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Isotopic niche overlap of two planktivorous fish in southern China

机译：中国南方两种浮游鱼类的同位素生态位重叠

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摘要

The purpose of this study was to assess if there was trophic niche overlap of silver carp (Hypophthalmichthys molitrix) and bighead carp (H. nobilis) in four large freshwater ecosystems from southern China using stable carbon and nitrogen isotopes (δ~(13)C and δ~(15)N). Multivariate analysis of variance (MANOVA) on the δ~(13)C and δ~(15)N values measured from muscle tissue indicates trophic niche overlap in one unproductive and one highly productive large system and trophic niche segregation in two systems with moderate watershed size and productivity. For these two coexisting planktivorous fish, which were hitherto believed to occupy different trophic niches, this study demonstrated that the degree of their trophic niche overlap varied according to ecosystem properties.
机译：这项研究的目的是使用稳定的碳和氮同位素（δ〜（13）C）评估来自中国南方的四个大型淡水生态系统中carp鱼（Hypophthalmichthys molitrix）和big鱼（H. nobilis）的营养位重叠。和δ〜（15）N）。从肌肉组织测得的δ〜（13）C和δ〜（15）N值的方差多变量分析（MANOVA）表明，一个非生产性和一个高生产性的大型系统中的营养位生态位重叠以及两个中等分水岭系统中的营养位生态位隔离规模和生产力。对于迄今被认为占据不同营养位的这两种同时存在的浮游鱼类，这项研究表明，它们营养位的重叠程度根据生态系统特性而变化。

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