Effect of supplementary feeding on reproductive success of hihi (stitchbird, Notiomystis cincta) at a mature forest reintroduction site

Doerr, Lydia R.; Richardson, Kate; Ewen, John G.; Armstrong, Doug

doi:10.20417/nzjecol.41.15

Cited by 10 publications

(9 citation statements)

References 24 publications

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“…Because reintroductions of the Stitchbird to Maungatautari continued into the late period (Doerr et al. 2017), the population response for this species therefore included recently released individuals. Population responses were not given for reintroduced species that were not encountered in the late period (Tomtit in Zealandia, Kaka in Maungatautari).…”

Section: Methodsmentioning

confidence: 99%

“…For projects where bird species were reintroduced to a site (Zealandia and Maungatautari [ Table 2]), the early period was chosen as the year or years immediately before reintroductions of the species occurred. Because reintroductions of the Stitchbird to Maungatautari continued into the late period (Doerr et al 2017), the population response for this species therefore included recently released individuals. Population responses were not given for reintroduced species that were not encountered in the late period (Tomtit in Zealandia, Kaka in Maungatautari).…”

Section: Analysesmentioning

confidence: 99%

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Responses of New Zealand forest birds to management of introduced mammals

Fea

Linklater

Hartley

2020

Conservation Biology

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Over the past 1000 years New Zealand has lost 40-50% of its bird species, and over half of these extinctions are attributable to predation by introduced mammals. Populations of many extant forest bird species continue to be depredated by mammals, especially rats, possums, and mustelids. The management history of New Zealand's forests over the past 50 years presents a unique opportunity because a varied program of mammalian predator control has created a replicated management experiment. We conducted a meta-analysis of population-level responses of forest birds to different levels of mammal control recorded across New Zealand. We collected data from 32 uniquely treated sites and 20 extant bird species representing a total of 247 population responses to 3 intensities of invasive mammal control (zero, low, and high). The treatments varied from eradication of invasive mammals via ground-based techniques to periodic suppression of mammals via aerially sown toxin. We modeled population-level responses of birds according to key life history attributes to determine the biological processes that influence species' responses to management. Large endemic species, such as the Kaka (Nestor meridionalis) and New Zealand Pigeon (Hemiphaga novaeseelandiae), responded positively at the population level to mammal control in 61 of 77 cases for species ࣙ20 g compared with 31 positive responses from 78 cases for species <20 g. The Fantail (Rhipidura fuliginosa) and Grey Warbler (Gerygone igata), both shallow endemic species, and 4 nonendemic species (Blackbird [Turdus merula], Chaffinch [Fringilla coelebs], Dunnock [Prunella modularis], and Silvereye [Zosterops lateralis]) that arrived in New Zealand in the last 200 years tended to have slight negative or neutral responses to mammal control (59 of 77 cases). Our results suggest that large, deeply endemic forest birds, especially cavity nesters, are most at risk of further decline in the absence of mammal control and, conversely suggest that 6 species apparently tolerate the presence of invasive mammals and may be sensitive to competition from larger endemic birds.

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Section: Methodsmentioning

confidence: 99%

Section: Analysesmentioning

confidence: 99%

Responses of New Zealand forest birds to management of introduced mammals

Fea

Linklater

Hartley

2020

Conservation Biology

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“…For example, interventions may include provision of supplementary feed (e.g., Doerr et al. 2017), removal of dominant individuals from over‐represented lineages (e.g., Hogg et al. 2020), introduction of unrelated individuals to reduce inbreeding (e.g., Poirier et al.…”

Section: Discussionmentioning

confidence: 99%

How much is enough? Sampling intensity influences estimates of reproductive variance in an introduced population

McLennan

Belov

Hogg

et al. 2021

Ecological Applications

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Conservation introductions to islands and fenced enclosures are increasing as in situ mitigations fail to keep pace with population declines. Few studies consider the potential loss of genetic diversity and increased inbreeding if released individuals breed disproportionately. As funding is limited and post‐release monitoring expensive for conservation programs, understanding how sampling effort influences estimates of reproductive variance is useful. To investigate this relationship, we used a well‐studied population of Tasmanian devils (Sarcophilus harrisii) introduced to Maria Island, Tasmania, Australia. Pedigree reconstruction based on molecular data revealed high variance in number of offspring per breeder and high proportions of unsuccessful individuals. Computational subsampling of 20%, 40%, 60%, and 80% of observed offspring resulted in inaccurate estimates of reproductive variance compared to the pedigree reconstructed with all sampled individuals. With decreased sampling effort, the proportion of inferred unsuccessful individuals was overestimated and the variance in number of offspring per breeder was underestimated. To accurately estimate reproductive variance, we recommend sampling as many individuals as logistically possible during the early stages of population establishment. Further, we recommend careful selection of colonizing individuals as they may be disproportionately represented in subsequent generations. Within the conservation management context, our results highlight important considerations for sample collection and post‐release monitoring during population establishment.

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“…In particular cases, procedures to obtain DNA samples can also increase the fitness of animals. For example, supplementary feeding can have a direct positive impact on the fitness of birds [78], and this may occur when animals are attracted to DNA traps baited with food or feeding cages where animals are caught for DNA sampling (e.g. [79]).…”

Section: Impact Of Dna Sampling On Behaviour Fitness and Welfarementioning

confidence: 99%

Blood, sweat and tears: a review of non-invasive DNA sampling

Lefort

Cruickshank

Descovich

et al. 2018

Preprint

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The use of DNA data is ubiquitous across animal sciences. DNA may be obtained from an organism for a myriad of reasons including identification and distinction between cryptic species, sex identification, comparisons of different morphocryptic genotypes or assessments of relatedness between organisms prior to a behavioural study. DNA should be obtained while minimizing the impact on the fitness, behaviour or welfare of the subject being tested, as this can bias experimental results and cause long-lasting effects on wild animals. Furthermore, minimizing impact on experimental animals is a key Refinement principle within the ‘3Rs’ framework which aims to ensure that animal welfare during experimentation is optimised. The term ‘non-invasive DNA sampling’ has been defined to indicate collection methods that do not require capture or cause disturbance to the animal, including any effects on behaviour or fitness. In practice this is not always the case, as the term ‘non-invasive’ is commonly used in the literature to describe studies where animals are restrained or subjected to aversive procedures. We reviewed the non-invasive DNA sampling literature for the past six years (380 papers published in 2013-2018) and uncovered the existence of a significant gap between the current use of this terminology (i.e. ‘non-invasive DNA sampling’) and its original definition. We show that 58% of the reviewed papers did not comply with the original definition. We discuss the main experimental and ethical issues surrounding the potential confusion or misuse of the phrase ‘non-invasive DNA sampling’ in the current literature and provide potential solutions. In addition, we introduce the terms ‘non-disruptive’ and ‘minimally disruptive’ DNA sampling, to indicate methods that eliminate or minimise impacts not on the physical integrity/structure of the animal, but on its behaviour, fitness and welfare, which in the literature reviewed corresponds to the situation for which an accurate term is clearly missing. Furthermore, we outline when these methods are appropriate to use.

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Effect of supplementary feeding on reproductive success of hihi (stitchbird, Notiomystis cincta) at a mature forest reintroduction site

Cited by 10 publications

References 24 publications

Responses of New Zealand forest birds to management of introduced mammals

Responses of New Zealand forest birds to management of introduced mammals

How much is enough? Sampling intensity influences estimates of reproductive variance in an introduced population

Blood, sweat and tears: a review of non-invasive DNA sampling

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