Gut microbiota of migrating wild rabbit fish (Siganus guttatus) larvae have low spatial and temporal variability

We investigated the gut microbiota of rabbit fish larvae at three locations in Vietnam (ThuanAn-northern, QuangNam-intermediate, BinhDinh-southern sampling site) over a three-year period. In the wild, the first food for rabbit fish larvae remains unknown, while the juveniles and adults are herbivores, forming schools near the coasts, lagoons, and river mouths, and feeding mainly on filamentous algae. This is the first study on the gut microbiota of the wild fish larvae and with a large number of individuals analyzed spatially and temporally. The Clostridiales order was the most predominant in the gut, and location-by-location alpha diversity showed significant differences in Chao-1, Hill number 1, and evenness. Analysis of beta diversity indicated that the location, not year, had an effect on the composition of the microbiota. In 2014, the gut microbiota of fish from QuangNam was different from that in BinhDinh; in 2015, the gut microbiota was different for all locations; and, in 2016, the gut microbiota in ThuanAn was different from that in the other locations. There was a time-dependent trend in the north-south axis for the gut microbiota, which is considered to be tentative awaiting larger datasets. We found limited variation in the gut microbiota geographically and in time and strong indications for a core microbiome. Five and fifteen OTUs were found in 100 and 99% of the individuals, respectively. This suggests that at this life stage the gut microbiota is under strong selection due to a combination of fish-microbe and microbe-microbe interactions

Land take and value capture : towards more efficient land use

The paper aims to explore the possibilities to enhance the efficiency of land use, considering the evolution of land take (LT), and proposes the use of public value capture (PVC) instruments in selected differently experienced countries. This answers two fundamental questions. How is the concept of LT positioned in relation to the environmental policy of Europe? Which PVC instruments could stimulate more efficient land use? The aim of this article is to identify which tools can guide the transformations of the urban environment by promoting more efficient land use. These tools have been identified in the mechanisms for capturing value as they can pursue the goal of a more attractive net LT. For these reasons, the article initially analyses the spread of the problem of land consumption, at a European level, showing how this phenomenon is very diversified not only between individual states, but also within each nation. In addition, the knowledge system to define the main initiatives and actions aimed at orienting urban development in the direction of reducing land consumption is highlighted. Subsequently, the theoretical framework concerning the issues relating to the capture of public value in urban planning operations is illustrated. The case studies representing the various European contexts are then introduced, and for each case the dynamics of urban development were analysed. It has been done in relation to the evolution of the regulatory apparatus of territorial governance and its transformations. On the basis of this analysis, indicators have been defined. Their goal is to allow comparing the results that emerged from the case study analysis, which would otherwise have been inconsistent. In this way, it is possible to demonstrate how land use is more efficient in countries where PVC tools are used systemically and how these tools make it easier to guide urban transformations in line with the principles of sustainable development.This article is based upon work from COST Action 17125, supported by COST (European Cooperation in Science and Technology).peer-reviewe

Nieuw stedelijk wonen. Over de verzoenbaarheid van de aspiraties van gezin en overheid

status: publishe

De 25 gewestplannen, een collage van ruimtelijk overaanbod

status: publishe

Vlaanderen en stedelijkheid: een moeilijke verhouding. Case van de afbakening van het grootstedelijk gebied Gent

status: publishe

Tijdloze ruimte. Planning voor onbepaalde duur, of hoe de gewestplannen tot stand kwamen

status: publishe

Belgium

peer reviewe