{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T06:00:34Z","timestamp":1787032834768,"version":"build-2736575974"},"reference-count":144,"publisher":"PeerJ","license":[{"start":{"date-parts":[[2023,2,3]],"date-time":"2023-02-03T00:00:00Z","timestamp":1675382400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"The New Zealand government, public donations and commercial partners"},{"name":"The European Association of Avian Veterinarians"},{"name":"The Finnish Center for Artificial Intelligence"},{"name":"The New Zealand Ministry of Business, Innovation and Employment (MBIE) Endeavour Fund","award":["UOCX1602"],"award-info":[{"award-number":["UOCX1602"]}]},{"name":"National Science Foundation\u00a0Track 2 EPSCoR Program","award":["OIA-1826801"],"award-info":[{"award-number":["OIA-1826801"]}]},{"DOI":"10.13039\/100005156","name":"Alexander von Humboldt Foundation","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100005156","id-type":"DOI","asserted-by":"crossref"}]},{"name":"University of Otago doctoral scholarship"},{"name":"Genomics Aotearoa High-Quality Genomes and Population Genomics project"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>\n                      Animal conservation often requires intensive management actions to improve reproductive output, yet any adverse effects of these may not be immediately apparent, particularly in threatened species with small populations and long lifespans. Hand-rearing is an example of a conservation management strategy which, while boosting populations, can cause long-term demographic and behavioural problems. It is used in the recovery of the critically endangered k\u0101k\u0101p\u014d (\n                      <jats:italic>Strigops habroptilus<\/jats:italic>\n                      ), a flightless parrot endemic to New Zealand, to improve the slow population growth that is due to infrequent breeding, low fertility and low hatching success.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>We applied Bayesian mixed models to examine whether hand-rearing and other factors were associated with clutch fertility in k\u0101k\u0101p\u014d. We used projection predictive variable selection to compare the relative contributions to fertility from the parents\u2019 rearing environment, their age and previous copulation experience, the parental kinship, and the number of mates and copulations for each clutch. We also explored how the incidence of repeated copulations and multiple mates varied with k\u0101k\u0101p\u014d density.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The rearing status of the clutch father and the number of mates and copulations of the clutch mother were the dominant factors in predicting fertility. Clutches were less likely to be fertile if the father was hand-reared compared to wild-reared, but there was no similar effect for mothers. Clutches produced by females copulating with different males were more likely to be fertile than those from repeated copulations with one male, which in turn had a higher probability of fertility than those from a single copulation. The likelihood of multiple copulations and mates increased with female:male adult sex ratio, perhaps as a result of mate guarding by females. Parental kinship, copulation experience and age all had negligible associations with clutch fertility.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>These results provide a rare assessment of factors affecting fertility in a wild threatened bird species, with implications for conservation management. The increased fertility due to multiple mates and copulations, combined with the evidence for mate guarding and previous results of k\u0101k\u0101p\u014d sperm morphology, suggests that an evolutionary mechanism exists to optimise fertility through sperm competition in k\u0101k\u0101p\u014d. The high frequency of clutches produced from single copulations in the contemporary population may therefore represent an unnatural state, perhaps due to too few females. This suggests that opportunity for sperm competition should be maximised by increasing population densities, optimising sex ratios, and using artificial insemination. The lower fertility of hand-reared males may result from behavioural defects due to lack of exposure to conspecifics at critical development stages, as seen in other taxa. This potential negative impact of hand-rearing must be balanced against the short-term benefits it provides.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.7717\/peerj.14675","type":"journal-article","created":{"date-parts":[[2023,2,3]],"date-time":"2023-02-03T04:40:06Z","timestamp":1675399206000},"page":"e14675","source":"Crossref","is-referenced-by-count":12,"title":["Hidden impacts of conservation management on fertility of the critically endangered k\u0101k\u0101p\u014d"],"prefix":"10.7717","volume":"11","author":[{"given":"Andrew","family":"Digby","sequence":"first","affiliation":[{"name":"K\u0101k\u0101p\u014d Recovery Programme, Department of Conservation, Invercargill, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daryl","family":"Eason","sequence":"additional","affiliation":[{"name":"K\u0101k\u0101p\u014d Recovery Programme, Department of Conservation, Invercargill, New 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University of Otago, Dunedin, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marissa F.","family":"Le Lec","sequence":"additional","affiliation":[{"name":"Genomics Aotearoa, Dunedin, New Zealand"},{"name":"Department of Biochemistry, University of Otago, Dunedin, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joseph","family":"Guhlin","sequence":"additional","affiliation":[{"name":"Genomics Aotearoa, Dunedin, New Zealand"},{"name":"Department of Biochemistry, University of Otago, Dunedin, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tammy E.","family":"Steeves","sequence":"additional","affiliation":[{"name":"School of Biological Sciences, University of Canterbury, Christchurch, New Zealand"},{"name":"Genomics Aotearoa, Christchurch, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter K.","family":"Dearden","sequence":"additional","affiliation":[{"name":"Genomics Aotearoa, Dunedin, New Zealand"},{"name":"Department of Biochemistry, University of Otago, Dunedin, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tineke","family":"Joustra","sequence":"additional","affiliation":[{"name":"Unaffiliated, Auckland, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caroline","family":"Lees","sequence":"additional","affiliation":[{"name":"IUCN SSC Conservation Planning Specialist Group, Auckland, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tane","family":"Davis","sequence":"additional","affiliation":[{"name":"Te R\u016bnanga o Ng\u0101i Tahu, Christchurch, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deidre","family":"Vercoe","sequence":"additional","affiliation":[{"name":"K\u0101k\u0101p\u014d Recovery Programme, Department of Conservation, Invercargill, New 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