Conservation biology: Science, sex and the kakapo

  title={Conservation biology: Science, sex and the kakapo},
  author={William J. Sutherland},
Sex-allocation theory predicts how the sex ratio of offspring should vary with the mother's physical condition. Applying this theory has helped in retrieving a charismatic parrot from the edge of extinction. 

A Study in Skew Sex Allocation Bias in Birds

  • Biology
  • 2009
K skew refers to sex allocation bias or sex ratio adjustment, which is variance of a population or its progeny from the evolutionarily stable 50:50 (male:female) sex ratio.

A model-based test of the efficacy of a simple rule for predicting adaptive sex allocation

A mathematicalcomputational model is built that finds that the simple rule is a better predictor of adaptive sex-allocation decisions when more features of an organism’s life cycle are assumed to evolve.

The Possum Pied Piper: the development and investigation of an audio lure for improved possum (Trichosurus vulpecula) monitoring and control in New Zealand

In areas where possum populations were high,audio lures were no better than traditional lures at attracting possums, with all sites becoming saturated by possum activity, suggesting audio lures may be most effective in areas with lower possum densities.

Sex ratio and relatedness in the Griffon vulture (Gyps fulvus) population of Serbia

The data suggest that, even though a relatively high level of inbreeding can be detected among the individual birds, the Griffon vulture population from Serbia can be used as a source population for restocking and reintroduction programmes in the region.

A tale of two taonga: mutualistic research and management of heritage landscapes on Codfish Island (Whenua Hou), Aotearoa New Zealand

ABSTRACT Biological and cultural heritage features regularly coexist and overlap within landscapes, creating complex management challenges. Codfish Island (Whenua Hou), Aotearoa New Zealand,

Nestling growth and body condition of critically endangered Orange-bellied Parrots Neophema chrysogaster

The body condition index provides a repeatable, rapid and cheap way to assess body condition of wild Orange-bellied Parrot nestlings, and provides a framework for developing hypotheses to test using an empirical and measurable index of individual quality.

Seeing‐good‐gene‐based mate choice: From genes to behavioural preferences

The results show that mate choice can play an important role in improving reproductive output, with an example in which an endangered bird selects mates using UV visual capability.

Colour aberrations in extinct and endangered birds

© British Ornithologists’ Club 2010 This is an open access article, available to all readers online. The attached file is the published version of the article.

Female-biased offspring sex ratios in birds at a mercury- contaminated river

This study is the first to examine the impact of mercury on offspring sex ratios in birds, and contributes to the understanding of the potential for this persistent biomagnifying contaminant to alter fitness and effective population size in wildlife.

Zoo Conservation Biology

In the face of ever-declining biodiversity, zoos have a major role to play in species conservation. Written by professionals involved in in-situ conservation and restoration projects internationally,



Saving the Kakapo: the conservation of the world's most peculiar parrot

The conservation history and current status of the Kakapo Strigops habroptilus, a large New Zealand parrot which has been reduced to only 54 individuals through predation by introduced mammals, is reviewed and threatened with extinction is described.

Extreme bias in sex allocation in Eclectusparrots

Control over sex allocation in eclectus parrots is one of the most extreme reported from birds, and Monte–Carlo simulations show that these runs of same–sex clutches defy expectation if the sex of chicks within each clutch is independent of the previous clutch.

Natural Selection of Parental Ability to Vary the Sex Ratio of Offspring

Theory and data suggest that a male in good condition at the end of the period of parental investment is expected to outreproduce a sister in similar condition, while she is expected to outreproduce

Brood sex ratios, female harem status and resources for nestling provisioning in the great reed warbler (Acrocephalus arundinaceus)

Three studies of polygynous bird species, including the authors' own, have demonstrated the same pattern of a male-biased offspring sex ratio in primary compared with secondary nests, and it is found that great reed warbler males increased their share of parental care as the proportion of sons in the brood increased.

Offspring sex ratios in tree swallows: females in better condition produce more sons

In tree swallows, investment in sons has the potential for higher fitness returns than investment in daughters, assuming that sons in better condition have greater reproductive success.

Experimental demonstration that offspring sex ratio varies with maternal condition.

Experimental evidence is provided of an adaptive, facultative adjustment of sex ratio in response to changes in maternal condition in wild birds, which is commonly tested in wild populations.