Trends, cycles, interannual variability for three pelagic species west of the Antarctic Peninsula 1993-2008
Trends, cycles, interannual variability for three pelagic species west of the Antarctic Peninsula 1993-2008
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1993-2008 年南极半岛以西三种中上层物种的趋势、周期和年际变化
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发表时间：
2014
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影响因子：
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通讯作者：
K. J. Moore
中科院分区：
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作者：
R. Ross;L. Quetin;T. Newberger;C. Shaw;Janice L. Jones;S. A. Oakes;K. J. Moore
南极半岛西部的帕尔默长期生态研究研究区域正在经历变暖和季节性海冰动态变化。分析了3种中上层次级生产者在16年期间（1993 - 2008）的趋势，周期，范围扩展或最高密度位置的变化，以及种群动态的变化。所分析的物种代表不同的水文状况，并且已知对季节性海冰动态具有对比的反应：磷虾磷虾，季节性海冰区;被囊动物Salpa thompsoni，温暖的沃茨，海冰最少;以及南极银Pleuragramma anaparticum，寒冷的大陆架沃茨。在E.超级低音最大网格范围内的密度并没有减少，但最高密度的位置向南移动200公里，远离阿德利企鹅栖息地在北方结束。1999年后，S的出现频率和丰度发生了明显变化。汤普森尼。磷虾和海鞘的混合物变得很常见，但海鞘的峰值密度和峰值年的频率都没有增加。与南极磷虾一样，最高的海藻密度沿着海岸向南移动。20世纪90年代初，北方沿海地区有大量的安氏原口线虫幼虫，但1999/2000年后该地区几乎消失。这些观测结果背后的可能机制包括春季海冰边缘向南移动、源种群（海鞘）邻近度的变化以及运输途径（幼虫南极海鞘）的变化。模式相比，在西南大西洋。
The Palmer Long Term Ecological Research study region west of the Antarctic Penin- sula is experiencing warming and changing seasonal sea ice dynamics. Abundance patterns of 3 species of pelagic secondary producers were analyzed for trends, cycles, range extensions or shifts in the location of highest density, and for changes in population dynamics over a 16 yr period (1993�2008). Species analyzed represented different hydrographic regimes and are known to have contrasting responses to seasonal sea ice dynamics: krill Euphausia superba, seasonal sea ice zone; tunicates Salpa thompsoni, warmer waters with minimal sea ice; and larval Antarctic silver- fish Pleuragramma antarcticum, cold continental shelf waters. Cycles were observed in grid-wide abundance and recruitment for E. superba. Maximum grid-wide densities did not decrease, but the location of highest densities shifted southward 200 km, away from Adelie penguin rookeries at the northern end. A distinct change post-1999 was apparent in the frequency of occurrence and abundance of S. thompsoni. Mixtures of krill and salps became common, but neither peak densi- ties nor the frequency of peak years for salps increased. As with Antarctic krill, highest salp den- sities shifted southward alongshore. Larval P. antarcticum were abundant in the northern coastal region in the early 1990s, but virtually disappeared in that region after 1999/2000. Possible mech- anisms underlying these observations include the southerly movement of the sea ice edge during spring, changes in proximity of source populations (salps), and changes in transport pathways (larval P. antarcticum). Patterns are compared to those in the SW Atlantic.