Giant kelp (Macrocystis pyrifera) survival in deep water (25-40 m) during El Nino of 1997-1998 in Baja California, Mexico
Giant kelp (Macrocystis pyrifera) survival in deep water (25-40 m) during El Nino of 1997-1998 in Baja California, Mexico
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DOI：
10.1515/bot.2004.054
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发表时间：
2004-01-01
期刊：
影响因子：
2.2
通讯作者：
Zertuche-González, JA
中科院分区：
文献类型：
--
作者：
Ladah, LB;Zertuche-González, JA
在1997-1998年厄尔尼诺期间，我们季节性地研究了北方下加利福尼亚近海深水（25-40 m）中的巨型海带种群。虽然该地区的大多数种群完全消失，但大型可生育的成年人在整个变暖事件中幸存下来。在25米，有没有显着的变化，在1997年春季至1998年春季的变暖期间，虽然表面冠层脱落（死亡）下降到15米深的密度或每一个人的叶片数。到1998年夏季，该地点所有深度都出现了补充现象。在深度的成人生存是最有可能的干扰后恢复在周围的人口占据基质，提供营养生长，并产生孢子。在这种极端的厄尔尼诺现象期间，在深水中生存可能是由于当地的水文，例如内波将冷的富含硝酸盐的水从温跃层以下带入大陆架的更深区域，提供了一个避难所，以抵御温暖的温度，低营养物和与变暖事件相关的巨浪作用。由于内波活动，深水种群可能会在该地区的厄尔尼诺变暖中幸存下来，并且由于它们发生的深度和浅水的脱落而未被发现（
During the 1997-1998 El Nino, we examined seasonally a giant kelp population in deep water (25-40 m) off the coast of Northern Baja California. Though most populations in the region completely disappeared, large fertile adults survived the entire warming event at depth. At 25 m, there was no significant change in density or number of fronds per individual during the warming period from spring 1997 to spring 1998, though the surface canopy sloughed off (died) down to 15 m depth. By summer 1998, recruitment occurred at all depths at the site. Adult survival at depth was most likely important in post-disturbance recovery in surrounding populations by occupying substratum, providing vegetative growth, and producing spores. Survival in deep water during this extreme El Nino may have been due to local hydrography, such as internal waves bringing cool nitrate-rich water into the deeper regions of the shelf from below the thermocline, providing a refugium against the warm temperatures, low nutrients, and heavy wave action associated with warming events. Deep-water populations may regularly survive El Nino warming in this region due to internal wave activity, and go undetected due to the depth at which they occur and the sloughing of the shallow (