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Identifying insect species crucial

Identifying insect species crucial to protect the environment

Students at Lincoln University are covering the length and breadth of New Zealand to discover new insect species and keep ahead of potential threats to agriculture and the environment.

Bio-Protection Research Centre students, Francesco Martoni, Samuel Brown and Hamish Patrick have visited mountains, grasslands and forests to collect insect specimens. They have identified about 50 new species.

“This research, to understand what [insects] are present in New Zealand, is vital for us to recognise any change. Especially if it involves the introduction of species that may become pests, or spread disease,” says Dr Karen Armstrong, a Senior Researcher at Lincoln University, and the students’ supervisor.

“The only way to stay ahead of this, and to detect damaging interactions, is to know what is here. And for that, we need to produce experts in traditional taxonomy who are also trained to use modern technological approaches to describe and discover [insect species],” says Dr Armstrong.

Martoni has collected psyllids from more than 200 locations, identifying more than 60 different species. Brown has described more than 40 species of native weevil. Patrick, besides having found and identified one new species of picture wing fly during a Lincoln Summer Scholarship, and four new species of New Zealand’s rare black mountain ringlet butterflies during his honours degree at Lincoln, is now researching how species that are very closely related to the highly invasive Queensland fruit fly can be distinguished.

Expertise in taxonomy is vital for the future acknowledges Dr Armstrong. While most of the insects identified by the students are native to New Zealand, one weevil is a relatively recent introduction from Europe not previously known to occur here. By comparing this weevil with unidentified specimens held in local collections, Brown discovered that it first arrived in New Zealand in 1996. This research was published recently in the “New Zealand Journal of Zoology.

Brown explains that predicting the impact of a newly introduced species is difficult. “This introduced weevil is only found in low numbers, but is already widely dispersed in the eastern South Island. It feeds on native species, so its numbers should be monitored in conservation areas.”

New Zealand has stringent biosecurity, but it is impossible to prevent every incursion. While most species are not harmful, some insects that have established in the country, such as the Argentine stem weevil, clover root weevil and tomato potato psyllid, are damaging to the country’s economy and environment.

“These discoveries highlight how important it is to have experts out collecting, accurately identifying, and cataloguing insects,” explains Brown “By depositing specimens in insect collections we can quickly identify new species in the future.”

The students have archived specimens of their identified insects in national insect collections held at Lincoln University, Landcare Research Manaaki Whenua and the Museum of New Zealand Te Papa Tongarewa.


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