The ‘green’ and ‘self’ in green self-governance – a study of 264 green space initiatives by citizens

Scholars observe an increased involvement of citizens in green space governance. This paper focuses on green self-governance, in which citizens play a major role in realizing, protecting and/or managing green space. While existing research on green self-governance focuses mostly on specific cases, we aim to contribute towards a large overview via an inventory of 264 green self-governance practices across The Netherlands. With this, we discuss the relevance of green self-governance for nature conservation and its relationship with authorities. In our analysis, we show that green self-governance practices are very diverse: they pursue a wide variety of physical and social objectives; employ a multitude of physical and political activities; involve different actors besides citizens; mobilize different internal and external funding sources; and are active within and outside of protected areas. While green self-governance can contribute towards protection and management of green space and towards social values, we highlight that this contribution is mostly of a local relevance. Most practices are small scale and objectives do not always match those of authorities. Although we speak of self-governance, authorities play an important role in many practices, for example, as financial donor, landowner or regulatory authority. In this, self-governance is often not completely ‘self’.

Abbreviations: PAA: Policy Arrangement Approach; NNN: National Nature Network; N2000: Natura 2000; NCOs: Nature Conservation Organizations; NGOs: Non-governmental organizations     

Repeated training does not improve the path integrator in desert ants

Desert ants, Cataglyphis fortis, return to their nest by means of path integration vectors. By using the reversal of these vectors, they approach previously visited feeding sites again. They adjust these vectors whenever outbound and inbound vector are set into conflict or when they make use of external cues. Here, we examine the influence of repeated training on the accuracy, precision, and straightness of outbound and inbound vectors. We trained desert ants to forage to and fro between their nest and a feeder and made sure that they relied exclusively on their path integrator. Neither the ants’ outbound nor their inbound runs, which, in general, are straighter than the outbound runs, become more accurate, precise, or straighter during repeated training. Hence, repeated training does not improve the path integrator in desert ants.     

(S)-2-Methyl-1-hexanol,characteristic mandibular gland substance of ants of theCataglyphis bicolor group

Summary In all the species of theCataglyphis bicolor group examined yet, i.e.C. bicolor, C. diehli, C. isis, C. nodus, andC. viaticus, 2-methyl-1-hexanol is the characteristic substance and almost the only substance found in the mandibular glands. Its chirality has been determined inC. bicolor and shown to be exclusively (S)-2-methyl-1-hexanol.     

Social Acceptance of Dairy Farming: The Ambivalence Between the Two Faces of Modernity

Society’s relationship with modern animal farming is an ambivalent one: on the one hand there is rising criticism about modern animal farming; on the other hand people appreciate certain aspects of it, such as increased food safety and low food prices. This ambivalence reflects the two faces of modernity: the negative (exploitation of nature and loss of traditions) and the positive (progress, convenience, and efficiency). This article draws on a national survey carried out in the Netherlands that aimed at gaining a deeper understanding about the acceptance of modern dairy farming in Dutch society. People take two dimensions into account when evaluating different aspects of modern dairy farming: (1) the way living beings are used for production and (2) the way a dairy farm functions as a business. In both these dimensions people appeared to adopt cautious opinions: most people preferred relatively traditional and natural farms and were concerned about the use of nature and treatment of animals in modern production—although this did not imply an outright rejection of modern animal farming. The study also looked for (and sought to explain) differences of opinion between social groups. Besides socio-demographic factors such as age and gender, farming experience and value-orientation (such as socially minded and professional) appeared to be important variables. The values and convictions within modern society can help to explain why some people are greatly concerned about animal welfare while some show less concern. This diversity also helps to explain why general information campaigns are quite ineffective in allaying concerns about modern animal farming.     

Effects of silver and cerium dioxide micro- and nano-sized particles on Daphnia magna

Acute (96 h) and chronic (21 d) exposures of Daphnia magna neonates were carried out with nano- and micro-sized Ag and CeO(2) particles to assess the influence of both material and size of particles on mortality and moulting. Mortality rates for silver in the acute exposures were: AgNP, 56.7 ± 23.3% at 0.1 mg L(-1) and 100 ± 20% at 1 mg L(-1), and micro-Ag, 13.3 ± 6.7% at 0.1 mg L(-1) and 80 ± 20% at 1 mg L(-1). CeO(2) was not acutely toxic at concentrations up to 10 mg L(-1). Mortality for Ag over 21d at concentrations of up to 0.05 mg L(-1) was low, while mortality of 30% was observed for 0.001 mg L(-1) of nano-Ag. CeO(2), with the exception of the 10 mg L(-1) of nano-CeO(2) (100% mortality by day 7), was non-toxic. Inhibition of moulting and growth in the acute study occurred at toxic concentrations (Ag particles), and at 10 mg L(-1) of nano-CeO(2). The chronic study revealed reduced moulting at 0.001 mg L(-1) of nano-Ag and 0.01 and 0.05 mg L(-1) of both sizes of Ag, but there was no impact on D. magna size, and no effects of CeO(2). The toxicity of nano-CeO(2) may be attributed to reduced feeding and physical interference with the daphnids' carapace, resulting in reduced swimming ability. Our results suggest that Ag NPs in particular have the potential to be harmful to aquatic invertebrates after release into the environment, whereas CeO(2) particles appear to cause little adverse effects, and only at environmentally irrelevant concentrations.     

Bestimmung von Mineralölkohlenwasserstoffen in Bodenproben mit Hilfe der Dünnschichtchromatographie

A thin-layer chromatographic method for the determination of mineral oil hydrocarbons (aliphatic compounds and naphtenes) of medium and low volatility in soil samples is presented which is based on their separation and quantitative determination. The extraction of the soil samples is effected by means of an n-hexane-acetone mixture (10∶1) supported by ultrasonics. The evaluation can be made visually or densitometrically by means of a thin-layer scanner. The applicability and restrictions of the method are shown. The advantage of the method lies in its low requirements pertaining to apparatus and chemicals, as well as in its rapidness which makes it suitable for quick in-situ analyses as, for example, for the assessment of the mineral oil content of a contaminated site.     

How does climate change adaptation affect public budgets? Development of an assessment framework and a demonstration for Austria

Mitigation and Adaptation Strategies for Global Change - Public adaptation to climate change affects government budgets directly on the expenditure side, but also indirectly via changes in the tax...     

Shifting maize cultivation and secondary vegetation in the Southern Yucatán: successional forest impacts of temporal intensification

Shifting cultivation around the Calakmul Biosphere Reserve of Mexico, part of the Mesoamerican Biological Corridor, appears to be intensifying temporally through reductions in crop–fallow cycles, with potential impacts on species diversity in the regenerating forest patches surrounding the reserve. This paper documents the temporal intensity of shifting maize cultivation in the region and links it to the species diversity found in secondary vegetation of different ages following different crop–fallow cycles. It finds that younger secondary growth, which is increasing under intensification, has less diversity in species composition. Simultaneously, the concentration of cultivation practices appears to foster more patches in older and more species-diverse vegetation. The implications for the preservation of the region’s forest remain uncertain, however, given the spatial concentration of open lands along two key axes, one which dissects the reserve.     

Concentrations and speciation of arsenic in groundwater polluted by warfare agents

Groundwater polluted with phenylarsenicals from former warfare agent deposits and their metabolites was investigated with respect to the behavior of relevant arsenic species. Depth profiles at the estimated source and at about 1 km downgradient from the source zone were sampled. The source zone is characterized by high total arsenic concentrations up to 16 mg L⁻¹ and is dominated by organic arsenic compounds. The concentrations in the downgradient region are much lower (up to 400 μg L⁻¹) and show a high proportion of inorganic arsenic species. Iron precipitation seems to be an effective mechanism to prevent dispersion of inorganic arsenic as well as phenylarsonic acid. Reductive conditions were observed in the deeper zone with predominant occurrence of trivalent arsenic species. The inorganic species are in redox equilibrium, whereas the phenylarsenic compounds have variable proportions. Methylphenylarsinic acid was identified in groundwater in traces which indicates microbial degradation activity.     

Insect biodiversity: underutilized bioresource for sustainable applications in life sciences

Regional Environmental Change - Due to the growing world population and changing eating habits, there is an increasing demand in sustainable alternative protein sources, whereas the available land...