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The effect of disturbance and drought on Hairy Jointgrass (Arthraxon hispidus) in north coast New South Wales: Understanding threatened species populations in a dynamic landscape
Austral Ecology ( IF 1.6 ) Pub Date : 2021-03-05 , DOI: 10.1111/aec.13009 Laura White 1 , Claudia Catterall 1 , Kathryn Taffs 1
Austral Ecology ( IF 1.6 ) Pub Date : 2021-03-05 , DOI: 10.1111/aec.13009 Laura White 1 , Claudia Catterall 1 , Kathryn Taffs 1
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Ecological disturbances such as fire, grazing or mechanical cultivation can promote or suppress plant populations within vegetation communities. Therefore, such processes can threaten vulnerable species, or play a significant role in their conservation, so an understanding of a species’ ecological response to disturbance is foundational to threatened species management. Various types of anthropogenic disturbance are listed as threats to the vulnerable‐listed Arthraxon hispidus (Hairy Jointgrass) (Poaceae) in NSW; however, there is evidence that slashing, grazing and fire can stimulate the recruitment and establishment of this annual species in some circumstances. We undertook field experiments to investigate the effects of each of these disturbance regimes on A. hispidus populations over two growing seasons within modified wetlands/moist pastures in north coast NSW. We found that the application of fire in winter had a stronger promotional effect on A. hispidus recruitment than slashing, though both treatments increased its abundance and reduced the height and cover of surrounding vegetation, particularly exotic perennial grasses. Following initial establishment, A. hispidus declined under drought conditions during the study, and continuous grazing exacerbated this effect. Drought also increased the abundance of introduced species relative to native wetland species across the study sites. Results confirm that disturbance, particularly fire, can promote A. hispidus populations in some vegetation communities; however, climatic variation also plays a role in its population dynamics. Consideration of each of these factors and their potential interactions is important when developing conservation approaches for this threatened species.
中文翻译：
干扰和干旱对新南威尔士州北海岸毛茸茸的联合草（Arthraxon hispidus）的影响：了解动态景观中受威胁的物种种群
诸如火灾，放牧或机械耕种之类的生态干扰会促进或抑制植被群落中的植物种群。因此，此类过程可能威胁到易受害物种，或在其保护中发挥重要作用，因此，了解物种对干扰的生态反应是受威胁物种管理的基础。各种类型的人为干扰的被列为对脆弱上市的威胁荩hispidus（毛状Jointgrass）（禾本科）在新南威尔士州; 但是，有证据表明，在某些情况下，砍伐，放牧和生火可以刺激这种一年生物种的募集和建立。我们进行了野外实验，以研究每种干扰方式对A. hispidus的影响新南威尔士州北部海岸的改良湿地/湿地牧场中两个生长季节的种群数量。我们发现，冬季施火对鞭毛拟南芥的招募比砍伐具有更强的促进作用，尽管两种处理都增加了其丰度并降低了周围植被的高度和覆盖度，特别是异国多年生草。在最初建立之后，在研究过程中干旱条件下，组霉菌下降了，持续放牧加剧了这种影响。在整个研究地点，相对于本地湿地物种，干旱还增加了引入物种的数量。结果证实，干扰，尤其是火，可以促进A. hispidus一些植被社区的人口；然而，气候变化在其种群动态中也起作用。在为这一受威胁物种开发保护方法时，考虑这些因素及其潜在的相互作用非常重要。
更新日期：2021-03-05
中文翻译：
干扰和干旱对新南威尔士州北海岸毛茸茸的联合草（Arthraxon hispidus）的影响：了解动态景观中受威胁的物种种群
诸如火灾，放牧或机械耕种之类的生态干扰会促进或抑制植被群落中的植物种群。因此，此类过程可能威胁到易受害物种，或在其保护中发挥重要作用，因此，了解物种对干扰的生态反应是受威胁物种管理的基础。各种类型的人为干扰的被列为对脆弱上市的威胁荩hispidus（毛状Jointgrass）（禾本科）在新南威尔士州; 但是，有证据表明，在某些情况下，砍伐，放牧和生火可以刺激这种一年生物种的募集和建立。我们进行了野外实验，以研究每种干扰方式对A. hispidus的影响新南威尔士州北部海岸的改良湿地/湿地牧场中两个生长季节的种群数量。我们发现，冬季施火对鞭毛拟南芥的招募比砍伐具有更强的促进作用，尽管两种处理都增加了其丰度并降低了周围植被的高度和覆盖度，特别是异国多年生草。在最初建立之后，在研究过程中干旱条件下，组霉菌下降了，持续放牧加剧了这种影响。在整个研究地点，相对于本地湿地物种，干旱还增加了引入物种的数量。结果证实，干扰，尤其是火，可以促进A. hispidus一些植被社区的人口；然而，气候变化在其种群动态中也起作用。在为这一受威胁物种开发保护方法时，考虑这些因素及其潜在的相互作用非常重要。
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