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首页> 外文期刊>Aquatic Sciences >Fish feeding groups, food selectivity, and diet shifts associated with environmental factors and prey availability along a large subtropical river, China
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Fish feeding groups, food selectivity, and diet shifts associated with environmental factors and prey availability along a large subtropical river, China

机译：中国大型亚热带河流的鱼类摄食群体，食物选择性和饮食变化与环境因素和猎物的可获得性相关

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摘要

Understanding spatial variation in fish trophic structures along large river systems remains a challenge, and the influence of fish food selectivity and diet shifts on these structures remains unknown. In this study, the assemblage composition and stomach contents of fish in the subtropical East River of southern China were analyzed to determine their diet composition (DC) and identify prey-oriented feeding groups. Ten prey items were identified and used to cluster 106 fish species into 23 feeding groups. The number of groups increased longitudinally due to the accumulated emergence of site-specific prey sources in fish DC, although this number decreased sharply near the estuary due to the loss of insectivorous fish. The fish assemblages showed a longitudinal decrease in abundance and an increase in biomass, with higher values observed in the rainy season than the dry season. A downstream decrease in insectivores and epiphytivores and increase in detritivores and molluscivores represented the basic patterns observed along the river. Seven widespread fish species exhibited spatial dietary shifts, among which three generalist feeders with a high abundance notably influenced the fish trophic structures, and four specialist feeders with high food selectivity were significantly (P0.05) correlated with prey availability. Multivariate data analysis showed that the flow velocity, water depth, riffle areas, and nutrient concentrations were the key environmental factors that determined the distribution of fish feeding groups, while hydrophytes, plant debris, Ephemeroptera and Odonata insects, and Atyidae shrimp were the key prey sources.
机译：理解大型河流系统中鱼类营养结构的空间变化仍然是一个挑战，鱼的食物选择性和饮食变化对这些结构的影响仍然未知。在这项研究中，分析了中国南方亚热带东河的鱼类的组成成分和胃含量，以确定其饮食成分（DC）并确定以猎物为食的喂养组。确定了十个猎物，并将其用于将106种鱼类聚集到23个饲养组中。鱼类种群数量的增加归因于鱼类DC中特定地点猎物源的不断涌现，尽管由于食虫性鱼类的丧失，该种群数量在河口附近急剧减少。鱼群显示出纵向的丰度下降和生物量的增加，在雨季观察到的值高于旱季。沿河观测到的基本模式是，食虫和附生动物的下游减少以及杀虫和软体动物的增加。七个广泛分布的鱼类表现出空间饮食变化，其中三个高丰度的普通饲养者对鱼的营养结构有显着影响，而四个高食物选择性的特殊饲养者与猎物的可获得性显着相关（P <0.05）。多元数据分析表明，流速，水深，浅滩面积和养分浓度是决定鱼类摄食组分布的关键环境因素，而水生植物，植物残体，星翅目和昆虫纲昆虫以及A科虾是主要的猎物。资料来源。

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  • 来源
    《Aquatic Sciences》 |2019年第2期|31.1-31.18|共18页
  • 作者

    Wang Sai; Tang Jin-Peng; Su Lin-Hui; Fan Jing-Jing; Chang Hao-Yen; Wang Tuan-Tuan; Wang Lin; Lin Hsing-Juh; Yang Yang;

  • 作者单位

    Jinan Univ, Dept Ecol, Res Ctr Hydrobiol, Guangzhou 510632, Guangdong, Peoples R China|Jinan Univ, Res Ctr Trop & Subtrop Aquat Ecol Engn, Minist Educ Engn, Guangzhou 510632, Guangdong, Peoples R China;

    Jinan Univ, Dept Ecol, Res Ctr Hydrobiol, Guangzhou 510632, Guangdong, Peoples R China;

    Jinan Univ, Dept Ecol, Res Ctr Hydrobiol, Guangzhou 510632, Guangdong, Peoples R China;

    Jinan Univ, Dept Ecol, Res Ctr Hydrobiol, Guangzhou 510632, Guangdong, Peoples R China;

    Natl Chung Hsing Univ, Dept Life Sci, Taichung 402, Taiwan|Natl Chung Hsing Univ, Innovat & Dev Ctr Sustainable Agr, Taichung 402, Taiwan;

    Jinan Univ, Dept Ecol, Res Ctr Hydrobiol, Guangzhou 510632, Guangdong, Peoples R China|Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Jinan Univ, Dept Ecol, Res Ctr Hydrobiol, Guangzhou 510632, Guangdong, Peoples R China;

    Natl Chung Hsing Univ, Dept Life Sci, Taichung 402, Taiwan|Natl Chung Hsing Univ, Innovat & Dev Ctr Sustainable Agr, Taichung 402, Taiwan;

    Jinan Univ, Dept Ecol, Res Ctr Hydrobiol, Guangzhou 510632, Guangdong, Peoples R China|Jinan Univ, Res Ctr Trop & Subtrop Aquat Ecol Engn, Minist Educ Engn, Guangzhou 510632, Guangdong, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    East River; Stomach content analysis; Diet composition; Prey items; Fish trophic structure; Widespread species;

    机译：东江;胃液含量分析;饮食组成;猎物;鱼类营养结构;广谱种;

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