摘要
以乌江流域亲缘关系近,但分布并不完全重叠的马口鱼(Opsariichthys bidens)和宽鳍鱲(Zacco platypus)作为实验对象,分别考察这两种实验鱼的低氧耐受及游泳运动能力。将野外采回的实验鱼置于(25±1)℃条件下,分别测定两种鱼的临界氧分压(Pcrit)、水面呼吸(ASR)、失去平衡点(LOE)以及在不同溶氧水平(8.0、4.0和2.0 mg/L)下的临界游泳速度(Ucrit)和活跃耗氧率(MO2active)。研究发现:马口鱼的Pcrit(2.44±0.20)mg/L显著高于宽鳍鱲(1.86±0.10)mg/L(P=0.031)。但马口鱼的50%ASR(1.23±0.16)mg/L显著低于宽鳍鱲(1.97±0.11)mg/L(P=0.023);马口鱼的50%LOE(0.84±0.01)mg/L同样显著低于宽鳍鱲(0.97±0.02)mg/L(P=0.004)。宽鳍鱲在8.0和4.0 mg/L下的游泳能力显著高于马口鱼,然而马口鱼和宽鳍鱲的Ucrit均随测定溶氧水平的下降而显著降低(P<0.01);宽鳍鱲和马口鱼的运动耗氧率均随水流速度的增加而呈现指数增加,但随测定溶氧水平的降低运动耗氧曲线变得相对平缓,尤其是在溶氧为4.0 mg/L时马口鱼的运动耗氧曲线与宽鳍鱲相比越发平缓;两种实验鱼的MO2active随溶氧水平下降的变化趋势与Ucrit相似(P<0.001)。结果表明:两种野外生存的实验鱼不仅在低氧耐受能力方面存在显著差异,而且两者的游泳运动能力也有不同表现,这很有可能与其遗传特征、生存环境及生态习性相关。
Two genetic closely related cyprinids-hook snout carp（ Opsariichthys bidens） and pale chub（ Zacco platypus）with incompletely overlapped habitats in Wu River-were selected as experimental models to investigated the difference of hypoxia tolerance and locomotor performance between two fish species and whether the possible exist difference be related with the distributed habitats. We first measured the critical oxygen tension（ Pcrit）,aquatic surface respiration（ ASR） and loss of equilibrium（ LOE） as the hypoxia indicators. Then we measured the critical swimming speed（ Ucrit） and active oxygen consumption rate（ MO2active） at different dissolved oxygen level（ 8.0,4.0 and 2.0 mg/L,respectively） at（ 25.0±1. 0） ℃. The Pcritof hook snout carp（ 2.44±0.20） mg / L were significantly higher than that of pale chub（ 1.86±0.10） mg /L（ P = 0.031）. However,the dissolved oxygen level at which 50% fish performing ASR（ P = 0.023） and LOE（ P = 0. 004）in hook snout carp（ ASR：（ 1. 23 ± 0. 16） mg / L; LOE：（ 0. 84 ± 0. 01） mg / L） were significantly lower than those in pale chub（ ASR：（ 1.97±0.11） mg / L; LOE：（ 0.97±0.02） mg / L）. Both the Ucritand MO2 activeof hook snout carp and pale chubreduced significantly with the decreased dissolved oxygen level（ P = 0. 008 and P = 0. 002,respectively）; The swimming oxygen consumption rate of hook snout carp and pale chub increased exponentially with increasing swimming speed.However,the swimming speed-oxygen consumption curve became relatively flat at lower testing dissolved oxygen levels. The swimming speed-oxygen consumption curve of hook snout carp was more gently compared with that of pale chub at the dissolved oxygen level of 4.0 mg / L. The present study demonstrated that there were significant differences in both hypoxia tolerance and swimming performance between hook snout carp and pale chub which may be crucial to its survival in the field. The difference may be due to the difference of eco
出处
《生态学报》
CAS
CSCD
北大核心
2014年第20期5860-5867,共8页
Acta Ecologica Sinica
基金
国家自然科学基金项目(31172096)
重庆科技创新能力建设项目(CSTC2010CA1010)
关键词
宽鳍鱲
马口鱼
水面呼吸
临界氧分压
失去平衡点
临界游泳速度
hook snout carp（Opsariichthys bidens）
pale chub（Zacco platypus）
aquatic surface respiration（ASR）
critical oxygen tension（Pcrit）
loss of equilibrium（LOE）
critical swimming speed（Ucrit）
