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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Assemblage and understory carbon production of native and invasive canopy-forming macroalgae
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Assemblage and understory carbon production of native and invasive canopy-forming macroalgae

机译：天然和侵入性树冠形成大型藻类的组合和地下碳产量

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摘要

Carbon flow is essential to the function of all ecosystems, yet there is little mechanistic understanding of how non-indigenous macroalgae alter rates of carbon fixation in marine ecosystems. The spread of fast-growing non-indigenous species, such as the annual kelp Undaria pinnatifida (Harvey) Suringer, can potentially change trophic links through variable photosynthetic parameters relative to indigenous species. Here we use in situ photorespirometry to compare rates of net primary productivity (NPP) of assemblages dominated by U. pinnatifida and two native canopy-forming species, Cystophora torulosa and Durvillaea antarctica. The three assemblages had different light-use dynamics across a full light range, with the indigenous macroalgae showing no sign of saturated NPP at high irradiance, but with U. pinnatifida showing saturated NPP beyond 1000 mu mol m(-2) s(-1). Using incident irradiance collected over a full year, we show small differences in modeled average daily NPP during spring between U. pinnatifida assemblages (8 g C m(-2) day(-1)) and those dominated by C. torulosa (7 g C m(-2) day(-1)), whereas D. antarctica assemblages were the most productive (10 g C m(-2) day(-1)). The proportion of NPP provided by the sub-canopy component of assemblages varied between the canopy-forming species, where D. antarctica had a low sub-canopy contribution compared to stands dominated by U. pinnatifida or C torulosa. High biomass turnover associated with the annual life history of U. pinnatifida has the potential to increase carbon export to surrounding ecosystems compared to perennial fucoid species. Therefore, U. pinnatifida may have a positive effect on carbon flow, fixing similar quantities of carbon in a 6-month period as the native C torulosa in a year. It appears that U. pinnatifida has the potential to contribute a great deal of carbon and alter the biomass export regime as it spreads across shallow coastal habitats. (C) 2015 Elsevier B.V. All rights reserved.
机译：碳流量对于所有生态系统的功能都是必不可少的，但是对于非本地大型藻类如何改变海洋生态系统中碳固定率的机制知之甚少。快速生长的非本土物种（例如一年生海带Undaria pinnatifida（Harvey）Suringer）的扩散可能通过相对于本土物种的可变光合作用参数来改变营养联系。在这里，我们使用原位光呼吸测定法来比较以pinnatifida菌和两个原生树冠形成种（Cystophora torulosa和Durvillaea antarctica）为主的组合的净初级生产力（NPP）速率。这三种组合物在全光照范围内具有不同的光利用动力学，在高辐照度下，本地大型藻类没有显示出饱和NPP的迹象，而在纤毛虫中却显示出超过1000μmol m（-2）s（-1）的饱和NPP。 ）。使用全年收集的入射辐照度，我们显示出在春季春季平均每日NPP的微小平均数介于N.pinnatifida组合（8 g C m（-2）day（-1））和以C. torulosa为主的组合（7 g）之间。 C m（-2）day（-1）），而南极D.组合最有生产力（10 g C m（-2）day（-1））。在形成冠层的物种之间，南亚群的亚冠层组成所提供的NPP的比例各不相同，其中南极D.相比于美国裙带虫或to实C占主导地位的林分，南亚冠层的亚冠层贡献低。与多年生岩藻类物种相比，与pinnatifida的一年生史相关的高生物量周转率有可能增加向周围生态系统的碳出口。因此，pinnatifida可能会对碳流产生积极影响，在6个月内固定出与一年生的原生C. torulosa相似数量的碳。 pinnatifida似乎有潜力贡献大量的碳并改变生物量的输出方式，因为它遍布沿海浅生境。 （C）2015 Elsevier B.V.保留所有权利。

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