水生生物学报2025，Vol.49Issue(10)：1-15,15.DOI:10.3724/1000-3207.2025.2025.0082
长江中下游湖泊10种常见鱼类氮磷排泄率特征及其影响因素
CHARACTERISTICS AND INFLUENCING FACTORS OF NITROGEN AND PHOSPHORUS EXCRETION RATES OF 10 COMMON FISH SPECIES IN LAKES OF THE MIDDLE AND LOWER REACHES OF THE YANGTZE RIVER
摘要
Abstract
To investigate the nitrogen and phosphorus excretion rate characteristics of fish in the middle and lower reaches of the Yangtze River and their influencing factors,samples of the nitrogen and phosphorus excretion rates and ecological stoichiometric characteristics of 10 common fish species in the middle and lower reaches of the Yangtze River were collected and analyzed from May to June 2023.Models were employed to analyze the key influencing factors of nitrogen and phosphorus excretion rates.The results showed that the nitrogen excretion rate of common fish species in these lakes ranged from 0.15 to 16.24 mg/h,and the phosphorus excretion rate ranged from 0.01 to 5.73 mg/h.Fish nitrogen and phosphorus excretion rates were significantly positively correlated with body weight(R2=0.86,P<0.001;R2=0.87,P<0.001).Larger fish excreted more nitrogen and phosphorus than smaller ones,yet the mass-specific nitrogen and phosphorus excretion rates were higher in small-sized species.There were significant differences in mass-specific nitrogen and phosphorus excretion rates among fish with different trophic guilds(P<0.001),and planktivorous fish had relatively high mass-specific nitrogen and phosphorus excretion rates.The fish nitrogen excre-tion rate was significantly negatively correlated with the body nitrogen content(R2=0.10,P<0.001),while the phospho-rus excretion rate was not correlated with the body phosphorus content.Model results indicated that body size was the key factor in predicting fish nitrogen and phosphorus excretion rates.Although diet and fish body nitrogen and phos-phorus elemental content also affected these excretion rates,their prediction in the model was poor.The ecological metabolism theory outperformed the ecological stoichiometry theory in predicting fish nitrogen and phosphorus excre-tion rates,but the effect of species classification on the model requires consideration.The results of this study are important for understanding the role of fish in the nutrient cycling process in lake ecosystems.关键词
消费者/排泄/生态化学计量学理论/生态代谢理论/养分循环Key words
Consumer/Excretion/Metabolic theory of ecology/Ecological stoichiometry theory/Nutrient cycling分类
生物科学引用本文复制引用
陶昆,张雅涵,王玥东,邓力为,徐嘉俊,冯婉婷,苑晶,王齐东..长江中下游湖泊10种常见鱼类氮磷排泄率特征及其影响因素[J].水生生物学报,2025,49(10):1-15,15.基金项目
国家重点研发计划(2023YFD2400905) （2023YFD2400905）
国家自然科学基金(32473162) （32473162）
湖北省自然科学基金杰出青年项目(2024AFA087) （2024AFA087）
中国科学院青年创新促进会(2022344)资助Supported by the National Key Research and Development Program of China(2023YFD2400905) （2022344）
National Natural Science Foundation of China(32473162) （32473162）
Hubei Provincial Natural Science Foundation of China(2024AFA087) （2024AFA087）
Youth Innovation Promotion Association CAS(2022344) （2022344）
