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首页> 外文期刊>Journal of Fish Biology >Liver size reveals social status in the African cichlid Neolamprologus pulcher
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Liver size reveals social status in the African cichlid Neolamprologus pulcher

机译：肝脏大小揭示了非洲慈鲷Neolamprologus pulcher中的社会地位

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Wild groups (n = 167) of the cooperatively breeding Lake Tanganyika cichlid, Neolamprologus pulcher, were used to investigate how social status and sex influence liver investment. In contrast to expectations, males and females (controlling for body size) had similar liver investment and subordinates (both sexes) had relatively larger livers compared with dominants. Three hypotheses were considered for why social status results in liver size disparity: liver mass might reflect status-dependent differences in (1) energy expenditure, (2) energy storage and (3) energy acquisition. First, dominants performed more energetically costly behaviours (e.g. social policing and care) compared with subordinates, supporting the notion that energy expenditure drives liver investment. Moreover, dominants in large groups (with many subordinates to monitor) and those holding multiple territories (with large areas to patrol), tended to have smaller livers. Second, subordinates did not appear to use the liver as a strategic energy storage organ. In laboratory and field experiments, subordinates ascending in rank had similar or larger livers during periods of rapid growth compared with non-ascending controls. Third, although subordinates fed more frequently than dominants, a negative relationship was found between feeding rates and liver size. Hence, these results contrast with previous liver studies and suggest that liver investment patterns were linked to status-driven differences in energy expenditure but not to energy intake or storage in N. pulcher.
机译：合作繁殖的坦any尼喀丽鱼湖丽鱼科的新野生种群（n = 167）被用来调查社会地位和性别如何影响肝脏投资。与预期相反，男性和女性（控制体型）的肝脏投资相近，而下属（男女）的肝脏相对于优势人群相对较大。考虑了三个假设，说明社会地位为何会导致肝脏大小差异：肝脏质量可能反映了（1）能量消耗，（2）能量存储和（3）能量获取中与状态有关的差异。首先，与下属相比，统治者的行为更加耗能（例如社会治安和社会照顾），从而支持了能源支出驱动肝脏投资的观点。此外，大型团体（有许多下属需要监视）和拥有多个地区（大型巡逻地区）的统治者的肝脏往往较小。其次，下属似乎没有利用肝脏作为战略性的能量储存器官。在实验室和野外实验中，与非升序对照组相比，在快速成长时期，升序级下属的肝脏相似或更大。第三，尽管下属的进食频率比主要人高，但进食速度与肝脏大小之间却存在负相关关系。因此，这些结果与先前的肝脏研究形成对照，并表明肝脏投资模式与能量消耗的状态驱动差异有关，但与猪笼草的能量摄入或储存无关。

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