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Seaweed farming pressure affects seagrass and benthic macroalgae dynamics in Chwaka Bay (Zanzibar, Tanzania)
Regional Environmental Change ( IF 4.2 ) Pub Date : 2021-01-14 , DOI: 10.1007/s10113-020-01742-2
Agustín Moreira-Saporiti , Dieuwke Hoeijmakers , Flower E. Msuya , Hauke Reuter , Mirta Teichberg

Farming of Eucheuma denticulatum is a major activity in Zanzibar affecting seagrass ecosystems primarily through shading and trampling. The aim of this study was to test the impacts of shading and trampling during seaweed farming on seagrass meadows composed by Halophila stipulacea and Thalassia hemprichii and their associated benthic macroalgae. Areas covered by these species were selected for the building of seaweed farms in three treatments: seaweed farm plots (with shading and trampling effects), trampling plots (with trampling effects only), and control plots (with no shading or trampling effects). Reduction of light within the plots was recorded over 9 weeks. Percentage cover of seagrasses and macroalgae and shoot density of seagrasses were measured over 12 weeks to assess the impact of shading and trampling by seaweed farming activities. Light was significantly reduced in the seaweed farm plots by 75 to 90% by the end of a seaweed growth cycle. H. stipulacea, despite its capacity for rapid growth, was significantly affected by the combination of shading and trampling under the seaweed farm treatment, while the climax seagrass species T. hemprichii was unaffected. Due to the decline in H. stipulacea, benthic macroalgae cover increased in the seaweed farm treatment, suggesting a change in seagrass community dynamics. In contrast, trampling had a negative effect on the benthic macroalgae as an isolated disturbance, which suggests that seagrasses are more resistant to trampling than macroalgae and would likely dominate the benthic macrophyte community under these conditions.



中文翻译:

海藻养殖压力影响Chwaka湾(坦桑尼亚桑给巴尔)的海草和底栖大型藻类动态

Eucheuma denticulatum的养殖是桑给巴尔的一项主要活动,主要通过遮荫和践踏来影响海草生态系统。这项研究的目的是测试海藻养殖期间遮荫和践踏对由拟南芥拟南芥组成的海草草甸的影响及其相关的底栖大型藻类。选择了这些物种所覆盖的区域,以三种方式建造海藻农场:海藻农场地块(具有阴影和践踏效果),践踏地块(仅具有踩踏效果)和对照地块(没有阴影或踩踏效果)。在9周内记录了小区内光的减少。在12周内测量了海草和大型藻类的覆盖率以及海草的芽密度,以评估海藻养殖活动对遮阳和践踏的影响。到海藻生长周期结束时,海藻农场地的光显着减少了75%至90%。H. stipulacea尽管其具有快速生长的能力,但在海藻养殖场的处理下,遮荫和践踏相结合却受到显着影响,而高潮海草物种T. hemprichii则不受影响。由于的减少,海藻养殖场的底栖大型藻类覆盖率增加,表明海草群落动态发生了变化。相比之下,践踏对底栖大型藻类有负面影响,是一个孤立的干扰,这表明海草比践踏藻类对底栖大型藻类的抵抗力更强,并且可能在这些条件下主导底栖大型植物群落。

更新日期:2021-01-14
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