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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Short-term shifts of stable isotope (delta C-13, delta N-15) values in juvenile sharks within nursery areas suggest rapid shifts in energy pathways
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Short-term shifts of stable isotope (delta C-13, delta N-15) values in juvenile sharks within nursery areas suggest rapid shifts in energy pathways

机译：育苗区内幼鲨中稳定同位素（δC-13，δN-15）值的短期变化表明能量途径的快速变化

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摘要

We quantified temporal changes in blood plasma delta C-13 and delta N-15 values collected from recaptured juvenile blacktip reef sharks (Carcharhinus melanopterus, n = 14) and sicklefin lemon sharks (Negaprion acutidens, n = 4) at liberty in Moorea, French Polynesia for 10-50 days, and juvenile bull sharks (Carcharhinus leucas,, n = 7) at liberty in the Florida Coastal Everglades for 34-127 days to investigate shifts in assimilated biomass from energy reserves and consumed biomass. Blacktip reef and bull sharks exhibited significant changes in plasma delta C-13 as they grew, with a mean Delta delta C-13/cm total length +/- SD of 0.41 parts per thousand/cm +/- 0.72 and-0.82 parts per thousand/cm +/- 0.67. While low sample sizes precluded statistical analyses, sicklefin lemon exhibited a change of 0.49 parts per thousand/cm +/- 0.77. Blacktip reef sharks and bull sharks also exhibited significant shifts in delta N-15 values - mean Delta delta N-15/cm TL +/- SD = -0.23 parts per thousand/cm +/- 0.59, and -0.24 parts per thousand/cm +/- 0.20; shifts in delta N-15 values for sicklefin lemon sharks averaged 0.19 parts per thousand/cm +/- 0.52. When data were normalized across species (accounting for species-specific difference in delta C-13 and delta N-15 ranges), no significant difference were found in the rate of delta N-15 change between bull and blacktip reef sharks, but mean changes in delta C-13/day among blacktip reef and sicklefin lemon sharks (similar to 1%/day) were twice as fast as bull sharks (similar to 0.5%/day). Comparisons between plasma and muscle isotope values in bull sharks yielded similar results to comparisons of plasma isotope values - rapid changes in delta C-13 and delta N-15. The magnitude and direction of changes in delta C-13 and delta N-15 values, however, were not uniform among individuals within each species, suggesting intraspecific variation in trophic interactions within the shark nurseries studied. Further studies quantifying shifts in energy pathways may contribute to elucidating the factors that shape foraging development in sharks and variation in trophic interactions within shark nurseries. (C) 2015 Elsevier B.V. All rights reserved.
机译：我们定量分析了在法国莫雷阿岛自由捕捞的幼稚黑鳍礁鲨（Carcharhinus melanopterus，n = 14）和镰刀状柠檬鲨（Negaprion acutidens，n = 4）采集的血浆δC-13和δN-15值随时间的变化。在玻利尼西亚停留10至50天，在佛罗里达沿海大沼泽地自由活动的幼年公牛鲨（Carcharhinus leucas，n = 7）停留34至127天，以调查能源储量和消耗的生物量中同化生物量的变化。黑鳍礁和公鲨在生长时血浆δC-13表现出显着变化，平均δdel C-13 / cm总长度+/- SD为每千个0.41份/ cm +/- 0.72和-0.82份千/厘米+/- 0.67。虽然样本量小，无法进行统计分析，但镰刀状柠檬的变化为0.49千分之一/ cm +/- 0.77。黑鳍礁鲨和公鲨也显示出N-15值的显着变化-平均Delta N-15 / cm TL +/- SD = -0.23份/千/ cm +/- 0.59和-0.24份/千/厘米+/- 0.20;镰刀状柠檬鲨的δN-15值变化平均为每千/厘米+/- 0.52的0.19份。当跨物种标准化数据时（考虑到C-13和N-15范围内物种特定的差异），公牛和黑鳍礁鲨之间的N-15变化率没有显着差异，但平均值变化黑鳍礁和镰刀形柠檬鲨（约每天1％）中C-13 /天的速度是公牛鲨（约0.5％/天）的两倍。鲨鱼血浆和肌肉同位素值的比较得出的结果与血浆同位素值的比较结果相似-δC-13和δN-15的快速变化。然而，在每个物种内的个体之间，ΔC-13和ΔN-15值变化的幅度和方向并不统一，这表明所研究的鲨鱼苗圃的营养相互作用具有种内差异。进一步研究量化能量途径的变化可能有助于阐明影响鲨鱼觅食发育和鲨鱼苗圃中营养相互作用变化的因素。 （C）2015 Elsevier B.V.保留所有权利。

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