Life history flexibility allows Sargassum polyceratium to persist in different environments subjected to stochastic disturbance events

详细信息    查看全文

• 作者：Aschwin H. Engelen ; Anneke M. Breeman ; Jeanine L. Olsen ; Wytze T. Stam and Per ?berg
• 关键词：Sargassum polyceratium ; Stochastic matrix model ; Life history strategy ; Wave ; disturbance events ; Depth
• 刊名：Coral Reefs
• 出版年：2005
• 出版时间：December 2005
• 年：2005
• 卷：24
• 期：4
• 页码：670-680
• 全文大小：469 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Oceanography
  Geology
  Sedimentology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0975

文摘

Stochastic, stage-based matrix models were used to investigate the life history strategy of the seaweed Sargassum polyceratium in shallow intertidal and deep-water (18 m) populations. Matrix models were parameterized with 3 years of yearly transitions among four plant stages quantified from three bays on Cura?ao (Netherlands Antilles). There were years without a storm, with a moderate (winter) storm and with a strong storm (Hurricane Lenny). The stochastic population growth rate varied among populations (λ_s: 0.54–1.03) but was not related to depth. The most important stages for population growth were reproductive adults (shallow) and non-reproductive adults (deep). With the occurrence of storms, vegetative growth (mainly deep) and fertility (mainly shallow) became the most important processes. Recruitment (shallow) and regeneration from holdfasts (deep) only contributed to population persistence after the hurricane. It is concluded that S. polyceratium has a flexible, depth-dependent, life history strategy that is adjusted to disturbance events.