Marine Plant Ecology Research Group, CCMAR, Centre of Marine Sciences, University of Algarve, Gambelas, 8005-139 Faro, Portugal.
Institute of Environment, Department of Biological Sciences, OE 167, Florida International University, Miami, FL 33199, USA.
Mar Pollut Bull. 2021 Jun;167:112326. doi: 10.1016/j.marpolbul.2021.112326. Epub 2021 Apr 30.
Apart from direct light effects, we tested whether the takeover of the seagrass Thalassia testudinum by the seaweed Anadyomene sp. in high nutrient areas of Biscayne Bay, Florida, USA, is related to a faster nutrient surge uptake capacity of the seaweed and/or a negative effect on the seagrass uptake rates. Anadyomene sp. and T. testudinum showed a similar ammonium surge uptake capacity, but the seagrass performed better than the seaweed in mixed incubations at high ammonium concentrations. T. testudinum was faster than Anadyomene sp. at taking up pulses of phosphate, but the uptake rates of the seagrass were significantly decreased in the presence of the seaweed. The takeover of T. testudinum by Anadyomene sp. at Biscayne Bay is likely dominated by light and cannot be simply explained by their single or mixed nutrient surge uptake rates, but the phosphate availability and the seagrass uptake inhibition by the seaweed may also play a key role in the process.
除了直接的光照效应，我们还测试了在佛罗里达州比斯坎湾营养丰富的地区，海藻 Anadyomene sp. 是否会取代海草 Thalassia testudinum，这是否与海藻更快的养分吸收能力和/或对海草吸收速率的负面影响有关。Anadyomene sp. 和 T. testudinum 具有相似的铵突增吸收能力，但在高铵浓度下的混合培养中，海草的表现优于海藻。T. testudinum 比 Anadyomene sp. 吸收磷酸盐脉冲的速度更快，但海草的吸收速率在存在海藻的情况下显著降低。Anadyomene sp. 在比斯坎湾对 T. testudinum 的接管可能主要受光照控制，不能简单地用它们单一或混合的养分突增吸收速率来解释，但磷酸盐的可用性和海藻对海草吸收的抑制作用也可能在这个过程中起关键作用。
