Starvation rates in larval and juvenile Atlantic silversides (Menidia menidia) are unaffected by high CO2 conditions
Starvation rates in larval and juvenile Atlantic silversides (Menidia menidia) are unaffected by high CO2 conditions
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大西洋银鳅 (Menidia menidia) 幼虫和幼鱼的饥饿率不受高二氧化碳条件的影响
DOI：
10.1007/s00227-018-3335-x
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发表时间：
2018
期刊：
影响因子：
2.4
通讯作者：
Murray, Christopher S.
中科院分区：
文献类型：
--
作者：
Baumann, Hannes;Parks, Elle M.;Murray, Christopher S.
在过去的十年里，对鱼类早期生命阶段的实验室实验发现，许多特征对二氧化碳水平升高明显敏感。关于幼虫的生长，高CO2环境通常被认为会增加酸碱调节和其他塑料反应，从而产生额外的代谢成本，减少生长的范围。这一假设没有得到经验证据的充分支持。其中一个原因可能是实验通常提供不受限制的喂养条件，这可能使幼虫通过增加食物摄入来补偿更高的成本。为了消除潜在的混淆影响的幼虫喂养，我们进行了一系列的饥饿试验的后代大西洋银汉鱼（Menidia menidia），预测更快的饥饿在高环境CO2处理相比。我们收集了五个独立实验的观察结果，这些实验跨越了不同的年份、实验室、温度（17-26 °C）、生命阶段（新孵化的幼虫、先前喂养的幼虫、早期幼虫）和二氧化碳水平（300-6500 µatm）。与预期相反，我们发现，饥饿率在很大程度上是独立的CO2环境中，这种鱼类。一个例外发生在最低的温度和最极端的CO2处理，这导致在高比环境CO2处理的新孵化的幼虫的饥饿速度较慢，而不是更快。饥饿率作为CO2对幼鱼代谢影响的代理的明显失败可能有几个原因，包括后代的潜在CO2耐受性，观察到的早期生命存活的大随机性掩盖了高CO2的小代谢成本，以及食物剥夺引起的鱼代谢的普遍抑制和重构。
Over the past decade, laboratory experiments on fish early life stages have found many traits that are evidently sensitive to elevated CO2levels. With respect to larval growth, high CO2environments are commonly assumed to increase acid–base regulation and other plastic responses, thus incurring additional metabolic costs that reduce the scope for growth. This assumption is not well supported by empirical evidence. One reason might be that experiments often provide unrestricted feeding conditions, which could allow larvae to compensate for higher costs by increased food intake. To remove potentially confounding effects of larval feeding, we conducted a series of starvation trials on offspring of the Atlantic silverside (Menidia menidia), predicting faster starvation at high compared to ambient CO2treatments. We compiled observations from five separate experiments spanning different years, laboratories, temperatures (17–26 °C), life stages (newly hatched larvae, previously fed larvae, early juveniles), and CO2levels (300–6500 µatm). Contrary to expectation, we found that starvation rates were largely independent of the CO2environment in this fish species. The one exception occurred at the lowest temperature and most extreme CO2treatment, which resulted in slower not faster starvation in newly hatched larvae at high compared to ambient CO2treatments. The apparent failure of starvation rate as a proxy for CO2effects on larval fish metabolism may have several reasons, including potential CO2tolerance of offspring, observed large stochasticity in early life survival masking small metabolic costs of high CO2, and the general depression and reconfiguration of fish metabolism in response to food deprivation.
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