Swimming and defence: competing needs across ontogeny in armoured fishes (Agonidae)
Swimming and defence: competing needs across ontogeny in armoured fishes (Agonidae)
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DOI：
10.1098/rsif.2020.0301
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发表时间：
2020-08-26
影响因子：
3.9
通讯作者：
Donatelli, C. M.
中科院分区：
文献类型：
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作者：
Kolmann, M. A.;Peixoto, T.;Donatelli, C. M.
生物盔甲是理解对保护性外骨骼的复杂竞争需求的有效模型系统；毕竟，盔甲生物是在最恶劣的条件下经过数百万年精细工程的产物。鱼类对盔甲并不陌生，在400-500迈的进化过程中，有颌和无颌鱼类都有各种类型的盔甲。在这里，我们关注的是偷猎者（Agonidae），这是一种原产于太平洋沿岸温带水域的装甲鱼类。我们研究了北方矛鼻偷猎者（Agonopsis vulsa）的盔甲形态、身体刚度和游泳性能。幼年时期，这些鱼经常在夜间潜入水中寻找食物，而全副武装的成年鱼则与底栖动物联系在一起。大多数盔甲的尺寸和密度随着身体的长度而增加，身体的硬度也是如此。幼年偷猎者的盔甲上有更大的刺，而成年偷猎者则在甲板底部投入更多的矿物。成年鱼比幼鱼更硬，速度更快，具有鳗状游泳模式。在游泳和盔甲方面，亚成虫比体型较小的幼虫更接近成虫。偷猎者盔甲在个体发育过程中具有多种功能，从促进运动，减缓下沉和提供防御。
Biological armours are potent model systems for understanding the complex series of competing demands on protective exoskeletons; after all, armoured organisms are the product of millions of years of refined engineering under the harshest conditions. Fishes are no strangers to armour, with various types of armour plating common to the 400-500 Myr of evolution in both jawed and jawless fishes. Here, we focus on the poachers (Agonidae), a family of armoured fishes native to temperate waters of the Pacific rim. We examined armour morphology, body stiffness and swimming performance in the northern spearnose poacher (Agonopsis vulsa) over ontogeny. As juveniles, these fishes make frequent nocturnal forays into the water column in search of food, while heavily armoured adults are bound to the benthos. Most armour dimensions and density increase with body length, as does body stiffness. Juvenile poachers have enlarged spines on their armour whereas adults invest more mineral in armour plate bases. Adults are stiffer and accelerate faster than juveniles with an anguilliform swimming mode. Subadults more closely approximate adults more than smaller juveniles, with regards to both swimming and armour mechanics. Poacher armour serves multiple functions over ontogeny, from facilitating locomotion, slowing sinking and providing defence.