Spatial scales of benthic and pelagic producer biomass in a coastal upwelling ecosystem
Spatial scales of benthic and pelagic producer biomass in a coastal upwelling ecosystem
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DOI：
10.3354/meps327015
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发表时间：
2006-01-01
影响因子：
2.5
通讯作者：
Kinlan, Brian P.
中科院分区：
文献类型：
--
作者：
Broitman, Bernardo R.;Kinlan, Brian P.
我们研究了北美西海岸大片区域（墨西哥南下加利福尼亚州（北纬 27 度）和美国俄勒冈州（北纬 42 度）之间）底栖和中上层初级生产者生物量的空间结构。底栖初级生产者生物量的分布是通过对浅层潮下海藻林的重复航空调查确定的，而中上层初级生产者生物量是根据海景宽视场传感器 (SeaWiFS) 的近岸叶绿素 a 浓度的长期平均值确定的。空间分析表明，海带林的斑块尺度与叶绿素a浓度之间存在惊人的匹配，特征长度尺度与180公里相似。互相关分析表明，海带和浮游植物生物量在赤道方向滞后距离0~150 km、极地方向滞后距离0~30 km呈负相关。空间分析中检测到的距离大于斑块尺度的正相关表明，底栖和远洋生物量的斑块在空间上是偏移的。对海岸线特征和 AVHRR（高级甚高分辨率辐射计）的长期平均沿海海面温度异常进行的空间分析表明，底栖和远洋初级生产者生物量的空间结构与沿海上升流的地形强迫有关。我们的结果表明，海岸线地貌通过改变初级生产者生物量在特征空间尺度上的空间分布，对沿海生态系统产生强烈影响。
We studied the spatial structure of benthic and pelagic primary producer biomass over a large region on the west coast of North America, between Baja California del Sur, Mexico (27 degrees N), and Oregon, USA (42 degrees N). The distribution of benthic primary producer biomass was determined from repeated aerial surveys of shallow subtidal kelp stands, and pelagic primary producer biomass, from the long-term average of nearshore chlorophyll a concentrations from the Sea-viewing Wide Field-of-view Sensor (SeaWiFS). Spatial analyses showed a striking match between the patch scales of kelp stands and chlorophyll a concentrations, with a characteristic length scale of similar to 180 km. Cross-correlation analysis revealed that kelp and phytoplankton biomass were negatively correlated from 0 to 150 km lag distances in the equatorward direction and 0 to 30 km in the poleward direction. Positive correlations at distances longer than the patch scale detected in the spatial analysis indicated that patches of benthic and pelagic biomass were offset in space. A spatial analysis of coastline features and long-term average coastal sea surface temperature anomalies from AVHRR (Advanced Very High Resolution Radiometer) suggested that the spatial structure of benthic and pelagic primary producer biomass was associated with topographic forcing of coastal upwelling. Our results suggest that shoreline geomorphology has strong effects on coastal ecosystems, by altering the spatial distribution of primary producer biomass over characteristic spatial scales.