Optimisation of traffic accident statistics

The OPTIMA project or the “Optimisation of traffic accident statistics”, initiated by the DWTC1, is part of a strategy to obtain the necessary means to establish a traffic safety policy. A policy on traffic safety should be a reliable and representative reflection of safety issues. This makes traffic accident data an essential element in making policy decisions on traffic safety. In this sense, the availability of reliable and representative statistical material is the basis upon which traffic safety policy must be founded. The project objective is to obtain more complete and more representative traffic accident statistics by linking hospital records with existing police records and comparing the hospital data with available police information. Part 1 of the project, the description of the existing situation, goes through a series of steps. The introductory text explores the problem of the current incom-pleteness of recorded data in Belgium. This is followed by an international investigation of recording methods in the Nether-lands, Sweden, Great Britain and the USA. This section provides a more detailed description of hospital records and the concurrence between hospital and police records. In the following report the current Belgian process for hospital records, as well as the pro-cedure through which the hospital notifies the police will be set out. This part will end with a series of policy suggestions, based on the description of the weaknesses of the existing formalities for records. Part 2 of the project outlines a demonstration record system for traffic casualties in hospitals. The aim is to introduce this demo into an emergency admission service and to extend it to a day clinic at a later stage. At the same time, the possibility of coupling hospital data with police data will be explored. Foreign experience with traffic casualty records will be put to use in this experiment. Alongside the de-monstration, the possibility of recording traffic casualties through primary care services will also be examined. Part 3 features policy proposals and validates the research results. This inception report looks at the state of affairs in part 1 of the research project, and more specifically at the problem of the current under-recording of traffic casualties in Belgium and at recording methods in the Netherlands, Sweden, Great Britain and the USA

Spatio-temporal co-occurrence of alien and native molluscs : a modelling approach using physical-chemical predictors

The invasion of alien species can have serious economic and ecological impacts. Ecologically, invasions often lead to an increased rate of native species replacement and decreased biodiversity. A critical step in the dominance of alien species is their successful co-occurrence with native species. In this study, we assessed the occurrence of alien molluscs and their co-occurrence with native molluscs and identified the determining physical-chemical variables. We expected that a combination of some key variables of water quality could provide suitable conditions promoting alien molluscs to occur and to co-occur with native molluscs. The analyses were based on 20-year data, collected from river systems across Flanders (Belgium). Classification Trees (CTs) were used to perform the analyses and to develop the predictive models. Based on CT models, the co-occurrence of alien and native molluscs could be reliably predicted based on physical-chemical variables. However, there was insufficient data to determine the environmental conditions in which alien taxa dominate. From the past to the present, spatial co-occurrence significantly increased. Sinuosity, ammonium and nitrate concentrations, chemical oxygen demand, pH and conductivity were the key determining variables. Our findings suggest that the co-occurrence of alien and native molluscs mainly occurs in straight rivers with good chemical water quality. These results provide insights into the ecology and behaviour of alien species which could support management practices and priority setting for conservation planning in surface waters of Flanders and Europe

Application of decision trees to analyze the ecological impact of invasive species in Polder lakes in Belgium

Polder lakes in Belgium are stagnant waters that were flooded by the sea in the past. Over the years, the salinity of these systems decreased. Several of these systems are colonized by invasive species (often related to fish stocking). The aim of this study was to analyze the ecological impact of invasive macroinvertebrates on native species and to assess to what extend physical-chemical variables affected the presence of invasive species. For this, decision trees were constructed, relating the abiotic lake characteristics to the presence of macroinvertebrates (both invasive and non-invasive). The major advantages of the use of single-target decision trees are the transparency of the rule sets and the possibility to use relatively small databases, since these specific systems were hardly monitored until present

Medicines and driving: evaluation of training and software support for patient counselling by pharmacists

Background : The consumption of some psychotropic medicines has a negative effect on the fitness to drive. Pharmacists are expected to give useful advice to patients on their participation in traffic. However, almost no information is available on this topic. Objective : To assess the effect of training and implementation of new dispensing guidelines with regard to driving-impairing medicines, in two types of dispensing support tools. User acceptance was measured as well as the effect on pharmacists' attitudes & awareness, self-reported behaviour and knowledge. Setting Pharmacists from East Flanders in Belgium. Methods : Two intervention groups and a control group participated. The intervention groups followed a training and were provided with a dispensing support tool containing information on the effect of medicines on driving ability, which was either stand-alone (USB stick) or integrated into the daily used software (ViaNova). The three groups filled out a questionnaire prior to and after the intervention period. Main outcome measure : Answers to a pre/post-questionnaire on attitudes and awareness, self-reported behaviour, knowledge and user acceptance. Results : Many pharmacists were already strongly interested in the topic at the beginning of the study. Positive changes in attitude, self-reported behaviour and knowledge were measured mostly in the group of pharmacists for which the information was integrated in their daily used software. These pharmacists asked significantly more about the patients' driving experience, informed them more about driving-related risk and gave more detailed information on impairing effects of medicines. The knowledge of the participating pharmacists on the topic 'medicines and driving' remained generally low. The participants acknowledge the importance of being aware of the topic medicines and driving but they report a lack of information or education. They strongly prefer a tool that integrates the information in their daily used software. Conclusion : Dispensing support tools with information on the potential impairing effect of a medicine on the fitness to drive increases awareness, reported risk communication behaviour as well as knowledge of pharmacists on this topic. Computerised dispensing support tools are most effective when the information is integrated into the daily used dispensing software

Impact assessment of alien macroinvertebrates in Flanders (Belgium)

Besides habitat fragmentation, the introduction of invasive species is considered to be one of the greatest threats to global biodiversity. Due to increased global trade, habitat degradation and climate change the number of species introductions has increased spectacularly during the last decades. This has led to changes in structure and functioning of ecosystems worldwide. In this study, the impact and spread of alien macroinvertebrates in surface waters in Flanders was investigated. To this end, a large database consisting of biological and physical-chemical data was used, which was collected by the Flemish Environment Agency and supplemented with own sampling campaigns. An integrated approach was aimed for, where the results from laboratory studies, long-term field data analysis and data-driven modelling were combined in order to gain insight in the ecology of alien macroinvertebrate species and the drivers that cause changes in macroinvertebrate community composition. A detailed study on the distribution of alien macroinvertebrates in Flanders revealed that in total, 65 alien macroinvertebrates are established of which 40 are regularly encountered in fresh and slightly brackish inland waters. Most alien taxa belonged to the crustaceans and molluscs originating from North America and the Ponto-Caspian region. Many alien species were first discovered in the east of Flanders from where they started the colonisation of the central and western parts of Flanders. Changes in the macroinvertebrate composition were discovered during the last two decades as a result of changing environmental conditions and the introduction of alien species. When analysing the factors that favoured the establishment and spread of alien macroinvertebrates it was found that shipping, hydro-morphological and physical-chemical factors were detrimental for the success of alien macroinvertebrates. Canals, harbours and the polder waters were hot spots for alien species introductions. Small streams were less invaded by alien macroinvertebrates probably because of a higher biotic resistance and the lack of proper vectors. Case studies of different aquatic ecosystems helped understanding the different factors contributing to successful invasions. The case study on the harbour of Ghent indicated that previously degraded ecosystems are favourable for the early establishment by alien macroinvertebrates. With improving chemical water quality due to the installation of wastewater treatment plants and a stricter environmental legislation not only indigenous, but also alien macroinvertebrates colonised the harbour of Ghent. In the polder waters the indigenous brackish water species decreased in abundance, whereas the American amphipod Gammarus tiginus quickly took in a dominant position after its establishment. These observed changes are probably caused by a decrease in salinity which coincided with an increase of freshwater asselids and the euryhaline species G. tigrinus. It was not only the introduction of the invasive amphipod, but the combination with changing environmental conditions that caused the changes in macroinvertebrate composition. The case study on the Belgian coastal harbours confirmed earlier findings that brackish waters are characterised by a low natural species diversity and a relatively high number of alien species. The harbour of Zeebrugge, which received most international ships, had the highest diversity of alien macroinvertebrates and was also characterised by a high site specific biocontamination index. The knowledge gathered during the case studies was used when making predictions on the future distribution of alien macrocrustaceans in Flanders. Based on data-driven classification and regressions trees it was found that alien macrocrustaceans prefer large rivers and canals with a good chemical water quality and that with increasing conductivity the abundance and species richness of alien macrocrustaceans increases in the brackish water environment. When incorporating the improvements in water quality, it was found that the number of alien species (alien species diversity) will increase in the future, but that the fraction of alien species (alien species abundance) will remain stable. In the last step, an integrated model coupling a habitat suitability model, a water quality model and a migration model was developed to predict the future distribution of a highly invasive alien amphipod species, Dikerogammarus villosus. It was found that D. villosus will invade more large watercourses in Flanders during the next fifteen years as a result of decreases in COD, nitrogen and phosphorous loads and an increase in oxygen concentration. It was calculated that D. villosus spreads with an average speed of five km per year and that given the relatively small size of Flanders, migration speed will not limit its maximal dispersal. The here developed model could be applied as an efficient tool by decision makers to perform risk analysis for (potential) invasive macroinvertebrate species to determine the future distribution range as this could help to reduce the number of species introductions and the impact they have on ecosystem functioning. Besides performing risk assessment several management measures, such as ballast water control, regulations regarding the trade of aquatic alien species and further insight in invaded ecosystems are necessary to reduce the further spread and minimise the impact of invasive alien species

Assessing the suitable habitat for reintroduction of brown trout (Salmo trutta forma fario) in a lowland river : a modeling approach

Huge efforts have been made during the past decades to improve the water quality and to restore the physical habitat of rivers and streams in western Europe. This has led to an improvement in biological water quality and an increase in fish stocks in many countries. However, several rheophilic fish species such as brown trout are still categorized as vulnerable in lowland streams in Flanders (Belgium). In order to support cost-efficient restoration programs, habitat suitability modeling can be used. In this study, we developed an ensemble of habitat suitability models using metaheuristic algorithms to explore the importance of a large number of environmental variables, including chemical, physical, and hydromorphological characteristics to determine the suitable habitat for reintroduction of brown trout in the Zwalm River basin (Flanders, Belgium), which is included in the Habitats Directive. Mean stream velocity, water temperature, hiding opportunities, and presence of pools or riffles were identified as the most important variables determining the habitat suitability. Brown trout mainly preferred streams with a relatively high mean reach stream velocity (0.2-1m/s), a low water temperature (7-15 degrees C), and the presence of pools. The ensemble of models indicated that most of the tributaries and headwaters were suitable for the species. Synthesis and applications. Our results indicate that this modeling approach can be used to support river management, not only for brown trout but also for other species in similar geographical regions. Specifically for the Zwalm River basin, future restoration of the physical habitat, removal of the remaining migration barriers and the development of suitable spawning grounds could promote the successful restoration of brown trout

Optimalisatie van de verkeersongevallenstatistieken

Het project OPTIMA of “Optimalisatie van de verkeersongevallen-statistieken” waarvan de Federale Programmatorische Overheidsdienst Wetenschapsbeleid opdrachtgever is, past binnen een strategie om het beleid de noodzakelijke middelen aan te reiken om een verkeersveiligheidsbeleid op te bouwen. Een verkeersveiligheidsbeleid vertrekt van een betrouwbare en minstens representatieve weergave van de onveiligheid. De ongevallengegevens zijn daarbij een essentieel element om beleidsbeslissingen ten aanzien van de verkeersveiligheid te sturen. Het beschikken over betrouwbaar en representatief statistisch materiaal is in deze zin de basis waarop elk verkeersveiligheids-beleid moet gestoeld worden. Het doel van het project is het verkrijgen van vollediger en meer representatieve verkeersongevallencijfers door het linken van een ziekenhuisregistratie en de bestaande politieregistratie en door het vergelijken van ziekenhuisgegevens en beschikbare politie-gegevens

First occurrence of the Ponto-Caspian amphipod Echinogammarus trichiatus (Martynov, 1932) (Crustacea: Gammaridae) in Belgium

The Ponto-Caspian amphipod species Echinogammarus trichiatus (Martynov, 1932) was found in Belgium for the first time in June 2009 at two different locations in an artificial lake bordered by two large canals. Adults as well as juveniles were found in small numbers and occurred together with several other Ponto-Caspian species such as Dikerogammarus villosus (Sowinsky, 1894) and Dreissena polymorpha (Pallas, 1771). An identification key to the genus Echinogammarus of inland waters in Western Europe is provided. This first record of yet another new amphipod invader in Belgium demonstrates the continuous introduction of alien species into West European waters

Sympatric Dreissena species in the Meuse River : towards a dominance shift from zebra to quagga mussels

The rapid spread of the quagga mussel, Dreissena rostriformis, in Western Europe is of particular concern since the species is known to have serious ecological and economic impacts, similar to those of the well-established zebra mussel, Dreissena polymorpha. This study aimed (1) to provide an update on the quagga mussel distribution in several Belgian inland waterways, and (2) to check if a shift in dominance between Dreissena species is occurring. Using density measurements and artificial substrate samplers, we compared population dynamics for both species at different time-points based on size-frequency distribution. Our results show that quagga mussels are spreading rapidly throughout Belgium via a number of possible invasion fronts based around large rivers and canals. The quagga mussel became the dominant dreissenid species in both the Meuse River and a number of Belgian canals. In just three years, quagga mussel’s relative abundance increased from 2.9% (±2.9) to 52.6% (±43.1) of the total dreissenid population in the Meuse River. The most rapid increase in abundance has occurred in the Albert Canal, where quagga mussels achieved a mean relative abundance of 80% two years after the first observation. In the Meuse River, the quagga mussel displays a faster growth rate and/or earlier reproduction than the zebra mussel. We discuss different mechanisms that could explain the quagga mussel’s apparent competitive advantage over the zebra mussel