| 摘要: |
| 1994年12月—1995年3月在南极菲尔德斯半岛潮间带进行了定点南极帽贝种群空间分布的调查研究。结果表明,无论所在底质、样方大小如何,所有调查种群均呈聚集分布。对6个小尺度样方样本进行种群水平下空间结构分析得知:分布的基本成分是疏松的个体群(colony),个体群的分布是聚集的且可能是由环境异质性所引起的;个体在个体群内的分布是随机的。帽贝在岩石滩的个体群较大(面积为0.04—0.16m2),在卵石滩较小(0.01—0.04m2),在垂直岩面亦较小(0.01m2)。随时间变化(1994年12月—1995年3月),帽贝的聚集度(m*)随种群密度的下降而有所降低。在排除密度因子以后,聚集指标m*/m的数值大多稳定在3.61—4.77之间。 |
| 关键词: 南极帽贝 空间分布图式 个体群 |
| DOI：10.11693/hyhz200005009009 |
| 分类号: |
| 基金项目:国家“八五”南极攻关资助项目，85-905-02号 |
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| STUDIES ON POPULATION ECOLOGY OF THE LIMPET NACELLA CONCINNA IN THE INTERTIDAL ZONE OF FILDES PENINSULA, ANTARCTIC——SPATIAL DISTRIBUTION PATTERNS |
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IANG Nan-qing1, SHEN Jing1, XU Ru-mei1, HUANG Feng-peng2, WU Bao-ling2
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1.School of Life Sciences, Beijing Normal University, Beijing, 100875;2.First Institute of Oceanography, State Oceanic Administration, Qingdao, 266003
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| Abstract: |
| From December 1994 to March 1995, spatial distribution patterns of the limpet population, Nacella concinna were investigated in the intertidal zone of Fildes Peninsula, Antarctic. The intertidal ecosystem was classified into pebble, rocky and vertical rocky shores according to their substrates and slopes. The data were classified into large and small size sets, for pebble shore and rocky shore. We recorded the limpet number in each grid. In order to indentify the spatial distribution of the limpet population, we compared the observed frequency distribution with the theoretical by probable frequency by using Poisson, Neyman A and Negative Binomial Distributions. During the experiment, limpet population, regardless to its sample size and substrates, all showed an aggregated distribution pattern. All samples of small size (0.1×0.1m2 or 0.2×0.2m2) fitted to the Negative Binomial distribution. Samples of large size (1×1m2) fitted well to Iwao’s model. However, the improved Iwao’s model could fit better (m*=12.9965+0.1771m+0.2508m2). Samples of small size fitted to Iwao’s model (m*=-0.0525+5.0108m), but α<0, and β>1 was not statistically significant. The populations were comprised of loose colonies. The distribution of the colonies showed an aggregated pattern, and individuals within the colonies distributed randomly. On rocky substrates, colony sizes were relatively big (0.04 to 0.16 m2), but smaller on pebble (0.01 to 0.04 m2) and vertical rock (0.01 m2) substrates. During the austral season, index of mean crowding (m*) decreased with the population density. Excluding the density effect, m*/m is generally stabilized between 3.61 and 4.77. |
| Key words: Antarctic limpets, Spatial distribution patterns, Colony |
