ArticleEcology and evolution2021
Hematocrit, age, and survival in a wild vertebrate population.
Article in Ecology and evolution, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
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.
The trial behind it
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.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
12 citing papers in PubMed, 25 citations in OpenAlex.
- Asynchrony of ageing among traits in a wild bird population.Evolution letters · 2026Article
- Review
- Toxicological Activities ofBiology · 2026Article
- Adjusting to urban stress: How Eurasian tree sparrows modulate multiple physiological and nutritional markers across sexes.Current zoology · 2025Article
- Mate-switching is not associated with offspring fitness in a socially monogamous bird.Proceedings. Biological sciences · 2025Article
- Sodium and Hematocrit Levels' Correlation and Clinical Impacts in Jordanian Hemodialysis Patients.Cureus · 2024Article
- Physiological impacts of chronic and experimental Plasmodium infection on breeding-condition male songbirds.Scientific reports · 2023Article
- Experimentally manipulated food availability affects offspring quality but not quantity in zebra finch meso-populations.Oecologia · 2022Article
- Flexible growth and body mass predict physiological condition at fledging in the synchronously breeding European starling,Royal Society open science · 2022Article
- Gut microbiome composition, not alpha diversity, is associated with survival in a natural vertebrate population.Animal microbiome · 2021Article
- Hematocrit, age, and survival in a wild vertebrate population.Ecology and evolution · 2021Article
- Effects of experimental nest treatment with herbs on ectoparasites and body condition of nestlings.Behavioral ecology : official journal of the International Society for Behavioral EcologyArticle
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors at 3 institutions in 3 countries.
Funding
Abstract
Understanding trade-offs in wild populations is difficult, but important if we are to understand the evolution of life histories and the impact of ecological variables upon them. Markers that reflect physiological state and predict future survival would be of considerable benefit to unraveling such trade-offs and could provide insight into individual variation in senescence. However, currently used markers often yield inconsistent results. One underutilized measure is hematocrit, the proportion of blood comprising erythrocytes, which relates to the blood's oxygen-carrying capacity and viscosity, and to individual endurance. Hematocrit has been shown to decline with age in cross-sectional studies (which may be confounded by selective appearance/disappearance). However, few studies have tested whether hematocrit declines within individuals or whether low hematocrit impacts survival in wild taxa. Using longitudinal data from the Seychelles warbler (
Indexed as
Identifiers
What OpenQuestion holds
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.