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Physiological basis of extreme growth rate differences in the spat of oyster (Crassostrea gigas)

机译：牡蛎（Crassostrea gigas）上的极端生长速率差异的生理基础

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Juvenile oysters (Crassostrea gigas) (produced in November 2009) reared under uniform hatchery conditions for 4 months were selected for extreme growth rate differences by repeatedly taking larger and smaller individuals to achieve weight differences ＞30× between fast (F) and slow (S) growers. The physiological basis of differential growth was analyzed in experiments in June 2010, where components of energy gain (clearance and ingestion rates and absorption efficiency), energy loss (metabolic rates) and resulting scope for growth (J h~(-1)) were compared for groups of F and S oysters fed three different ration levels (≈0.5, 1.5 and 3.0 mg of total particulate matter L~(-1)). In both F and S oysters, a higher food ration promoted asymptotic increases in energy gain rates through regulatory adjustments to clearance rates, which maintained similar absorption efficiencies across the food concentrations. No significant differences were found between growth groups in mass-specific physiological rates (i.e., per unit of body mass). However, the scaling of these rates to a common size in both groups using allometric coefficients derived for C. gigas revealed higher energy gain rates coupled with lower metabolic costs of growth in fast growers. Thus, appropriate size-standardization is essential in accounting for observed differences in growth rate. Present results are in accordance with previous reports on other bivalve species on the physiological processes underlying endogenous growth differences, suggesting that the same interpretation can be applied to the extremes of these differences.
机译：选择牡蛎（Crassostrea gigas）（2009年11月生产）在均匀孵化场饲养4个月，以通过极端地选择大个体和小个体以达到快速（F）和慢速（S）体重差异> 30倍来选择极端生长率。 ）种植者。在2010年6月的实验中分析了差异生长的生理基础，其中能量获得（清除率，摄入速率和吸收效率），能量损失（代谢速率）和产生的生长范围（J h〜（-1））的成分为比较了喂食三种不同日粮水平（约0.5、1.5和3.0 mg总颗粒物L〜（-1））的F和S组牡蛎。在F型和S型牡蛎中，较高的食物定量可通过对清除率的调节来促进能量获取率的渐进增加，从而在整个食物浓度下保持相似的吸收效率。生长组之间在质量特异性生理速率（即每单位体重）上没有发现显着差异。但是，使用从长臂梭菌推导的异速系数将这两个比例的比例缩放到共同的大小，揭示了较高的能量获取速率以及较低的速生植物生长代谢成本。因此，适当的尺寸标准化对于解决观察到的增长率差异至关重要。目前的结果与先前关于其他双壳类物种有关内源性生长差异的生理过程的报道一致，表明相同的解释可以应用于这些差异的极端。

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  • 来源
    《Marine biology》 |2014年第7期|1627-1637|共11页
  • 作者

    David Tamayo; Irrintzi Ibarrola; Inaki Urrutxurtu; Enrique Navarro;

  • 作者单位

    Departamento GAFFA (Animal Physiology), Facultad de Ciencia y Tecnologfa, Universidad del Pais Vasco/Euskal Herriko Unibertsitatea, Apartado 644, 48080 Bilbao, Spain,Unite de Recherche Physiologie Fonctionnelle des Organismes Marins, Laboratoire des Sciences de I'Environnement Marin(UMR 65 39 LEMAR), Ifremer, ZI de la Pointe du Diable, CS 10070, 29280 Plouzane France;

    Departamento GAFFA (Animal Physiology), Facultad de Ciencia y Tecnologfa, Universidad del Pais Vasco/Euskal Herriko Unibertsitatea, Apartado 644, 48080 Bilbao, Spain;

    Departamento GAFFA (Animal Physiology), Facultad de Ciencia y Tecnologfa, Universidad del Pais Vasco/Euskal Herriko Unibertsitatea, Apartado 644, 48080 Bilbao, Spain;

    Departamento GAFFA (Animal Physiology), Facultad de Ciencia y Tecnologfa, Universidad del Pais Vasco/Euskal Herriko Unibertsitatea, Apartado 644, 48080 Bilbao, Spain;

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