Our very long and laborious project to understand processes and drivers of the flour beetle microbiome has finally come to an end! Through a huge team effort by many members of the lab over several years, we figured out why, and how much, the flour beetle microbiome varies. In brief, we found that the microbiome... Continue Reading →
Organisms have to deal with many kinds of costs, but dissecting and quantifying each of them, and how they affect adaptation and evolution, is tricky. This is especially true when some costs are "internal" (e.g., due to deleterious mutations) and some are "external" (environmental). In a study led by former postdoc Laasya Samhita (now Assistant... Continue Reading →
The first set of findings from our long-term beetle populations are now out! In a massive effort, collating data across over 5 years, Vrinda and other lab members monitored flour beetle populations exposed to a new, poor habitat — corn flour — instead of the optimal ancestral wheat flour. While we expected some extinction, nearly all... Continue Reading →
Mutations are central for evolution, and recent work has suggested that the type of mutations sampled by organisms may be important for evolution. Earlier work from our lab and that of Lindi Wahl suggested that flipping a long-term mutational bias should be generally beneficial, by allowing populations to sample unexplored mutational space. We have now... Continue Reading →
Many key molecules in our cells are specific enantiomers, and their mirror image forms are not found in living beings. For instance, the sugars in DNA are all left-handed, while amino acids are right-handed. For decades, scientists have wondered whether a completely "flipped" mirror organism would be viable and how it would function. With major... Continue Reading →
Some of the most famous time series in population ecology describe beautiful oscillations in population size, including our favourite flour beetles. Even in the absence of external forces (such as predation) such oscillations are not uncommon, and are typically attributed to negative density dependence. As populations become more crowded, the growth rate drops, and this... Continue Reading →
Our recently completed multi-year project suggests that there is no straight answer to this question! We sampled the leaves of different rice varieties across 3 years, finding that bacterial communities that live inside vs. on the surface of leaves differ in many ways, and over time. As expected from greater exposure to environmental influences (including... Continue Reading →
A new study led by Tapomoy Bhattacharjee's group shows that rods vs. cocci grow in distinct ways in porous 3D matrices, and these differences make rods more robust to increasing matrix viscosity. Bacteria in natural habitats likely live in such matrices; indeed, the bacteria used in this study were isolated from flour beetle guts in our... Continue Reading →
