期刊名称：African Journal of Environmental Science and Technology
电子版ISSN：1996-0786
出版年度：2008
卷号：2
期号：7
页码：197-207
语种：English
出版社：Academic Journals
摘要：Acacia tortilissubsp.raddiana(Fabaceae) plays an important role in the life of desert animals and is a major source of livestock feed and firewood for the native Bedouin people in Southern Sinai, Egypt. High mortality and low juvenile recruitment has been reported in recent years leading to decline in population size and number of this species. Small populations tend to be subject to an increased probability of stochastic extinction due to demographic, environmental and genetic factors. Therefore,this study aims to determine ifA. tortilissubsp.raddianapopulations suffer reduced fitness and its correlation or association with genetic diversity and mating parameters.Correlations and association between fitness, population size, genetic variation, and mating system parameters were tested using Spearman correlation and simple regression analyses. Stepwise regression analyses were used to identify useful predictors for fitness. The results revealed thatA. tortilissubsp.raddianapopulations’ fitness is generally low to verylow(0.1 ± 0.11). There was no relationship detected betweenA. tortilissubsp.raddianafitness or population size and observed or expected heterozygosity. While there was no evidence for reduced fitness inA. tortilissubsp.raddianapopulations, the study indicated that fitness is negatively associated with population size. Population size was associated also with the number of alleles (A) and number of alleles per polymorphic locus (AP). The study came to the conclusion that although the low to very low values, there is no evidence for reduced fitness inAcacia tortilissubsp.raddianasmall populations. Some of the studied populations (L6, L2, L3, and M4) are exceptionally fit which makes them the first candidates as seed source in restoration and bothin situandex situconservation efforts.
