Shifting barriers and phenotypic diversification by hybridisation

Sefc, Kristina M.; Mattersdorfer, Karin; Ziegelbecker, Angelika; Neuhüttler, Nina; Steiner, Oliver; Goessler, Walter; Koblmüller, Stephan

doi:10.1111/ele.12766

Cited by 28 publications

(41 citation statements)

References 75 publications

(198 reference statements)

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“…In the past, geological processes and recurrent cycles of droughts and increased humidity caused lake level fluctuations with an extent of several hundreds of meters, potentially leading to recurrent separation of the lake's three sub-basins (Danley et al, 2012). It is suggested that those processes played an important role in shaping the lake's biodiversity (Sturmbauer et al, 2001;Sefc et al, 2017) and productivity (Cohen et al, 2006). Lake Tanganyika has attracted scientific interest for decades, mainly because of its diverse cichlid species assemblage, which comprises over 200 endemic species (Koblmüller et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Monogenean parasites of sardines in Lake Tanganyika: diversity, origin and intraspecific variability

Kmentová

Steenberge

Raeymaekers

et al. 2018

CTOZ

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Whereas Lake Tanganyika's littoral and benthic zones are famous for their diverse fish communities, its pelagic zone is dominated by few species, of which two representatives of Clupeidae (Limnothrissa miodon and Stolothrissa tanganicae) take a pivotal role. We investigated the monogenean fauna infecting these freshwater clupeids to explore the link between parasite morphology and host species identity, or seasonal and geographical origin, which may reveal host population structure. Furthermore, we conducted phylogenetic analyses to test whether these parasitic flatworms mirror their host species' marine origin. Based on 406 parasite specimens infecting 385 host specimens, two monogenean species of Kapentagyrus Kmentová, Gelnar and Vanhove, gen. nov. were morphologically identified and placed in the phylogeny of Dactylogyridae using three molecular markers. One of the species, Kapentagyrus limnotrissae comb. nov., is host-specific to L. miodon while its congener, which is new to science and described as Kapentagyrus tanganicanus Kmentová, Gelnar and Vanhove, sp. nov., is infecting both clupeid species. Morphometrics of the parasites' hard parts showed intra-specific variability, related to host species identity and seasonality in K. tanganicanus. Significant intra-specific differences in haptor morphometrics between the northern and southern end of Lake Tanganyika were found, and support the potential use of monogeneans as tags for host population structure. Based on phylogenetic inference, we suggest a freshwater origin of the currently known monogenean species infecting clupeids in Africa, with the two species from Lake Tanganyika representing a quite distinct lineage.

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Section: Introductionmentioning

confidence: 99%

Monogenean parasites of sardines in Lake Tanganyika: diversity, origin and intraspecific variability

Kmentová

Steenberge

Raeymaekers

et al. 2018

CTOZ

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“…Since prezygotic rather than postzygotic barriers are believed to maintain the diversity of closely related sympatric cichlids (Kornfield and Smith, 2000), differences in phenotypic traits and reproductive behaviours are likely involved in maintaining species boundaries. Yet, many instances of hybridisation have been found in Great Lake cichlids (Rüber et al, 2001;Salzburger et al, 2002b;Smith et al, 2003;Egger et al, 2007;Koblmüller et al, 2007;Keller et al, 2013), which may have played an important role in shaping the cichlid radiations (Seehausen, 2004;Sefc et al, 2017). Female mate choice, potentially based on male reproductive behaviour, has been suggested as the main barrier for hybridisation in cichlids (Kocher, 2004).…”

Section: Introductionmentioning

confidence: 99%

Limited possibilities for prezygotic barriers in the reproductive behaviour of sympatric Ophthalmotilapia species (Teleostei, Cichlidae)

Kéver

Parmentier

Derycke

et al. 2018

Zoology

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Since prezygotic rather than postzygotic barriers are believed to maintain the diversity of closely related sympatric cichlids, differences in phenotypic traits and reproductive behaviours are likely involved in maintaining species boundaries. Here, we focused on the reproductive behaviour of three Ophthalmotilapia species with distributions that only overlap on a small stretch of the shore line of Lake Tanganyika. Repeated introgression of mitochondrial DNA between these species was previously reported, which suggested they can hybridise. Our aim is to test the hypothesis that reproductive behaviour acts as a prezygotic barrier that prevents frequent hybridisation in sympatric Ophthalmotilapia species. We performed a quantitative analysis of twelve reproductions (four for O. ventralis, six for O. nasuta, one for O. boops, and one between a female O. ventralis and a male O. nasuta). Although similar ethograms were obtained for these reproductions, the O. ventralis and O. boops males displayed a behaviour that was never performed by O. nasuta males. This behaviour was displayed during courtship and we called it 'invite'. In O. ventralis, we could show that it was associated with the emission of a single pulse sound. The comparison of O. nasuta and O. ventralis reproductive behaviours also revealed some quantitative differences: O. ventralis males showed the location of the bower more often to the female, whereas O. ventralis females followed the male more often. The similarity between the reproductive behaviours in O. ventralis and O. nasuta could explain the occurrence of the heterospecific spawning event recorded between an O. nasuta male and an O. ventralis female. Importantly, few eggs were laid and the maternal mouthbrooding that resulted from this heterospecific reproduction only lasted for two days, which suggested the abortion of egg development. Hence, in the absence of conspecifics, courtship and mating behaviours alone do not constitute perfect prezygotic barriers between these two species.

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“…It could also reflect changes in the network dynamics of populations, for example due to fluctuations in the lake level originating and reshuffling barriers to gene flow. Intermittent connectivity, oscillations in population size and colonization events are known to affect diversity distribution (examples in Lake Tanganyika cichlids: Koblmüller et al, 2011;Nevado et al, 2013;Sefc et al, 2017). Our genetic data showed signatures of population expansion in Congo and Zambia (locations pooled by country), whereas it revealed bottlenecks in three local populations (Lahanga, Katoto and Toby).…”

Section: Genome-wide Variationmentioning

confidence: 66%

Morphological and genetic correlates in the left–right asymmetric scale-eating cichlid fish of Lake Tanganyika

Raffini

Fruciano

Meyer

2018

Biological Journal of the Linnean Society

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The stable polymorphism in mouth asymmetry in the cichlid fish Perissodus microlepis is a textbook example of adaptive evolution accomplished by functionally relevant morphological changes, ecological specialization and negative frequency-dependent selection. Knowledge about the morphological and developmental basis of this stable polymorphism and the mechanisms driving intraspecific variation in this fish remains largely incomplete. Here, we focus on often-neglected but potentially important aspects of the biology of this fish. In particular, we explore patterns of body shape variation, neutral genome-wide genetic diversity across its geographical distribution, and the presence of asymmetry in eyes centroid size in relationship to mouth bending angle. Geographical space (or a factor associated with geography) has a significant effect on both morphological and genetic diversity, suggesting restricted gene flow across the range of this species. We discuss potential implications of these observed patterns, including the possibility that the genetic basis of asymmetry could vary among locations. A significant association between eye and mouth laterality suggests that the entire head might be involved in the asymmetry. These findings highlight that head asymmetry in P. microlepis is a complex polymorphism involving the interaction of the genetic basis of multiple potentially independent traits and the environment.

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Shifting barriers and phenotypic diversification by hybridisation

Cited by 28 publications

References 75 publications

Monogenean parasites of sardines in Lake Tanganyika: diversity, origin and intraspecific variability

Monogenean parasites of sardines in Lake Tanganyika: diversity, origin and intraspecific variability

Limited possibilities for prezygotic barriers in the reproductive behaviour of sympatric Ophthalmotilapia species (Teleostei, Cichlidae)

Morphological and genetic correlates in the left–right asymmetric scale-eating cichlid fish of Lake Tanganyika

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