Density of benthic macroalgae in the intertidal zone varies with surf zone hydrodynamics
Density of benthic macroalgae in the intertidal zone varies with surf zone hydrodynamics
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潮间带底栖大型藻类的密度随冲浪区水动力的变化而变化
DOI：
10.1080/00318884.2018.1557917
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发表时间：
2019
期刊：
影响因子：
1.6
通讯作者：
Shanks, Alan L.
中科院分区：
文献类型：
--
作者：
Conser, Elena;Shanks, Alan L.
海浪带水动力影响对潮间带的补贴(幼虫移居者和浮游植物食物)；观察到，与反光海岸相比，在耗散较大的海岸，补贴要高得多。由于与沿海海洋的水交换较慢，有利于保留孢子，底栖大型藻类种群可能在反射率较高的海浪带受到青睐。此外，在反射率较高的海浪区域，无脊椎动物幼虫移居者的数量要少得多，底栖大型藻类对空间的竞争可能会较小。我们使用冲浪区宽度作为冲浪区水动力的指标；与反射性冲浪区相比，耗散性更强的冲浪区的冲浪区更宽。我们验证了这样一个假设，即随着海浪带宽度的增加，大型藻类的密度将会下降。我们使用航空近红外和可见光图像计算了俄勒冈州海岸8个潮间带站点的归一化差异植被指数(NDVI)，并将NDVI与每个特定位置的藻类生物量(每平方米干湿重)进行了比较；NDVI与藻类干湿生物量之间的线性回归显著(P<；0.01)；NDVI是大型藻类密度的准确指标。冲浪区的宽度是用谷歌地球的图像测量的。NDVI、干湿藻类生物量在较宽的海浪区显著降低(P<；P<；0.01)。尽管这种关系背后的机制尚不清楚，但潮间带大型藻类群落明显随海浪带水动力的变化而变化，如海浪带宽度所示。
Surf zone hydrodynamics influence subsidies (larval settlers and phytoplankton food) to the intertidal zone; subsidies have been observed to be much higher at more dissipative shores compared to reflective shores. Benthic macroalgal populations may be favoured at more reflective surf zones due to slower water exchange with the coastal ocean, facilitating retention of spores. In addition, larval invertebrate settlers are far less abundant at more reflective surf zones, and benthic macroalgae may experience lower competition from sessile invertebrates for space. We used surf zone width as an indictor of surf zone hydrodynamics; surf zones are wider at more dissipative surf zones compared to reflective surf zones. We tested the hypothesis that as surf zone width increases, macroalgal density would decrease. We used aerial near-infrared and visible light images to calculate the normalised difference vegetation index (NDVI) at eight intertidal sites along the Oregon coast and compared NDVI with algal biomass (dry and wet weight per square metre) at each specific location; linear regressions between NDVI and dry and wet algal biomass were significant (P< 0.01); NDVI was an accurate indicator of macroalgal density. Surf zone width was measured using Google Earth images. NDVI and dry and wet algal biomass were significantly lower at wider surf zones (P< 0.01). Although the mechanism underlying this relationship is unknown, the intertidal macroalgal community clearly varied with surf zone hydrodynamics as indicated by surf zone width.
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DOI：
--
发表时间：
2015
期刊：
影响因子：
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2017
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