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首页> 外文期刊>Estuarine Coastal and Shelf Science >Biomass decay rates and tissue nutrient loss in bloom and non-bloom-forming macroalgal species
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Biomass decay rates and tissue nutrient loss in bloom and non-bloom-forming macroalgal species

机译：绽放和非绽放的大型藻类物种的生物量衰减率和组织养分流失

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Macroalgal blooms occur in shallow, low-wave energy environments and are generally dominated by fast-growing ephemeral macroalgae. When macroalgal mats undergo senescence and decompose they can cause oxygen depletion and release nutrients into the surrounding water. There are relatively few studies that examine macroalgal decomposition rates in areas impacted by macroalgal blooms. Understanding the rate of macroalgal bloom decomposition is essential to understanding the impacts of macroalgal blooms following senescence. Here, we examined the biomass, organic content, nitrogen decay rates and delta N-15 values for five macroalgal species (the bloom-forming Agardhiella subulata, Gracilaria vermiculophylla, Ulva compressa, and Ulva rigida and the non-bloom-forming Fucus vesiculosus) in Narragansett Bay, Rhode Island, U.S.A. using a litterbag design. Bloom-forming macroalgae had similar biomass decay rates (0.34-0.51 k d(-1)) and decayed significantly faster than non-bloom-forming macroalgae (0.09 k d(-1)). Biomass decay rates also varied temporally, with a significant positive correlation between biomass decay rate and water temperature for U. rigida. Tissue organic content decreased over time in all species, although A. subulata and G. vermiculophylla displayed significantly higher rates of organic content decay than U. compressa, U. rigida, and F. vesiculosus. Agardhiella subulata had a significantly higher rate of tissue nitrogen decay (0.35k d(-1)) than all other species. By contrast, only the delta N-15 of F. vesiculosus changed significantly over the decay period. Overall, our results indicate that bloom forming macroalgal species decay more rapidly than non-bloom-forming species. (C) 2016 Elsevier Ltd. All rights reserved.
机译：大型藻华发生在浅层，低波能量环境中，并且通常以快速生长的临时大型藻类为主。当大型藻类席子衰老并分解时，它们会导致氧气消耗，并向周围的水中释放养分。在受大型藻华影响的地区，研究大型藻分解速率的研究相对较少。了解大型藻类花朵分解的速率对于了解衰老后大型藻类花朵的影响至关重要。在这里，我们检查了五个大型藻类物种的生物量，有机物含量，氮衰减速率和N-15增量值（形成水华的Agardhiella subulata，Gracilaria vermiculophylla，Ulva compressa，Ulva compressa和非水华的Fusus vesiculosus）在美国罗得岛纳拉甘西特湾使用垃圾袋设计。形成大花的大型藻类具有相似的生物量衰减率（0.34-0.51 k d（-1）），并且其衰减速度明显快于非形成大花的藻类（0.09 k d（-1））。生物量的衰减率也随时间变化，而僵硬U.的生物量衰减率与水温之间具有显着的正相关。在所有物种中，组织中的有机物含量均随时间下降，尽管A. subulata和G. vermiculophylla的有机物含量衰减率明显高于U. compressa，U。僵硬和F. vesiculosus。百日草（Agardhiella subulata）具有比所有其他物种显着更高的组织氮衰减率（0.35k d（-1））。相比之下，在衰落期中，仅维氏梭菌的δN-15发生了显着变化。总体而言，我们的结果表明，形成花序的大型藻类物种的衰变比不形成花序的物种更快。 （C）2016 Elsevier Ltd.保留所有权利。

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