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Multi-decadal decline in cover of giant kelp forests (Macrocystis pyrifera) at the southern limit of its Australian range
Marine Ecology Progress Series ( IF 2.2 ) Pub Date : 2020-10-29 , DOI: 10.3354/meps13510
CL Butler 1 , VL Lucieer 1 , SJ Wotherspoon 1 , CR Johnson 1
Affiliation  

ABSTRACT: Knowledge of long-term and multi-scale trends in ecological systems is a vital component in understanding their dynamics. We used Landsat satellite imagery to develop the first long-term (1986-2015) data set describing the cover of dense surface canopies of giant kelp Macrocystis pyrifera around the entire coastline of Tasmania, Australia, and assessed the extent to which potential environmental drivers explain the dynamics of surface canopies at multiple spatial and temporal scales. Broad-scale temporal patterns in canopy cover are correlated with El Nino-Southern Oscillation events, while regional patterns are related to sea surface temperature and nutrient regimes are associated with the East Australian Current. Regression models developed to predict the presence or absence of giant kelp canopy emphasise the importance of sea surface temperature in these systems. Long-term decline in canopy cover is clearly evident in most regions, and in light of increasing thermal stress associated with a changing ocean climate, this raises concern for the future of this species as a major habitat-forming kelp in Australia and some other regions worldwide. Given that Tasmania represents the stronghold of the range of this species in Australia, but is a geographic trap in that there is no suitable habitat for M. pyrifera to the south, our findings support the Federal listing of giant kelp communities in Australia as an endangered marine community type.

中文翻译:

澳大利亚分布区南端巨型海带森林(Macrocystis pyrifera)的覆盖率连续数十年下降

摘要:了解生态系统的长期和多尺度趋势是了解其动态的重要组成部分。我们使用 Landsat 卫星图像开发了第一个长期(1986-2015)数据集,描述了澳大利亚塔斯马尼亚州整个海岸线周围巨型海带 Macrocystis pyrifera 密集地表冠层的覆盖,并评估了潜在环境驱动因素的解释程度多个空间和时间尺度的表面冠层动态。冠层覆盖的大尺度时间模式与厄尔尼诺-南方涛动事件相关,而区域模式与海面温度相关,营养状况与东澳大利亚洋流相关。为预测巨型海带冠层是否存在而开发的回归模型强调了海面温度在这些系统中的重要性。在大多数地区,冠层覆盖的长期下降是显而易见的,鉴于与海洋气候变化相关的热应力不断增加,这引起了对该物种作为澳大利亚和其他一些地区主要栖息地形成海带的未来的担忧全世界。鉴于塔斯马尼亚是澳大利亚该物种分布范围的据点,但由于南部没有适合 M. pyrifera 栖息地,因此它是一个地理陷阱,我们的研究结果支持联邦将澳大利亚巨型海带群落列为濒危物种海洋群落类型。鉴于与海洋气候变化相关的热应力不断增加,这引起了人们对该物种作为澳大利亚和世界其他一些地区的主要栖息地形成海带的未来的担忧。鉴于塔斯马尼亚是澳大利亚该物种分布范围的据点,但由于南部没有适合 M. pyrifera 栖息地,因此它是一个地理陷阱,我们的研究结果支持联邦将澳大利亚巨型海带群落列为濒危物种海洋群落类型。鉴于与海洋气候变化相关的热应力不断增加,这引起了人们对该物种作为澳大利亚和世界其他一些地区的主要栖息地形成海带的未来的担忧。鉴于塔斯马尼亚是澳大利亚该物种分布范围的据点,但由于南部没有适合 M. pyrifera 栖息地,因此它是一个地理陷阱,我们的研究结果支持联邦将澳大利亚巨型海带群落列为濒危物种海洋群落类型。
更新日期:2020-10-29
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