First description of monogenean parasites in Lake Tanganyika: the cichlid Simochromis diagramma (Teleostei, Cichlidae) harbours a high diversity of Gyrodactylus species (Platyhelminthes, Monogenea)

Parasitology ◽  
2010 ◽  
Vol 138 (3) ◽  
pp. 364-380 ◽  
Author(s):  
MAARTEN P. M. VANHOVE ◽  
JOS SNOEKS ◽  
FILIP A. M. VOLCKAERT ◽  
TINE HUYSE
Keyword(s):  
Dna Sequences ◽  
Host Species ◽  
Lake Tanganyika ◽  
Cichlid Fish ◽  
Copulatory Organ ◽  
Fish Parasites ◽  
Nuclear Ribosomal Dna ◽  
Single Host ◽  
History Of ◽  
First Time

SUMMARYLake Tanganyika harbours the most diverse endemic cichlid fish assemblage of Africa, but its monogenean fish parasites have not been investigated. Here we report, for the first time, on the Gyrodactylus parasites in this hotspot of fish biodiversity. Haptor morphometrics and nuclear ribosomal DNA sequences revealed 3 new species on Zambian Simochromis diagramma: Gyrodactylus sturmbaueri n. sp., G. thysi n. sp. and G. zimbae n. sp. Their distinct morphology and strong genetic differentiation suggest that they belong to distant lineages within the genus Gyrodactylus, and phylogenetic reconstructions suggest affinities with other genera of gyrodactylids. Additional U-shaped haptoral plates in G. thysi n. sp. and a second large spine-like structure in the male copulatory organ of G. zimbae seem to represent new features for the genus. Such large diversity on a single host species can probably be explained by host-switching events during the course of evolution, in agreement with the generally accepted concept that ecological transfer is an important aspect of gyrodactylid speciation. Additional parasitological surveys on other host species, covering a broader phylogenetic and geographical range, should clarify the evolutionary history of Gyrodactylidae on cichlids in the African Great Lake and other parts of Africa.

scholarly journals Jumping through the hoops: the challenges of daffodil (Narcissus) classification

2019 ◽  
Vol 190 (4) ◽  
pp. 389-404 ◽  
Author(s):  
Kálmán Könyves ◽  
John David ◽  
Alastair Culham
Keyword(s):  
Dna Sequences ◽  
Phylogenetic Trees ◽  
Plastid Dna ◽  
Microsatellite Data ◽  
Population Sampling ◽  
Molecular Phylogenetic ◽  
History Of ◽  
Nuclear Microsatellite ◽  
Congruent Group ◽  
First Time

Abstract Hoop-petticoat daffodils are a morphologically congruent group comprised of two distinct lineages in molecular phylogenetic trees of Narcissus. It is possible that the morphological similarity is a product of both historic and current low-level gene flow between these lineages. For the first time, we report population sampling from across the entire range of distribution covering the Iberian Peninsula and Morocco. In total, 455 samples were collected from 59 populations. Plastid DNA sequences of matK and ndhF were generated alongside 11 microsatellite loci to permit comparison between plastid and nuclear lineage histories. The plastid DNA phylogenetic tree was highly congruent with previous molecular studies and supported the recognition of these two lineages of hoop-petticoat daffodils as separate sections. Assignment of samples to sections sometimes differed between plastid DNA and (nuclear) microsatellite data. In these cases, the taxa had previously been the focus of dissent in taxonomic placement based on morphology. These discrepancies could be explained by hybridization and introgression among the two lineages during the evolution of hoop-petticoat daffodils, and shows that placement of species in sections is dependent on the source of data used. This study underlines the complex evolutionary history of Narcissus and highlights the discrepancies between floral morphology and phylogeny, which provides a continuing challenge for the systematics of Narcissus.

A new perennial Erysimum species from Turkey, E. nemrutdaghense (Brassicaceae)

Phytotaxa ◽  
2018 ◽  
Vol 336 (3) ◽  
pp. 239 ◽  
Author(s):  
BİROL MUTLU
Keyword(s):  
New Species ◽  
Dna Sequences ◽  
Its Region ◽  
Nuclear Ribosomal Dna ◽  
Similar Species ◽  
Sem Images ◽  
First Time ◽  
East Anatolia ◽  
A New Species ◽  
Different Parts

In this study, Erysimum nemrutdaghense Mutlu (Brassicaceae) is described as a new species from the province of Adıyaman in the South-east Anatolia. In order to determine the phylogenetic relationships of the new species, a portion of the nuclear ribosomal DNA sequences of ITS region was used. In addition to the new species, ITS regions of five Erysimum species were sequenced. Erysimum sintenisianum Bornm., E. lazistanicum (Rupr.) Lipsky, and E. stenophyllum Polatschek were sequenced in this study for the first time. The diagnostic morphological and phylogenetic characteristics are discussed with similar species. SEM images of trichomes on different parts of siliqua, stigma, and seed are given. Chromosome number of the new species is found to be 2n=16.

A review of the nematode genus Labiobulura (Ascaridida: Subuluridae) parasitic in bandicoots (Peramelidae) and bilbies (Thylocomyidae) from Australia and rodents (Murinae: Hydromyini) from Papua New Guinea with the description of two new species

Zootaxa ◽  
2009 ◽  
Vol 2209 (1) ◽  
pp. 1-27 ◽  
Author(s):  
LESLEY R. SMALES
Keyword(s):  
Papua New Guinea ◽  
Host Species ◽  
Parasite Species ◽  
Mouth Opening ◽  
New Guinea ◽  
Nematode Genus ◽  
Two New Species ◽  
Single Host ◽  
First Time ◽  
The Relationship

The nematode genus Labiobulura Skrjabin & Schikhobalova, presently known from bandicoots (Isoodon Desmarest and Perameles Geoffroy), and bilbies (Macrotis Reid) from Australia and rodents (Leptomys Thomas) from Papua New Guinea is revised. Diagnoses of Labiobulura, Labiobulura (Archeobulura) Quentin and Labiobulura (Labiobulura) Quentin and a key to all species of the genus are given. Five species are redescribed: L. (A.) leptomyidis Smales from L. paulus Musser, Helgen & Lunde, L. (A.) peragale Johnston & Mawson from M. leucura (Thomas), L. (L.) baylisi Mawson from I. macrourus (Gould) and P. nasuta Geoffroy, L. (L.) inglisi Mawson from I. obesulus (Shaw), P. bougainville Quoy & Gaimard and P. gunnii Gray, L. (L.) peramelis Baylis from I. macrourus and two are described as new: L. (A.) perditus from P. bougainville, L. (L.) quentini from I. obesulus and the identification of the hosts determined. The significance of the relationship between the placement of the amphids and cephalic papillae and the labial lobes is discussed and the denticles surrounding the mouth opening in the sub genus Labiobulura are described, both for the first time. There is evidence for host specificity in the Archeobulura with each parasite species limited to a single host species but less so for the Labiobulura with three of five species found in more than one host species.

Host specificity is linked to intraspecific variability in the genus Lamellodiscus (Monogenea)

Parasitology ◽  
2008 ◽  
Vol 135 (5) ◽  
pp. 607-616 ◽  
Author(s):  
T. KACI-CHAOUCH ◽  
O. VERNEAU ◽  
Y. DESDEVISES
Keyword(s):  
Host Specificity ◽  
Host Species ◽  
Intraspecific Variability ◽  
Principal Component ◽  
Relative Increase ◽  
Fish Parasites ◽  
Nuclear Ribosomal Dna ◽  
New Host ◽  
Morphometric Characters ◽  
Generalist Species

SUMMARYWe investigated whether host specificity is linked to variability within species of Lamellodiscus monogeneans, which are gill ectoparasites of the Sparidae. We sampled fish parasites in the northeastern part of the Mediterranean Sea: 4 specialist species, using 1 single host species, and 3 generalist species, using 2 distinct host species. Intraspecific variability was assessed from 2 different datasets. Morphometric variability of the attachment organ, called the haptor, was estimated first from measurements of several sclerified haptoral parts on 102 individuals. Genetic variability was calculated based on comparisons of sequences derived from the first internal transcribed spacer (ITS-1) of nuclear ribosomal DNA of 62 individuals. Morphometric variances in the specialist versus generalist species were compared via principal component analysis and F-tests, and uncorrected genetic distances (p-distances) were estimated within each species. We showed that the inter-individual variance of morphometric characters, as well as p-distances, are clearly greater within generalist species than specialist ones. These findings suggest that a relative increase in morphological and molecular variability enhances the possibility to colonize new host species in monogeneans, and supports the hypothesis that intraspecific variability could be a potential determinant of host specificity.

scholarly journals The recent colonization history of the most widespread Podocarpus tree species in Afromontane forests

2020 ◽  
Vol 126 (1) ◽  
pp. 73-83
Author(s):  
Jérémy Migliore ◽  
Anne-Marie Lézine ◽  
Olivier J Hardy
Keyword(s):  
Dna Sequences ◽  
Demographic History ◽  
Central Africa ◽  
Single Species ◽  
High Elevation ◽  
Nuclear Ribosomal Dna ◽  
Afromontane Forests ◽  
Wide Range ◽  
History Of ◽  
Sub Saharan

Abstract Background and Aims Afromontane forests host a unique biodiversity distributed in isolated high-elevation habitats within a matrix of rain forests or savannahs, yet they share a remarkable flora that raises questions about past connectivity between currently isolated forests. Here, we focused on the Podocarpus latifolius–P. milanjianus complex (Podocarpaceae), the most widely distributed conifers throughout sub-Saharan African highlands, to infer its demographic history from genetic data. Methods We sequenced the whole plastid genome, mitochondrial DNA regions and nuclear ribosomal DNA of 88 samples from Cameroon to Angola in western Central Africa and from Kenya to the Cape region in eastern and southern Africa to reconstruct time-calibrated phylogenies and perform demographic inferences. Key Results We show that P. latifolius and P. milanjianus form a single species, whose lineages diverged during the Pleistocene, mostly between approx, 200 000 and 300 000 years BP, after which they underwent a wide range expansion leading to their current distributions. Confronting phylogenomic and palaeoecological data, we argue that the species originated in East Africa and reached the highlands of the Atlantic side of Africa through two probable latitudinal migration corridors: a northern one towards the Cameroon volcanic line, and a southern one towards Angola. Although the species is now rare in large parts of its range, no demographic decline was detected, probably because it occurred too recently to have left a genetic signature in our DNA sequences. Conclusions Despite the ancient and highly fluctuating history of podocarps in Africa revealed by palaeobotanical records, the extended distribution of current P. latifolius/milanjianus lineages is shown to result from a more recent history, mostly during the mid-late Pleistocene, when Afromontane forests were once far more widespread and continuous.

scholarly journals Molecular phylogeny and biogeographic history of the Neotropical tribe Glandulocaudini (Characiformes: Characidae: Stevardiinae)

2018 ◽  
Vol 16 (1) ◽  
Author(s):  
Priscila Camelier ◽  
Naércio Aquino Menezes ◽  
Guilherme José Costa-Silva ◽  
Claudio Oliveira
Keyword(s):  
Molecular Clock ◽  
Dna Sequences ◽  
Valid Species ◽  
Molecular Evidence ◽  
Sea Level Fluctuations ◽  
Biogeographic History ◽  
History Of ◽  
Clock Analysis ◽  
First Time ◽  
Atlantic Coastal

ABSTRACT Although former studies on systematics and biogeography represent a progress on the knowledge of the tribe Glandulocaudini, none was grounded on molecular evidence. Thus, the first hypothesis of relationships for the tribe based on a multilocus analysis is presented, including all genera and most of the valid species. DNA sequences of Glandulocauda caerulea and Mimagoniates sylvicola were analyzed for the first time. A molecular clock analysis was used to estimate the origin of the Glandulocaudini and the approximate timing of cladogenetic events within the group. Glandulocaudini was recovered as monophyletic. No hypothesis recovered Glandulocauda as monophyletic, since G. melanopleura is sister to Lophiobrycon weitzmani while G. caerulea is closely related to Mimagoniates. The relationships within the latter genus were resolved. The molecular clock results indicate the origin of the Glandulocaudini during the Miocene with diversification in the group occurring from Neogene to Pleistocene. These results corroborated the hypothesis that its origin took place on the Brazilian crystalline shield with the subsequent occupation of the Atlantic Coastal drainages. Apparently, Pleistocene sea-level fluctuations might have shaped the distribution pattern of some species in Glandulocaudini.

Adam Zalužanský’s “De sexu plantarum” (1592): an early pioneering chapter on plant sexuality

2013 ◽  
Vol 40 (2) ◽  
pp. 244-256 ◽  
Author(s):  
Holger Funk
Keyword(s):  
Nineteenth Century ◽  
English Translation ◽  
History Of Botany ◽  
Main Work ◽  
Botanical History ◽  
History Of ◽  
The University ◽  
First Time

In the history of botany, Adam Zalužanský (d. 1613), a Bohemian physician, apothecary, botanist and professor at the University of Prague, is a little-known personality. Linnaeus's first biographers, for example, only knew Zalužanský from hearsay and suspected he was a native of Poland. This ignorance still pervades botanical history. Zalužanský is mentioned only peripherally or not at all. As late as the nineteenth century, a researcher would be unaware that Zalužanský’s main work Methodi herbariae libri tres actually existed in two editions from two different publishers (1592, Prague; 1604, Frankfurt). This paper introduces the life and work of Zalužanský. Special attention is paid to the chapter “De sexu plantarum” of Zalužanský’s Methodus, in which, more than one hundred years before the well-known De sexu plantarum epistola of R. J. Camerarius, the sexuality of plants is suggested. Additionally, for the first time, an English translation of Zalužanský’s chapter on plant sexuality is provided.

A Confrontation between Two Doctrines: The Birth of Struggle for Hegemony in Hebrew Children's Literature during the 1930s and 1940s

2008 ◽  
Vol 1 (2) ◽  
pp. 139-155 ◽  
Author(s):  
YAEL DARR
Keyword(s):  
Children's Literature ◽  
Educational System ◽  
Single Channel ◽  
Children’S Literature ◽  
The Political ◽  
Literary Creation ◽  
History Of ◽  
High Level ◽  
First Time ◽  
Literary Quality

This article describes a crucial and fundamental stage in the transformation of Hebrew children's literature, during the late 1930s and 1940s, from a single channel of expression to a multi-layered polyphony of models and voices. It claims that for the first time in the history of Hebrew children's literature there took place a doctrinal confrontation between two groups of taste-makers. The article outlines the pedagogical and ideological designs of traditionalist Zionist educators, and suggests how these were challenged by a group of prominent writers of adult poetry, members of the Modernist movement. These writers, it is argued, advocated autonomous literary creation, and insisted on a high level of literary quality. Their intervention not only dramatically changed the repertoire of Hebrew children's literature, but also the rules of literary discourse. The article suggests that, through the Modernists’ polemical efforts, Hebrew children's literature was able to free itself from its position as an apparatus controlled by the political-educational system and to become a dynamic and multi-layered field.

Digging the history. Absolute chronology of the settlement complex at Czermno-Cherven’ (eastern Poland). Research status and perspectives

2020 ◽  
Vol 72 (2) ◽  
Author(s):  
Tomasz Dzieńkowski ◽  
Marcin Wołoszyn ◽  
Iwona Florkiewicz ◽  
Radosław Dobrowolski ◽  
Jan Rodzik ◽  
...  
Keyword(s):  
Interdisciplinary Research ◽  
Qualitative Change ◽  
Archaeological Research ◽  
Research Status ◽  
History Of ◽  
Absolute Dating ◽  
First Time ◽  
Radiocarbon Datings

The article discusses the results of the latest interdisciplinary research of Czermno stronghold and its immediate surroundings. The site is mentioned in chroniclers’ entries referring to the stronghold Cherven’ (Tale of Bygone Years, first mention under the year 981) and the so-called Cherven’ Towns. Given the scarcity of written records regarding the history of today’s Eastern Poland, Ukraine, and Belarus in the 10th and 11th centuries, recent archaeological research, supported by geoenvironmental analyses and absolute dating, brought a significant qualitative change. In 2014 and 2015, the remains of the oldest rampart of the stronghold were uncovered for the first time. A series of radiocarbon datings allows us to refer the erection of the stronghold to the second half/late 10th century. The results of several years’ interdisciplinary research (2012-2020) introduce qualitatively new data to the issue of the Cherven’ Towns, which both change current considerations and confirm the extraordinary research potential in the archeology of the discussed region.

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