Dictionary > Australasia realm

Australasia realm

Definition
noun
A biogeographic realm that covers Australia, New Guinea, New Zealand, and neighbouring islands
Supplement
Biogeographic realms are large spatial regions of the Earth’s land surface. Studying biogeographic realms leads to insight especially on biodiversity. It provides understanding on the extent of biodiversity and the factors that affect it. At present, there are about eight realms recognized by the World Wildlife Fund and they are divided according to their ecosystems sharing similar biological evolutionary history and distributional patterns of terrestrial organisms. The eight biogeographic realms are Nearctic realm, Palaearctic realm, Neotropical realm, Afrotropic realm, Indomalayan realm, Australasia realm, Oceanian realm, and Antarctic realm.
The Australasia realm (about 7.6 million square kilometres) includes Australia, New Guinea, New Zealand, eastern of the Indonesian archipelago, Bismarck Archipelago, Vanuatu, the Solomon Islands, and New Caledonia. This realm shares similar flora with the Antarctic realm. Nevertheless, the northern tropical islands share similar flora with the Southeast Asia. The Wallace Line serves as the biological dividing line from the Indomalayan realm of tropical Asia.1 This boundary (named after the British naturalist Alfred Russel Wallace) acts as a transitional zone between Asia and Australia.
See also:

Reference(s):

1 Australasian realm. Retrieved from ://en.wikipedia.org/wiki/Australasian-realm.


You will also like...

Birth Control and Contraception
Birth Control and Contraception

Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..

Biological Cell schematic diagram
Biological Cell Introduction

It only takes one biological cell to create an organism. A single cell is able to keep itself functional through its 'mi..

3D rendering of an antibody
Passive and Active Types of Immunity

Lymphocytes are a type of white blood cell capable of producing a specific immune response to unique antigens. In thi..

Ploidy
Polyploidy

Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howeve..

Adaptive Radiation
Adaptive Radiation

The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant ad..

Schematic diagram of DNA replication
DNA Structure & DNA Replication

DNA is a double helix structure comprised of nucleotides. A nucleotide, in turn, is made up of phosphate molecule, deoxy..