Genetic Diversity in <i>Cichla monoculus</i> (Spix and Agassiz, 1931) Populations: Implications for Management and Conservation

Abstract

Problem statement: The object of this study was to examine the genetic structure and gene flow in Cichla monoculus populations in seven varzea lakes of the Solimoes River using Randomly Amplified Polymorphic DNA (RAPD) markers, to monitor the region where petroleum is transported in the Amazon basin. Approach: The loss of genetic diversity is one of the main factors leading to reduced evolutionary potential in species of fish. In this context, this paper seeks to understand how the influence of the stretch of pipeline in the Solimoes River between the cities of Manaus-Coari influences the genetic structure of C. monoculus. For this we measured the level of genetic diversity and structure of the species in the studied stretch. Results: Proportions of polymorphic loci varied from 8.7-39.7% in analyzed populations. Low heterozygosis levels were detected (He = 0.1652) and highly structured populations in the seven lakes with low gene flow (Nm = 0.7025) among all fish studied. Unexpected differentiation was found between fishes among the lakes. Fish populations from lakes closest to Manaus (human population of ~2 million) are different from those occurring in lakes closest to the Coari region (close proximity to petroleum barge transfer terminals). Conclusion/Recommendations: Differentiation can be explained by natural causes. This study identifies antropogenic activities influencing this species overall. Since industrial fishing is prevalent due to the high economic value of C. monoculus. Also, this species posses behavioral characteristics that are desirable in sports fishing. Management and conservation of this species will be necessary in the near future to recover genetic variability levels in each lake and allow gene flow among them. Further studies are needed to better understand the differentiation among populations.

River Reorganization Affects Populations of Dwarf Cichlid Species (Apistogramma Genus) in the Lower Negro River, Brazil

“…Thus, for conservation measures to be effective, they must be based on the information between environment and organism, in order to avoid local extinction of threatened species. The integration of some types of analyses, such as species distribution, phenotypic variation, landscape change, and population genetics, can contribute to management and conservation strategies (Santos et al, 2011(Santos et al, , 2016Escobar et al, 2015;Gravena et al, 2015). In addition, knowledge of the biology of the species is vital for defining a conservation strategy, particularly in areas under environmental pressure.…”