Hematocrit, age, and survival in a wild vertebrate population.
Hematocrit, age, and survival in a wild vertebrate population.
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DOI：
10.1002/ece3.7015
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发表时间：
2021-01
影响因子：
2.6
通讯作者：
Richardson DS
中科院分区：
文献类型：
--
作者：
Brown TJ;Hammers M;Taylor M;Dugdale HL;Komdeur J;Richardson DS
了解野生种群的权衡是困难的，但如果我们要了解生活史的演变和生态变量对它们的影响，这一点很重要。反映生理状态和预测未来生存的标记将对破解这种权衡有相当大的好处，并可以提供对衰老过程中个体差异的洞察。然而，目前使用的标记往往会产生不一致的结果。一种未得到充分利用的指标是红细胞压积，即血液中红细胞的比例，它与血液的携氧能力和粘度以及个人耐力有关。横断面研究表明，红细胞压积随着年龄的增长而下降(这可能会被选择性的出现/消失所混淆)。然而，很少有研究测试个体内的红细胞压积是否下降，或者低红细胞压积是否会影响野生类群的存活率。利用塞舌尔林莺(Acrocephalus Sechellens)的纵向数据，我们证明了年轻个体的红细胞压积随着年龄的增加而增加(1.5岁)，而老年人的红细胞压积随着年龄的增加而减少(1.5-13岁)。在育种者中，雄性的红细胞压积高于雌性，且与繁殖阶段有关。在年轻个体中，高红细胞压积与较低的存活率有关，但与老年个体无关。因此，虽然我们没有发现支持红细胞压积作为衰老的标志，但高红细胞压积在年轻个体中表明情况不佳。可能的解释是，这些人在被捕前经历了脱水和/或高耐力要求，这需要进一步调查。我们的研究表明，红细胞压积可以作为生命史研究中的一个信息指标，用于研究生存、长寿和生殖之间的权衡。利用长期数据，我们研究了野生脊椎动物塞舌尔林莺(Acrocephalus Sechellensis)的红细胞压积、纵向年龄和生存之间的关系。红细胞压积在个体内表现出一种独特的年龄依赖性模式，红细胞压积高的年轻个体的生存前景较差。这项研究强调了一种新的随着年龄增长的生理变化，它表明了野生种群中的个体状况。
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 (Acrocephalus sechellensis), we demonstrated that hematocrit increases with age in young individuals (<1.5 years) but decreases with age in older individuals (1.5–13 years). In breeders, hematocrit was higher in males than females and varied relative to breeding stage. High hematocrit was associated with lower survival in young individuals, but not older individuals. Thus, while we did not find support for hematocrit as a marker of senescence, high hematocrit is indicative of poor condition in younger individuals. Possible explanations are that these individuals were experiencing dehydration and/or high endurance demands prior to capture, which warrants further investigation. Our study demonstrates that hematocrit can be an informative metric for life‐history studies investigating trade‐offs between survival, longevity, and reproduction. Using long‐term data we investigated the association between haematocrit, longitudinal age and survival in a wild vertebrate population—the Seychelles warbler (Acrocephalus sechellensis). Haematocrit exhibited a distinctive age‐dependent pattern within‐individuals, and young individuals with high haematocrit had poorer survival prospects. This study highlights a novel physiological change with age that is indicative of individual condition in wild populations.
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DOI：
10.3324/haematol.2009.008417
发表时间：
2010-02-01
期刊：
HAEMATOLOGICA-THE HEMATOLOGY JOURNAL
影响因子：
--
作者：
Braekkan, Sigrid K.;Mathiesen, Ellisiv B.;Hansen, John-Bjarne
通讯作者：
Hansen, John-Bjarne
影响因子：
5.2
作者：
Cornell, Allison;Gibson, Kate F.;Williams, Tony D.
通讯作者：
Williams, Tony D.
影响因子：
0.8
作者：
Davey, C;Lill, A;Baldwin, J
通讯作者：
Baldwin, J
影响因子：
4.1
作者：
Gaskell, Helen;Derry, Sheena;McQuay, Henry J
通讯作者：
McQuay, Henry J
影响因子：
4.8
作者：
Brouwer, Lyanne;Richardson, David S.;Komdeur, Jan
通讯作者：
Komdeur, Jan