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首页> 外文期刊>Marine biology >Expansive covers of turf-forming algae on human-dominated coast: the relative effects of increasing nutrient and sediment loads
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Expansive covers of turf-forming algae on human-dominated coast: the relative effects of increasing nutrient and sediment loads

机译：人为主导的海岸上形成草皮的藻类的广泛覆盖：养分和沉积物负荷增加的相对影响

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Turf-forming algae form more extensive habitat on subtidal rock adjacent to urban than non-urban coast of South Australia. This pattern is frequently observed on the world's temperate coasts and is variously considered to be a result of enhanced concentration of nutrients or rates of sediment deposition on urban coasts. We experimentally tested which of three components of environmental change (increased nutrients in water, increased nutrients in sediments and increased sediment deposition) best explain the expansive covers of turf-forming algae on urban coasts. All three treatments had independent and positive effects on the percentage cover of turf-forming algae. The addition of nutrients from the water column had the largest influence (omega(2)=0.55), which was more than six times greater than the effect of nutrients added to sediments (omega(2)=0.08). An increase in rate of deposition of sediments had substantial effects (omega(2)=0.35), which were about one third less than those of water-borne nutrients. Importantly, the combined effect of all three treatments caused a 77% increase in percentage cover of turf-forming algae, which is comparable to the observed difference in covers between urban and non-urban coast in South Australia (93%). These results suggest that human activities that reduce water quality in both nutrient and sediment loads account for major change observed on human-dominated coasts. Despite this knowledge, we still lack complete information on the mechanisms that switch the primary subtidal habitat from canopy-forming algae to turf-forming algae on human-dominated coasts.
机译：与南澳大利亚的非城市海岸相比，形成草皮的藻类在靠近城市的潮下带岩石上形成更广泛的栖息地。这种模式在世界温带沿海地区经常观察到，并被认为是城市沿海地区营养物浓度增加或沉积物沉积速率加快的结果。我们通过实验测试了环境变化的三个组成部分（水中养分增加，沉积物中养分增加和沉积物沉积增加）中的哪一个最能解释城市海岸上形成草皮藻类的广泛覆盖。这三种处理对草皮形成藻的覆盖率均具有独立的积极影响。从水柱中添加养分的影响最大（omega（2）= 0.55），这比添加到沉积物中的养分的影响（omega（2）= 0.08）大六倍以上。沉积物沉积速率的增加具有实质性影响（omega（2）= 0.35），这比水性养分的沉积物少约三分之一。重要的是，这三种处理的综合作用使草皮形成藻类的覆盖率增加了77％，这与南澳大利亚市区和非城市海岸覆盖率的观察到的差异相当（93％）。这些结果表明，人类活动降低了养分和沉积物中的水质，这是在以人为本的海岸上观测到的重大变化的原因。尽管掌握了这些知识，但我们仍然缺乏关于在人为主导的海岸上将主要潮下生境从冠层藻类转换为草皮藻类的机制的完整信息。

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