Search results for "diversification"

Data from: The joint evolution of the Myxozoa and their alternate hosts: a cnidarian recipe for success and vast biodiversity

2018

The relationships between parasites and their hosts are intimate, dynamic and complex; the evolution of one is inevitably linked to the other. Despite multiple origins of parasitism in the Cnidaria, only parasites belonging to the Myxozoa are characterized by a complex life cycle, alternating between fish and invertebrate hosts, as well as by exceptionally high species diversity. This inspired us to examine the history of reciprocal interactions and adaptive radiations in myxozoans and their hosts by determining the degree of congruence between their phylogenies and by timing the emergence of myxozoan lineages in relation to their hosts. Recent genomic analyses suggested a common origin of …

Data from: Patterns of ecological diversification in thelodonts

2018

Here we explore the spatial, temporal and phylogenetic patterns of ecological diversification for the entire clade of thelodonts, one of the earliest groups of vertebrates and longest lasting of the Palaeozoic agnathans in the fossil record. Parsimony and maximum-likelihood methods are used to reconstruct ancestral states of their geographical distributions, habitats and lifestyles. Our results support the concept that thelodonts originated during the Middle?–Late Ordovician probably in marine open waters of Laurasia, with a demersal lifestyle on hard substrates being the ancestral condition for the whole clade. Later, thelodonts underwent a complex ecological diversification and palaeobiog…

Bébé compense-t-il la consommation d'un aliment plus ou moins énergétique juste avant le repas ? (ANR PUNCH)

2019

Débuter la diversification alimentaire : une décision influencée par la croissance de l'enfant ?

2019

National audience; Les pratiques d'alimentation des nourrissons sont soumises à des influences multiples. Ainsi, l'âge de début de diversification varie selon de nombreux facteurs comme les caractéristiques maternelles (tabagisme, âge, niveau d'études, corpulence, pays de naissance) ou infantiles (sexe) (Bournez et al., 2017). Nous voulions étudier si cet âge pouvait de plus dépendre de la croissance de l'enfant, et traduire ainsi une sensibilité de la mère à cet aspect du développement. Nous avons envisagé que les enfants les plus grands (ou lourds, ou corpulents) pourraient être diversifiés plus tôt que les enfants de taille « moyenne ». Les données de la cohorte ELFE (Etude Longitudinale…

Déterminants précoces des préférences alimentaires chez l'enfant

2017

type de production : revue; Déterminants précoces des préférences alimentaires chez l'enfant. 33. journées scientifiques de l’association française d’étude et de recherche sur l’Obésite (AFERO)

Coping with rural transition in northern Thailand : an analysis of rural economic diversification and social movements' response

2006

User session level diverse reranking of search results

2018

Most Web search diversity approaches can be categorized as Document Level Diversification (DocLD), Topic Level Diversification (TopicLD) or Term Level Diversification (TermLD). DocLD selects the relevant documents with minimal content overlap to each other. It does not take the coverage of query subtopics into account. TopicLD solves this by modeling query subtopics explicitly. However, the automatic mining of query subtopics is difficult. TermLD tries to cover as many query topic terms as possible, which reduces the task of finding a query's subtopics into finding a set of representative topic terms. In this paper, we propose a novel User Session Level Diversification (UserLD) approach bas…

Diversification in evolutionary arenas - assessment and synthesis

2019

Abstract Understanding how and why rates of evolutionary diversification vary is a central issue in evolutionary biology and ecology. The concept of adaptive radiation has attracted much interest, but is metaphorical and verbal in nature, making it difficult to quantitatively compare different evolutionary lineages or geographic regions. In addition, the causes of evolutionary stasis are relatively neglected. Here we review the central concepts in the evolutionary diversification literature and bring these together by proposing a general framework for estimating rates of diversification and quantifying their underlying dynamics, which can be applied across clades and regions and across spat…

Development of healthy eating in children: from research to public health perspective

2019

International audience

Essential oil crops for sustainable agriculture - A review

2009

Multifunctionality and diversification of farming systems, integration of agricultural practices both inter se and with the non-agricultural productive systems operating on the territory, biodiversity safeguards, and reduction in off-farm inputs, are key factors for all modern development strategies in agricultural areas. Such issues are valid worldwide, but are especially true in areas in which the cultivation of the more widespread and “classical” crops is constrained by factors of varying degree and importance. In Mediterranean areas, where many environmental and economic factors often reduce rural areas to marginal conditions, the search for new crop opportunities has become one of the …