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island-conservation-new-zealand-weka-feat

Researchers Indentify Two Sub-species of Weka

Researchers identify two distinct sub-species of Weka when previously there were believed to be six.

Scientific understanding of species is constantly evolving. In New Zealand and on islands around the world, questions frequently arise about what is a species versus a sub-species.

In New Zealand many species have differentiated into North Island and South Island species, but not all have and for some, the jury is still out. Until a recent study, the verdict for the Weka had not yet been determined. The flightless bird is found on both the New Zealand mainland and surrounding off-shore islands including Stewart and Chatham Islands.

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New Zealand Weka. Credit: Raffaella Traniello

Previously the species had been loosely defined as six sub-species based on color variation but new data suggests there are only two sub-species: Gallirallus australis greyi on the North Island and Gallirallus australis australis on the South Island. Professor Steve Trewick, lead author on the study explained:

…We now have evidence that when the north and south were connected by land, the two subspecies still didn’t mix enough to join the two populations.

Weka chick. Credit: Nuytsia@Tas

The study evaluated a number of New Zealand’s rare and endangered birds to understand their evolution and clarify their statuses as unique species. Although defining species is based on a human projection of differences, it is valuable to conservation efforts and understanding of species populations. It can help tailor conservation efforts to a whole species, a sub-species, or a population that is threatened by invasive predators, climate change, or other biodiversity threats.

As researchers delve further into the understanding of species, findings aid and inform conservation decisions for rare and endangered species throughout the world.

Featured Photo: A Weka, also known as a Woodhen. Credit: Pierre-mary Thibault
Source: New Zealand Herald

About Emily Heber

Emily is a recent graduate from UC Santa Barbara with a BS in Zoology. As a student, she discovered that she had a passion for the conservation of endangered species and their ecosystems. Her background in informal education has allowed her the opportunity to share her passion for animals with others, something she seeks to continue doing while working with the communication team. In her spare time, Emily enjoys exploring the amazing hiking trails found in Santa Cruz and tries to SCUBA dive whenever possible. Emily is excited to join the Island Conservation team and to help share the amazing work that is being done here.

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