Boreal Subarctic Lake Water Quality, Zooplankton Communities, and Benthic Macroinvertebrate Communities in Areas Impacted by Wildfire

Wildfires are a natural phenomenon in the boreal forest, but recent studies suggest that there will be increases in the frequency and severity of fires in this region over the next century. When wildfires occur in lake catchments, they may affect water quality and invertebrate communities living in associated lakes. Invertebrates, including zooplankton and benthic invertebrates, play important roles in aquatic food webs, acting as conduits of energy from primary producers to larger organisms such as fish and water birds. Therefore, it is important to understand how these groups will respond to changes caused by fires. Unfortunately, few studies have been conducted in the northern boreal forest to examine how wildfires might impact lakes in this region. For my thesis, I collected data on water quality, macrophytes, zooplankton, and benthic invertebrates from 20 lakes in the Sahtú Settlement Area of the Northwest Territories, which has been impacted by recent fires. Nine of these lakes were affected by fires in their catchments 4-5 years prior to data collection, while eleven were not. My results showed that surprisingly few water quality variables were related to burn history, but lake colour and phenols were higher in lakes affected by burns, and pH and dissolved oxygen were lower in those lakes. Remote sensing data suggest that macrophyte biomass could have increased in lakes affected by burns following the 2014 fires, and macrophyte biomass was an important predictor of community composition for both zooplankton and benthic macroinvertebrates. In addition, burn history was an important predictor of zooplankton richness, and benthic macroinvertebrate richness and abundance. However, my analyses also revealed that natural variability in catchment and lake properties was more important for explaining differences in invertebrate communities among lakes than the effects of wildfires. Overall, my results suggest that shifts in the lake water quality and biology are still detectable 4-5 years after burns in their catchments, suggesting that increased frequency and severity of burns in the north could have long-term impacts on boreal lakes

Boreal Subarctic Lake Water Quality, Zooplankton Communities, and Benthic Macroinvertebrate Communities in Areas Impacted by Wildfire

Wildfires are a natural phenomenon in the boreal forest, but recent studies suggest that there will be increases in the frequency and severity of fires in this region over the next century. When wildfires occur in lake catchments, they may affect water quality and invertebrate communities living in associated lakes. Invertebrates, including zooplankton and benthic invertebrates, play important roles in aquatic food webs, acting as conduits of energy from primary producers to larger organisms such as fish and water birds. Therefore, it is important to understand how these groups will respond to changes caused by fires. Unfortunately, few studies have been conducted in the northern boreal forest to examine how wildfires might impact lakes in this region. For my thesis, I collected data on water quality, macrophytes, zooplankton, and benthic invertebrates from 20 lakes in the Sahtú Settlement Area of the Northwest Territories, which has been impacted by recent fires. Nine of these lakes were affected by fires in their catchments 4-5 years prior to data collection, while eleven were not. My results showed that surprisingly few water quality variables were related to burn history, but lake colour and phenols were higher in lakes affected by burns, and pH and dissolved oxygen were lower in those lakes. Remote sensing data suggest that macrophyte biomass could have increased in lakes affected by burns following the 2014 fires, and macrophyte biomass was an important predictor of community composition for both zooplankton and benthic macroinvertebrates. In addition, burn history was an important predictor of zooplankton richness, and benthic macroinvertebrate richness and abundance. However, my analyses also revealed that natural variability in catchment and lake properties was more important for explaining differences in invertebrate communities among lakes than the effects of wildfires. Overall, my results suggest that shifts in the lake water quality and biology are still detectable 4-5 years after burns in their catchments, suggesting that increased frequency and severity of burns in the north could have long-term impacts on boreal lakes

The response of macroinvertebrates to artificially enhanced detritus levels in plantation streams

International audienceThe leaves and wood from vegetation surrounding headwater streams constitute a major food source for aquatic invertebrates, providing they are retained upon the streambed and not transported downstream. This study investigated the response of aquatic invertebrates to artificially increased detritus retention, in an effort to reproduce the naturally occurring build up of dead organic matter associated with streams in old-growth forest. The background detrital standing stock in streams in Kielder Forest (Northumberland, UK) was low, approximately 32 gm-2. Two streams flowing through dense conifer plantation and one in open broadleaved woodland were manipulated by the addition of logs over a 10 m stream reach. After several months, log addition significantly enhanced detrital standing stocks in both conifer and broadleaved streams. Total invertebrate abundance, taxon richness and the numbers of certain numerically dominant families were significantly higher in experimental than reference reaches in both conifer and broadleaved streams. This response was most marked for detritivores, whilst non-detritivore groups often showed no response to the manipulation. Whilst in the short term the responses to enhanced retention may reflect a redistribution of the local fauna, it is argued that over a longer time-scale, a genuine increase in invertebrate density and diversity could occur. Allowing old-growth forest to develop in planted valley bottoms may be a viable management option for conservation. If established alongside streams, it would ensure continuous input of woody material and the fauna may benefit from the resulting increase in detritus retention. Keywords: forestry, detritivores, old-growth conifers, river management, woody debri

Model Data Fusion: developing Bayesian inversion to constrain equilibrium and mode structure

Recently, a new probabilistic "data fusion" framework based on Bayesian principles has been developed on JET and W7-AS. The Bayesian analysis framework folds in uncertainties and inter-dependencies in the diagnostic data and signal forward-models, together with prior knowledge of the state of the plasma, to yield predictions of internal magnetic structure. A feature of the framework, known as MINERVA (J. Svensson, A. Werner, Plasma Physics and Controlled Fusion 50, 085022, 2008), is the inference of magnetic flux surfaces without the use of a force balance model. We discuss results from a new project to develop Bayesian inversion tools that aim to (1) distinguish between competing equilibrium theories, which capture different physics, using the MAST spherical tokamak; and (2) test the predictions of MHD theory, particularly mode structure, using the H-1 Heliac.Comment: submitted to Journal of Plasma Fusion Research 10/11/200

Intensifying agricultural sustainability: an analysis of impacts and drivers in the development of ‘bright spots’

Food security / Farming systems / Sustainable agriculture / Productivity / Investment / Thailand / Palestine / Latin America / Africa

Walks4Work: Assessing the role of the natural environment in a workplace physical activity intervention

Objectives The primary aim of this study was to examine the impact of physical activity (PA) in the natural environment (eg, "green exercise") on resting autonomic function in the Walks4Work intervention. A secondary aim was to assess the feasibility of Walks4Work in terms of adherence, change in PA levels, and cardiovascular health parameters. Methods In an 8-week randomized control trial, 94 office workers in an international company were allocated to one of three groups: control, nature (NW), or built (BW) lunchtime walking route. Both walking groups were required to undertake two lunchtime walks each week. The NW route centered around trees, maintained grass, and public footpaths. In contrast, the BW consisted of pavement routes through housing estates and industrial areas. Data were collected at baseline and following the intervention. To investigate the impact of the intervention, mixed-design analysis of variance (ANOVA) were performed. Results A total of 73 participants completed the intervention (drop-out rate of 22%). No difference was observed in resting autonomic function between the groups. Self-reported mental health improved for the NW group only. PA levels increased at the intervention mid-point for all groups combined but adherence to the intervention was low with rates of 42% and 43% within the BW and NW groups, respectively. Conclusion Accompanying a guideline of two active lunchtimes per week with low facilitator input appears inadequate for increasing the number of active lunchtimes and modifying cardiovascular health parameters in an office population. However, this population fell within normal ranges for cardiovascular measures and future research should consider investigating at-risk populations, particularly hypertensive individuals

Evidence Reviews on Analysis, Prevalence & Impact of Microplastics in Freshwater and Estuarine Environments Evidence Review 3 What is/are the impact(s) of microplastics on freshwater and estuarine biota?

This Rapid Evidence Assessment used the systematic review procedure to assess the current evidence available on the impact of microplastics on freshwater and estuarine biota. It is important to understand what consequences microplastics may cause in the environment. Furthermore, we need to understand which types of microplastics cause impacts and at what concentrations. A review was conducted of the primary literature, including grey literature, which reported evidence of the impact of microplastics on freshwater and estuarine biota. A particular focus were those publications which reported evidence on the extent to which microplastics influence the behaviour, feeding, growth, reproduction and survival of freshwater and estuarine biota, and any thresholds at which impacts occurred. Publications released prior to April 2019 were included in this review. Evidence was acquired according to a predefined set of questions, compiled into a database containing full details of the source and its relevance to the project questions, and the evidence analysed, taking into account reporting biases in the literature, to produce a digestible summary of the evidence base available to answer the main project question and sub-questions, namely, What is/are the impact(s) of microplastics on freshwater and estuarine biota? a) To what extent do microplastics influence the feeding, growth, reproduction and survival of freshwater and estuarine biota? Do we know trigger levels or threshold values for microplastic impacts on biota? b) Are any differences between different taxonomic groups observed? c) Are results from laboratory studies relevant to microplastics at environmentally relevant field concentrations? d) Are any adverse impacts attributable to the particles or to adsorbed chemicals/microbes on the particles? e) Is there evidence to suggest impacts on populations of aquatic organisms

Pengaruh Madu Terhadap Kualitas Spermatozoa Tikus Wistar (Rattus Norvegicus) Yang Diberi Paparan Asap Rokok

: Cigarettes are composed of hazardous chemicals such as nicotine, tar and carbon monoxide (CO) to name a few. In just a single puff of a cigarette, there are 1014 free radical molecules also known as Reactive Oxygen Species (ROS) that can cause sperm damage. Various natural ingredients native to Indonesia were found to contain various antioxidants, one of them is honey. The effects of honey as antioxidant may protect body cells in neutralizing free radicals caused by smoking and reducing the damage to spermatozoa cell that is caused by ROS and thereby avoiding the declining quality of spermatozoa. This study aimed to determine the effect of honey on the quality of spermatozoa of Wistar rats (Rattus norvegicus) that had been exposed to cigarette smoke. Subjects of this study were nine male Wistar rats (Rattus norvegicus) randomly divided into three groups weighing 150-200 g with the age range of 12-14 weeks. Each group of mice was given exposure to the smoke of 2 cigarettes a day in which the treatment group (P1) is also given 0.5 ml of honey per day, and the treatment group (P2) honey 1 ml / day. The results showed that honey treatment can improve concentration, motility, and morphology of spermatozoa Wistar rats (Rattus norvegicus) by exposure to cigarrets smoke. Occurred a significant difference of concentration, motility, and morphology of spermatozoa group given only the exposure to cigarette smoke and the group given exposure to cigarette smoke and honey. This results showed that 1 ml of honey per day could improve the quality of spermatozoa

Burden and resilience in caregivers of patients on maintenance haemodialysis

Background: Chronic renal failure is one among the chronic illness which due to persistence of the disease has various effects on the physiological, psychological and functional ability of the patient and his family. Although haemodialysis has become a highly safe medical procedure that significantly extended life of such patients, it is nevertheless a stressful and lengthy treatment process. The task of personal life care for such patients falls primarily on the family members. The caregiver is expected to aid in patient’s daily life activities resulting in increased physical and emotional burden. With the considerable level of burden involved the concept of resilience thus become crucial as they could function as protective factors. The current study aims to assess the level of caregiver burden and resilience in caregivers of haemodialysis patients.Methods: A cross sectional observational study was done in 120 caregivers of patients diagnosed as having ESRD on maintenance hemodialysis. Zarit Burden Interview was used for assessing caregiver’s burden. Brief Resilience Scale was used to assess caregiver’s resilience.Results: 35.8% of caregivers had severe caregiver burden while looking after dialysis patients while 45% of caregivers had moderate burden. Caregivers showed low resilience about 72.5% which displays poor problem solving and emotion-focused coping strategies.Conclusions: The study shows that more than 80% of caregivers suffered from moderate to severe burden and poor resilience among them would be a contributing factor. The study also shows that female caregivers were most affected. The burden was significantly higher in caregivers as the years spent on caregiving increased and more hours spent per day looking after the patients. Health-care providers need to address these concerns based on both patient- and caregiver-focused approaches, rather than only patient focused

Cytotoxicity of Alpinia Galanga Rhizome Crude Extract on NIH-3T3 Cells

BACKGROUND: Alpinia galanga (A. galanga) was reported as a potential medicinal source due to its wide effect. A. galanga rhizome crude extract (ARCE) was reported to have high cytotoxic effect in cancer cells, but low in normal cells. However half maximal inhibitory concentration (IC50) of ARCE is not clearly known yet. Hence, current study was conducted to investigate the IC50 of ARCE in normal standard fibroblast cell line, NIH-3T3 cells.METHODS: Rhizomes of A. galanga were collected, peeled, dried, milled and weighed. Extraction was performed using maceration method, then filtered and evaporated. ARCE with various concentrations were applied in NIH-3T3 cells for 24 or 48 hours. Cells were documented and counted with 3-(4,5-dimethylthiazol-2-yl)-2,5-Diphenyltetrazolium bromide (MTT) assay.RESULTS: Five hundreds grams of simplicia were macerated with ethanol and evaporated, 1 mg/mL crude extract with total volume of 114 mL was obtained. By addition of ARCE in NIH-3T3 cell culture, number of NIH-3T3 cells were shown less when treated with higher concentration of ARCE. Cell numbers of 0, 3.125, 6.25, 12.5, 25 and 50% ARCE treatment for 24 hours are 11,531, 11,352, 10,920, 10,365, 9,471, 8,360, respectively, meanwhile for 48 hours are 13,219, 12,686, 12,278, 11,390, 10,279, 8,390, respectively.CONCLUSION: IC50 of ARCE in 24 hours treatment was 620.5 mg/mL, while in 48 hours treatment was 666.6 mg/mL. Hence, ARCE is suggested to have low cytotoxic effect in NIH-3T3 cells