Host Specificity, Community Components
and Diversity Dynamics of Dactylogyrus spp.
(Monogenean ectoparasites)
Parasitizing Cyprinid Gills

Koyee, Qaraman M.K.; Abdullah, Shamall M. A.

doi:10.15244/pjoes/99064

Cited by 4 publications

(5 citation statements)

References 22 publications

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“…Moreover, this may also imply that endemic hosts are under-explored and, therefore, that the host range of some endemic Dactylogyrus species may be wider than is actually documented, similarly as for D. omenti. This species was recently considered as a specialist of A. huegelii in the Balkans [ 31 ]; however, Koyee and Abdullah [ 62 ] reported D. omenti also from Middle Eastern L. xanthopterus. The validity of D. omenti was in their study also supported by the molecular data.…”

Section: Discussionmentioning

confidence: 99%

Molecular and morphological phylogeny of host-specific Dactylogyrus parasites (Monogenea) sheds new light on the puzzling Middle Eastern origin of European and African lineages

et al. 2021

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Background Freshwater fauna of the Middle East encompass elements shared with three continents—Africa, Asia, and Europe—and the Middle East is, therefore, considered a historical geographic crossroad between these three regions. Even though various dispersion scenarios have been proposed to explain the current distribution of cyprinids in the peri-Mediterranean, all of them congruently suggest an Asian origin for this group. Herein, we investigated the proposed scenarios using monogenean parasites of the genus Dactylogyrus, which is host-specific to cyprinoid fishes. Methods A total of 48 Dactylogyrus species parasitizing cyprinids belonging to seven genera were used for molecular phylogenetic reconstruction. Taxonomically important morphological features, i.e., sclerotized elements of the attachment organ, were further evaluated to resolve ambiguous relationships between individual phylogenetic lineages. For 37 species, sequences of partial genes coding 18S and 28S rRNA, and the ITS1 region were retrieved from GenBank. Ten Dactylogyrus species collected from Middle Eastern cyprinoids and D. falciformis were de novo sequenced for the aforementioned molecular markers. Results The phylogenetic reconstruction divided all investigated Dactylogyrus species into four phylogenetic clades. The first one encompassed species with the “varicorhini” type of haptoral ventral bar with a putative origin linked to the historical dispersion of cyprinids via the North African coastline. The second clade included the majority of the investigated species parasitizing various phylogenetically divergent cyprinid hosts. The morphological and molecular data suggest the ancestral diversification of the species of this clade into two groups: (1) the group possessing the haptoral ventral bar of the “cornu” type, and (2) the group possessing the “wunderi” type. Dactylogyrus diversification apparently occurred in the Middle East, which is indicated by the presence of species with all morphotypes in the region. The last two clades included species parasitizing cyprinids with an East Asian origin, and species possessing the “magnihamatus” type of ventral bar. Conclusions The molecular data suggest that some morphological characters of host-specific parasites may undergo convergent evolution in the divergent lineages, and therefore, to fully resolve the phylogenetic relationships among host-specific parasites, an integrative approach combining morphological and molecular data is still needed. In addition, our study indicates that parasite diversity in many regions is still under-explored, and thus we highlight the importance of studies of host-associated parasites, especially in the context of freshwater fish biogeography. Graphical Abstract

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Section: Discussionmentioning

confidence: 99%

Molecular and morphological phylogeny of host-specific Dactylogyrus parasites (Monogenea) sheds new light on the puzzling Middle Eastern origin of European and African lineages

et al. 2021

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“…Furthermore, the tree surface similarities derived from the phylogenetic analysis, carried out by Chiary et al (2014), have revealed that D. mascomai and D. lenkoranoides are genetically closely associated sister species and a high value of bootstrap was obtained for the branch formed by these sibling species. Although the current investigation has encompassed two aspects (DNA-based sequence and morphological features), only the DNA--based was depended in this study, whereas Dactylogyrids morphology-based diversification was reported in another study (Koyee and Abdullah 2019). In this regard, certain studies have pointed out that at least three characters are required to entail 95% bootstrap support, but non-contradicted groups boosted by less than three characters will essentially receive less than 95% support.…”

Section: Discussionmentioning

confidence: 74%

Polish Journal of Veterinary Sciences

Koyee

Abdullah

2019

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The current study is the first phylogenetic and secondary RNA structure analysis of Dactylogyrus species parasitising gill filaments of Iraqi cyprinid fishes. Most previous phylogenetic studies have targeted on primary DNA sequence data. Nevertheless, RNA secondary configuration is principally helpful in systematics since they comprise features that do not appear in the primary sequence and provide morphological information. The primary objective was molecular-based identification of Dactylogyrids species using evolutionary tree and secondary RNA structure prediction.

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Section: Introductionmentioning

confidence: 86%

“…However, no previous study focusing on the diversity of monogeneans parasitizing fish species in Iraq applied genetic data for taxonomical purposes, nor performed molecular phylogenetic reconstruction. Besides the studies of Koyee and Abdullah (2019) and Benovics et al (2021a), no genetic data are so far available for Iraq monogeneans. Recently, an integrative approach combining genetic characterization with commonly used, taxonomically important morphological characters has become the gold standard with respect to taxonomical research on monogeneans (e.g.…”

Section: Introductionmentioning

confidence: 99%

Uncovering the monogenean species diversity of cyprinoid fish in Iraq using an integrative approach

Benovics,

Rahmouni,

Řehulková

et al. 2023

Parasitology

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The freshwaters of Iraq harbour a high diversity of endemic and phylogenetically unique species. One of the most diversified fish groups in this region is cyprinoids, and although their distribution is relatively well known, their monogenean parasites have only rarely been investigated. Herein, we applied an integrative approach, combining morphology with molecular data, to assess the diversity and phylogeny of cyprinoid-associated monogenean parasites. A total of 33 monogenean species were collected and identified from 13 endemic cyprinoid species. The highest species diversity was recorded for Dactylogyrus (Dactylogyridae, 16 species) and Gyrodactylus (Gyrodactylidae, 12 species). Four species of Dactylogyrus and 12 species of Gyrodactylus were identified as new to science and described. Two other genera, Dogielius (Dactylogyridae) and Paradiplozoon (Diplozoidae), were represented only by 4 and 1 species, respectively. Phylogenetic analyses of the Dactylogyrus and Gyrodactylus species revealed that the local congeners do not form a monophyletic group and are phylogenetically closely related to species from other regions (i.e. Europe, North Africa and Eastern Asia). These findings support the assumption that the Middle East served as an important historical crossroads for the interchange of fauna between these 3 geographic regions.

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Host Specificity, Community Components and Diversity Dynamics of Dactylogyrus spp. (Monogenean ectoparasites) Parasitizing Cyprinid Gills

Cited by 4 publications

References 22 publications

Molecular and morphological phylogeny of host-specific Dactylogyrus parasites (Monogenea) sheds new light on the puzzling Middle Eastern origin of European and African lineages

Molecular and morphological phylogeny of host-specific Dactylogyrus parasites (Monogenea) sheds new light on the puzzling Middle Eastern origin of European and African lineages

Polish Journal of Veterinary Sciences

Uncovering the monogenean species diversity of cyprinoid fish in Iraq using an integrative approach

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