Comparative demography and population dynamics of two coexisting copepods in a Venezuelan floodplain lake
Comparative demography and population dynamics of two coexisting copepods in a Venezuelan floodplain lake
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委内瑞拉洪泛区湖泊中两种共存桡足类动物的人口统计学和种群动态比较
DOI：
10.4319/lo.1994.39.2.0234
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发表时间：
1994
影响因子：
4.5
通讯作者：
S. Twombly
中科院分区：
文献类型：
--
作者：
S. Twombly
我使用逆矩阵投影模型来估计文祖兰洪泛平原湖泊中两种共存的桡足类物种的生命速率（生长、存活和繁殖），作为确定决定物种分布和丰度的最终环境因素的第一步。从1984年6月到12月，我们每周对浮游动物进行四次采样，并将得到的丰度数据与估计技术一起用于提取6个月期间的生命率时间序列。各种属的种群最大值存在明显的时间差异。随着NV期、NVI期、CTII期和CIV期的招募和死亡率的变化，黑唇瓣的丰度有所波动。与此相反，amazon Oithona的种群大小与繁殖无关，但与最年轻的桡足动物阶段的存活率直接相关，直到10月份，最年轻的桡足动物阶段的存活率才有所下降。这些人口分析以最易受环境（选择）压力影响的阶段为目标，为理解进化历史策略的演变提供了基础，并提出了一种假说（尚未经过验证），即丰度由不同的人口（以及环境）因素决定的特定物种之间的长期共存是容易的。
I used an inverse matrix projection model to estimate vital rates (growth, survival, and reproduction) for two coexisting copepod spccics in a Venczuclan floodplain lake as a first step in identifying the ultimate environmental factors that determine distribution and abundance of a species. Zooplankton were sampled four times a week from June through December 1984, and the resulting abundance data were used together with the estimation technique to extract time series of vital rates over a 6-month period. There were marked temporal differences in population maxima of each species. Abundance of Diaptomus negrensis fluctuated with changes in recruitment and mortality of stages NV, NVI, CTII, and CIV. Peak abundance of Il. negrensis coincided with a peak in the abundance of the invertebrate predator Chaoborus sp. In contrast, population size of Oithona amazonica was unrclatcd to recruitment but directly related to survival of the youngest copepoditc stages, which was poor until October when abundance of Chaoborus declined. These demographic analysts target the stages most susceptible to environmental (selection) pressures, providing a basis for understanding the evolution of lift-history strategies, and suggest the hypothesis (as yet untested) that prolonged cocxistencc is facilitated between spccics whose abundance is dctermincd by different demographic (and thus environmental) factors.