Supervisory authorities

CNRS

Our LABEX

Our Networks

Search




Visitors logged in: 9


Home > Communication > Scientific newsletter > Publications

Publications Publications feed

Page(s) : < | 1 | ... | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ... | 146 |

8 March 2017

A fitness trade-off between seasons causes multigenerational cycles in phenotype and population size [eLIFE]

Although seasonality is widespread and can cause fluctuations in the intensity and direction of natural selection, we have little information about the consequences of seasonal fitness trade-offs for population dynamics. Here we exposed populations of Drosophila melanogaster to repeated seasonal changes in resources across 58 generations and used experimental and mathematical approaches to investigate how viability selection on body size in the non-breeding season could affect demography. (...)

Read more

8 March 2017

Molecular substitution rate increases with latitude in butterflies: evidence for a trans-glacial latitudinal layering of populations? [Ecography]

A well-documented consequence of repeated global ice ages is the negative relationship between latitude and intraspecific genetic diversity. However, little is known about additional effects of such major climatic events on population genetic structure. Here we studied the phylogeographic structure of five lycaenid butterfly species with varied ecological adaptations, sampled across a latitudinal gradient in the Holarctic region. We found a positive correlation between latitude and substitution rate of mitochondrial DNA sequences in all species investigated.(...)

Read more

8 March 2017

Assessing soil biodiversity potentials in Europe [Science of The Total Environment]

Soil is important as a critical component for the functioning of terrestrial ecosystems. The largest part of the terrestrial biodiversity relies, directly or indirectly, on soil. Furthermore, soil itself is habitat to a great diversity of organisms. The suitability of soil to host such a diversity is strongly related to its physico-chemical features and environmental properties. However, due to the complexity of both soil and biodiversity, it is difficult to identify a clear and unambiguous relationship between environmental parameters and soil biota. Nevertheless, the increasing diffusion of a more integrated view of ecosystems, and in particular the development of the concept of ecosystem services, highlights the need for a better comprehension of the role played by soils in offering these services, including the habitat provision.(...)

Read more

7 March 2017

Models projecting the fate of fish populations under climate change need to be based on valid physiological mechanisms [Global Change Biology]

Keywords : aerobic scop, gill surface area, growth, metabolism, oxygen consumption, respiration, scaling

Some recent modelling papers projecting smaller fish sizes and catches in a warmer future are based on erroneous assumptions regarding (i) the scaling of gills with body mass and (ii) the energetic cost of ‘maintenance’. Assumption (i) posits that insurmountable geometric constraints prevent respiratory surface areas from growing as fast as body volume. It is argued that these constraints explain allometric scaling of energy metabolism, whereby larger fishes have relatively lower mass-specific metabolic rates. Assumption (ii) concludes that when fishes reach a certain size, basal oxygen demands will not be met, because of assumption (i). We here demonstrate unequivocally, by applying accepted physiological principles with reference to the existing literature, that these assumptions are not valid.(...)

Read more

7 March 2017

Bumblebees can discriminate between scent-marks deposited by conspecifics [Scientif Reports]

Keywords : animal behaviour, behavioural ecology

Bumblebees secrete a substance from their tarsi wherever they land, which can be detected by conspecifics. These secretions are referred to as scent-marks, which bumblebees are able to use as social cues. Although it has been found that bumblebees can detect and associate scent-marks with rewarding or unrewarding flowers, their ability at discriminating between scent-marks from bumblebees of differing relatedness is unknown. We performed three separate experiments with bumblebees (Bombus terrestris), where they were repeatedly exposed to rewarding and unrewarding artificial flowers simultaneously.(...)

Read more

Page(s) : < | 1 | ... | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ... | 146 |