Quaeck-Davies Katie, Bendall Victoria A, MacKenzie Kirsteen M, Hetherington Stuart, Newton Jason, Trueman Clive N
Ocean and Earth Science, University of Southampton, Southampton, United Kingdom.
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft, United Kingdom.
PeerJ. 2018 Jun 4;6:e4883. doi: 10.7717/peerj.4883. eCollection 2018.
Incrementally grown, metabolically inert tissues such as fish otoliths provide biochemical records that can used to infer behavior and physiology throughout the lifetime of the individual. Organic tissues are particularly useful as the stable isotope composition of the organic component can provide information about diet, trophic level and location. Unfortunately, inert, incrementally grown organic tissues are relatively uncommon. The vertebrate eye lens, however, is formed via sequential deposition of protein-filled fiber cells, which are subsequently metabolically inert. Lenses therefore have the potential to serve as biochemical data recorders capturing life-long variations in dietary and spatial ecology. Here we review the state of knowledge regarding the structure and formation of fish eye lenses in the context of using lens tissue for retrospective isotopic analysis. We discuss the relationship between eye lens diameter and body size, describe the successful recovery of expected isotopic gradients throughout ontogeny and between species, and quantify the isotopic offset between lens protein and white muscle tissue We show that fish eye lens protein is an attractive host for recovery of stable isotope life histories, particularly for juvenile life stages, and especially in elasmobranchs lacking otoliths, but interpretation of lens-based records is complicated by species-specific uncertainties associated with lens growth rates.
像鱼类耳石这样逐渐生长、代谢惰性的组织提供了生化记录，可用于推断个体一生中的行为和生理状况。有机组织特别有用，因为有机成分的稳定同位素组成可以提供有关饮食、营养级和位置的信息。不幸的是，惰性的、逐渐生长的有机组织相对较少见。然而，脊椎动物的眼球晶状体是通过充满蛋白质的纤维细胞的顺序沉积形成的，这些细胞随后代谢惰性。因此，晶状体有潜力作为生化数据记录器，捕捉饮食和空间生态的终生变化。在这里，我们在利用晶状体组织进行回顾性同位素分析的背景下，综述了关于鱼类眼球晶状体结构和形成的知识现状。我们讨论了晶状体直径与体型之间的关系，描述了在整个个体发育过程中以及不同物种之间成功恢复预期同位素梯度的情况，并量化了晶状体蛋白质与白色肌肉组织之间的同位素偏移。我们表明，鱼类眼球晶状体蛋白质是恢复稳定同位素生活史的有吸引力的宿主，特别是对于幼体生命阶段，尤其是在缺乏耳石的软骨鱼类中，但基于晶状体的记录的解释因与晶状体生长速率相关的物种特异性不确定性而变得复杂。
