and (4) occupational issues, including diminished performance and interest at work. By contrast, the suicide/violence group was more likely than the other groups to show early warning signs of anger and aggression. Our findings suggest that Service members at risk for both suicide and violence are similar to those exclusively at risk for suicide, and they each differ from those solely at risk for violence. Our findings also suggest that the emotional trajectory that those who are both suicidal and violent follow is more aggressive, hostile, and angry than those who are either strictly suicidal or violent. The findings from this effort may enhance the ability of law enforcement and command personnel to prevent further acts of suicide and violence among military personnel. Recommendations for policy and future research are discussed

Impact of biodiversity-climate futures on primary production and metabolism in a model benthic estuarine system

<p>Abstract</p> <p>Background</p> <p>Understanding the effects of anthropogenically-driven changes in global temperature, atmospheric carbon dioxide and biodiversity on the functionality of marine ecosystems is crucial for predicting and managing the associated impacts. Coastal ecosystems are important sources of carbon (primary production) to shelf waters and play a vital role in global nutrient cycling. These systems are especially vulnerable to the effects of human activities and will be the first areas impacted by rising sea levels. Within these coastal ecosystems, microalgal assemblages (microphytobenthos: MPB) are vital for autochthonous carbon fixation. The level of <it>in situ </it>production by MPB mediates the net carbon cycling of transitional ecosystems between net heterotrophic or autotrophic metabolism. In this study, we examine the interactive effects of elevated atmospheric CO₂concentrations (370, 600, and 1000 ppmv), temperature (6°C, 12°C, and 18°C) and invertebrate biodiversity on MPB biomass in experimental systems. We assembled communities of three common grazing invertebrates (<it>Hydrobia ulvae, Corophium volutator </it>and <it>Hediste diversicolor) </it>in monoculture and in all possible multispecies combinations. This experimental design specifically addresses interactions between the selected climate change variables and any ecological consequences caused by changes in species composition or richness.</p> <p>Results</p> <p>The effects of elevated CO₂concentration, temperature and invertebrate diversity were not additive, rather they interacted to determine MPB biomass, and overall this effect was negative. Diversity effects were underpinned by strong species composition effects, illustrating the importance of individual species identity.</p> <p>Conclusions</p> <p>Overall, our findings suggest that in natural systems, the complex interactions between changing environmental conditions and any associated changes in invertebrate assemblage structure are likely to reduce MPB biomass. Furthermore, these effects would be sufficient to affect the net metabolic balance of the coastal ecosystem, with important implications for system ecology and sustainable exploitation.</p

Microbial effects on the development of forensically important blow fly species

Colonisation times and development rates of specific blow fly species are used to estimate the minimum Post Mortem Interval (mPMI). The presence or absence of bacteria on a corpse can potentially affect the development and survival of blow fly larvae. Therefore an understanding of microbial-insect interactions is important for improving the interpretation of mPMI estimations. In this study, the effect of two bacteria (Escherichia coli and Staphylococcus aureus) on the growth rate and survival of three forensically important blow fly species (Lucilia sericata, Calliphora vicina and Calliphora vomitoria) was investigated. Sterile larvae were raised in a controlled environment (16:8 h day: night light cycle, 23:21 °C day: night temperature cycle and a constant 35% relative humidity) on four artificial diets prepared with 100 μl of 105 CFU bacterial solutions as follows: (1) E. coli, (2) S. aureus, (3) a 50:50 E. coli:S. aureus mix and (4) a sterile bacteria-free control diet. Daily measurements (length, width and weight) were taken from first instar larvae through to the emergence of adult flies. Survival rates were also determined at pupation and adult emergence. Results indicate that bacteria were not essential for the development of any of the blow fly species. However, larval growth rates were affected by bacterial diet, with effects differing between blow fly species. Peak larval weights also varied according to species-diet combination; C. vomitoria had the largest weight on E. coli and mixed diets, C. vicina had the largest weight on S. aureus diets, and treatment had no significant effect on the peak larval weight of L. sericata. These results indicate the potential for the bacteria that larvae are exposed to during development on a corpse to alter both developmental rates and larval weight in some blow fly species.Daphne Jackson Trus