Seasonality of eelgrass biomass across gradients in temperature and latitude
Seasonality of eelgrass biomass across gradients in temperature and latitude
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DOI：
10.3354/meps10800
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发表时间：
2014-01-01
影响因子：
2.5
通讯作者：
Marba, Nuria
中科院分区：
文献类型：
--
作者：
Clausen, Kevin Kuhlmann;Krause-Jensen, Dorte;Marba, Nuria
大叶藻草甸是沿海生态系统的主要结构和营养组成部分。鳗草在生态系统功能中的作用取决于草甸的生物量和生产，这在一个年度周期中可能波动很大，是沿海地区变化的主要时间驱动因素。我们分析了在大多数物种的分布范围内的温度和纬度梯度上的鳗草地上生物量、枝条密度和产量的大小和季节性，并研究了温度和/或光照在多大程度上驱动这些值的差异。鳗草物候（高峰生物量的时间，开始和结束的生长季节）表现出强烈的温度和纬度的影响，表明季节性是相当先进的温暖地区在低纬度地区相比，在高纬度地区的寒冷地区。地上生物量峰值大小、生长季长度、年平均枝密度和地上生产量均不随温度或纬度的变化而显著，表明这些参数主要受其他因子的控制。在地上生物量和拍摄密度的年度变化显着较小的地区夏季温度低，这表明，而温水人口可能会显示出很大的时间变化的生物量，冷水草甸是动态的。冷水种群具有较大的年平均生物量和在地下部分的投资更大，这些研究结果得到了支持。在所有显著的回归中，温度是一个更好的预测种群动态比纬度。这表明，在全球变暖的响应，鳗草物候可能会大大提前，并建议该物种的分布范围可能向北移动。鉴于鳗草在沿海生态系统中的关键作用，这些气候引起的变化可能会对水鸟、鱼类、无脊椎动物和利用这些草地的其他生物产生重大影响。
Eelgrass Zostera marina L. meadows are major structural and trophic components of coastal ecosystems. The role of eelgrass in ecosystem functioning depends on biomass and production of the meadows, which can fluctuate greatly during an annual cycle and be major temporal drivers of changes in the coastal zone. We analysed magnitude and seasonality of eelgrass aboveground biomass, shoot density and production across temperature and latitude gradients over the majority of the species' distributional range, and investigated to what extent temperature and/or light drive differences in these values. Eelgrass phenology (timing of peak biomass, start and end of the growing season) showed strong effects of temperature and latitude, indicating that seasonality was considerably advanced in warm areas at low latitudes compared to cold areas at high latitudes. Magnitude of peak aboveground biomass, length of the growing season, mean annual shoot density and aboveground production did not change significantly with either temperature or latitude, indicating that these parameters were controlled mainly by other factors. Annual variation in aboveground biomass and shoot density was significantly smaller in areas with low summer temperature, indicating that while warm-water populations may show substantial temporal variation in biomass, cold-water meadows are less dynamic. These findings were supported by cold-water populations having a larger mean annual biomass and a greater investment in belowground parts. In all significant regressions, temperature was a better predictor of population dynamics than latitude. This indicates that eelgrass phenology might advance considerably in response to global warming, and suggests that the distributional range of this species might be moving northwards. Given the key role of eelgrass in coastal ecosystems, these climate-induced changes might entail substantial impacts on waterbirds, fish, invertebrates and other organisms exploiting these meadows.