首页> 美国政府科技报告 >Delayed Recovery of Seagrass Beds Along Navigable Waterways: Interaction BetweenDisturbance and Nuisance Algae
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Delayed Recovery of Seagrass Beds Along Navigable Waterways: Interaction BetweenDisturbance and Nuisance Algae

机译:沿着通航水道延迟恢复海草床:扰动和滋扰藻类之间的相互作用

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In coastal systems, patches of seagrass are frequently destroyed by propellerscarring and anchor damage near waterways, resulting in denuded 'blowouts'. The author proposed that (1) benthic 'drift' algae (marine analogs of terrestrial tumbleweeds) settle in blowouts and protract recovery of seagrass by shading the affected patches, and (2) that algal masses may be more easily trapped in small blowouts than in large blowouts. He tested this hypothesis with a series of field manipulations. Algal cover was much higher on disturbed plots than on controls, and there was also greater algal accumulation associated with small disturbances than with larger gaps. Algal accumulation slowed recovery of seagrasses as gauged by seagrass cover and density of seagrass shoots but caused little effect on recovery rates for standing crop, leaf area index, or canopy height. A greater intensity of disturbance fell upon the smaller plots, but recovery on these gaps was equal to or greater than exhibited by the large gaps, probably due to the small amount of vegetative recovery required to seal small gaps.

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