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Dietary niche differentiation in a mesopredatory dasyatid assemblage

机译：膳食利基分化在凹陷的达腹组合中

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Most batoids are mesopredators and are often hypothesised to play important ecological roles. However, a comprehensive understanding into these roles remains limited given the paucity of information of their trophic habits. St. Joseph Atoll (5.43 degrees mml:mspace width="0.333333em" mml:mspace S, 53.35 degrees mml:mspace width="0.333333em" mml:mspace E) is a remote ecosystem that hosts a resident assemblage of dasyatids (Pastinachus ater, Urogymnus granulatus, and U. asperrimus). Both stomach contents (SC) and stable isotope samples (SI) (delta 15N and delta 13C) were collected in 2015 and used to investigate the trophic niches of this dasyatid assemblage and whether these niches differed inter- and intra-specifically. Dasyatid muscle samples as well as baseline samples of potential prey species and primary producers were collected for SI analyses. SC data highlighted significant inter-specific differences in diet, U. granulatus juveniles mostly consumed decapod crustaceans (Callianassidae and Portunidae) and P. ater juveniles mostly consumed bivalve molluscs. The mean species trophic positions for juveniles of all three species ranged from 2.9 to 3.6 when calculated using delta 15N and from 3.4 to 3.6 when calculated using stomach content data. Analysis of delta 13C showed that all juveniles were reliant upon the same carbon resources (primarily derived from seagrass beds) at the base of the food web. Diet appeared to change with size as larger individuals displayed lower delta 13C and higher delta 15N compared to smaller juveniles. Additionally, isotope values of the smallest individuals were similar to the largest individuals, suggesting maternal meddling. The identified patterns of inter- and intra-specific trophic niche differentiation may be indicative of competitive effects and contributes to the understanding of mesopredators in community trophic dynamics.
机译：大多数巴伐太饼都是中型器，通常假设，以发挥重要的生态作用。然而，考虑到他们的营养性习惯的信息的缺乏，对这些角色的全面了解仍然有限。圣约瑟夫环节（5.43毫升MML：MSPACE宽度=“0.333333”MML：MSPace S，53.35度MML：MSPACE宽度=“0.333333EM”MML：MSPACE E）是一个远程生态系统，托管达腹湿的居民组合（Pastinachus ater，尿瘤肉芽肿和asperrimus）。 2015年收集胃内容物（SC）和稳定同位素样品（Si）（Si）（Delta 15N和Delta 13c），并用于研究该达腹组合的营养效力，以及这些耐药性是否不同地差异。达塞糊糊肌样以及潜在猎物物种和初级生产者的基线样品进行CI分析。 SC数据强调了饮食中的显着特异性差异，U.Granulatus少年大多消耗甲板甲壳类动物（Callianasisidae和Portunidae）和P.Ter少年大多消耗了双级软体动物。当使用胃内容数据计算时，所有三种物种的幼稚的幼稚的平均物种营养次数范围为2.9至3.6。 Delta 13c的分析表明，所有青少年都依赖于食品网底部的相同碳资源（主要来自海草床）。与较小的少年相比，较大的个体显示较大的Δ13c和较高的delta 15n，饮食似乎随大小而变化。此外，最小个人的同位素值与最大的个人类似，表明产妇干预。鉴定的特异性营养不良的利基分化的鉴定模式可以指示竞争效果，有助于了解社区营养动态中的中型器。

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    《Marine biology》 |2020年第7期|89.1-89.15|共15页
  • 作者

    Elston Chantel; Cowley Paul D.; von Brandis Rainer G.; Fisk Aaron;

  • 作者单位

    Rhodes Univ Dept Ichthyol & Fisheries Sci Grahamstown South Africa;

    South African Inst Aquat Biodivers Grahamstown South Africa;

    Save Our Seas Fdn DArros Res Ctr Darros Isl Seychelles;

    Univ Windsor Sch Environm Windsor ON Canada;

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