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首页> 外文期刊>Memoirs of the Queensland Museum >Long-term changes in aquatic vegetation associatedwith structural modification and altered hydrology ina subtropical east Australian estuary
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Long-term changes in aquatic vegetation associatedwith structural modification and altered hydrology ina subtropical east Australian estuary

机译：亚热带东澳大利亚河口水生植被的长期变化及其结构改变和水文变化

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A Zostera capricorni community is formally recorded for the first time in Currumbin Creekon the subtropical east Australian coast. The seagrass community extends approx. 2 kmalong both sides of the creek just below low tide mark, growing either in patches ofvariable size or more commonly as broad bands up to 5 m in breadth. The communityconsists of dense subtidal Zostera capricorni plants growing with subtidal Halophilaovalis. Leaves of Zostera capricorni were typically up to 70 cm long, considerably longerthan previously reported for the large growth form of the species. Biological surveysundertaken over the last two decades had reported seagrasses as absent fromCurrumbin Creek. However, a forgotten consultancy report documented the loss of asmall Zostera capricorni community in the creek following large-scale dredging of theinternal delta in 1974. It is unlikely that seagrasses would have recolonised CurrumbinCreek until after the cessation of sand dredging in 1992. Recent extension of theseagrass community much further upstream than previously reported is consistent withthe change to marine conditions following training wall construction in 1973 whichmaintains the creek mouth permanently open to the sea. Previously, lower CurrumbinCreek had oscillated between a prolonged freshwater phase when accumulated sandisolated the creek from the sea and a shorter marine phase that followed episodic highrunoff events when the flooded creek cut a new entrance to the sea. Lessening of thefreshwater influence has produced environmental conditions more conducive toseagrass growth and has also led to the replacement of freshwater riparian vegetationwith mangroves. Seagrasses are a valuable resource in coastal marine ecosystems and itis essential to develop management strategies to ensure the survival of the CurrumbinCreek seagrass community.
机译：在亚热带东澳大利亚海岸的库伦宾溪（Currumbin Creek）中，第一次正式记录了Zostera capricorni社区。海草社区延伸约。小溪两边的2公里处正好位于低潮标记以下，生长在大小不等的斑块中，或更常见的是宽达5 m的宽带。该群落由潮下带嗜盐藻生长的致密潮下带状带菌Zostera capricorni植物组成。 Zostera capricorni的叶子通常长达70厘米长，比以前报道的该物种大生长形式的叶子长得多。在过去的二十年中进行的生物学调查显示，Currumbin Creek没有海草。但是，一份被遗忘的咨询报告记录了在1974年对内部三角洲进行大规模疏following之后，小河中的一个小Zostera capricorni社区的损失。直到1992年停止挖沙之后，海草才可能重新定居CurrumbinCreek。这些杂草丛生的上游比以前报道的要远得多，这与1973年训练墙建造后海洋状况的变化相一致，这使得小河口永久向海开放。以前，较低的Currumbinbin Creek在积累的沙子使小河与海洋隔离时，在延长的淡水阶段和较短的海洋阶段之间进行了振荡，随后洪水泛滥，小溪切割了新的海洋入口，随后发生了短暂的高径流事件。淡水影响的减轻产生了更有利于海草生长的环境条件，也导致了用红树林代替淡水河岸植被。海草是沿海海洋生态系统中的宝贵资源，对制定管理策略以确保CurrumbinCreek海草群落的生存至关重要。

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