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首页> 外文期刊>Marine ecology progress series >Wasted effort: recruitment and persistence of kelp on algal turf
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Wasted effort: recruitment and persistence of kelp on algal turf

机译：浪费精力：海藻在海藻草皮上的吸收和持久性

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摘要

Declines in kelp abundance over the past 3 decades have resulted in a shift from luxuriant kelp beds to extensive mats of turf-forming algae in Nova Scotia, Canada. With the reduced availability of open rocky substrate, kelps are increasingly recruiting to turf algae. At 3 sites near Halifax, we found that turf-attached kelp Saccharina latissima was generally restricted to smaller size classes (50 cm length) than rock-attached kelp at 12 m depth. Turf-attached kelp allocated a greater proportion of biomass to the holdfast (anchoring structure), which differed morphologically from that of rock-attached kelp and had lower attachment strength. To assess how these differences affect survival, we monitored kelp in 2 m diameter plots at 11 m depth over 40 wk at 1 site. Smaller kelps were predominantly turf-attached and larger ones rock-attached in late summer and autumn, but there was near-complete loss of both turf-and rock-attached kelp over winter when wave action was greatest. In a concurrent manipulative experiment at 5 m depth at another site, we transplanted small boulders with turf-or rock-attached kelp to a wave-exposed or protected location. Survival was greater for rock-attached transplants at both locations after 12 wk, with a complete loss of turf-attached kelp in the wave-exposed treatment. Classification based on holdfast morphology showed that 76% of drift kelp within a depositional area at this site was once turf-attached. Low survival of kelps that recruit to turf algae, likely due to wave dislodgement, may represent an important feedback that increases resilience of a turf-dominated state and prevents reestablishment of kelp.
机译：在过去的30年中，海带丰度的下降导致了加拿大新斯科舍省从繁茂的海带床转变为广泛的草皮形成藻垫。由于开放的岩石底物的可用性降低，海带越来越多地被草皮藻吸收。在哈利法克斯（Halifax）附近的3个地点，我们发现，与草皮相连的海带相比，在12 m深度处，附有草皮的海带Saccharina latissima通常被限制在较小的尺寸级别（<50 cm长）上。附有草皮的海带将更大比例的生物质分配给固定物（锚固结构），形态上与附有岩石的海带不同，且附接强度较低。为了评估这些差异如何影响生存，我们在1个站点的40 wk上的11 m深度的2 m直径样地中监测了海带。夏末和秋末，较小的海带主要是附有草皮的，而较大的则是附有岩石的，但是当波浪作用最大时，整个冬季，草坪和附有岩石的海带几乎完全消失。在另一个站点进行的5 m深度的并行操作实验中，我们将装有草皮或附有岩石的海带的小巨石移植到了波浪暴露或受保护的位置。 12周后，在两个位置的附着石的移植物的存活率都更高，在波浪暴露的处理中，完全失去了附着有草皮的海带。基于保持形态的分类显示，该地点沉积区域内76％的漂移海带曾经被草坪附着。可能由于波浪移位而招募到草皮藻类的海带存活率低，可能代表重要的反馈，增加了草皮主导状态的适应力并阻止了海带的重新形成。

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