Sensitivity of sand lance to shifting prey and hydrography indicates forthcoming change to the northeast US shelf forage fish complex

Sensitivity of sand lance to shifting prey and hydrography indicates forthcoming change to the northeast US shelf forage fish complex
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沙矛对移动猎物和水文学的敏感性表明美国东北部陆架饲料鱼群即将发生变化

DOI:
10.1093/icesjms/fsaa251
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发表时间:
2021
影响因子:
3.3
通讯作者:
Thompson, Michael A
Thompson, Michael A
中科院分区:
农林科学2区
文献类型:
--
作者:
Suca, Justin J;Wiley, David N;Silva, Tammy L;Robuck, Anna R;Richardson, David E;Glancy, Sarah G;Clancey, Emily;Giandonato, Teresa;Solow, Andrew R;Thompson, Michael A

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北方沙矛鱼(Ammodyteslancus)和大西洋鲱鱼(Clupeaharengus)是美国东北部大陆架主要的富含脂质的饲料鱼类,是许多顶级捕食者的重要猎物。然而,与大西洋鲱鱼不同的是,对沙矛的研究很少,也没有关于其丰富程度的驱动因素的信息。我们使用一年内的测量沙矛饮食,生长和条件来解释每年的变化,在美国东北部大陆架的沙矛丰度。我们的观察表明,北方沙矛饲料,生长,并积累脂质在冬末至夏季,主要消耗桡足类哲水蚤finmarchicus。然后停止进食,利用脂质,并在秋季开始性腺发育。我们发现C. finmarchicus影响沙矛亲本条件和招募。大西洋鲱鱼可以通过行会内的捕食静音这种效果。水文进一步影响砂矛丰富的增加,温暖的斜坡水减少越冬存活的生殖成人。这些驱动程序的预测变化表明,沙矛将不再能够填补的作用,富含脂质的饲料在大西洋鲱鱼丰度低的时候,改变美国东北部的货架饲料鱼复杂的世纪结束。
Northern sand lance (Ammodytes dubius) and Atlantic herring (Clupea harengus) represent the dominant lipid-rich forage fish species throughout the Northeast US shelf and are critical prey for numerous top predators. However, unlike Atlantic herring, there is little research on sand lance or information about drivers of their abundance. We use intra-annual measurements of sand lance diet, growth, and condition to explain annual variability in sand lance abundance on the Northeast US Shelf. Our observations indicate that northern sand lance feed, grow, and accumulate lipids in the late winter through summer, predominantly consuming the copepodCalanus finmarchicus. Sand lance then cease feeding, utilize lipids, and begin gonad development in the fall. We show that the abundance ofC. finmarchicusinfluences sand lance parental condition and recruitment. Atlantic herring can mute this effect through intra-guild predation. Hydrography further impacts sand lance abundance as increases in warm slope water decrease overwinter survival of reproductive adults. The predicted changes to these drivers indicate that sand lance will no longer be able to fill the role of lipid-rich forage during times of low Atlantic herring abundance—changing the Northeast US shelf forage fish complex by the end of the century.
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