栖息地环境对种群营养生态位的影响——以黄颡鱼为例  

Impacts of habitat environment on trophic niches of a local population: a case study of yellow catfish

作　　者：沙永翠 张培育[1,2] 张欢[1,2] 苏国欢 徐军[1] 

机构地区：[1]中国科学院水生生物研究所,武汉430072 [2]中国科学院大学,北京108000

出　　处：《生态学报》2015年第5期1321-1328,共8页Acta Ecologica Sinica

基　　金：国家自然科学基金(31170439;31370473)

摘　　要：生态位是生态学研究的基础,目前关于环境指标是否直接影响营养生态位的分析研究很少。以高营养级鱼类黄颡鱼为研究对象,利用稳定同位素分析和相关分析,在太湖贡湖湾研究了氨氮、亚硝酸盐氮、硝酸盐氮、总氮、溶解性总氮、溶解性正磷酸盐、总磷、溶解性总磷、叶绿素等多个栖息地水环境因子对鱼类种群营养生态位的影响。结果表明,栖息地水环境对黄颡鱼总营养生态位影响不大,但部分栖息地水环境因子对分项营养生态位(包括浮游、底栖与肉食性)有影响。研究得知,栖息地水环境因子中氨氮、硝酸盐氮、总氮、溶解性总氮及溶解性总磷与浮游食性营养生态位显著正相关,氨氮、硝酸盐氮、总氮、溶解性总氮及溶解性总磷与肉食性营养生态位显著负相关,而底栖食性则主要受溶解性总磷的影响,与其显著正相关。水环境因子的季节变化影响水体中饵料资源的分布,进而影响鱼类的食物组成。Ecological niche is fundamental to study ecology which characterizes the relational position of a species within an ecosystem and comprises species habitat requirements as well as its functional role. It was first proposed by naturalist Joseph Grinnell in 1917 who emphasized the response of species to multitude of environmental requirements. Elton described the niche as ＂the status of an animal in its community＂who stressed the impact of species on the environment. GE Hutchinson defined the ecological niche as a multidimensional space with environmental variables as axes that species could survive and reproduce. The niche concept has undergone many changes after Hutchinson＇ s original formalization,but all alternative contemporary definitions retain the formalization of the niche as a multidimensional space. The trophic niches describing about the spectrum of consumers within the food webs and the trophic position has proven more tractable than other niche dimensions and often use dietary diversity to assess niche width. Stable isotopes especially carbon and nitrogen which are tightly linked to their diet are widely used to quantify the trophic niche. Resource richness,availability and interactions between organisms are among the factors that influence animals＇ trophic niches,but recently,the investigation concerning the impacts of habitat environment on trophic niches is very limited.In the present study,we used the convex hull occupied by all species in δ13C versus δ15N bi-plot space to represent the total extent of trophic diversity within a food web. In order to make the metrics of the isotopic niche comparable,we converted the stable isotope ratios to diet proportions using mixing models. Using stable isotope analysis and correlation analysis,we calculated the total trophic niche widths and correlation coefficients between the habitat environmental factors such as ammonia nitrogen,nitrite nitrogen,nitrate nitrogen,total nitrogen,dissolved total nitrogen,soluble reactive phosphatesalt,total phosphor

关 键 词：栖息地环境 营养生态位 浮游食性 底栖食性 食鱼食性 

分 类 号：Q958.8[生物学—动物学]