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首页> 外文期刊>International journal of plant sciences >DEMOGRAPHICS OF MORE THAN 12,000 INDIVIDUALS OF A KEYSTONE SPECIES IN THE NORTHERN SONORAN DESERT SINCE THE MID-1800S
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DEMOGRAPHICS OF MORE THAN 12,000 INDIVIDUALS OF A KEYSTONE SPECIES IN THE NORTHERN SONORAN DESERT SINCE THE MID-1800S

机译：自MID-1800S以来北部索诺兰沙漠的12,000例梯形科物种的人口统计

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We studied a cohort-based, long-lived species to determine whether favorable periods that promote regeneration are driven by local, regional, or global-scale factors. Limited demographic data exist for the keystone species Carnegiea gigantea over its range. We obtained a data set collected for 12,232 plants over an area of more than 11 km~2 at a restricted military zone, located far from any other studied population. We developed the establishment pattern for the species over the last 200 yr and compared population growth trends with those for other sites and with global-scale volcanism, which has been previously linked to the regeneration of the species. This population was significantly related to the two closer sites, suggesting a regional influence in regeneration and cohort establishment. Other eastern sites like ours also exhibited a regeneration peak in the 1920s. This population was not significantly related to volcanic eruptions, as has been documented elsewhere, though this may be due to subsequent mortality at the site, which would have effectively erased the record of establishment in past periods. Unlike past work, our study goes beyond a single population. We synthesized data from other known populations in order to produce, for the first time, a coherent picture of the patterns of regeneration over much of the species' range. Large-scale climatic (e.g., unusually rainy periods) and geologic (global-scale volcanism) events promote the establishment of cohorts during the same time periods historically, though to differing extents in different populations: hot, western populations have particularly large cohorts in response to volcanism, while more eastern sites may have observable cohorts during known wetter periods. Thus, these different large-scale phenomena appear to be of varying significance in a population on the basis of the population's location and associated environment. This provides insight into global climate change impacts on the species, whose keystone status will ultimately affect the success of and changes in the entire biome.
机译：我们研究了以队列为基础的长寿物种，以确定促进再生的有利时期是否受到本地，区域或全球规模因素的驱动。在其范围内，主要石蜡鱼Carnegiea gigantea的人口统计数据有限。我们获得了一个数据集，该数据集是在一个限制军事区域内，距离任何其他研究人群都远的11 km〜2范围内的12,232株植物收集的。我们开发了过去200年来该物种的建立模式，并将种群增长趋势与其他站点的增长趋势以及全球规模的火山活动进行了比较，而火山活动以前与该物种的再生有关。该人群与两个较近的地点显着相关，表明在更新和队列建立方面有区域性影响。像我们这样的东部地区，也在1920年代出现了再生高峰。正如其他地方所记录的那样，该种群与火山喷发没有显着关系，尽管这可能是由于该地点随后的死亡所致，这实际上已经抹去了过去时期的火山爆发记录。与过去的工作不同，我们的研究超出了单一人群的范围。我们合成了来自其他已知种群的数据，以便首次产生出该物种大部分范围内再生模式的连贯图像。历史上，大规模的气候（例如异常多雨的时期）和地质（全球火山爆发）事件促进了队列的建立，尽管不同人群的程度有所不同：炎热的西方人群的反应特别大火山活动，而在已知的较湿润时期，更多的东部地区可能有可观测的队列。因此，根据人口的位置和相关的环境，这些不同的大规模现象在人口中似乎具有不同的意义。这提供了对全球气候变化对物种影响的洞察力，其关键地位最终将影响整个生物群落的成功和变化。

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