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首页> 外文期刊>Estuarine Coastal and Shelf Science >Beach-cast deposition and commercial harvesting of a non-indigenous alga, Mazzaella japonica: Implications for macrofauna communities in Baynes Sound, British Columbia
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Beach-cast deposition and commercial harvesting of a non-indigenous alga, Mazzaella japonica: Implications for macrofauna communities in Baynes Sound, British Columbia

机译：非本地藻类Mazzaella japonica的滩涂沉积和商业化收获：对不列颠哥伦比亚省Baynes Sound大型动物群落的影响

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摘要

Accumulations of beach-cast seaweeds and other debris, collectively known as wrack, are a common and ecologically important occurrence along coastal regions worldwide. As the rate of seaweed introductions continues to increase, so too does their beach-cast collection for aesthetic or commercial purposes. The ecological effects of these harvests are poorly characterized in the literature, especially for nutrient-rich regions such as the Northeast Pacific. Within the southern extremity of Baynes Sound, British Columbia, beach wrack contains an introduced species of red alga called Mazzaelia japonica, which became the target of a commercial beach-cast harvest in 2007. The objectives of this research were threefold: 1) to quantify the contribution of M. japonica to wrack inputs within the harvest region; 2) to explore how wrack characteristics influence macrofauna communities; and 3) to determine if the commercial removal of beach-cast seaweeds has a detectable effect on wrack characteristics and macrofauna communities. To answer these questions we monitored a series of permanent transects at six sites across the harvest region from November 2014 until March 2015. We recorded as much as 853 kg (+/- 173 SD) of wrack per meter of shoreline, approximately 90% of which was M. japonica. Despite the removal of 675 tonnes of beach-cast seaweeds, we found that the trends in wrack biomass were similar between both harvested and unharvested locations. Macrofauna communities differed between study sites, as well as with the age class, and depth of the wrack from which they were sampled. These findings contribute to the limited literature on beach-cast seaweed harvesting and provide an important record of M. japonica wrack inputs for future research or monitoring of this non-indigenous seaweed.
机译：滩涂海藻和其他杂物的积累（统称为“残骸”）是全世界沿海地区常见且对生态重要的事件。随着海藻引进率的不断提高，出于美学或商业目的，他们的海滩铸造系列也不断增加。这些收成对生态的影响在文献中没有得到很好的描述，特别是对于营养丰富的地区，例如东北太平洋地区。在不列颠哥伦比亚省贝恩斯峡湾的南端，海滩残骸中含有一种引入的红藻，称为日本木Ma（Mazzaelia japonica），该藻成为2007年商业海滩铸造丰收的目标。该研究的目标有三点：1）量化粳稻对收获区域内失物投入的贡献； 2）探索残骸特征如何影响大型动物群落；和3）确定商业化清除滩涂海藻是否对残骸特征和大型动物群落具有可检测的影响。为了回答这些问题，我们从2014年11月至2015年3月在收割区的六个地点对一系列永久样带进行了监测。每米海岸线记录了多达853 kg（+/- 173 SD）的残骸，约占总残骸的90％是日本粳稻尽管清除了675吨的滩涂海藻，但我们发现，在收获地点和未收获地点，残骸生物量的趋势相似。大型动物群落在研究地点之间以及年龄级别和样本残骸深度方面都不同。这些发现为有关滩涂海藻收获的有限文献做出了贡献，并为今后研究或监测这种非本土海藻提供了粳稻残骸输入的重要记录。

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