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Thysanoessa macrura in the southern Kerguelen region: Population dynamics and biomass
Deep Sea Research Part II: Topical Studies in Oceanography ( IF 3 ) Pub Date : 2019-12-21 , DOI: 10.1016/j.dsr2.2019.104719
Jake R. Wallis , Dale Maschette , Simon Wotherspoon , So Kawaguchi , Kerrie M. Swadling

Thysanoessa macrura is well adapted to the strong seasonality of the Southern Ocean. A flexible diet, large lipid reserves and a winter reproductive period provide T. macrura with the ability to capitalise on the pulses of primary and secondary reproduction in spring and summer. The population dynamics of T. macrura were examined over the southern Kerguelen Plateau region as part of a large-scale ecosystem assessment. Larval stages were present in high abundances, exceeding 4000 Ind. 1000 m−3, with a peak in early furcilia (FI − FIV) and lower abundances of calyptopis stages (CI − CIII) indicating the end of a prolonged spawning period. High abundances of T. macrura were recorded throughout the entire study region, although they tended to be highest over the southern extent of the Banzare Bank and Princess Elizabeth Trough. This maximum appeared to be driven by the presence of the copepod Calanoides acutus, a dominant prey source. The first biomass estimates of T. macrura were determined for the region using length-frequency and abundance distributions. A mean biomass of 1.66 mg m−3 (wet weight) was calculated for the region, however localised biomass over the southern tip of the Banzare Bank exceeded 9 mg m−3 in the upper 200 m of the water column. The high biomass of T. macrura highlights their significance as an energy-rich resource for larger predators, inferring they play a currently underappreciated role in pelagic food-webs of the Southern Ocean.



中文翻译:

南部Kerguelen地区的Thysanoessa macrura:种群动态和生物量

Thysanoessa macrura非常适合南部海洋的强烈季节性。灵活的饮食,大量的脂质储备和冬季的繁殖期使Macrura能够利用春季和夏季初次和二次繁殖的脉搏。作为大型生态系统评估的一部分,对南部克格伦高原地区的斑节对虾种群动态进行了研究。幼虫阶段以高丰度存在,超过4000 Ind。1000 m -3,在幼毛虫初期(FI-FIV)达到峰值,而花萼阶段的较低丰度(CI-CIII)表明延长的产卵期结束。T. macrura高丰度尽管在Banzare银行和伊丽莎白公主谷(Elizabeth Trough)南部地区,它们的记录最高,但在整个研究区域中都是记录的。该最大值似乎是由the足类拟南芥Calanoides acutus(一种主要的猎物来源)的存在驱动的。的第一生物量估计T. macrura用于使用长度频率和数量分布的区域进行测定。计算出该区域的平均生物量为1.66 mg m -3(湿重),但是在Banzare Bank南端的局部生物量在水柱上部200 m中超过了9 mg m -3斑潜蝇的高生物量 突显了它们作为大型捕食者的一种能源丰富资源的重要性,表明它们在南大洋中上层食物网中目前没有得到充分重视。

更新日期:2019-12-21
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