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Declined fitness in larvae born from long-distance migrants of anadromous Coilia nasus in the lower reaches of the Yangtze River, China

Yan-Fei Huang Andrew L. Rypel Brian R. Murphy Song-Guang Xie

Yan-Fei Huang, Andrew L. Rypel, Brian R. Murphy, Song-Guang Xie. Declined fitness in larvae born from long-distance migrants of anadromous Coilia nasus in the lower reaches of the Yangtze River, China. Zoological Research, 2022, 43(3): 404-408. doi: 10.24272/j.issn.2095-8137.2021.423
Citation: Yan-Fei Huang, Andrew L. Rypel, Brian R. Murphy, Song-Guang Xie. Declined fitness in larvae born from long-distance migrants of anadromous Coilia nasus in the lower reaches of the Yangtze River, China. Zoological Research, 2022, 43(3): 404-408. doi: 10.24272/j.issn.2095-8137.2021.423

中国长江下游洄游性刀鲚长距离洄游群体仔鱼降低的适合度

doi: 10.24272/j.issn.2095-8137.2021.423

Declined fitness in larvae born from long-distance migrants of anadromous Coilia nasus in the lower reaches of the Yangtze River, China

Funds: This study was supported by the National Natural Science Foundation of China (32002394, 31570420). Andrew L. Rypel’s participation was supported by the Peter B. Moyle & California Trout Endowment for Coldwater Fish Conservation and the California Agricultural Experimental Station of the University of California Davis (CA-D-WFB-2467-H)
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  • 摘要: 洄游性刀鲚是长江中下游在经济和生态上具有重要价值的鱼类。依照亲体-后代的权衡理论认为,长距离洄游消耗的能量由后代增加的适合度补偿,长距离洄游群体后代的生长率和摄食会更好。该研究在刀鲚整个洄游区域设置四个采样点采集鱼类早期资源,通过分析刀鲚的早期生长和摄食揭示长距离和短距离洄游群体后代的适合度。研究结果表明,早期生长率、仔鱼的摄食强度和摄食的高营养饵料比例随着洄游距离的增加而下降,与假设不相符,这可能与由人类活动导致的河流生境改变密切相关。由于过度捕捞,刀鲚种群个体小型化严重,洄游距离明显缩短,再加上江湖阻隔,长距离洄游群体无法到达连通湖泊鄱阳湖和洞庭湖繁殖,只能在生境条件比较差的干流中繁殖。长距离洄游群体的后代又由于在洪水季节出生,遇到高流量带来的低密度饵料,因而摄食强度低,摄食的高营养饵料比例少,生长率就比河口出生的短距离群体后代慢。但这种现象可能因为现在的长江全年禁渔得到缓解,禁渔可使刀鲚长得更大活得更久,最后足以能洄游到连通湖泊的繁殖和产卵,后代在湖泊中育幼,存活率高,对群体的补充强度大。
  • Figure  1.  Abundance, body length-at-age relationships, and feeding intensity profiles of Coilia nasus larvae at Chongming, Jingjiang, Nanjing, and Anqing in the Yangtze River in 2009 and 2010

    A: Map of middle and lower reaches of the Yangtze River, China, showing four sampling sites (●) for C. nasus larvae, including locations of Datong Hydrological Station (//) and Jiujiang Meteorological Station (▲) and a picture of C. nasus. B, C: Temporal fluctuations in abundance of C. nasus larvae at Chongming (red circles), Jingjiang (blue triangles), Nanjing (black triangles), and Anqing (purple rhombus) in 2009 (B) and 2010 (C). D, E: Body length-at-age relationships of C. nasus larvae at Chongming (red circles), Jingjiang (blue triangles), Nanjing (black triangles), and Anqing (purple rhombus) in 2009 (D) and 2010 (E). Regressions were y=0.69x+3.36 (r2=0.97, 2009) and y=0.63x+4.04 (r2=0.98, 2010) at Chongming, y=0.70x+2.92 (r2=0.95, 2009) and y=0.63x+3.85 (r2=0.97, 2010) at Jingjiang, y=0.60x+3.35 (r2=0.99, 2009) and y=0.58x+3.34 (r2=0.98, 2010) at Nanjing, and y=0.58x+3.61 (r2=0.98, 2009) and y=0.57x+3.69 (r2=0.94, 2010) at Anqing, respectively. F, G: Percentage compositions of gut at different fullness levels, i.e., 0 (empty), 1 (≤25% full), 2 (≤50% full), 3 (≤75% full), 4 (full), and 5 (distended with thin stomach wall) for C. nasus larvae at Chongming, Jingjiang, Nanjing, and Anqing in the Yangtze River in 2009 (F) and 2010 (G).

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出版历程
  • 收稿日期:  2022-02-15
  • 录用日期:  2022-03-31
  • 网络出版日期:  2022-03-31
  • 刊出日期:  2022-05-18

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