Accueil > Communication > Newsletter scientifique > Publications

Publications RSS des Publications

Page(s) : < | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ... | 197 |

16 octobre 2017

Warm northern river temperatures increase post-exercise fatigue in an Arctic migratory salmonid but not in a temperate relative [Functional Ecology]

Keywords : Arctic char, Arctic climate change, northern range expansion ; salmonid migration ; repeat swimming performance, temperature tolerance, oxygen uptake

1.The arctic is warming at twice the global average rate ; how native and non-native anadromous fishes will respond remains largely unknown. Some native arctic salmonids are already experiencing warm (>21°C), physically challenging migratory river conditions and large diurnal temperature fluctuations (>10°C).

2.We conducted field and laboratory experiments to determine how these extreme conditions may affect the capacity for migration in arctic and temperate salmonids.

Lire la suite

16 octobre 2017

Native ladybird decline caused by the invasive harlequin ladybird Harmonia axyridis : evidence from a long-term field study [Insect Conservation & Diversity]

Keywords : Adalia bipunctata, biological control, Coccinellidae, Harmonia axyridis, intraguild predation, invasive species, non-target effects

1.Harmonia axyridis (Pallas) (Coleoptera : Coccinellidae) is regarded as an invasive non-native species in Europe, where it has been spreading rapidly since the early years of the 21st century.
2.This study examines changes in ladybird communities at four sites (two lime tree sites, one pine tree site and one nettle site) in East Anglia, England, over an 11-year period (2006–2016) following invasion by H. axyridis.(...)

Lire la suite

16 octobre 2017

Ecological plant epigenetics : Evidence from model and non-model species, and the way forward [Ecology Letters]

Keywords : bioinformatics, ecological epigenetics, genomics, phenotypic plasticity, response to environment

Growing evidence shows that epigenetic mechanisms contribute to complex traits, with implications across many fields of biology. In plant ecology, recent studies have attempted to merge ecological experiments with epigenetic analyses to elucidate the contribution of epigenetics to plant phenotypes, stress responses, adaptation to habitat, and range distributions. While there has been some progress in revealing the role of epigenetics in ecological processes, studies with non-model species have so far been limited to describing broad patterns based on anonymous markers of DNA methylation. In contrast, studies with model species have benefited from powerful genomic resources, which contribute to a more mechanistic understanding but have limited ecological realism. (...)

Lire la suite

16 octobre 2017

Stochastic variation in the initial phase of bacterial infection predicts the probability of survival in D. melanogaster [eLife]

David Duneau & Jean-Baptiste Ferdy

A central problem in infection biology is understanding why two individuals exposed to identical infections have different outcomes. We have developed an experimental model where genetically identical, co-housed Drosophila given identical systemic infections experience different outcomes, with some individuals succumbing to acute infection while others control the pathogen as an asymptomatic persistent infection. We found that differences in bacterial burden at the time of death did not explain the two outcomes of infection. Inter-individual variation in survival stems from variation in within-host bacterial growth, which is determined by the immune response. We developed a model that captures bacterial growth dynamics and identifies key factors that predict the infection outcome : the rate of bacterial proliferation and the time required for the host to establish an effective immunological control. Our results provide a framework for studying the individual host-pathogen parameters governing the progression of infection and lead ultimately to life or death.

Lire la suite

13 octobre 2017

Attractiveness of wildflower mixtures for wild bees and hoverflies depends on some key plant species [Insect Conservation & Diversity]

Keywords : Apoidea, flowering fields, greening, habitat fragmentation, pollinator loss, supporting ecosystem services, Syrphidae, wildflower plantings, wildflower strips

1.Agricultural intensification is considered to be a major driver of terrestrial biodiversity decline. Resulting loss, isolation and degradation of flower-rich habitats are threatening pollinators. Agri-environmental schemes (AES) aim to counteract these negative effects, including measures to enhance floral resources in agricultural landscapes. The impact of plant species composition on their efficiency to mitigate pollinator loss, however, is largely unexplored.
2.We tested four recommended seed mixtures for their attractiveness to wild bees and hoverflies in a replicated plot design over two consecutive years against the background of the seedbank.(...)

Lire la suite

Page(s) : < | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ... | 197 |