Mammalian intestinal allometry, phylogeny, trophic level and climate

Allometry and size in ontogeny and phylogeny.

Mammalian phylogeny: Genes and supertrees

A massive effort to sample mammals for genes has yielded new proposals for the branching architecture of the great radiation of placental mammals. Some of these are notably discrepant with morphologically based analyses, but they suggest new research that should address several major outstanding issues.

Trophic amplification of climate warming

Ecosystems can alternate suddenly between contrasting persistent states due to internal processes or external drivers. It is important to understand the mechanisms by which these shifts occur, especially in exploited ecosystems. There have been several abrupt marine ecosystem shifts attributed either to fishing, recent climate change or a combination of these two drivers. We show that temperatu...

Bats and Rodents Shape Mammalian Retroviral Phylogeny

Endogenous retroviruses (ERVs) represent past retroviral infections and accordingly can provide an ideal framework to infer virus-host interaction over their evolutionary history. In this study, we target high quality Pol sequences from 7,994 Class I and 8,119 Class II ERVs from 69 mammalian genomes and surprisingly find that retroviruses harbored by bats and rodents combined occupy the major p...

Allometry of the mammalian intracellular pulmonary surfactant system.

Alveolar epithelial (AE) surface area is closely correlated with body mass (BM) in mammals. The AE is covered by a surfactant layer produced by alveolar epithelial type II (AE2) cells. We hypothesized that the total number of AE2 cells and the volume of intracellular surfactant-storing lamellar bodies (Lb) are correlated with BM with a similar slope as AE surface area. We used light and electro...