ArticleBiology letters2012
Causes of hatching failure in endangered birds.
Article in Biology letters, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
13 citing papers in PubMed, 52 citations in OpenAlex.
- It is hard to be small: Inbreeding depression on male breeding success depends on body size in a threatened songbird.Heredity · 2026Article
- Life history and ecology shape global patterns in avian hatching failure rates.BMC ecology and evolution · 2026Article
- Temporal Loss of Genome-Wide and Immunogenetic Diversity in a Near-Extinct Parrot.Molecular ecology · 2025Article
- Demographic drivers of reproductive failure in a threatened bird: Insights from a decade of data.Proceedings of the National Academy of Sciences of the United States of America · 2024Article
- Hidden impacts of conservation management on fertility of the critically endangered kākāpō.PeerJ · 2023Article
- Nature calls: intelligence and natural foraging style predict poor welfare in captive parrots.Proceedings. Biological sciences · 2021Article
- Physiological factors influencing female fertility in birds.Royal Society open science · 2021Review
- Unhatched eggs represent the invisible fraction in two wild bird populations.Biology letters · 2020Article
- Nutritional geometry of paternal effects on embryo mortality.Proceedings. Biological sciences · 2017Article
- Oxidative stress, activity behaviour and body mass in captive parrots.Conservation physiology · 2015Article
- Detection of oocyte perivitelline membrane-bound sperm: a tool for avian collection management.Conservation physiology · 2015Article
- Sexually selected dichromatism in the hihi Notiomystis cincta: multiple colours for multiple receivers.Journal of evolutionary biology · 2014Article
- Article
Corrections and comments
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Authors and funding
3 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
About 10 per cent of birds' eggs fail to hatch, but the incidence of failure can be much higher in endangered species. Most studies fail to distinguish between infertility (due to a lack of sperm) and embryo mortality as the cause of hatching failure, yet doing so is crucial in order to understand the underlying problem. Using newly validated techniques to visualize sperm and embryonic tissue, we assessed the fertility status of unhatched eggs of five endangered species, including both wild and captive birds. All eggs were classified as 'infertile' when collected, but most were actually fertile with numerous sperm on the ovum. Eggs of captive birds had fewer sperm and were more likely to be infertile than those of wild birds. Our findings raise important questions regarding the management of captive breeding programmes.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.