Sympatric speciation in Nicaraguan crater lake cichlid fish

Barluenga, Marta; Stölting, Kai N.; Salzburger, Walter; Muschick, Moritz; Meyer, Axel

doi:10.1038/nature04325

Cited by 606 publications

(743 citation statements)

References 24 publications

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“…This time may have been sufficient to have allowed populations in individual lagoons to differentiate and diverge into unique populations. Similar time period has been found in Crater Lake cichlids in Nicaragua, to be sufficient even for the origin of new species (Barluenga et al, 2006;Kautt et al, 2012). Although the route and timing of the colonisation history of the Magadi-Natron lake basin remains unclear, several periods of high water levels have been reported within the entire soda lake region and could have provided opportunities for exchange of fish between the three lakes.…”

Section: Genetic Diversity Of Magadi Tilapiasupporting

confidence: 59%

Pronounced genetic differentiation of small, isolated and fragmented tilapia populations inhabiting the Magadi Soda Lake in Kenya

2013

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Lake Magadi, an alkaline hypersaline lake in Kenya, is one of the most extreme water bodies known. Although its water temperatures often exceed 40°C, a particular lineage of 'dwarf' tilapia, Alcolapia grahami, has evolved remarkable adaptations to survive in this hostile environment. Magadi tilapia exists in small fragmented populations in isolated lagoons within Lake Magadi and its satellite Lake, Little Magadi. In spite of the potential this tilapia holds for understanding evolutionary processes in stressful environments, few genetic studies have focused on this species. We examined the genetic diversity and spatial genetic relationships of Magadi tilapia populations using microsatellite and mitochondrial markers. High levels of genetic variation were found to be supporting the hypothesis that A. grahami populations represent remnants of a much larger fish population that inhabited paleo-lake Orolonga. In contrast to previous studies, we found a well-supported genetic structure of A. grahami consisting of three differentiated genetic clusters (a) Little Magadi, (b) Fish Spring Lagoon and (c) Rest of Magadi. Given the importance of this species to the Magadi ecosystem and its potential evolutionary significance, the three genetic clusters should be considered as separate gene pools and conservation strategies aimed at protecting the species based on these clusters are recommended.

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Section: Genetic Diversity Of Magadi Tilapiasupporting

confidence: 59%

Pronounced genetic differentiation of small, isolated and fragmented tilapia populations inhabiting the Magadi Soda Lake in Kenya

2013

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“…Some of them are based on a model of adaptive radiation which is intended to be more abstract and general Vose 2005, 2009). Other attempts use models tailored for particular case studies such as cichlids in a crater lake (Barluenga et al 2006;), palms on an oceanic island Savolainen et al 2006), snails on seashores (Hollander et al 2005(Hollander et al , 2006Sadedin et al 2008), and butterflies in jungles (Duenez-Guzman et al 2009;Mavárez et al 2006). The general setup in all these models is similar.…”

Section: A Theory Of Adaptive Radiationmentioning

confidence: 99%

High-Dimensional Fitness Landscapes and Speciation

Gavrilets¹

2010

Evolution—the Extended Synthesis

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The Modern Evolutionary Synthesis of the 1930s and 1940s remains the paradigm of evolutionary biology (Futuyma 1998;Gould 2002;Pigliucci 2007;Ridley 1993). The progress in understanding the process of evolution made during that period had been a direct result of the development of theoretical population genetics by Fisher, Wright, and Haldane, who built a series of mathematical models, approaches, and techniques showing how natural selection, mutation, drift, migration, and other evolutionary factors are expected to shape the genetic and phenotypic characteristics of biological populations. These theoretical advances provided "a great impetus to experimental work on the genetics of populations" (Sheppard 1954) and a "guiding light for rigorous quantitative experimentation and observation" (Dobzhansky 1955), and had many other far-reaching implications.According to Provine (1978), the work of Fisher, Wright, and Haldane had significant influence on evolutionary thinking in at least four ways. First, their models showed that the processes of selection, mutation, drift, and migration were largely sufficient to account for microevolution. Second, they showed that some directions explored by biologists were not fruitful. Third, the models complemented and lent greater significance to particular results of field and laboratory research. Fourth, they stimulated and provided framework for later empirical research. Since the time of the Modern Synthesis, evolutionary biology has arguably remained one of the most mathematized branches of the life sciences, in which mathematical models and methods continuously guide empirical research, provide tools for testing hypotheses, explain complex interactions between multiple evolutionary factors, train biological intuition, identify crucial parameters and factors, evaluate relevant temporal and spatial scales, and point to the gaps in biological knowledge, as well as provide simple and intuitive tools and metaphors for thinking about complex phenomena. In this chapter, I discuss two particular areas of theoretical evolutionary biology that have experienced significant progress since the late 1980s: a theory of fitness landscapes and a theory of speciation. I also outline two particular directions for theoretical studies on the origins of biodiversity which are especially important, in my opinion, for unification of different branches of the life sciences. One is the development of a theory of large-scale evolutionary diversification and adaptive radiation. The other is a quantitative theory of the origins of our own species. Classical Fitness LandscapesThe theoretical notion of fitness landscapes (also known as "adaptive landscapes," "adaptive topographies," and "surfaces of selective value"), which emerged at the onset of the Modern Synthesis, has become a standard tool both for formal mathematical modeling and for the intuitive metaphorical visualizing of biological evolution, adaptation, and speciation. This notion was first introduced by Sewall Wright in a classic paper deliv...

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“…The effect of geographical isolation on speciation has been studied in terrestrial and freshwater organisms (Chiba, 1998;Kliman et al, 2000;Caccone et al, 2001;Calsbeek and Smith, 2003;Meyer et al, 1990;Barluenga et al, 2006); however, little is known about what effect this may have on marine organisms. In this section, we introduce the general aspects of "the marine lakes as a model for isolated marine environments" in the Palau Islands and the fauna of the marine lakes, and show the peculiar evolution of some marine animals as inferred from their genetic population structures.…”

Section: Genetic Diversity and Evolution In The Marine Lakes Of The Pmentioning

confidence: 99%