biology

Invasive species in New Zealand

Invasive species in New Zealand is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Invasive species in New Zealand rather than just read about it. In short: A number of introduced species, some of which have become invasive species, have been added to New Zealand's native flora and fauna. Both deliberate and accidental introductions have been made from the time of the first human settlement, with several waves of Polynesian people at some time before the year 1300, followed by Europeans after 1769.

Key takeaways

Invasive species in New Zealand belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Invasive species in New Zealand to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Invasive species in New Zealand from memory before moving on to harder problems.

Reference excerpt

A number of introduced species, some of which have become invasive species, have been added to New Zealand's native flora and fauna. Both deliberate and accidental introductions have been made from the time of the first human settlement, with several waves of Polynesian people at some time before the year 1300, followed by Europeans after 1769. Almost without exception, the introduced species have been detrimental to the native flora and fauna, but some, such as farmed sheep and cows and the clover upon which they feed, now form a large part of the economy of New Zealand. The possibility of introduced herbivores (deer) to serve as ecological proxies for extinct moa has been questioned. Biosecurity New Zealand maintains registers and lists of species that are invasive, potentially invasive, or a threat to agriculture or biodiversity. They also manage a small number of species under the National Interest Pest Responses (NIPR) programme. The rainbow lorikeet is the one animal that has been covered by the NIPR, and was eradicated in 2014. All the other species covered by the NIPR, past or present, are weeds.

Animal species

Many invasive animal species are listed in schedules 5 and 6 of the Wildlife Act 1953. Those in Schedule 5 have no protection and may be killed. Those in Schedule 6 are declared to be noxious animals and subject to the Wild Animal Control Act 1977. In 2016 the New Zealand government introduced Predator Free 2050, a project to eliminate all non-native predators (such as rats, possums and stoats) by 2050. Some of the invasive animal species are as follows.

Plant and other non-animal species The National Pest Plant Accord, with a listing of about 120 genus, species, hybrids and subspecies, was developed to limit the spread of plant pests. Invasive plants are classified as such on a regional basis with some plants declared as national plant pests. Biosecurity New Zealand manages a small number of weeds under the National Interest Pest Responses programme. As of May 2024, NIPR covers nine weeds. Hornwort (Ceratophyllum demersum) was covered until it was eradicated in 2014. Additionally, as at 2024 the Department of Conservation lists 386 vascular plant species as environmental weeds. Some of the better-known invasive plant species are:

Auckland has been declared to be the weediest city in the world.

See also Fauna of New Zealand Invasive species of New Zealand origin

Animals in New Zealand Gypsy moths in New Zealand – Lymantria dispar dispar in New ZealandPages displaying short descriptions of redirect targets Painted apple moth in New Zealand – Invasive moth species in New Zealand

Plants in New Zealand Blue morning glory in New Zealand – Species of flowering plantPages displaying short descriptions of redirect targets Wilding conifer – Invasive trees in New Zealand

References

Further reading Allen, Robert B.; Lee, William G., eds. (2006). Biological Invasions in New Zealand. Berlin: Springer. ISBN 3-540-30022-8. Fisher, Mark; Salmond, Anne (2025). A Land before Humans, a Land after Humans. Great Easton: Unbreaking. ISBN 9781917159050. Hackwell, Kevin (1999). Pests & Weeds: The Cost of Restoring an Indigenous Dawn Chorus: A Blueprint for Action Against the Impacts of Introduced Pest Organisms on the New Zealand Environment. Wellington [N.Z.]: New Zealand Conservation Authority. ISBN 0-9583301-8-2. King, Carolyn M. (1985). Immigrant Killers: Introduced Predators and the Conservation of Birds in New Zealand. Auckland: Oxford University Press. ISBN 978-0-19-558115-7. King, Carolyn M., ed. (1993). "The Great Lake Pest Summit - Proceedings of the National Mammalian Pest Forum, May 1993". New Zealand Journal of Zoology. 20 (4). Royal Society of New Zealand. doi:10.1080/03014223.1993.10420365. ISSN 0301-4223. Kirk, T. (1895). "The displacement of species in New Zealand". Transactions of the New Zealand Institute. 28: 1–27. Rahman, Anis and Ian Popay (1 August 2001). "Review of emerging weed problems in hill country pastures". Archived from the original on 10 January 2011. Thomson, George Malcolm (1922). The naturalisation of animals & plants in New Zealand. England: Cambridge University Press. doi:10.5962/bhl.title.55364. Retrieved 2 April 2016. Timmins, S; Williams, P. (1991). "Weed numbers in New Zealand's forest and scrub reserves" (PDF). New Zealand Journal of Ecology. 15 (2). New Zealand Ecological Society: 153–162. "The Future of Pest Management in New Zealand: A Think Piece" (PDF). Local Government New Zealand. August 2008. Archived from the original (PDF) on 23 July 2011. Retrieved 25 March 2011. New Zealand Plant Protection Society (2004). An illustrated guide to common weeds of New Zealand / Bruce Roy ... [et.al.] (2nd ed.). Lincoln, Canterbury, N.Z: New Zealand Plant Protection Society. ISBN 0473097605.

External links "Biosecurity New Zealand". Ministry for Primary Industries. Retrieved 26 January 2026. "Official New Zealand Pest Register". Ministry for Primary Industries. Retrieved 26 January 2026- searchable database at the Ministry for Primary Industries{{cite web}}: CS1 maint: postscript (link) "Pests and threats". Department of Conservation. Retrieved 26 January 2026. "Information on plant pests". Weedbusters New Zealand. Retrieved 26 January 2026. Publications What's New in Biological Control of Weeds?, Landcare Research, ISSN 1177-8784 "Kararehe Kino/ Vertebrate Pest Research Newsletter", Kararehe Kino = Vertebrate Pest Research, Landcare Research, ISSN 1170-3016, archived from the original on 6 June 2012, retrieved 14 June 2012

Illustrations

Worked examples

Example 1 — a first encounter with Invasive species in New Zealand

Start with the simplest possible case. Write down what Invasive species in New Zealand claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Invasive species in New Zealand before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Invasive species in New Zealand ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Invasive species in New Zealand

In research: Invasive species in New Zealand appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Invasive species in New Zealand in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Invasive species in New Zealand is common in secondary-school and first-year university syllabi. It links to neighbouring topics Invasive species in New Zealand, Lists of biota of New Zealand, Lists of invasive species, so understanding it makes those chapters shorter.
In everyday life: Look for Invasive species in New Zealand outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Invasive species in New Zealand in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Invasive species in New Zealand means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Invasive species in New Zealand out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Invasive species in New Zealand in simple terms?

Why does Invasive species in New Zealand matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Invasive species in New Zealand?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Invasive species in New Zealand.