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首页> 外文期刊>Hydrobiologia >Stable isotope analysis reveals relative influences of seasonal hydrologic variation and impoundment on assimilation of primary production sources by fish in the Upper Yesilırmak River, Turkey
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Stable isotope analysis reveals relative influences of seasonal hydrologic variation and impoundment on assimilation of primary production sources by fish in the Upper Yesilırmak River, Turkey

机译:稳定的同位素分析显示,土耳其耶西尔马克河上游的季节性水文变化和蓄水对鱼类同化主要生产来源的相对影响

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This study analyzed variation in stable isotope ratios of aquatic and terrestrial primary producers and two common cyprinid fishes (Capoeta banarescui and Squalius cephalus) at seven sites in the upper Yeşilırmak River Basin, Turkey, to estimate relative contributions of basal production sources to fish biomass. We hypothesized that seasonal and spatial variation in fish assimilation of basal production sources would be affected by hydrological variation, with results for a reach downstream from a reservoir differing from those from upstream sites. Carbon and nitrogen isotopic ratios of primary producers and S. cephalus and δ15N of C. banarescui revealed significant spatial variation. δ13C of primary producers, δ15N of S. cephalus, and both δ13C and δ15N of C. banarescui revealed significant seasonal variation. C. banarescui biomass in the river channel was mostly derived from terrestrial herbaceous plants, and its biomass in the reservoir derived mostly from aquatic plants. Estimated proportional contributions of herbaceous plants to both species were greatest at the downstream site during spring, and declined during summer in the case C. banarescui. Overall, the influence of the dam was small relative to effects from watershed characteristics and seasonal changes in temperature and hydrology.
机译:这项研究分析了土耳其耶西勒马克河流域上游七个地点的水生和陆生初级生产者以及两种常见的鲤科鱼类(Capoeta banarescui和Squalius cephalus)的稳定同位素比变化,以估算基础生产来源对鱼类生物量的相对贡献。我们假设,基础生产源的鱼类同化的季节和空间变化将受到水文变化的影响,水库下游到达的结果与上游地点不同。主要生产者和头颅链球菌的碳氮同位素比和香蕉钩球菌的δ15N表现出显着的空间变化。初级生产者的δ13C,头孢链球菌的δ15N,巴氏梭菌的δ13C和δ15N都显示出明显的季节变化。河道中的C. banarescui生物量主要来源于陆生草本植物,水库中的生物量主要来源于水生植物。春季,下游地区的草本植物对这两个物种的比例贡献最大,而在夏天,C。banarescui则下降了。总体而言,相对于流域特征以及温度和水文学季节性变化的影响,大坝的影响较小。

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