Environmental factors influencing primary productivity of the forest-forming kelp Laminaria hyperborea in the northeast Atlantic.
Environmental factors influencing primary productivity of the forest-forming kelp Laminaria hyperborea in the northeast Atlantic.
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影响东北大西洋造林海带海带初级生产力的环境因素。
DOI：
10.1038/s41598-020-69238-x
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发表时间：
2020
影响因子：
4.6
通讯作者：
Smale DA
中科院分区：
文献类型：
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作者：
Smale DA
对于许多陆地生态系统，初级生产力的速率和驱动因素已得到很好的了解，但对于许多海洋生态系统，特别是沿海底栖环境中的海洋生态系统，仍然没有得到很好的解决。我们量化的净初级生产力（NPP），使用两种方法，以及海带森林（海带hyperborea）在多个潮下带栖息地在英国（UK）的碳常备库存。研究地点横跨纬度9°，平均温度梯度约为2.5 °C。除了温度，我们还测量了其他可能影响生产力的因素（例如光照强度，水流，营养物质，海胆密度）。虽然NPP的估计值在不同地点之间变化很大，范围从166到738 g C m-2 yr-1，但我们的研究范围平均值为340 g C m-2 yr-1，表明L.热带雨林的生产力很高。我们观察到在我们最冷的最北端站点和最温暖的最南端站点之间的NPP和碳现存量之间存在明显差异，北方站点的NPP和现存量分别约为1.5倍和2.5倍。海洋温度被认为是生产力的一个可能驱动因素，在较温暖的沃茨观察到净初级生产力和现存量减少。光的可用性也与碳积累和储存密切相关，增加光照水平与NPP和现存量呈正相关。在其地理范围内，总净初级生产力从毫升。hyperborea估计约为7.61 Tg C yr-1。这种生物量生产可能对当地食物网很重要，是对遥远生境的营养补贴，也是对近岸碳循环和（潜在的）碳固存的重要补充。然而，鉴于与温度的密切联系，东北大西洋的海洋持续变暖可能会降低这一基础物种的初级生产力，因为超过了生长和表现的最佳温度。
Rates and drivers of primary productivity are well understood for many terrestrial ecosystems, but remain poorly resolved for many marine ecosystems, particularly those within in coastal benthic environments. We quantified net primary productivity (NPP) using two methods as well as carbon standing stock within kelp forests (Laminaria hyperborea) at multiple subtidal habitats in the United Kingdom (UK). Study sites spanned 9° in latitude and encompassed a gradient in average temperature of ~ 2.5 °C. In addition to temperature, we measured other factors (e.g. light intensity, water motion, nutrients, sea urchin density) that may influence productivity. Although estimates of NPP were highly variable between sites, ranging from 166 to 738 g C m-2yr-1, our study-wide average of 340 g C m-2yr-1indicated thatL. hyperboreaforests are highly productive. We observed clear differences between NPP and carbon standing stock between our cold northernmost sites and our warm southernmost sites, with NPP and standing stock being around 1.5 and 2.5 times greater in the northern sites, respectively. Ocean temperature was identified as a likely driver of productivity, with reduced NPP and standing stock observed in warmer waters. Light availability was also strongly linked with carbon accumulation and storage, with increased light levels positively correlated with NPP and standing stock. Across its geographical range, total NPP fromL. hyperboreais estimated at ~ 7.61 Tg C yr-1. This biomass production is likely to be important for local food webs, as a trophic subsidy to distant habitats and for inshore carbon cycling and (potentially) carbon sequestration. However, given the strong links with temperature, continued ocean warming in the northeast Atlantic may reduce primary productivity of this foundation species, as optimal temperatures for growth and performance are surpassed.