![]() ![]() To characterize survival-probability curves, we develop and analyse simple stochastic models for the ecology and genetics of small populations. The inflection point of this function defines the critical population size. We define a strong genetic Allee effect as a genetic process that causes a population's survival probability to be a sigmoid function of its initial size. In this study, we aim to (i) develop a meaningful notion of a 'strong genetic Allee effect', (ii) explore whether and under what conditions such an effect can arise from inbreeding depression due to recessive deleterious mutations, and (iii) quantify the interaction of potential genetic Allee effects with the well-known mate-finding Allee effect. In the ecological literature, such threshold phenomena are called 'strong Allee effects' and they can arise for example from mate limitation in small populations. However, it is generally unclear whether extinction risk from genetic causes gradually increases with decreasing population size or whether there is a sharp transition around a specific threshold population size. It is now widely accepted that genetic processes such as inbreeding depression and loss of genetic variation can increase the extinction risk of small populations. Wittmann, Meike J Stuis, Hanna Metzler, Dirk Genetic Allee effects and their interaction with ecological Allee effects. National Oceanic and Atmospheric Administration, Department of Commerce — The Waianae Ecological Characterization is a digital synthesis of historical and current physical, ecological, and cultural information about the Waianae moku, which. Waianae Ecological Characterization Oahu, Hawaii 2004 ![]()
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