Review Article

Gumlands are a critically endangered ecosystem, restricted to Auckland and Te Tai Tokerau (Northland) in Aotearoa | New Zealand. Gumlands usually form in areas once dominated by kauri, where slow decomposition produces poorly drained, infertile soils with a siliceous hardpan. These harsh edaphic conditions result in heathlands dominated by mānuka (Leptospermum scoparium agg.), tangle fern (Gleichenia dicarpa), and sedges (Machaerina teretifolia and M. brevifolia).

In New Zealand, intensive, site-based conservation management of bird species is often focused on controlling threats from invasive species at a local scale. Such management may benefit species resident within the site but may be insufficient for mobile taxa whose movements extend beyond it through annual migrations, irregular nomadic movements, or exchanges of dispersing individuals in metapopulation networks.

There have been numerous declines and extinctions of native fauna in Aotearoa New Zealand since human settlement. Against this background of loss there have been remarkable advances in conservation management, including the use of conservation translocations to reduce extinction risk and restore depauperate ecosystems. Here we review conservation translocations in Aotearoa New Zealand.

Management of invasive mammal pests plays an integral role in the conservation of New Zealand’s native flora and fauna. Models fitted to pest capture data can guide conservation managers by providing estimates of pest densities within a management area, or probabilities of absence for declaring local eradication. A key parameter of these models is the detectability, i.e. the probability of an animal being detected by a surveillance device for a given amount of survey effort.

Cats (Felis catus) are among the most damaging invasive predators in the world, and their impacts in Aotearoa New Zealand (NZ) are particularly severe. However, unlike the invasive predators that are targeted for eradication under the Predator Free NZ initiative, cats are also highly valued by people and therefore will likely remain widespread in NZ for the foreseeable future. This raises the question of how to manage the impacts of cats, which include predation, competition, and disease affecting native species, livestock, and humans.

Translocations are becoming increasingly common although the effectiveness of this conservation tool for amphibians is highly variable. We reviewed ten translocations of Leiopelma frogs occurring between 1924 and 2016. Data were gathered on factors which may have influenced translocation outcomes. Results at each location were measured against an established four-step framework for stages of success: survival of individuals, reproduction, population growth, and population viability.

Understanding the ecology of cryptic species is essential for designing effective monitoring and conservation strategies. Leiopelma archeyi is a native New Zealand frog with cryptic colouration, patterning, and behaviour. Our study examined dorsal colour variation and climbing behaviour in this species. Our first aim was to investigate if L. archeyi demonstrates colour crypsis by background-matching. Secondly, we determined if green pigmentation is lost as frogs age by comparing frog body size (a proxy for age) with the percentage of green on their dorsal surface.

Microbiome research is revealing the profound effects that microbial inhabitants can have on their animal hosts. Recent and rapid advances in sequencing technologies have allowed biologists to characterise the microbial constituents of a variety of host organisms, giving greater insights into these intimate relationships than ever before. For many animal species, microbiomes serve as an interface between host and environment, with associated microorganisms playing functional roles in nutrition, immunity, reproduction, and even behaviour.

The desire for ecosystem restoration and native forest expansion is growing internationally. Transitional forestry, where an exotic plantation forest is transitioned to a native forest, is a potential method of native forest restoration and carbon sequestration that is gaining interest in Aotearoa New Zealand. However, it is currently unknown whether this approach can produce a permanent native forest ecosystem and how representative of remnant native forest it could be.