Search results for "Habit"
showing 10 items of 1816 documents
Trémery, Moselle, ZAC de la Fontaine des Saints, site 19 : rapport de fouille
2013
Le Néolithique ancien est marqué par la présence de fosses allongées. La céramique issue de leur remplissage montre des décors réalisés selon la technique du pointillé-sillonné ainsi que l'utilisation du peigne à deux dents et la forte proportion du motif en chevron simple ou double, permettant d'attribuer l'ensemble du mobilier céramique des fosses à l'horizon IIc du Rubané de la chronologie du Rhin moyen ou de la phase 5 régionale. Si du point de vue de la céramique, les fosses appartiennent au même horizon chronologique, en revanche il n'est pas établi qu'elles aient été associées au même habitat qui n'a d'ailleurs pas été conservé. Au regard du nombre de vestiges, on peut penser que le …
A METHODOLOGY DEVELOPMENT FOR A WEB-BASED SURVEILLANCE SYSTEM OF ADOLESCENT FOOD HABITS AND LIFESTYLES – THE ASSO PROJECT
2012
ASSO Project (Adolescents Surveillance System and Obesity prevention) is a study financed by the Italian Ministry of Health, aimed at developing an innovative web-based system for a standardized collection of data on food consumptions, lifestyles and body size in the adolescents attending high schools. One of the main objectives of the project is to develop user-friendly and cost-effective tools to create a web-based software. A Systematic Literature Review (SLR) on the most valid dietary and physical activity/fitness assessment methods used in the target population has been perfomed. The implementation of the software is being done by using JAVA and the data archive system is based on MySQ…
Long-term recovery of stream habitat structure and benthic invertebrate communities from in-stream restoration
2002
Headwater streams channelized for water transport of timber in Finland are being restored to their pre-channelization state. The primary motivation is the enhancement of sport fisheries, but restoration probably has profound impacts also on other stream organisms. We assessed how such ‘‘single-goal’’ restorations affect benthic macroinvertebrate communities. We revisited the streams sampled by Laasonen et al. [Aquatic Conservation: Marine and Freshwater Ecosystems 8 (1998)] in the early 1990s when the streams had been recently restored. In 1997, the recovery period of these streams ranged from 4 to 8 years. Habitat structure among the stream types represented a distinct recovery gradient, w…
Data from: Inter-annual variation and long-term trends in proportions of resident individuals in partially migratory birds
2016
Partial migration – a part of a population migrates and another part stays resident year-round on the breeding site – is probably the most common type of migration in the animal kingdom, yet it has only lately garnered more attention. Theoretical studies indicate that in partially migratory populations, the proportion of resident individuals (PoR) should increase in high latitudes in response to the warming climate, but empirical evidence exists for few species. We provide the first comprehensive overview of the environmental factors affecting PoR and the long-term trends in PoR by studying 27 common partially migratory bird species in Finland. The annual PoR values were calculated by divid…
Importance of dispersal and thermal environment for mycorrhizal communities: lessons from Yellowstone National Park
2011
International audience; The relative importance of dispersal and niche restrictions remains a controversial topic in community ecology, especially for microorganisms that are often assumed to be ubiquitous. We investigated the impact of these factors for the community assembly of the root-symbiont arbuscular mycorrhizal fungi (AMF) by sampling roots from geothermal and nonthermal grasslands in Yellowstone National Park (YNP), followed by sequencing and RFLP of AMF ribosomal DNA. With the exception of an apparent generalist RFLP type closely related to Glomus intraradices, a distance-based redundancy analysis indicated that the AMF community composition correlated with soil pH or pH-driven c…
Mining extraction in the ocean depths: a baseline to understand and reduce acoustic impact on biodiversity.
2020
[ES] A lo largo de la historia, el hombre ha explotado los recursos minerales de la tierra para su supervivencia y desarrollo tecnológico sin un equilibrio con su regeneración. Dado el crecimiento de la población mundial y la reducción de recursos, el hombre comenzó a buscar nuevos depósitos que se encontraron en la década de 1960 en las profundidades de los océanos. Con estos, la humanidad empezò a pensar en extraer los minerales de estos depósitos y esto llevò al nacimiento de Deep Sea Mining (DSM). Las consecuencias de las actividades mineras en las profundidades del mar no se conocen realmente y los efectos pueden ser diferentes: contaminación acústica, contaminación lumínica, contamina…
Modelling analysis of centroid curves of olfactory habituation in humans
2020
Indexation en cours.; International audience; Previously published experiments established the time-course of olfactory habituation in humans, and extracted 3 centroid curves from clustering analysis that reflected high, middle and low habituation. The aim of the current theoretical study was to further analyse these previous experimental data by developing a mathematical modelling analysis designed for fitting the 3 curves from a general equation. After adjusting equation parameters for each curve, fitting equation outcomes on experimental data yielded high correlation coefficients of 0.9997 – 0.9995 – 0.9962, respectively. A model-based interpretation of olfactory-habituation centroid cur…
Herons of French Polynesia. Threats, status and conservation.
2018
8 pages; International audience; In French Polynesia, only three Ardeidae are present: Cattle Egret (Bubulcus ibis), Tahiti Striated Heron (Butorides striata patruelis) and Eastern Reef-Heron (Egretta sacra), and the last two breed there. The Eastern Reef-Heron is widespread in the Pacific range and its conservation status is least concern. However, the status of the Tahiti Striated Heron is critically endangered on the International Union for the Conservation of Nature Red List. In 2009, only 70 birds were estimated living in Tahiti and thus the entire French Polynesia. Threats are mainly due to the restricted distribution of breeding habitat and habitat destruction. The Tahiti Striated He…
Validation des modèles de connectivité issus de la théorie des graphes en utilisant des données génétiques
2021
National audience; Modéliser la connectivité fonctionnelle des habitats est déterminant pour la conservation de la biodiversité. Les graphes paysagers, en modélisant des taches d’habitat reliées par des chemins de dispersion potentiels, permettent de quantifier la connectivité du paysage. Si cette approche semble prometteuse, sa validité écologique reste à démontrer. Tester sa validité implique de confronter des données de connectivité issues d’un graphe à des données reflétant la dispersion des individus, telles que des données génétiques. Dans cet objectif, nous avons modélisé la connectivité de l’habitat d’une espèce d’oiseau forestière, la Paruline caféiette (Setophaga plumbea), en Guad…
Temporal dynamics of arable weeds communities assembly : interactions between farming practices and ecological processes across crop sequences
2018
Understanding how farming practices affect weed community assembly in arable fields is a core challenge of agro-ecology. Weeds are supposed to share particular ecological characteristics that allow them to colonize arable fields despite environmental constrains exert by farming practices. In addition, interactions between ecological processes operating during a cropping season (eg: abiotic filtering) and at the scale of crop succession (eg: temporal dispersal) are supposed to drive weed community assembly in arable fields. These two hypotheses have been tested in my phD work.First, we compared a pool of weed species to a pool of non-weed herbaceous plants based on several functional traits …