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tree : a woody perennial plant having a single usually elongate main stem generally with few or no branches on its lower part — Webster
Tree is a perennial plant with an elongated stem, or trunk, supporting branches and leaves in most species. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are usable as lumber or plants above a specified height. Trees are not a taxonomic group but include a variety of plant species that have independently evolved a woody trunk and branches as a way to tower above other plants to compete for sunlight. In looser senses, the taller palms, the tree ferns, bananas and bamboos are also trees. Trees tend to be long-lived, some reaching several thousand years old. The tallest known tree, a coast redwood named Hyperion, stands 115.6 m (379 ft) high. Trees have been in existence for 370 million years. — Wikipedia
Trees News -- ScienceDaily Read all about trees, including the latest research on many tree species, insect infestations, and the role of trees in ecology. Full articles, photos, free.
When the dinosaurs died, so did forests -- and...
on May 24, 2018 at 6:17 pm
Sixty-six million years ago, the world burned. An asteroid crashed to Earth with a force one million times larger than the largest atomic bomb, causing the extinction of the dinosaurs. But dinosaurs weren't the only ones that got hit hard -- in a new study, scientists learned that the planet's forests were decimated, leading to the extinction of tree-dwelling birds. […]
Most comprehensive tree of life for malaria...
on May 23, 2018 at 5:12 pm
A new study puts forth the most comprehensive tree of life for malaria parasites to date. Among the researchers' findings is that the diverse malaria parasite genus Plasmodium (which includes those species that infect humans) is composed of several distantly related evolutionary lineages, and, from a taxonomic standpoint, many species should be renamed. […]
Long-term study reveals one invasive insect can...
on May 23, 2018 at 1:12 pm
Eastern hemlock forests have been declining due to a non-native insect pest. A new study presents some of the best data showing how the decline of a single tree species leads to the disappearance of birds specialized to them. The data also indicate birds associated with non-hemlock habitat features are spreading into former hemlock forests. A single insect species has led to a less diverse bird community across this landscape. […]
The chestnut gall wasp -- The threat of an...
on May 21, 2018 at 6:38 pm
A molecular study carried out on the chestnut gall wasp, Dryocosmus kuriphilus, has revealed the absence of genetic variability in this invasive species, a chestnut-tree parasite, in Europe. This is due to the fact that the wasp's reproduction is strictly parthenogenetic, the females produce more females without having to be fertilized by a male. The high capacity of reproduction of the females, producing genetically identical daughters, give this insect a high invasive potential. […]
Deadly malaria's evolution revealed
on May 21, 2018 at 5:18 pm
The evolutionary path of the deadliest human malaria parasite, Plasmodium falciparum, has been revealed for the first time. This parasite is a member of the Laverania parasite family that only infect the great apes including humans, chimpanzees and gorillas. Scientists estimate that Plasmodium falciparum emerged as a human-specific parasite species earlier than previously thought. […]