ABSTRACT: Many temperate marine species cope with profound seasonal changes in temperature. One way in which these species have adapted to these conditions is by adopting life-history traits that employ seasonally dependent growth, maximising growth in the warmer summer period before experiencing a period of negligible growth and maintenance in the cooler winter period. This strategy is considered to ensure that temperate species survive the unproductive winter period. However, in the field of eco-physiology, the inability to grow in low temperature environments is considered to result from physiological limitations on growth and digestion imposed by low aerobic scope (AS) at low temperatures. In this study, we investigate the seasonal growth, bioenergetic changes and metabolic oxygen requirements (including AS) of the Australasian snapper (Sparidae: Chrysophrys auratus) over natural seasonal cycles. We demonstrate that snapper undergo marked growth over a 7 mo period spanning spring, summer and autumn, then negligible (or even negative) growth in the winter. These growth responses coincide with marked changes in physiological character, including changes in energy storage, body composition, gonadal development and haematological variation. The biological changes observed occur in combination with a broad AS curve that was relatively insensitive to the seasonal temperatures experienced in their natural range. Within this broad AS curve, variations in growth rate could not be explained by changes in AS, and vastly different rates of biological activity were observed despite only modest change in AS availability. The relevance of the oxygen capacity-limited thermal tolerance framework to the seasonal responses of snapper is discussed.

中文翻译：

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澳洲鲷鱼Chrysophrys auratus的生长和储能响应随季节而变化，有氧范围只有适度的变化

摘要：许多温带海洋物种可以应对温度的深刻季节性变化。这些物种适应这些条件的一种方式是采用采用季节性依赖生长的生活史特征，在较温暖的夏季使生长最大化，然后在较凉的冬季经历很少的生长和维持。认为该策略可确保温带物种在非生产性冬季生存下来。但是，在生态生理学领域，低温条件下无法生长的原因被认为是由于低温下低需氧范围（AS）对生长和消化造成的生理限制所致。在这项研究中，我们调查了季节性增长，ura鱼）的自然季节周期。我们证明鲷鱼在春季，夏季和秋季的7个月内经历了显着的增长，然后在冬季可以忽略不计（甚至是负增长）。这些生长反应与生理特征的明显变化相吻合，包括能量存储，身体成分，性腺发育和血液学变化的变化。观察到的生物学变化与宽广的AS曲线结合发生，该AS曲线对自然范围内经历的季节性温度相对不敏感。在这条宽广的AS曲线内，无法通过AS的变化来解释增长率的变化，尽管仅在AS可用性方面有适度的变化，但仍观察到生物学活性的差异很大。