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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Effects of a patchy food environment across life history stages
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Effects of a patchy food environment across life history stages

机译：整个生活史阶段中零散的食物环境的影响

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Many animals experience periods of feast or famine, which can have major consequences for growth, survival, and reproductive fitness. For animals with complex life histories, the question remains whether a major ontogenetic transition, such as metamorphosis, removes the legacy of early diet variability, or if early stressors persist into later stages. This study examined the effect of constant versus variable food availability and average food concentration during the larval stage on the performance of the marine gastropod Crepidula fornicata (L) before and after metamorphosis. There was no detectable effect of variable food availability on larval growth, energy stores, survival, and metamorphic competence, or juvenile growth rate and survival. Instead, the average amount of food available during the larval period had the greatest impact on larval size and metamorphic competence. Surprisingly, there were no impacts of larval diet on growth or survival during the juvenile stage. Differences that originated during the larval stage were removed post-metamorphosis. These results suggest that some organisms may be resilient to variations in food availability and that not all early life experiences produce legacy effects. Heterogeneous environments, including variable food availability, should favor flexibility in the timing of ontogenetic transitions that allow individuals to be robust in later life stages. (C) 2015 Elsevier B.V. All rights reserved.
机译：许多动物都会经历盛宴或饥荒，这可能会对生长，生存和生殖健康产生重大影响。对于具有复杂生活史的动物，问题仍然在于，主要的遗传转变（例如变态反应）是否消除了早期饮食可变性的遗留，还是早期压力源持续到了后期。这项研究检查了幼体阶段恒定和可变的食物供应量和平均食物浓度对变态前后海腹腹足纲Crepidula fornicata（L）性能的影响。没有可变的食物供应量对幼虫的生长，能量存储，存活和变态能力或幼年的生长率和存活率没有可检测的影响。取而代之的是，在幼体时期可获得的平均食物量对幼体的大小和变态能力具有最大的影响。出人意料的是，幼虫期饮食对幼年期的生长或存活没有影响。幼虫阶段起源的差异在变态后被消除。这些结果表明，某些生物体可以抵抗食物供应的变化，而且并非所有早期生活经历都会产生遗留效应。异质环境（包括可变的食物供应量）应有利于个体发育过渡时机的灵活性，使个体在以后的生活中变得更加健壮。 （C）2015 Elsevier B.V.保留所有权利。

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