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Habitat utilization patterns determine the physiological condition of Cynoscion regalis during estuarine residency

机译：栖息地利用方式决定河口居留期间Cy蟹的生理状况

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摘要

For many species, quantifying nursery function of estuarine habitats, including tidal salt marshes, for early life stages is complicated by multiple habitat shifts over their period of estuarine residency. Our study relates the physiological condition of young of the year (YOY) of a marine transient species (weakfish Cynoscion regalis) to the quality of habitats frequented during their period of estuarine residency by examining their physiological condition (energetic reserves in the form of triacylglycerol, normalized to the expected changes with length) as a function of habitat use patterns and corresponding stable isotope signatures. In addition, for C. regalis preparing to emigrate offshore to wintering grounds, we evaluated the benefit of energetic reserves towards mitigating over-winter starvation in the context of individual metabolic rate. We found significant spatial distribution in the physiological condition of YOY C. regalis over their period of estuarine residency, with those utilizing polyhaline salt marshes consistently having comparable or higher condition across all years of the study. For C. regalis preparing to emigrate to offshore, we found inter-annual variability both in the relative utilization of marsh versus open bay regions and in their associated energetic reserves. However, variability in reserves was not reflected in the potential benefit of reserves in mitigating over-winter starvation, suggesting plasticity in energy allocation for YOY C. regalis. These results demonstrate that both the habitats utilized over the period of estuarine residency and larger-scale inter-annual variability can affect the condition and preparedness of YOY marine transients for the rigors of migration and over-wintering.
机译：对于许多物种来说，在生命的早期阶段，量化河口栖息地（包括潮汐盐沼）的育苗功能会因其在河口居住期间的多次生境变化而变得复杂。我们的研究通过检查海洋生理暂态物种（三酰基甘油形式的高能储备），海洋暂态物种（弱势犬Cynoscion regalis）的年幼（YOY）生理状况与其在河口居住期间经常出入的栖息地的质量相关。归一化为预期的长度变化），取决于栖息地使用方式和相应的稳定同位素特征。此外，对于准备在海上迁移到越冬地的帝王梭菌，我们评估了高能量储藏在个体新陈代谢率的背景下对缓解冬季饥饿的益处。我们发现YOY C. regalis在河口居住期间的生理状况具有显着的空间分布，在整个研究期间，利用多卤盐沼的沼泽地的状况一直处于可比或更高的水平。对于准备迁移到近海的帝王梭菌，我们发现沼泽与开阔海湾地区的相对利用及其相关的能量储量都存在年际变化。但是，储量的可变性并未反映在储量在减轻冬季饥饿方面的潜在好处中，这表明YOY C. regalis的能源分配具有可塑性。这些结果表明，在河口居住期间利用的栖息地和较大的年际变化都可能影响YOY海洋瞬变的条件和准备，以应对严峻的迁徙和越冬。

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