To gain a better understanding on the trophic ecology of New Granada sea catfish, Ariopsis canteri, and their linkage to mangroves, nitrogen, and stable carbon isotopes (δ15 N and δ13 C), as well as Bayesian mixing models, were used to explore trophic dynamics and potential ontogenetic feeding shifts across different size classes: class I (8-20 cm), class II (21-32 cm), and class III (> 32 cm). The study area was the estuary of the Atrato River Delta, where information about fish ecology is scarce. The δ13 C of size class I was lower (mean ± SD = -24.96 ± 0.69‰) than that of size classes II (-22.20 ± 0.90‰) and III (-22.00 ± 1.96‰). The δ15 N of size class I was lower (mean ± SD = 8.50 ± 0.67‰) than that of size classes II (9.77 ± 0.60‰) and III (10.00 ± 0.66‰). Body size was positively and significantly correlated to δ15 N and δ13 C. Individuals with LT > 32 cm presented the highest estimated trophic position (3.8). Five-source mixing models indicated that for class I, the mean estimated contribution of macroalgae was highest (6% to 57% CI), for classes II and III, the mean estimated contribution of macrophytes were the highest (3% to 53% CI and 4% to 53% CI, respectively). Ontogenic feeding shifts of A. canteri were confirmed evidencing decreasing intraspecific competition between small and large individuals. Results suggest that mangroves are a nursery and feeding ground habitat for this species and that mangrove supporting A. canteri is due mainly to the substrate/habitat that supports sources in the food webs. These results can be used in ecosystem-based fishery management focused on the protection of extensive mangroves areas in the southern Caribbean Sea. Bayesian mixing models, Southern Caribbean Sea, Urabá Gulf, Mangroves, size structure. This article is protected by copyright. All rights reserved.

中文翻译：

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稳定同位素分析揭示了依赖红树林的捕食者新格拉纳达海鲶、拟南芥的有机物质来源和个体发育的摄食变化

为了更好地了解新格拉纳达海鲶的营养生态学，Ariopsis canteri 及其与红树林、氮和稳定碳同位素（δ15 N 和 δ13 C）的联系以及贝叶斯混合模型被用于探索营养不同体型的动态和潜在个体发育喂养变化：I 类（8-20 厘米）、II 类（21-32 厘米）和 III 类（> 32 厘米）。研究区域是阿特拉托河三角洲的河口，那里的鱼类生态信息很少。尺寸等级 I 的 δ13 C（平均值± SD = -24.96 ± 0.69‰）低于尺寸等级 II (-22.20 ± 0.90‰) 和 III (-22.00 ± 1.96‰)。尺寸等级 I 的 δ15 N（平均值 ± SD = 8.50 ± 0.67‰）低于尺寸等级 II (9.77 ± 0.60‰) 和 III (10.00 ± 0.66‰)。体型与δ15 N和δ13 C呈显着正相关。LT > 32 cm 的个体呈现出最高的估计营养位置 (3.8)。五源混合模型表明，对于I类，大型藻类的平均估计贡献最高（6％至57％CI），对于II类和III类，大型植物的平均估计贡献最高（3％至53％CI）和 4% 至 53% CI）。确认了 A. canteri 个体发生的摄食变化，这证明了小个体和大个体之间的种内竞争减少。结果表明，红树林是该物种的苗圃和觅食地栖息地，支持 A. canteri 的红树林主要是由于支持食物网来源的基质/栖息地。这些结果可用于基于生态系统的渔业管理，重点是保护加勒比海南部广阔的红树林地区。贝叶斯混合模型、南加勒比海、乌拉巴湾、红树林、大小结构。本文受版权保护。版权所有。