您的账号已在其他设备登录,您当前账号已强迫下线,
如非您本人操作,建议您在会员中心进行密码修改

确定

Zooxanthellae population density and physiological state of the coral stylophora pistillata during starvation and osmotic shock

摘要:

Regulation of symbiotic zooxanthellae populations in hermatypic corals may include growth limitation by the host, release of healthy-looking zooxanthellae, and degradation of zooxanthellae. Here we experimentally change the zooxanthellae densities in branches of Stylophora pistillata corals through starvation and osmotic shock. We follow the subsequent changes of the zooxanthellae population dynamics. Prolonged starvation (40 days) caused a 50% loss of zooxanthellae, a 70% decrease in photo synthesis (P calculated per polyp), a 3-fold decrease in proliferating zooxanthellae frequency (PZF) and two-three-fold increase in degrading zooxanthellae frequency (DZF). The increase of the numbers of zooxanthellae in various stages of degradation was closely coupled to an increase in the release of degraded zooxanthellae particles (dzp). At the same time, zooxanthellae volume increased by 80% but chlorophyll content and the photosynthetic capacity of the zooxanthellae did not change. Polyps subjected to osmotic shock (17%o) expelled about one third of their zooxanthellae along with elements of animal cells. PZF and DZF levels varied slightly. We assume that zooxanthellae densities in corals are a consequence of differential rates of zooxanthellae division and degradation regulated by the coral host. Only under extreme conditions are zooxanthellae population densities regulated by expulsion of healthy zooxanthellae.

更多
作者单位: Sesoko Station, Tropical Biosphere Research Centre, University of the Ryukyus, Sesoko 3422, Motobu-cho, Okinawa 905-02, Japan and Institute of Marine Biology, Far East Branch of Russian Academy of Sciences, Vladivostok, 690041, Russia [1] Department of Biology, Faculty of Science, Kagoshima University, kagoshima 890, Japan [2] Department of Marine Sciences, University of the Ryukyus, Senbaru 1, Nishihara, Okinawa 903-0213, Japan [3] and [4] Kansas State University Agricultural Research Center 1232 240~th Avenue Hays, Kansas 67601 USA [5]
期刊:
发布时间: 2013-01-01
翻译满意度评价:
提交
  • 浏览:51

相似文献

  • 中文期刊
  • 外文期刊
  • 学位论文
  • 会议论文

加载中!

加载中!

加载中!

加载中!