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首页> 外文期刊>Biological Journal of the Linnean Society >Ontogenetic shifts in resource allocation: colour change and allometric growth of defensive and reproductive structures in the Caribbean spiny lobster Panulirus argus
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Ontogenetic shifts in resource allocation: colour change and allometric growth of defensive and reproductive structures in the Caribbean spiny lobster Panulirus argus

机译：资源分配的个体遗传学变化：加勒比刺龙虾Panulirus argus的颜色变化以及防御和生殖结构的异速生长

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摘要

Resource allocation theory predicts a disproportionately large allocation of resources to defensive structures during early ontogeny in organisms that are subject to more intense predation at smaller than at larger body sizes. We tested this prediction on the Caribbean spiny lobster Panulirus argus, which exhibits a negative relationship between predation risk and body size with a high natural mortality of smaller individuals. Independent allometric growth analyses demonstrated that numerous defensive structures (e.g. orbital horns, segments supporting the antenna, the tail fan) display negative allometric growth throughout ontogeny. We interpret these findings as lobsters investing disproportionately more resources to defensive structures when small to improve survivorship. Similarly, we observed an ontogenetic shift in lobster colour pattern; small individuals (<23mm carapace length) that inhabit nursery grounds (preferably among red algae) displayed a disruptive pattern (camouflage), whereas larger juveniles displayed a bicolour pigmentation typical of adult lobsters. This shift in colour pattern further suggests that small lobsters employ cryptic coloration throughout their asocial algal stage. However, this cryptic coloration offers no advantage when lobsters grow larger and start dwelling in crevices. Other structures linked to reproduction (e.g. female pleopods and male pereopods) experienced either isometric or positive allometric growth throughout ontogeny. Our results support one of the main predictions of resource allocation theory and demonstrate ontogenetic shifts in defensive structures and coloration concomitantly with changes in lobster mortality risk mediated by size-dependent predation risk. (c) 2012 The Linnean Society of London, Biological Journal of the Linnean Society, 2012, , .
机译：资源分配理论预测，在个体发育较早的个体中，防御性结构的资源分配比例过大，而这些个体在较小的身体上比在较大的身体上受到更强的捕食。我们在加勒比刺龙虾Panulirus argus上测试了这一预测，该预测显示出捕食风险与体型之间呈负相关，而较小个体的自然死亡率较高。独立的异速生长分析表明，许多防御性结构（例如轨道角，支撑天线的部分，尾扇）在整个个体发育过程中均显示出负的异速生长。我们将这些发现解释为龙虾，它们规模较小以提高生存能力时，将过多的资源投入到防御结构中。同样，我们观察到龙虾颜色模式的个体发生变化。居住在苗圃场（最好在红藻中）的小个体（甲壳长度小于23毫米）显示出破坏性图案（伪装），而较大的少年显示出典型的成年龙虾双色色素沉着。颜色图案的这种变化进一步表明，小龙虾在整个社交海藻阶段都采用隐秘的着色。但是，当龙虾长大并开始留在缝隙中时，这种隐秘的着色没有任何优势。与生殖有关的其他结构（例如雌性腹足类和雄性脚足类）在整个个体发育过程中经历了等轴测或正等轴测生长。我们的研究结果支持了资源分配理论的主要预测之一，并证明了防御性结构和着色的个体发生变化，以及由大小相关的捕食风险介导的龙虾死亡率风险的变化。 （c）2012年伦敦林奈学会，《林奈学会生物学杂志》，2012年，，。

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