Intraspecific morphological variation in Cichlidogyrus (Monogenea) parasitizing two cichlid hosts from Lake Tanganyika exhibiting different dispersal capacities

Rahmouni, Chahrazed; Steenberge, Maarten Wouter Van; Vanhove, Maarten Pieterjan; Šimková, Andrea Vetešníková

doi:10.1007/s10750-020-04429-1

Cited by 15 publications

(18 citation statements)

References 59 publications

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“…The lack of a clear genetic phylogeographic structure in C. casuarinus is in accordance with the fact that the MCO structures are of similar size throughout the lake, suggesting there is no reproductive isolation at the geographical scale. A positive correlation between host dispersal capacity and monogenean intraspecific morphological variability was suggested already for other cichlidmonogenean combinations in the lake by another recent study [34]. Similar to the present study, morphological variation related to different host and external environmental conditions was reported in Neobenedenia girellae (Hargis, 1955), a cosmopolitan fish parasite [77] and Gyrodactylus katharineri Malmberg, 1964 infecting various cyprinid hosts in Europe [78].…”

Section: Morphological and Mitochondrial Diversity And Host Use In Cichlidogyrus Casuarinussupporting

confidence: 88%

“…from sparid fishes in the Mediterranean Sea [80]. The fact that morphologically similar sister species [70] [34,81]. Moreover, the previous suggestion that host species size is related to morphological variation of C. casuarinus [28] has been confirmed here.…”

Section: Morphological and Mitochondrial Diversity And Host Use In Cichlidogyrus Casuarinussupporting

confidence: 83%

“…In order to understand microevolutionary processes driving the hostspecificity of parasites, it is paramount to understand thoroughly what the drivers of generalism and large host range are. The combination of high host dispersal capacities and low host population densities was proposed to cause reduced parasite host-specificity in deep waters [30][31][32], while the former have been suggested to affect the morphology of monogenean populations in Lake Tanganyika [33,34]. This is likely also the case for Cichlidogyrus casuarinus Pariselle, Muterezi Bukinga & Vanhove, 2015, which is classified as intermediate generalist parasite (infecting host species from more than one genus, following [35] infecting bentho-and eupelagic bathybatine cichlids in the lake.…”

Section: Introductionmentioning

confidence: 99%

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Contrasting Host-parasite Population Structure and Role of Host Specificity: Morphology and Mitogenomics of a Parasitic Flatworm on Pelagic Deepwater Cichlid Fishes from Lake Tanganyika

Kmentová¹,

Hahn²,

Koblmüller³

et al. 2021

Preprint

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Little phylogeographic structure is presumed for highly mobile species in pelagic zones. Lake Tanganyika is a unique ecosystem with a speciose and largely endemic fauna famous for its remarkable evolutionary history. In bathybatine cichlid fishes, the pattern of lake-wide population differentiation differs among species. We tested the magnifying glass hypothesis for their parasitic flatworm Cichlidogyrus casuarinus. Lake-wide population structure of C. casuarinus ex Hemibates stenosoma was assessed based on a portion of the mtCOI gene combined with morphological characterisation. Additionally, intraspecific mitogenomic variation among 80 individuals within one spatially constrained parasite metapopulation sample was assessed using shotgun NGS. While no clear geographic genetic structure was detected in parasites, both geographic and host-related phenotypic variation was apparent. The incongruence with the genetic north-south gradient observed in the host may be explained by the broad host range of this flatworm as some of its other host species previously showed no lake-wide restriction of gene flow. Our results are consistent with host driven morphological variation without genetic differentiation of the parasite, and highlight the importance of integratively approaching parasites` potential as “tags” for their hosts. We present the first parasite mitogenome from Lake Tanganyika and propose a methodological framework for studying intraspecific mitogenomic variation of dactylogyrid monogeneans.

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Section: Morphological and Mitochondrial Diversity And Host Use In Cichlidogyrus Casuarinussupporting

confidence: 88%

Section: Morphological and Mitochondrial Diversity And Host Use In Cichlidogyrus Casuarinussupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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Contrasting Host-parasite Population Structure and Role of Host Specificity: Morphology and Mitogenomics of a Parasitic Flatworm on Pelagic Deepwater Cichlid Fishes from Lake Tanganyika

Kmentová¹,

Hahn²,

Koblmüller³

et al. 2021

Preprint

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“…2020) to describe species of Cichlidogyrus in more detail. Second, geomorphometric analyses have been employed for the anchors of some species of Cichlidogyrus (Rahmouni et al . 2020) as well as other monogeneans (Vignon and Sasal 2010; Rodríguez-González et al .…”

Section: Discussionmentioning

confidence: 99%

“…Second, geomorphometric analyses have been employed for the anchors of some species of Cichlidogyrus (Rahmouni et al 2020) as well as other monogeneans (Vignon and Sasal 2010 ;Rodríguez-González et al 2017 ;Kmentová et al 2020) to infer the most systematically informative structures. Third, 3D imaging techniques as previously developed (which was not certified by peer review) is the author/funder.…”

Section: Classification Prediction and Research Prospectsmentioning

confidence: 99%

Somewhere I belong: phylogeny and morphological evolution in a species-rich lineage of ectoparasitic flatworms infecting cichlid fishes

Cruz-Laufer

Pariselle

Jorissen

et al. 2021

Preprint

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Metazoan parasites encompass a significant portion of the global biodiversity. Their relevance for environmental and human health calls for a better understanding as parasite macroevolution remains mostly understudied. Yet limited molecular, phenotypic, and ecological data have so far discouraged complex analyses of evolutionary mechanisms and encouraged the use of data discretisation and body-size correction. In this case study, we aim to highlight the limitations of these methods and propose new methods optimised for small datasets. We apply multivariate phylogenetic comparative methods (PCMs) and statistical classification using support vector machines (SVMs) to a data-deficient host-parasite system. We use continuous morphometric and host range data currently widely inferred from a species-rich lineage of parasites (Cichlidogyrus incl. Scutogyrus - Platyhelminthes: Monogenea, Dactylogyridae) infecting cichlid fishes. For PCMs, we modelled the attachment organ and host range evolution using the data of 135 species and an updated multi-marker (28S and 18S rDNA, ITS1, COI mtDNA) phylogenetic reconstruction of 58/137 described species. Through a cluster analysis, SVM-based classification, and taxonomic literature survey, we infered the systematic informativeness of discretised and continuous characters. We demonstrate that an update to character coding and size-correction techniques is required as some techniques mask phylogenetic signals but remain useful for characterising species groups of Cichlidogyrus. Regarding the attachment organ evolution, PCMs suggest a pattern associated with genetic drift. Yet host and environmental parameters might put this structure under stabilising selection as indicated by a limited morphological variation. This contradiction, the absence of a phylogenetic signal and multicollinearity in most measurements, a moderate 73% accordance rate of taxonomic approach and SVMs, and a low phylogenetic informativeness of reproductive organ data suggest an overall limited systematic value of the measurements included in most species characterisations. We conclude that PCMs and SVM-based approaches are suitable tools to investigate the character evolution of data-deficient taxa.

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De novo developed microsatellite markers in gill parasites of the genus Dactylogyrus (Monogenea): Revealing the phylogeographic pattern of population structure in the generalist parasite Dactylogyrus vistulae

Benovics

Gettová

Šimková

2021

Ecology and Evolution

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Intraspecific morphological variation in Cichlidogyrus (Monogenea) parasitizing two cichlid hosts from Lake Tanganyika exhibiting different dispersal capacities

Cited by 15 publications

References 59 publications

Contrasting Host-parasite Population Structure and Role of Host Specificity: Morphology and Mitogenomics of a Parasitic Flatworm on Pelagic Deepwater Cichlid Fishes from Lake Tanganyika

Contrasting Host-parasite Population Structure and Role of Host Specificity: Morphology and Mitogenomics of a Parasitic Flatworm on Pelagic Deepwater Cichlid Fishes from Lake Tanganyika

Somewhere I belong: phylogeny and morphological evolution in a species-rich lineage of ectoparasitic flatworms infecting cichlid fishes

De novo developed microsatellite markers in gill parasites of the genus Dactylogyrus (Monogenea): Revealing the phylogeographic pattern of population structure in the generalist parasite Dactylogyrus vistulae

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