Ancient DNA can teach us a great deal about prehistoric life. So why is it so troublesome? (Image Credit: Flying Puffin, CC BY-SA 2.0)
When we’ve talked about type specimens on Ecology for the Masses, we‘ve spent a lot of time emphasising how important it is to preserve them. Bottom line is, if they get destroyed, there are a lot of really important biological questions that become very difficult to answer.
Thankfully, landmark leaps in technology have made it possible to extract DNA from those specimens and store them in a public repository (e.g. the NCBI nucleotide database). So then even if a specimen is lost, the DNA would still be there and could be compared to that of other specimens to figure out if it’s the same species. Sounds like a clever and straightforward thing to do, but as always, it’s more complicated in reality.
Image Credit: billp1969, Pixabay licence, Image Cropped
You might have come across the word “subspecies” when reading about biodiversity, but what does the term actually mean? And do we really need a more precise classification beyond species? There is unfortunately no consensus about this. Ask 5 biologist and you’ll get at least 10 different answers. So let’s have a look at why it’s such a complicated issue.
Museum collections may seem like they’re just for display, but they often house important biological information (Image Credit: Andrew Moore, CC BY-SA 2.0, Image Cropped)
Last September, the devastating news of a fire in Brazil’s National Museum in Rio de Janeiro hit the world. The fire destroyed most of the collection, including about 5 million insect specimens. Many of the samples were holotypes, a subset of type specimens which are particularly valuable to the scientific world. If you want an indication of just how valuable, some researchers even charged back into the building while it was on fire to rescue these specimens, saving about 80 % of the mollusc holotypes.
Image Credit: Sue Sweeney, CC BY-SA 3.0, Image Cropped.
In this series, we’ve already learnt about the impacts of alien trees and garden plants in Norway, but others are invading too, including some that are easier to overlook. And some of them can not only out-compete native species, but also pose health problems for humans. In today’s guest post by Vanessa Bieker, we look at Ambrosia artemisiifolia (common ragweed), which produces highly allergenic pollen and is one of the main causes of hay fever.