Field biology of Halimeda tuna (Bryopsidales, Chlorophyta) across a depth gradient: comparative growth, survivorship, recruitment, and reproduction
Field biology of Halimeda tuna (Bryopsidales, Chlorophyta) across a depth gradient: comparative growth, survivorship, recruitment, and reproduction
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哈利米达金枪鱼（苔藓目、绿藻门）跨深度梯度的野外生物学：比较生长、存活、补充和繁殖
作者：
P. Vroom;Celia M. Smith;J. Coyer;L. Walters;C. Hunter;K. Beach;J. Smith
在海螺礁的浅背礁（4- 7 m）和深礁坡（15-22 m）对佛罗里达礁群中占优势的绿色金枪鱼（Halimeda tuna）的生长、存活、补充和繁殖进行了监测。尽管较低的光照强度和类似的放牧压力，片足类动物的侵扰，和真菌负载在这两个网站，较深的网站表现出显着较高的增长率在夏季的几个月超过4年的时间比发现的浅的人口，可能是因为更高的营养水平在深度和浅植物的光抑制。整个珊瑚礁的有性生殖事件同时发生，在两个网站的人口发展配子囊的5%。新的直立轴由合子，无性分裂，或营养的赛跑者形成。植物似乎有持久的基础树桩生存恶劣的环境条件下，即使直立，光合轴被删除。有性生殖和真菌过度生长的“窒息”被假设为个体死亡的两个原因。
Growth, survivorship, recruitment, and reproduction of Halimeda tuna, a dominant green alga in many reef systems of the Florida Keys, were monitored at a shallow back reef (4–7m) and deep reef slope (15–22 m) on Conch Reef. Despite lower light intensities and similar grazing pressures, amphipod infestations, and epiphyte loads at both sites, the deeper site exhibited significantly higher growth rates in summer months over a 4-year period than found for the shallow population, possibly because of higher nutrient levels at depth and photoinhibition of shallow plants. Sexual reproductive events occurred simultaneously across the entire reef, with up to 5% of the population at both sites developing gametangia. New upright axes formed from zygotes, asexual fragmentation, or vegetative runners. Plants appear to have persistent basal stumps that survive harsh environmental conditions, even if upright, photosynthetic axes are removed. Sexual reproduction and ‘smothering’ by epiphyte overgrowth are hypothesized to be two causes of death for individuals.