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Showing 1 to 11 of 11 for “"cichlid fish"”.
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The Effect of Gonadotropin Releasing Hormone on Opsin Gene Expression and Spectral Sensitivity in Zebra Cichlid Fish (Metriaclima zebra).
… maintenance of species diversity in Lake Malawi cichlid fishes are greatly dependent on optical communication, which is influenced by environmental, physiological and endocrinological factors. The diversity in spectral sensitivity of cichlids has been partially attributed to differences in opsin …
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Subacute immunotoxic effects of the environmental contaminants 7,12-dimethylbenzanthracene (DMBA), hexachlorocyclohexane (lindane), and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) on spleen and pronephros cellularity and morphology and functional activity of macrophages contained in these hematopoietic organs in the cichlid fish tilapia (<i>Oreochromis niloticus</i>)
… of immune parameters were investigated in fish exposed to non-overtly toxic levels of three different environmentally relevant chemicals, 7,12-dimethylbenzanthracene (DMBA), hexachlorocyclohexane (lindane), and 2,3,7,8- tetrachlorodibenzo-p -dioxin (TCDD). Each chemical agent was …
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NUCLEAR PROGESTIN RECEPTOR REGULATES FERTILITY AND SPAWNING IN FEMALE CICHLID ASTATOTILAPIA BURTONI
… well understood. I utilize gene editing in the cichlid fish Astatotilapia burtoni to understand the effects of hormones on its well-documented spawning routine. In female cichlids, prostaglandin F2a (PGF2α) drives spawning behaviors. Sensitivity to PGF2α and expression of its receptor, ptgfr, …
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EVOLUTION OF FRESHWATER CRABS IN LAKE MALAWI AND THE LAKE MALAWI BASIN IN THE EAST AFRICAN RIFT VALLEY
… Malawi, in contrast to the lake’s highly-diverse cichlid fish species flocks. The Malawi Blue Crab is presently assigned to <em>Potamonautes lirrangensis</em> (Rathbun, 1904) sensu lato, which was originally described from a single female specimen from the D. R. Congo. While the distribution of …
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An ecosystem-based approach to balancing cage aquaculture, capture fisheries, and biodiversity conservation in Lake Victoria, Kenya
Lake Victoria is known for its cichlid fish species flock of 500 or more, which have been drastically decreased due to mass extinction. The lake's fisheries transformed from artisanal to industrial, with exotic species displacing the indigenous flock, changes linked to local and global …
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New insights into Transposable Elements from high quality genome sequences across diverse animals
… of transposable elements in the haplochromine cichlid fish radiation of Lake Malawi, uncovering the large diversity of transposable elements present in these cichlids and how they manifest different patterns of activity in different populations and species. To conclude this chapter I discuss …
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Male gamete morphology in relation to swimming velocity and fertilisation microenvironment
… exists. The second topic of research focuses on cichlid fish. Cichlids from Lake Malawi have been underrepresented in the published literature in sperm biology despite being extensively studied in relation to other aspects of their biology. A phylogenetically controlled study into links between …
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Colouration evo-devo: the developmental basis of intra-specific variation in cichlid pigmentation
… a trait exhibiting adaptive variation. Cichlid egg-spots are a well-suited model for investigating the development of diversifying traits. Evolving under sexual selection, egg-spots are dense aggregations of xanthophores and iridophores on haplochromine cichlid anal fins, exhibiting …
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Illuminating the Drivers of Genomic Diversification in Lamprologine Cichlids of the Lower Congo River
<p>Freshwater fishes are extraordinarily diverse, considering their available habitats represent a tiny proportion of the earth’s surface. Rivers connect heterogeneous habitats in a linear form and provide excellent simplified models to understand how aquatic biodiversity evolves. In particular, …
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Population genetics of the cichlid, Cynotilapia afra (Günther 1894), in its native and introduced ranges in Lake Malawi
… with range expansions in the natural world. The cichlid species flock of Lake Malawi consists of an estimated 451-800 species and is a textbook example of explosive speciation that has been studied as a model system of evolution in the past three decades. In addition, fish are of major …
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Towards a Pangenome Perspective on the Lake Malawi Cichlid Radiation
The cichlid fishes in the East African Rift lakes are one of nature’s most spectacular vertebrate radiations and form an excellent system to study the evolutionary process of speciation. Lake Victoria, Malawi and Tanganyika are each home to hundreds of species with a wide spectrum of sizes, …