Individual culture and experimental population dynamics of Keratella cochlearis (Rotatoria)

Hydrobiologia ◽  
1983 ◽  
Vol 107 (1) ◽  
pp. 35-45 ◽  
Author(s):  
Norbert Walz
Keyword(s):  
Population Dynamics ◽  
Experimental Population ◽  
Keratella Cochlearis ◽  
Individual Culture

scholarly journals Quantifying the effect of genetic, environmental and individual demographic stochastic variability for population dynamics in Plantago lanceolata

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ulrich K. Steiner ◽  
Shripad Tuljapurkar ◽  
Deborah A. Roach
Keyword(s):  
Population Dynamics ◽  
Population Growth ◽  
Population Change ◽  
Adaptive Dynamics ◽  
Plantago Lanceolata ◽  
Environmental Parameters ◽  
Experimental Population ◽  
Stochastic Variation ◽  
Survival And Reproduction ◽  
Stochastic Events

AbstractSimple demographic events, the survival and reproduction of individuals, drive population dynamics. These demographic events are influenced by genetic and environmental parameters, and are the focus of many evolutionary and ecological investigations that aim to predict and understand population change. However, such a focus often neglects the stochastic events that individuals experience throughout their lives. These stochastic events also influence survival and reproduction and thereby evolutionary and ecological dynamics. Here, we illustrate the influence of such non-selective demographic variability on population dynamics using population projection models of an experimental population of Plantago lanceolata. Our analysis shows that the variability in survival and reproduction among individuals is largely due to demographic stochastic variation with only modest effects of differences in environment, genes, and their interaction. Common expectations of population growth, based on expected lifetime reproduction and generation time, can be misleading when demographic stochastic variation is large. Large demographic stochastic variation exhibited within genotypes can lower population growth and slow evolutionary adaptive dynamics. Our results accompany recent investigations that call for more focus on stochastic variation in fitness components, such as survival, reproduction, and functional traits, rather than dismissal of this variation as uninformative noise.

EFFECTS OF METHAMIDOPHOS AND ACEPHATE ON EXPERIMENTAL POPULATION DYNAMICS OF ROTIFER BRACHIONUS CALYCIFLORUS

2009 ◽  
Vol 33 (2) ◽  
pp. 189-194 ◽  
Author(s):  
Li-Xia KE ◽  
Yi-Long XI ◽  
Chun-Wang ZHA ◽  
Zhao-Xia CHU
Keyword(s):  
Population Dynamics ◽  
Brachionus Calyciflorus ◽  
Experimental Population
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