安第斯少营养河流中硅藻多样性的驱动因素

IF 0.9 4区 环境科学与生态学 Q4 LIMNOLOGY Annales De Limnologie-international Journal of Limnology Pub Date : 2022-01-01 DOI:10.1051/limn/2022003
Jhon C. Donato-R., Hooz A. Mendivelso, Edna L. Pedraza-Garzón, S. Sabater
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引用次数: 0

摘要

一项原位实验发现,氨N-NH4+、硝酸盐N-NO3 -和磷酸盐P-PO43 -对安第斯山脉贫营养河流的硅藻组成和多样性有显著影响。在9个月的时间里,研究人员对河流的受精和未受精部分的环境特征和硅藻组成进行了研究。与上游自然发生的营养物质浓度相比,下游部分的营养物质浓度增加了三倍。Alpha多样性(Shannon-Wiener [H]和Simpson [S]指数)按月测定。在未施肥对照区,硅藻多样性与水流量和磷、氮浓度显著相关(p≤0.05)。施肥剖面的多样性与氨磷含量的增加有关。冗余分析(RDA)表明,电导率、水流和营养物浓度对硅藻组合组成有影响(前两个轴83%)。小粒棘球蚴、胎盘球虫和癣癣的发生与低磷浓度有关。小棘球绦虫(Epithemia adnata vara . minor)、耗散棘球绦虫(Nitzschia disispata sinuata)和雷默蝇(Reimeria sinuata)与高磷浓度、高水流量和低电导率相关;
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Drivers of the diversity of diatoms in an oligotrophic Andean stream
An in situ experiment determined that the addition of ammonia N-NH4+, nitrate N-NO3– and phosphate P-PO43– to an oligotrophic Andean stream significantly affected diatom composition and diversity. Over a nine-month period, fertilized and non-fertilized sections of the stream were studied for their environmental characteristics and diatom composition. Nutrient concentrations were increased three times in a downstream section with respect to those occurring naturally upstream. Alpha diversity (Shannon-Wiener [H”] and Simpson [S] indices) were determined monthly. In the non-fertilized control section, diatom diversity was significantly (p ≤ 0.05) related to water flow and P and N concentrations. In the fertilized section diversity was associated to the enhanced ammonia and phosphorus. A redundancy analysis (RDA) showed that conductivity, water flow and nutrient concentrations contributed to the diatom assemblage composition (83% along the first two axes). Achnanthidium minutissimum, Cocconeis placentula, and Epithemia sorex occurrence was related to low phosphorus concentration. Epithemia adnata var. minor, Nitzschia dissipata, and Reimeria sinuata were associated with high P concentrations, high water flow and low conductivity Navicula rynchocephala, Gomphonema parvulum, Navicula capitatoradiata, and Melosira varians were associated with high P.
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来源期刊
CiteScore
2.20
自引率
0.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: Annales de Limnologie - International Journal of Limnology publishes papers on the ecology of freshwater systems, ranging from studies of aquatic organisms, physical and chemical works which relate to the biological environment, to ecological applications and frameworks for water management directives. Main topics: Ecology of freshwater systems ; biodiversity, taxonomy, distribution patterns in space and time, biology of animals and plants ; experimental and conceptual studies which integrate laboratory and/or field work on physiology, population dynamics, biogeochemistry and nutrient dynamics, management, mathematical modelling ; techniques for sampling and chemical analyses, ecological applications, procedures which provide frameworks for environmental legislation.
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