Bird Monitoring in Nelson

Monitoring bird populations helps us understand the health of our ecosystems, track changes over time, and assess how well conservation and pest‑control programmes are working.

Council monitors bird species across selected conservation and landscape reserves to build a picture of what species are present, where they occur, and how populations are changing.

Accurate monitoring helps ensure:

important habitats are protected
conservation efforts are targeted effectively
rare and threatened species are not overlooked
future planning and funding decisions are well informed

*South Island Tomtit Miromiro. Photo credit: P. Cochrane.*

How We Monitor Birds

Bird monitoring is carried out using a method called transect sampling, which provides a consistent and repeatable way to count birds.

Surveys are conducted annually in late spring (October–December)
Monitoring occurs across nine sites in Nelson’s reserves
At each site, observers walk a transect line with multiple counting stations
At each station, birds are recorded for five minutes, based on what is seen and heard

This method allows trends to be compared over time and between locations.

Understanding Bird Types

Birds in Nelson are grouped into three categories:

Endemic – found only in New Zealand (e.g. pīpipi / brown creeper, kakaruwai / robin)
Native – naturally found in New Zealand and elsewhere (e.g. tauhou / silvereye)
Introduced – brought to New Zealand by people (e.g. blackbirds, sparrows, finches)

Endemic species are often more vulnerable to habitat loss and predators, so they are important indicators of ecosystem health.

What We’re Seeing

Between 2015 and 2023, monitoring recorded 35 bird species, including 13 endemic, 8 native, and 14 introduced species. The most commonly observed species was the silvereye (tauhou), followed by introduced species such as chaffinch and blackbird.

Bird distribution varies across the region:

Endemic species are more common in higher altitude, mature native forest, where there are fewer predators and less human disturbance
Introduced species are more common in urban and modified environments
Areas such as Botanical Hill and the Grampians support higher overall diversity, while more remote sites tend to have fewer but more specialised species

Overall bird numbers have increased over time, but trends differ between groups:

Introduced species are the most common and have increased the most in total numbers
Endemic species are increasing at a faster rate but remain less common and more restricted in distribution
Native species show more variation over time

Endemic species typically have slower population growth and are more sensitive to habitat change and predation, making them important indicators of ecosystem health.

These patterns highlight a wider trend where endemic birds are often limited to small, connected areas of intact native forest, particularly at higher elevations. Without effective management, this can lead to:

reduced biodiversity
loss of unique species
simpler and less resilient ecosystems

*Silvereye Tauhou. Photo credit: P. Cochrane*

See Table: Bird Monitoring Results - Total counts for each Bird species

Other Species Not Detected

Some bird species known to occur in the Nelson region were not recorded during these surveys. These include species such as kākā, ruru (morepork), and koekoeā (long‑tailed cuckoo).

There are several reasons why these species may not have been detected:

they may be present in low numbers or outside survey areas
some species are nocturnal, quiet, or difficult to detect
individuals may have been active at different times or locations

Additional records of these species are available through other monitoring and citizen science platforms such as eBird, iNaturalist, and the Global Biodiversity Information Facility (GBIF).

What We’re Doing

Council is supporting bird populations through monitoring, conservation initiatives, and long‑term planning, including:

coordinating pest control through programmes such as the Nelson Nature Halo
supporting community trapping groups in key areas
establishing baseline data to track changes over time
working with iwi and partners to support biodiversity outcomes
improving pest control in priority habitats
protecting and reconnecting areas of native forest
reviewing monitoring approaches and strengthening ecological research
planning for long‑term challenges such as climate change
encouraging community involvement in conservation

Monitoring shows that protecting endemic bird species will require continued and increased effort. New tools and technologies, along with national initiatives such as Predator Free 2050, are expected to play an important role in supporting future outcomes.

What You Can Do

You can help support bird populations and improve monitoring outcomes across Nelson by:

supporting or getting involved in community trapping and predator control programmes
protecting and planting native vegetation in gardens and on properties
creating bird‑friendly habitats with food sources and shelter
reporting bird sightings through platforms such as eBird or iNaturalist
reducing disturbance to birds, especially during the breeding season
keeping pets responsibly, including controlling cats to reduce predation

Small actions across many properties and communities can make a significant difference, particularly for endemic species that are more vulnerable to habitat change and predators.

Check out all the ways you can get involved in protecting our nature - What You Can Do