A multi-tasking stomach: functional coexistence of acid–peptic digestion and defensive body inflation in three distantly related vertebrate lineages
A multi-tasking stomach: functional coexistence of acid–peptic digestion and defensive body inflation in three distantly related vertebrate lineages
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多任务胃：三个远亲脊椎动物谱系中酸消化和防御性身体膨胀的功能共存
DOI：
10.1098/rsbl.2021.0583
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发表时间：
2022
期刊：
影响因子：
3.3
通讯作者：
Wilson, J. M.
中科院分区：
文献类型：
--
作者：
Ferreira, P.;Kwan, G. T.;Haldorson, S.;Rummer, J. L.;Tashiro, F.;Castro, L. F.;Tresguerres, M.;Wilson, J. M.
河豚鱼和豪猪鱼（犬牙鱼科和四齿鱼科，四形目）以其非凡的能力而闻名，它们通过吞咽并在它们的胃中保留大量的海水，使身体大小增加了两倍。这种通货膨胀机制为掠夺提供了防御；然而，它与胃消化功能的继发性丧失有关。在膨胀期间摄入碱性海水会使酸化效率低下（胃消化功能丧失的潜在驱动因素），与此同时，酸性消化基因也会丧失。我们通过研究四种远亲胃膨胀颌口动物的胃表型和基因型，验证了胃膨胀作为胃丧失趋同进化驱动因素的假设：马尾藻鱼、膨胀鲨、胡须虾虎鱼和侏儒皮衣鱼。引人注目的是，与河豚/豪猪鱼不同的是，我们没有发现马尾藻鱼、膨胀鲨和胡子虾虎鱼胃功能丧失的证据。只有侏儒皮夹克（单棘目，四齿兽目）缺乏胃表型和基因型。综上所述，摄入海水充气式，与胃酸分泌减少有关，仅限于四齿形鱼类，而不是其他报道的胃充气式鱼类的胃损失的选择性压力。
Puffer and porcupine fishes (families Diodontidae and Tetraodontidae, order Tetradontiformes) are known for their extraordinary ability to triple their body size by swallowing and retaining large amounts of seawater in their accommodating stomachs. This inflation mechanism provides a defence to predation; however, it is associated with the secondary loss of the stomach's digestive function. Ingestion of alkaline seawater during inflation would make acidification inefficient (a potential driver for the loss of gastric digestion), paralleled by the loss of acid–peptic genes. We tested the hypothesis of stomach inflation as a driver for the convergent evolution of stomach loss by investigating the gastric phenotype and genotype of four distantly related stomach inflating gnathostomes: sargassum fish, swellshark, bearded goby and the pygmy leatherjacket. Strikingly, unlike in the puffer/porcupine fishes, we found no evidence for the loss of stomach function in sargassum fish, swellshark and bearded goby. Only the pygmy leatherjacket (Monochanthidae, Tetraodontiformes) lacked the gastric phenotype and genotype. In conclusion, ingestion of seawater for inflation, associated with loss of gastric acid secretion, is restricted to the Tetraodontiformes and is not a selective pressure for gastric loss in other reported gastric inflating fishes.
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影响因子：
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DOI：
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