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首页> 外文期刊>Marine biology >Delayed recovery of giant kelp near its southern range limit in the North Pacific following El Nino
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Delayed recovery of giant kelp near its southern range limit in the North Pacific following El Nino

机译：厄尔尼诺事件之后，北海附近海域南部范围附近的巨型海带恢复延迟

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The northern distribution limit of giant kelp, Macrocystis pyrifera (Agardh), along the Pacific coast of North America is relatively stable near Point Ano Nuevo, California, but its southern limit has varied over hundreds of kilometers along the Baja California peninsula during the past 20 years. The factors that drive this variability in the southern limit were examined by: (1) quantifying the abundances of M. pyrifera and the subsurface stipitate kelp, Eisenia arborea (Areschoug), near M. pyrifera's then southern limit at Punta San Roque (27° 15'N; 114° 42'W) on ten occasions between August 1997 and June 2002 (prior to and following the 1997/1998 El Nino Southern Oscillation); (2) initiating a field manipulation at Punta San Roque in June 2000 to examine competition between these two kelp species; and (3) surveying 20 additional sites near Punta San Hipolito (27° 01'N; 114° 00'W) in June 2002 to determine whether M. pyrifera populations had recovered to their pre-1982/1983 El Nino southern range limit after ∼ 20 years of absence. These observations and the experimental results suggest that M. pyrifera is removed from its southern limit by the high temperatures and large waves associated with El Ninos, while E. arborea is able to survive and recruit in high densities and thereby delay or even prevent M. pyrifera's recovery. An inverse relationship was observed between these two species over the 5-year study. The field experiment showed that at both 4 months and 1 year after areas occupied by E. arborea were cleared, substantial recruitment of M. pyrifera occurred, while recruitment was negligible in uncleared areas. This study suggests that the southern range limit of M. pyrifera is determined by increased mortality and recruitment failure following the warm temperatures and low nutrient conditions associated with El Ninos, limited substrate availability, and by competition with the more persistent populations of E. arborea.
机译：沿着北太平洋太平洋海岸的巨型海藻Macrocystis pyrifera（Agardh）的北端分布在加利福尼亚州阿诺·努埃沃角附近相对稳定，但在过去的20年中，其南端沿下加利福尼亚半岛的变化范围超过数百公里年份。通过以下方法检查了导致南部极限变化的因素：（1）定量分析了萤火虫支原体和表皮下叶状海藻海藻（Eisenia arborea（Areschoug））的丰度，接近了当时萤火虫支原体的南部极限，即蓬塔圣罗克（27＆DEG; 1997年8月至2002年6月之间（1997/1998年厄尔尼诺南方涛动之前和之后）十次15'N; 114＆DEG; 42'W）； （2）于2000年6月在蓬塔圣罗克（Punta San Roque）开始野外操作，以研究这两种海带物种之间的竞争； （3）于2002年6月在蓬塔圣希波里托附近的另外20个地点（27＆DEG; 01'N; 114＆DEG; 00'W）进行调查，以确定是否在以后的1982/1983年厄尔尼诺现象最严重的南部地区恢复了火疫杆菌种群。 ＆SIM;缺席20年。这些观察结果和实验结果表明，由于高温和与厄尔尼诺现象相关的大浪，使发火耶尔森氏菌从其南部边界移开，而木本虫能够在高密度下存活和募集，从而延缓甚至预防了盛氏病菌。萤火虫的恢复。在为期5年的研究中，观察到这两个物种之间存在反比关系。田间试验表明，在清除了被埃博拉虫占据的区域后的四个月和一年内，发生了大量的丙酮酸莫拉氏菌募集，而在未清理区域的募集可忽略不计。这项研究表明，由于与厄尔尼诺现象相关的温暖的温度和低养分条件，有限的底物可用性以及与更持久的埃博拉大肠杆菌种群的竞争，致死率和募集失败的增加，决定了火棘分枝杆菌的南限。

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