Spatial and Seasonal Variations in the Biological Characteristics of Two Invasive Brown Algae, Turbinaria ornata (Turner) J. Agardh and Sargassum mangarevense (Grunow) Setchell (Sargassaceae, Fucales) Spreading on the Reefs of Tahiti (French Polynesia)
Spatial and Seasonal Variations in the Biological Characteristics of Two Invasive Brown Algae, Turbinaria ornata (Turner) J. Agardh and Sargassum mangarevense (Grunow) Setchell (Sargassaceae, Fucales) Spreading on the Reefs of Tahiti (French Polynesia)
复制标题
塔希提岛（法属波利尼西亚）珊瑚礁上传播的两种入侵褐藻：Turbinaria ornata (Turner) J. Agardh 和马尾藻 (Grunow) Setchell（马尾藻科、墨角藻目）生物特征的空间和季节变化
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
C. Payri
中科院分区：
文献类型：
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作者：
V. Stiger;C. Payri
摘要在法属波利尼西亚的塔希提岛和其他高地岛礁上，分布广泛、种群密度高的红腹藻和马尾藻是最引人注目的生物。这项研究报告了这两个物种所表现出的时间和空间格局的定量研究。调查是在塔希提岛的三个不同地点进行的。从1994年11月至1996年2月，在16个月的时间里收集了有关成熟种群的密度、成熟度、大小结构、性别分布和生育力的数据。红尾藻和马尾藻种群一年四季都栖息在珊瑚礁上，在凉爽的季节密度达到高峰。从边缘生物礁到外部生物脊的密度梯度很明显。成熟度和育性高峰出现在暖季。在外生源脊上观察到叶状体长度的矮化现象，而在马尾藻中没有观察到。在物理和化学上不稳定的两个区域--边缘礁和外生生脊上，这两个物种的种群都表现出较高的有性繁殖能力，而在内堡礁上的种群数量较低。无论该地区如何考虑，这两个物种的繁殖期贯穿全年。在这项研究中收集的数据被用来解释这两个物种对不同栖息地的殖民。
Abstract In terms of widespread distribution and high population density Turbinaria ornata and Sargassum mangarevense are the most conspicuous organisms settled on the reefs in Tahiti and other high islands of French Polynesia. This study reports on quantitative investigations of the temporal and spatial patterns displayed by these two species. It was carried out at three different sites on Tahiti Island. Data dealing with density, maturity, size structure of the mature population, sex-distribution and fertility were collected over 16 months between November 1994 and February 1996. Turbinaria ornata and Sargassum mangarevense populations settle on the reef throughout the year with a peak in density during the cool season. A density gradient from the fringing reef to the outer biogenic ridge was evident. A peak in maturity and fertility was observed during the warm season. A dwarfism of thallus length was noticed in Turbinaria ornata on the outer biogenic ridge whereas it was not observed in Sargassum mangarevense. The populations of both species settled on the fringing reef and outer biogenic ridge, two physically and chemically unstable areas, exhibited a high sexual reproduction, whereas it was lower on the inner barrier reef. Whatever the area considered the period of reproduction of these two species extended throughout the whole year. The data collected during this study were used to explain the colonization of different habitats by these two species.