Do Macroalgal Mats Impact Microphytobenthos on Mudflats? Evidence from a Meta-Analysis, Comparative Survey, and Large-Scale Manipulation
Do Macroalgal Mats Impact Microphytobenthos on Mudflats? Evidence from a Meta-Analysis, Comparative Survey, and Large-Scale Manipulation
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巨藻垫会影响泥滩上的微型底栖植物吗？
DOI：
10.1007/s12237-018-0418-3
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发表时间：
2018
影响因子：
2.7
通讯作者：
M. Pace
中科院分区：
文献类型：
--
作者：
A. Besterman;M. Pace
富营养化和物种引进导致地球仪沿海生态系统中大型藻类生物量增加。大型藻类垫可能与微型底栖植物竞争光照和营养，由于它们在树冠中的位置，对微型底栖植物生物量产生负面影响。我们测试了这种效果进行荟萃分析以前的实验，以及比较调查，并在弗吉尼亚州海岸保护区（VCR）的东部海岸海岸的弗吉尼亚州（美国）的沿海泻湖的大型藻类去除操作。在所有情况下，MPB生物量估计使用底栖叶绿素作为替代。虽然先前的个别研究记录了大型藻类的影响，但当对各项研究的效应大小进行平均时，大型藻类生物量对MPB生物量没有一致的影响。在VCR，一个非本地的红色macrophages，江蓠，占主导地位的潮间带垫，并达到高生物量在某些网站。然而，MPB生物量是无关的大型藻类质量的基础上调查泥滩。此外，当大型藻类实验操作的泥滩使用之前和之后的影响设计，有MPB没有变化。基于我们进行的荟萃分析，调查和操作，大型藻垫没有一个概括的影响MPB，相互作用似乎上下文相关，并在VCR中，MPB的影响出现中性。这一发现是重要的MPB在支持食物网和其他河口生态系统功能的意义，以及日益增加的频率和强度的大型藻类水华。
Eutrophication and species introductions have resulted in increased macroalgal biomass in coastal ecosystems around the globe. Macroalgal mats may compete with microphytobenthos (MPB) for light and nutrients and, due to their position in the canopy, have a negative impact on MPB biomass. We tested this effect by conducting a meta-analysis of prior experiments, as well as a comparative survey, and a macroalgal-removal manipulation in the coastal lagoons of the Virginia Coastal Reserve (VCR) on the eastern shore of Virginia (USA). In all cases, MPB biomass was estimated using benthic chlorophyll as a proxy. While prior individual studies documented impacts of macroalgae, when effect sizes were averaged across studies, there was no consistent effect of macroalgal biomass on MPB biomass. In the VCR, a non-native red macroalga, Gracilaria vermiculophylla, dominates intertidal mats and attains high biomasses at some sites. Nevertheless, MPB biomass was unrelated to macroalgal mass based on a survey of mudflats. Further, when macroalgae were experimentally manipulated on a mudflat using a before and after impact design, there was no change in MPB. Based on the meta-analysis, survey, and manipulation we conducted, macroalgal mats do not have a generalizable effect on MPB, interactions seem context-dependent, and in the VCR, the effects on MPB appear neutral. This finding is important given the significance of MPB in supporting food webs and other estuarine ecosystem functions, as well as the increasing frequency and intensity of macroalgal blooms.