Fish as sources and sinks of nutrients in lakes
Fish as sources and sinks of nutrients in lakes
复制标题
鱼类作为湖泊营养物质的来源和汇
DOI：
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发表时间：
2007
期刊：
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通讯作者：
É. Demers
中科院分区：
文献类型：
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作者：
J. Sereda;J. Hudson;W. Taylor;É. Demers
总结1。研究了安大略省两个生物操纵的贫营养湖泊——鼠湖和游侠湖中5种最丰富的鱼类（占生物量的85%）的总磷（TP）和氮（铵态氮）的释放情况。两种营养物质的比释放率与鱼体质量显著相关；log10 TP释放率（l gh）1)¼0.793（±0.109）[log10湿质量（g)] + 0.7817（±0.145），log10 N释放率（l gh）1）¼0.6946（±0.079）[log10湿质量(g)] + 1.7481（±0.108）。3. 当鱼类营养物质释放以丰度（1993-95年所有种群）和种群体积为标准时，估计鱼类在小鼠l中贡献0.083（±0.061）l gT P l（1天）1,0.41（±0.17）l gNL（1天）1，在Ranger l中贡献0.062（±0.020）l gT P l（1天）1,0.31（±0.08）l gNL（1天）1。相比之下，浮游生物总P再生速率为1.02（±0.45）l gL（1天）1（小鼠l .）和0.85（±0.19）l gL（1天）1（游侠l .）。鱼类占鼠L.浮游磷释放量的8%，游骑兵L.占7%。鱼干质量的平均体元素组成为39.3%的碳、10.9%的氮和4.0%的磷（所有鱼组合），平均摩尔C: N: P比为27.6:1。它们分别约占总磷和总氮的55%和23%。6. 鱼体内磷和氮的周转时间分别约为103和48 d。鼠湖和游侠湖浮游颗粒磷的周转时间分别为4.3 d和4.4 d。鱼类磷含量高，周转率低，是湖泊中重要的磷汇。
SUMMARY 1. The release of total phosphorus (TP) and nitrogen (N in ammonium) was measured for the five most abundant fish species (>85% of biomass) in Mouse and Ranger Lakes, two biomanipulated, oligotrophic lakes in Ontario. 2. The specific release rate of both nutrients was significantly related to fish mass; log10 TP release rate (l gh )1 ) ¼ 0.793 (±0.109) [log10 wet mass (g)] + 0.7817 (±0.145), and log10 N release rate (l gh )1 ) ¼ 0.6946 (±0.079) [log10wet mass (g)] + 1.7481 (±0.108). 3. When fish nutrient release was standardized for abundance (all populations, 1993–95) and epilimnetic volume, fish were estimated to contribute 0.083 (±0.061) l gT P L )1 day )1 , and 0.41 (±0.17) l gNL )1 day )1 in Mouse L., and 0.062 (±0.020) l gT P L )1 day )1 and 0.31 (±0.08) l gNL )1 day )1 in Ranger L. 4. In comparison, concurrent rates of total planktonic P regeneration were 1.02 (±0.45) l gL )1 day )1 (Mouse L.) and 0.85 (±0.19) l gL )1 day )1 (Ranger L.). Fish represented 8% of planktonic P release in Mouse L. and 7% in Ranger L. 5. Fish dry mass had mean elemental body compositions of 39.3% carbon, 10.9% nitrogen, and 4.0% phosphorus (all fish combined), with a mean molar C : N : P ratio of 27 : 6 : 1. This comprised about 55% and 23% of the total epilimnetic particulate P and N respectively. 6. Turnover times of P and N in fish were approximately 103 and 48 days respectively. In comparison, planktonic turnover times of particulate P in Mouse and Ranger Lakes were 4.3 and 4.4 days respectively. Given their high P content and low turnover rates, fish appear to be important P sinks in lakes.