...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Population biology of the intertidal kelp, Alaria marginata Postels and Ruprecht: A non-fugitive annual
【24h】

Population biology of the intertidal kelp, Alaria marginata Postels and Ruprecht: A non-fugitive annual

机译：潮间带海带，Alaria marginata Postels和Ruprecht的种群生物学：非消亡的年度

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Persistence of annual plant populations requires sufficient seeds and suitable habitat for development and growth each year. Competition with perennials may prevent within site persistence and result in "fugitive" annual populations. Comparisons have been made between the population biology of annual macroalgae and terrestrial plants, but demographic information necessary to make strong comparisons is lacking for most of these algae, and life history differences may make such comparisons questionable. We studied population dynamics of the kelp Alaria marginata to determine if it was an annual and, if so, how populations persisted. This kelp is the dominant macroalga on exposed mid to low rocky intertidal shores along the Big Sur coast of California. Experimental clearings at two sites were used to assess recruitment timing and survivorship. Sporophytes were collected monthly to determine growth and fecundity. Recruitment occurred in late winter to early spring, primarily on geniculate corallines and residual A. marginata holdfasts. Thinning was inversely related to density, and occurred during the February through July growing season as larger thalli rapidly increased in length (up to 1.4 m month~(-1)) and formed a thick canopy. Sorus development was positively related to size, began as early as March, peaked in late August-October, and decreased as adults were removed by winter surf. Spore release was generally highest (10~8-10~9 spores individual~(-1) 1 h~(-1)) between October and January and associated with high water motion. Survivorship of sporophytes beyond one year was < 1%, showing the populations were annual. Field observations and experiments on effects of canopy clearing, season of clearing, and influence of substrate type on recruitment were done to assess how these annual populations persist. Massive spore production at the onset of fall storms, survival of microscopic stages for 3-4 months facilitated by microhabitat refuges, rapid growth, large size and rapid maturation of sporophytes contributed to persistence. Furthermore, the dense stands with thick canopies may suppress potential competitors via shading and abrasion. Rather than being a fugitive, this combination of growth and life history features enables A. marginata and perhaps other large, annual kelps to maintain perennial populations.
机译：一年生植物种群的持久性每年需要足够的种子和合适的栖息地以进行生长和生长。与多年生植物的竞争可能会阻止场地内的持久性，并导致“逃亡”的年度种群。已经对一年生大型藻类和陆生植物的种群生物学进行了比较，但是对于大多数此类藻类而言，缺乏进行强有力的比较所需的人口统计学信息，而且生活史的差异可能使这种比较值得怀疑。我们研究了海带Alaria marginata的种群动态，以确定它是否为年度种群，如果是一年的话，则如何持续种群。海带是加利福尼亚州大苏尔沿岸中低岩石潮间带裸露海岸上的主要巨藻。在两个地点的实验性空地被用来评估招募时间和幸存者。每月收集孢子体以确定生长和繁殖力。招募发生在冬季末至初春，主要发生在膝状珊瑚线和残留的A.marginata固着物上。稀疏与密度成反比，发生在2月至7月的生长季节，随着较大的塔利长度迅速增加（最大至1.4 m month〜（-1））并形成厚冠层。索罗斯的发育与大小呈正相关，最早于3月开始，在8月下旬至10月达到顶峰，随着成年人被冬季冲浪赶走而下降。十月至一月间，孢子释放通常最高（10〜8-10〜9个孢子〜（-1）1 h〜（-1）），且与高水分运动有关。一年以上的孢子体存活率小于1％，表明该种群为每年。进行了有关冠层清除，清除季节和基质类型对募集的影响的实地观察和实验，以评估这些年度种群如何持续存在。秋季暴风雨开始时大量孢子产生，微观栖息地的庇护促进了微观阶段3-4个月的生存，孢子体的快速生长，大尺寸和快速成熟有助于持久性。此外，茂密的林冠带有浓密的树冠可能会通过阴影和磨蚀抑制潜在的竞争者。这种成长和生活史特征的结合，而不是逃亡，使边缘曲霉和其他大型的一年生海藻能够维持多年生种群。

著录项

相似文献

  • 外文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号