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Lifetime-scale ontogenetic movement and diets of red grouper inferred using a combination of instantaneous and archival methods
Environmental Biology of Fishes ( IF 1.4 ) Pub Date : 2022-01-08 , DOI: 10.1007/s10641-022-01210-2
Julie L. Vecchio 1, 2 , Ernst B. Peebles 1
Affiliation  

Many predatory marine fishes undergo ontogenetic diet and habitat shifts as they grow. Most fishery datasets, such as catch records, length frequencies, and stomach contents, create a series of snapshots, with each captured fish representing a single timepoint during the lifespan. Chemical archives, such as eye lenses, preserve information regarding several life stages for each individual. By combining these disparate datasets, conclusions are strengthened through weight of evidence. We combined a novel archive, δ13C and δ15N bulk values in sequential eye-lens laminae, with fishery-independent catch records and stomach contents for red grouper Epinephelus morio (Valenciennes 1828) from the eastern Gulf of Mexico, USA. Eye-lens core isotope values suggest that successful individuals spend their larval period on the mid-to-outer continental shelf and locations do not vary substantially year-to-year. Profiles of δ15N values indicate that trophic position increases with size following a logarithmic growth model, while stomach contents indicate a simultaneous increase in fish proportion in the diet. Stomach contents and δ13C values together suggest that most red grouper move to nearshore waters at settlement, spend several months in shallow water with heavy benthic diet dependence, then slowly cross the continental shelf toward deeper water as they mature. With this work, we demonstrate that eye-lens isotope value profiles can enhance fisheries datasets and may provide a method of recreating diet and movement histories for species without long-term biological information.



中文翻译:

使用瞬时和档案方法相结合的红石斑鱼生命周期个体发育运动和饮食推断

许多掠食性海洋鱼类在生长过程中经历了个体遗传饮食和栖息地的变化。大多数渔业数据集,例如捕获记录、长度频率和胃内容物,都会创建一系列快照,每条捕获的鱼代表生命周期中的一个时间点。化学档案,例如眼睛镜片,保存了每个人几个生命阶段的信息。通过结合这些不同的数据集,结论通过证据的权重得到加强。我们将新的档案、连续眼晶状体薄片中的δ 13 C 和 δ 15 N 体积值与红石斑鱼Epinephelus morio 的与渔业无关的捕获记录和胃内容物相结合(Valenciennes 1828)来自美国墨西哥湾东部。眼透镜核心同位素值表明,成功的个体在中外大陆架上度过他们的幼虫期,并且位置每年变化不大。δ 15 N 值的分布表明,按照对数生长模型,营养位置随着大小的增加而增加,而胃内容物表明饮食中鱼的比例同时增加。胃内容物和δ 13C 值一起表明,大多数红石斑鱼在定居时移至近岸水域,在浅水中度过数月并严重依赖底栖食物,然后随着它们的成熟慢慢越过大陆架进入更深的水域。通过这项工作,我们证明了眼透镜同位素值剖面可以增强渔业数据集,并可能提供一种在没有长期生物信息的情况下为物种重建饮食和运动历史的方法。

更新日期:2022-01-09
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