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Seasonal uncoupling of demographic processes in a marine clonal plant

机译：海洋克隆植物中人口过程的季节性分离

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In temperate regions, climatic factors impose a general seasonal pattern on seagrass growth that can be observed in leaf growth rates and, in small species, also in shoot density. Large variations in shoot density suggest a strong temporal uncoupling between shoot recruitment and shoot mortality, and the dependence of each of these processes on different drivers. Here we examine seasonal patterns of recruitment and mortality in the seagrass Cymodocea nodosa, one of the species most sensitive to seasonal forcing in the Mediterranean. We sampled two local populations submitted to different nutrient availability in Alfacs Bay (NW Mediterranean) and determined recruitment and mortality rates, as well as other plant traits, on a monthly basis. Our results confirm the hypothesized uncoupling, with maximum mortality 2 months after maximum recruitment. Whereas timing of recruitment was associated with light availability, and was supported by carbohydrate remobilisation, mortality was related to high water temperatures and probably also to light limitation in late summer due to self-shading. In the high-nutrient population, algal overgrowth caused further light deprivation, with mortality rates higher than in the low-nutrient population. It is emphasised that the demographic balance of the studied populations was negative for most of the year, with the exception of August and September. Therefore, caution is necessary when overall population trends are inferred from single annual sampling events.
机译：在温带地区，气候因素对海草的生长产生了普遍的季节性变化，这种变化可以从叶片的生长速度以及小物种的枝条密度中观察到。枝条密度的大变化表明，枝条募集和枝条死亡率之间存在强烈的时间解偶联，并且这些过程中的每一个都依赖于不同的驱动力。在这里，我们研究了海草Cynodocea nodosa（地中海地区对季节性强迫最敏感的物种之一）的募集和死亡的季节性模式。我们在Alfacs湾（地中海西北部）采样了两个接受不同养分供应的当地居民，并每月确定了其招募和死亡率以及其他植物性状。我们的结果证实了假设的解偶联，最大募集后2个月的死亡率最高。尽管募集的时间与光的可获得性相关，并受到碳水化合物的迁移的支持，但死亡率与高水温有关，并且还可能与夏季由于自遮阴而导致的光照受限有关。在高营养人群中，藻类的过度生长导致了进一步的轻度剥夺，死亡率高于低营养人群。需要强调的是，除了八月和九月，这一年的大部分时间里，研究人群的人口平衡都是负数。因此，从单个年度抽样事件推断总体人口趋势时，必须谨慎行事。

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