Ontogenetic shift in buoyancy and habitat in the Antarctic toothfish, Dissostichus mawsoni (Perciformes: Nototheniidae)
Ontogenetic shift in buoyancy and habitat in the Antarctic toothfish, Dissostichus mawsoni (Perciformes: Nototheniidae)
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南极齿鱼 Dissostichus mawsoni（鲈形目：Nototheniidae）浮力和栖息地的个体发生变化
DOI：
10.1007/s00300-002-0459-7
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发表时间：
2003
期刊：
影响因子：
1.7
通讯作者：
A. Devries
中科院分区：
文献类型：
--
作者：
T. Near;S. Russo;Christopher D. Jones;A. Devries
为了研究年龄对浮力和栖息地利用的影响，对70只采自南斯科舍弧区和南极洲麦克默多湾的毛氏盘尾鱼个体进行了浮力测量和捕获深度测量。标准长度(SL)为10.4~138.0 cm。幼体不浮力(在水中重)，而成体则中性浮力。浮力与SL之间的关系斜率对于青少年(SL小于81 cm)呈显著负相关，而对于成年人(大于81 cm SL)则没有显著的关系。这些结果证明了浮力的个体发生转变。对于青少年，捕获深度和SL之间存在显著的正相关关系。当个体成年时，他们获得中性浮力，并似乎使用更深的水域栖息地。这一解释得到了幼体浮力和捕获深度之间显著正相关的支持。随着幼鱼的成熟，浮力的变化也可能与栖息地使用的变化有关。幼鱼似乎利用海底栖息地，而成年鱼在更深的水域中使用整个水柱。考虑到在这些栖息地可获得的猎物种类的差异，根据我们的结果，我们预测青少年和成年人的饮食应该有很大的不同。我们还假设，幼体成熟期间饮食中脂肪沉积的积累可能是浮力个体发育变化的原因，并允许在成年期实现中性浮力。
Buoyancy measurements and depth of capture were taken on 70 individuals of Dissostichus mawsoni collected from the Southern Scotia Arc and McMurdo Sound, Antarctica, to examine the effect of age on buoyancy and habitat use. Standard lengths (SL) ranged from 10.4 to 138.0 cm. Juveniles were not buoyant (heavy in water), whereas adults were neutrally buoyant. The slope of the relationship between buoyancy and SL was significantly negative for juveniles (individuals less than 81 cm SL), but there was no significant relationship for adults (individuals greater than 81 cm SL). These results demonstrate an ontogenetic shift in buoyancy. For juveniles, depth of capture and SL had a significantly positive relationship. As individuals reach adulthood they achieve neutral buoyancy and appear to use deeper water habitats. This interpretation is supported by a significant positive correlation between buoyancy and depth of capture for juveniles. Changes in buoyancy with maturation of juveniles may also be associated with a shift in habitat use. Juveniles appear to exploit benthic habitats, whereas adults use the entire water column over deeper water. Given the differences in prey species available in these habitats and based on our results, we predict that diets of juveniles and adults should differ significantly. We also hypothesize that accumulation of lipid deposits from the diet during maturation of juveniles may account for the ontogenetic shift in buoyancy and allow neutral buoyancy to be achieved in adulthood.