Thermal, trophic and metabolic life histories of inaccessible fishes revealed from stable-isotope analyses: a case study using orange roughy Hoplostethus atlanticus.

Thermal, trophic and metabolic life histories of inaccessible fishes revealed from stable-isotope analyses: a case study using orange roughy Hoplostethus atlanticus.
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稳定同位素分析揭示了难以接近的鱼类的热、营养和代谢生活史:以橙粗罗鱼大西洋鱼为案例研究。

DOI:
10.1111/jfb.12267
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发表时间:
2013
影响因子:
2
通讯作者:
Trueman CN
Trueman CN
中科院分区:
农林科学3区
文献类型:
--
作者:
Trueman CN

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通过对耳石和肌肉组织的稳定同位素分析,获得了橙子胸棘鲷(Hoplostethus atlanticus)栖息水深、代谢率和营养行为的时间分辨记录。结果表明,H.来自大西洋东北部的大西洋有着复杂的生活史,有三个不同的深度分层生活阶段。幼年早期。Atlantis栖息地相对较浅,幼鱼H.大西洋显示出一个深底阶段,在性成熟和成年时上升。随着年龄的增长,大西洋鱼利用的栖息地越来越深。在所有采样尺寸下,H.大西洋的肌肉组织具有同位素组成,表明其食物是底栖的,而不是底栖或远洋的。相对代谢率的同位素测量提供了对个体发育过程中能量分配的深入了解。与共存的深水底栖鱼类相比,大西洋胸棘鲷的代谢率相对较低,这与它们异常高的寿命相一致。令人惊讶的是,一生中最快的增长率是在幼年阶段实现的,此时耳石同位素意味着深水居住和相对较低的代谢率。快速增长可能会持续在一个时期的高效率与降低代谢成本的猎物捕获或捕食者逃避。稳定同位素方法可以应用于任何硬骨鱼,并为研究深水鱼类群落提供了一种快速,具有成本效益的技术。
A time‐resolved record of inhabited water depth, metabolic rate and trophic behaviour of the orange roughyHoplostethus atlanticuswas recovered from combined stable‐isotope analyses of otolith and muscle tissue. The results demonstrate thatH. atlanticusfrom the north‐east Atlantic Ocean have a complex life history with three distinct depth‐stratified life stages. Early juvenileH. atlanticusoccupy relatively shallow habitats, juvenileH. atlanticusshow a deep‐demersal phase, rising at sexual maturity, and adultH. atlanticusexploit increasingly deep habitats with increasing age. At all sampled sizes,H. atlanticusmuscle tissues have an isotopic composition suggesting a benthic rather than benthopelagic or pelagic diet. Isotopic measures of relative metabolic rate provide an insight into energy partitioning throughout ontogeny.Hoplostethus atlanticushave relatively low metabolic rates compared to coexisting deep‐water benthic fishes, consistent with their unusually high longevity. Surprisingly, lifetime fastest growth rates are achieved during juvenile stages when otolith isotopes imply deep‐water residency and relatively low metabolic rates. Fast growth may be sustained during a period of high efficiency associated with reduced metabolic costs of prey capture or predator evasion. The stable‐isotope approach can be applied to any teleost and provides a rapid, cost‐effective technique for studying deep‐water fish communities.
深海底栖、底栖和海山相关鱼类的能量和生活史模式
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