摘要
以象山港水域9种虾虎鱼为研究对象,利用稳定同位素技术分析虾虎鱼类的营养生态位和种间竞争关系。结果表明:所测样品δ13C值和δ15N值的变化范围分别为-20.4‰^-12.7‰和6.7‰~14.5‰,不同种类样品的δ15N值和δ13C值均存在显著差异;象山港虾虎鱼类营养层次整体较低,多数种类在该生态系统中起到次级消费者的作用;舌虾虎鱼(Glossogobius giuris)、矛尾虾虎鱼(Chaeturichthys stigmatias)和六丝钝尾虾虎鱼(Amblychaeturichthys hexanema)的营养生态位宽幅相对较大,而小头栉孔虾虎鱼(Ctenotrypauchen microcephalus)、绿斑缰虾虎鱼(Amoya chlorostigmatoides)和纹缟虾虎鱼(Tridentiger trigonocephalus)等营养生态位宽幅相对较小;象山港虾虎鱼类营养生态位重叠严重,小头栉孔虾虎鱼-孔虾虎鱼(Trypauchen vagina)、髭缟虾虎鱼(Tridentiger barbatus)-纹缟虾虎鱼等之间存在激烈的营养生态位竞争。
The present study determined the trophic niches of nine gobiid fishes（ Acanthogobius ommaturus,Amblychaeturichthys hexanema,Amoya chlorostigmatoides,Chaeturichthys stigmatias,Glossogobius giuris,Tridentiger barbatus,T. trigonocephalus,Ctenotrypauchen microcephalus and Trypauchen vagina） in Xiangshan Bay by analyzing stable carbon（ δ13C） and nitrogen（ δ15N） isotope ratios of fish muscle samples. The δ13C and δ15N values of nine fish species ranged from-20.4‰ to-12.7‰ and from 6.7‰ to 14.5‰,respectively. The results of ANOVA analysis indicated that δ13C and δ15N values were significantly different between all examined species. The tropic levels of all examined species ranged from 2.33 to 3.46,which indicated that most of the nine gobiid fishes were secondary consumers in the Xiangshan Bay ecosystem. The convex hull area occupied by species in δ13C- δ15N niche space was employed to represent the tropical niche width for the nine gobiid fishes. Species which had greater niche widths,such as G. giuris,C. stigmatias and A. hexanema,were potentially feeding on a wide variety of prey species typifying a more generalized diet. Alternatively,species such as C. microcephalus,A.chlorostigmatoides and T. trigonocephalus exhibited lower niche widths,indicating that these species were likely feeding on a more specialized diet. In general,the degree of trophic niche separation among nine gobiid species was relatively low. There was intensely intraspecific competition between some gobiid species,such as C. microcephalus with T. vagina,and T. barbatus with T.trigonocephalus.
出处
《生态学杂志》
CAS
CSCD
北大核心
2015年第6期1579-1585,共7页
Chinese Journal of Ecology
基金
国家公益性行业(农业)科研专项(201303047)
宁波市重大科技攻关项目(2013C11014)资助
