Long‐term Temporal Variation and Community Dynamics Meiobenthic Copepods
Long‐term Temporal Variation and Community Dynamics Meiobenthic Copepods
复制标题
小型底栖桡足类的长期时间变化和群落动态
DOI：
10.2307/1936934
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发表时间：
1977
期刊：
影响因子：
4.8
通讯作者：
J. Fleeger
中科院分区：
文献类型：
--
作者：
B. C. Coull;J. Fleeger
为了确定河口底栖桡足动物群落的组织、动态和控制机制，于1973年1月在南卡罗莱纳河口建立了2个站点，相距1 km，每隔3年采样一次。这些沙泥动物群表现出独特的动态特性，但物种多样性作为群落结构的衡量指标，并不能区分两个站点内或站点之间的群落季节性差异。泥沼动物群分布深度为1 cm，群落丰度和多样性随时间随机变化，多样性受明显的季节循环控制，物种群有规律地重复出现。随着时间的推移，沙地动物多样性呈减少趋势，并与丰度增加趋势相关。沙区动物群的季节性不明显，但在10 cm的深度分布中，动物群的空间生态位高度重叠，保持了多样性。群落在物种组成、季节反应、环境格局、优势关系和控制因素等方面存在差异，但群落多样性基本一致。然而，多样性是由不同和独立的机制维持的。
To determine the organization, dynamics, and controlling mechanisms of an estuarine benthic copepod assemblage, 2 stations were established I km apart in a South Carolina estuary in January 1973, and sampled at monthly intervals for 3 yr. These sand and mud faunas displayed unique dynamic properties, yet species diversity, used as a measure of community structure, did not discrimi- nate community differences seasonally, within or between the 2 locations. The mud fauna, distributed to a depth of 1 cm, had a randomly varying community abundance and diversity over time, and diversity was controlled by a marked seasonal cycling of species suites which recurred regularly. The sand fauna diversity decreased with time and was correlated to an increasing abundance trend. Sand faunal seasonality was not marked, however, diversity was maintained by a high spatial niche overlap of fauna through a 10-cm depth distribution. The communities were different in species composition, seasonal responses, environmental re- gimes, dominance relationships, and controlling factors, yet maintained equal diversity. Diversity, however, was maintained by different and independent mechanisms.