Seasonal and habitat-related changes in population density of North Island Saddlebacks (<i>Philesturnus rufusater</i>) on a small island: using distance sampling to determine variation

Brunton, Dianne H.; Stamp, Rosalie K.

doi:10.1071/mu06051

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…1) carry all of the song diversity present in source populations [c. 400-1000 birds, see Fig. 1 and (Hooson & Jamieson 2003;Brunton & Stamp 2007)]. This results in a gradual decrease in song sharing, and decreased variation in the acoustic characteristics of songs, when moving from the ancestral population through the serially translocated populations.…”

Section: Discussionmentioning

confidence: 99%

The effects of translocation‐induced isolation and fragmentation on the cultural evolution of bird song

Parker

Anderson

Jenkins³

et al. 2012

Ecology Letters

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Understanding the divergence of behavioural signals in isolated populations is critical to knowing how certain barriers to gene flow can develop. For many bird species, songs are essential for conspecific recognition and mate choice. Measuring the rate of song divergence in natural populations is difficult, but translocations of endangered birds to isolated islands for conservation purposes can yield insights, as the age and source of founder populations are completely known. We found significant and rapid evolution in the structure and diversity of bird song in North Island saddlebacks, Philesturnus rufusater, in New Zealand, with two distinct lineages evolving in < 50 years. The strong environmental filters of serial translocations resulted in cultural bottlenecks that generated drift and reduced song variability within islands. This rapid divergence coupled with loss of song diversity has important implications for the behavioural evolution of this species, demonstrating previously unrecognised biological consequences of conservation management.

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Section: Discussionmentioning

confidence: 99%

The effects of translocation‐induced isolation and fragmentation on the cultural evolution of bird song

Parker

Anderson

Jenkins³

et al. 2012

Ecology Letters

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“…The greatest density observed in BP in the 3 years of monitoring was 0.71 adults/ha, a level well below the greatest densities estimated on Mokoia (1.61 adults/ha; Armstrong et al ) and Tiri (approx. 2 adults/ha; Brunton and Stamp ). Consequently, our models for BP using non‐informative priors produced unrealistic density coefficient estimates with large uncertainty.…”

Section: Discussionmentioning

confidence: 99%

Using prior data to improve models for reintroduced populations: A case study with North Island Saddlebacks

Gedir

Thorne

Brider³

et al. 2013

Jour. Wild. Mgmt.

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Monitoring of reintroductions is essential, but often requires significant resources. If data are available from previous reintroductions, they can be used as priors in a Bayesian framework, potentially reducing the amount of data needed from a new reintroduced population before reasonable projections can be made. We applied this approach to the reintroduction of North Island saddlebacks (Philesturnus rufusater) to Bushy Park, New Zealand, an 87‐ha forest reserve within a fenced exclosure where exotic mammalian predators had been eradicated. We released 34 birds in June 2006, and conducted intensive monitoring of survival and fecundity until January 2010. We modeled the data in an integrated framework whereby we generated population projections concurrent with estimations of survival and fecundity parameters, meaning estimation of uncertainty was propagated into the projections. We compared projections from 1, 2, and 3 years of monitoring data, using either non‐informative priors (i.e., inferences from Bushy Park only) or informative priors generated from 2 previous saddleback reintroductions where 5–8 years of data had been collected. The Bushy Park saddleback population grew rapidly over the monitoring period (approx. 80% per annum), and projections from 3 years of data with non‐informative priors gave a median equilibrium breeding population of 255 with a 95% prediction interval of 122–1,238. Projections from 2 years of data gave a lesser mean equilibrium population of 93 (50–360). Projections from 1 year of data revealed uncertainty about the success of the reintroduction at this stage (8.4% of simulated populations declined), and equilibrium population size could not be projected without the density effect. Using informative priors eliminated the uncertainty about whether the population would grow, allowed equilibrium population size to be projected from 1 year of Bushy Park data, and made the projections from 2 years of data more consistent with those from the full 3‐year dataset. We discuss the implications of monitoring requirements on decision making. © 2013 The Wildlife Society.

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Estimating bird densities in montane deserts: A methodological comparison in South Sinai, Egypt

Kadry

Arcilla

Goded³

et al. 2021

Journal of Arid Environments

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Seasonal and habitat-related changes in population density of North Island Saddlebacks (Philesturnus rufusater) on a small island: using distance sampling to determine variation

Cited by 4 publications

References 21 publications

The effects of translocation‐induced isolation and fragmentation on the cultural evolution of bird song

The effects of translocation‐induced isolation and fragmentation on the cultural evolution of bird song

Using prior data to improve models for reintroduced populations: A case study with North Island Saddlebacks

Estimating bird densities in montane deserts: A methodological comparison in South Sinai, Egypt

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