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首页> 外文期刊>Estuarine Coastal and Shelf Science >Abiotic characteristics and microalgal dynamics in South Africa's largest estuarine lake during a wet to dry transitional phase
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Abiotic characteristics and microalgal dynamics in South Africa's largest estuarine lake during a wet to dry transitional phase

机译：南非最大的河口湖从湿到干过渡期的非生物特征和微藻动态

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摘要

The summer of 2012/2013 signified the end of the dry phase in the St Lucia estuarine system that lasted for over a decade. The increased rainfall coupled with the partial re-connection of the Mfolozi River to the estuarine system shifted St Lucia to a new limnetic state. With the increased availability of habitat due to the higher water level, it was expected that microalgal biomass and abundance would rapidly increase through recruitment from refuge areas i.e. South Lake and new introductions. Microalgal and physico-chemical data were collected at three sites within the Mfolozi/Msunduzi River and at 23 sites within the St Lucia estuarine system between June 2014 and February 2015. Results from this study indicated low biomass for both phytoplankton (<5 1.1g l(-1)) and microphytobenthos (<60 mg m-2) because of local and external drivers. These included limited nutrient and light availability, variable water residence times, biomass dilution and heterogeneity of the sediment. The high spatio-temporal variability limits the effectiveness of using the microalgal communities to detect change in the estuarine lake. In addition, significant intrasystem differences were observed between the three main lake basins and Narrows, due to the influence of the freshwater input from the Mfolozi River. This study provides insight into the spatio-temporal variability of physico-chemical conditions and microalgal communities during the 2014-2015 limnetic state. (C) 2017 Elsevier Ltd. All rights reserved.
机译：2012/2013年夏天标志着圣卢西亚河口系统持续了十多年的干旱期结束。降雨增加，加上Mfolozi河与河口系统的部分重新连接，使圣卢西亚（St Lucia）进入了新的边缘状态。随着水位的升高，随着生境的可利用性的增加，人们预计，通过从南湖等避难区招募和引进新的微藻，生物藻类的生物量和丰度将迅速增加。在2014年6月至2015年2月期间，在Mfolozi / Msunduzi河内的三个地点和St Lucia河口系统内的23个地点收集了微藻和理化数据。这项研究的结果表明，浮游植物的生物量均较低（<5 1.1gl（ -1））和微型底栖动物（<60 mg m-2），这是由于局部和外部驱动因素引起的。其中包括有限的养分和光的利用，可变的水停留时间，生物量稀释和沉积物的非均质性。高的时空变异性限制了使用微藻类群落检测河口湖变化的有效性。此外，由于Mfolozi河的淡水输入的影响，在三个主要湖盆和Narrows之间观察到明显的系统内部差异。这项研究提供了对2014-2015年高铁状态下理化条件和微藻群落的时空变化的见解。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2017年第ptaa期|236-248|共13页
  • 作者

    Nunes Monique; Adams Janine B.; Bate Guy C.; Bornman Thomas G.;

  • 作者单位

    Nelson Mandela Univ, Inst Coastal & Marine Res, Bot Dept, POB 77000, ZA-6301 Port Elizabeth, South Africa;

    Nelson Mandela Univ, Inst Coastal & Marine Res, Bot Dept, POB 77000, ZA-6301 Port Elizabeth, South Africa;

    Nelson Mandela Univ, Inst Coastal & Marine Res, Bot Dept, POB 77000, ZA-6301 Port Elizabeth, South Africa;

    Nelson Mandela Univ, Inst Coastal & Marine Res, Bot Dept, POB 77000, ZA-6301 Port Elizabeth, South Africa|South African Environm Observat Network, ZA-6031 Port Elizabeth, South Africa;

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  • 正文语种 eng
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  • 关键词

    Freshwater inflow; Nutrient enrichment; Phytoplankton; Microphytobenthos; Mfolozi river;

    机译：淡水流入;营养富集;浮游植物;微型底栖动物;Mfolozi河;

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