(McGill) Findings in a new report show that environmental changes caused by humans are leading to changes in genetic variation in thousands of species of birds, fish, insects, and mammals. The evidence for human impacts was most clear for insects and fish species.
(NewScientist) The hybridization can threaten the long-term survival of the native bees, says Ignasi Bartomeus at the Doñana Biological Station in Seville, Spain. “Diversity is the best insurance against [environmental] perturbations because it creates variability from which to adapt to new situations,” he says. “If we homogenize the genetic diversity of some species, we are losing this insurance.”
(ScienceDaily) Researchers sequenced the genomes of the two Varroa mite species that parasitize the honey bee. They found that each species of mite used its own distinct strategy to survive in its bee host, potentially overwhelming the bees’ defenses. In addition to pointing to how scientists might vanquish these deadly intruders, the findings also shed light on how parasites and hosts evolve in response to one another.
(Phys.org) Scientists have known for a long time that vertebrates handle positive and negative events differently, storing and retrieving those memories in their brains differently, as well. To find out if the same is true for invertebrates, they exposed honey bees to positive or negative events and then studied gene expression in a part of their brain known as the mushroom body.
(Penn State) “There is exceptional diversity in coloration of bumble bees.” But similar coloration in different species are not necessarily the result of similar gene expression.