scholarly journals Parasitoids as vectors of facultative bacterial endosymbionts in aphids

2012 ◽  
Vol 8 (4) ◽  
pp. 613-615 ◽  
Author(s):  
Lukas Gehrer ◽  
Christoph Vorburger
Keyword(s):  
Horizontal Transmission ◽  
Aphis Fabae ◽  
Diagnostic Pcr ◽  
Sexual Generation ◽  
Bacterial Endosymbionts ◽  
Symbiont Transmission ◽  
Hamiltonella Defensa ◽  
The Many ◽  
First Time ◽  
Male To Female

Heritable bacterial endosymbionts play an important role in aphid ecology. Sequence-based evidence suggests that facultative symbionts such as Hamiltonella defensa or Regiella insecticola also undergo horizontal transmission. Other than through male-to-female transfer during the sexual generation in autumn, the routes by which this occurs remain largely unknown. Here, we tested if parasitoids or ectoparasitic mites can act as vectors for horizontal transfer of facultative symbionts. Using symbiont-specific primers for diagnostic PCR, we demonstrate for the first time, to our knowledge, that parasitoids can indeed transfer H. defensa and R. insecticola by sequentially stabbing infected and uninfected individuals of their host, Aphis fabae , establishing new, heritable infections. Thus, a natural route of horizontal symbiont transmission is also available during the many clonal generations of the aphid life cycle. No transmissions by ectoparasitic mites were observed, nor did parasitoids that emerged from symbiont-infected aphids transfer any symbionts in our experiments.

scholarly journals Host-switching by a vertically transmitted rhabdovirus in Drosophila

2011 ◽  
Vol 7 (5) ◽  
pp. 747-750 ◽  
Author(s):  
Ben Longdon ◽  
Lena Wilfert ◽  
Jewelna Osei-Poku ◽  
Heather Cagney ◽  
Darren J. Obbard ◽  
...  
Keyword(s):  
Evolutionary History ◽  
Sequence Data ◽  
Horizontal Transmission ◽  
Virus Infections ◽  
Diverse Range ◽  
Host Fidelity ◽  
Bacterial Endosymbionts ◽  
Host Lineage ◽  
Sigma Virus ◽  
First Time

A diverse range of endosymbionts are found within the cells of animals. As these endosymbionts are normally vertically transmitted, we might expect their evolutionary history to be dominated by host-fidelity and cospeciation with the host. However, studies of bacterial endosymbionts have shown that while this is true for some mutualists, parasites often move horizontally between host lineages over evolutionary timescales. For the first time, to our knowledge, we have investigated whether this is also the case for vertically transmitted viruses. Here, we describe four new sigma viruses, a group of vertically transmitted rhabdoviruses previously known in Drosophila . Using sequence data from these new viruses, and the previously described sigma viruses, we show that they have switched between hosts during their evolutionary history. Our results suggest that sigma virus infections may be short-lived in a given host lineage, so that their long-term persistence relies on rare horizontal transmission events between hosts.

scholarly journals A strain of the bacterial symbiont Regiella insecticola protects aphids against parasitoids

2009 ◽  
Vol 6 (1) ◽  
pp. 109-111 ◽  
Author(s):  
Christoph Vorburger ◽  
Lukas Gehrer ◽  
Paula Rodriguez
Keyword(s):  
Aphid Species ◽  
Aphis Fabae ◽  
Potato Aphid ◽  
Aphidius Colemani ◽  
Endosymbiotic Bacteria ◽  
Bacterial Endosymbionts ◽  
Hamiltonella Defensa ◽  
Serratia Symbiotica ◽  
Multiple Species ◽  
Peach Potato Aphid

Aphids commonly harbour facultative bacterial endosymbionts and may benefit from their presence through increased resistance to parasitoids. This has been demonstrated for Hamiltonella defensa and Serratia symbiotica , while a third common endosymbiont, Regiella insecticola , did not provide such protection. However, this symbiont was recently detected in a highly resistant clone of the peach-potato aphid, Myzus persicae , from Australia. To test if resistance was indeed conferred by the endosymbiont, we eliminated it from this clone with antibiotics, and we transferred it to two other clones of the same and one clone of a different aphid species ( Aphis fabae ). Exposing these lines to the parasitoid Aphidius colemani showed clearly that unlike other strains of this bacterium, this specific isolate of R. insecticola provides strong protection against parasitic wasps, suggesting that the ability to protect their host against natural enemies may evolve readily in multiple species of endosymbiotic bacteria.

scholarly journals Horizontal Transmission of the Heritable Protective Endosymbiont Hamiltonella defensa Depends on Titre and Haplotype

2021 ◽  
Vol 11 ◽  
Author(s):  
Heidi Kaech ◽  
Christoph Vorburger
Keyword(s):  
Natural Enemies ◽  
Horizontal Transmission ◽  
Aphis Fabae ◽  
Parasitoid Wasps ◽  
High Cell ◽  
Transmission Success ◽  
Hamiltonella Defensa ◽  
Cell Densities ◽  
Haplotype 1 ◽  
Secondary Endosymbiont

Secondary endosymbionts of aphids have an important ecological and evolutionary impact on their host, as they provide resistance to natural enemies but also reduce the host’s lifespan and reproduction. While secondary symbionts of aphids are faithfully transmitted from mother to offspring, they also have some capacity to be transmitted horizontally between aphids. Here we explore whether 11 isolates from 3 haplotypes of the secondary endosymbiont Hamiltonella defensa differ in their capacity for horizontal transmission. These isolates vary in the protection they provide against parasitoid wasps as well as the costs they inflict on their host, Aphis fabae. We simulated natural horizontal transmission through parasitoid wasps by stabbing aphids with a thin needle and assessed horizontal transmission success of the isolates from one shared donor clone into three different recipient clones. Specifically, we asked whether potentially costly isolates reaching high cell densities in aphid hosts are more readily transmitted through this route. This hypothesis was only partially supported. While transmissibility increased with titre for isolates from two haplotypes, isolates of the H. defensa haplotype 1 were transmitted with greater frequency than isolates of other haplotypes with comparable titres. Thus, it is not sufficient to be merely frequent—endosymbionts might have to evolve specific adaptations to transmit effectively between hosts.

Unrivalled Influence

2013 ◽  
Author(s):  
Judith Herrin
Keyword(s):  
Political Life ◽  
General Introduction ◽  
Women And Gender ◽  
Mothers And Daughters ◽  
Diverse Range ◽  
Long Span ◽  
Imperial Court ◽  
And Gender ◽  
The Many ◽  
First Time

This book explores the exceptional roles that women played in the vibrant cultural and political life of medieval Byzantium. This book evokes the complex and exotic world of Byzantium's women, from empresses and saints to uneducated rural widows. Drawing on a diverse range of sources, the book sheds light on the importance of marriage in imperial statecraft, the tense coexistence of empresses in the imperial court, and the critical relationships of mothers and daughters. It looks at women's interactions with eunuchs, the in-between gender in Byzantine society, and shows how women defended their rights to hold land. The book describes how women controlled their inheritances, participated in urban crowds demanding the dismissal of corrupt officials, followed the processions of holy icons and relics, and marked religious feasts with liturgical celebrations, market activity, and holiday pleasures. The vivid portraits that emerge here reveal how women exerted an unrivalled influence on the patriarchal society of Byzantium, and remained active participants in the many changes that occurred throughout the empire's millennial history. The book brings together the author's finest essays on women and gender written throughout the long span of her career. This volume includes three new essays published here for the very first time and a new general introduction. It also provides a concise introduction to each essay that describes how it came to be written and how it fits into her broader views about women and Byzantium.

Telluride and After

2021 ◽  
Vol 75 (2) ◽  
pp. 102-108
Author(s):  
B. Ruby Rich
Keyword(s):  
New York ◽  
Film Festival ◽  
Center Stage ◽  
Kenneth Branagh ◽  
Todd Haynes ◽  
Telluride Film ◽  
Velvet Underground ◽  
The Many ◽  
First Time

FQ editor-in-chief B. Ruby Rich reports from the 48th edition of the Telluride Film Festival. Unlike most of its peer festivals, Telluride opted not to hold a virtual edition in 2020, a decision entirely in keeping with its emphasis on the tactile and experiential aspects of cinema, and which made its return in 2021 all the more giddy for first-time attendees and long-term devotees alike. Rich reviews the many festival highlights, from Jane Campion’s reinvention of the Western in The Power of the Dog to Todd Haynes’ archival documentary The Velvet Underground. Childhood takes center stage in new films from Céline Sciamma and Kenneth Branagh while misunderstood masculinity emerges as a theme in Michael Pearce’s Encounter, Asghar Farhadi’s A Hero, and Mike Mills’s C’mon C’mon. Including a coda on the New York Film Festival, Rich concludes that the masterful riches of the two festivals augur well for the fall 2021 season.

scholarly journals Changes in Endosymbiont Complexity Drive Host-Level Compensatory Adaptations in Cicadas

mBio ◽  
2018 ◽  
Vol 9 (6) ◽  
Author(s):  
Matthew A. Campbell ◽  
Piotr Łukasik ◽  
Mariah C. Meyer ◽  
Mark Buckner ◽  
Chris Simon ◽  
...  
Keyword(s):  
Potential Problem ◽  
Transmission Mechanism ◽  
Endosymbiotic Bacterium ◽  
Original Function ◽  
Full Complement ◽  
Bacterial Endosymbionts ◽  
Symbiont Transmission ◽  
Sap Feeding ◽  
To Receive ◽  
Splitting Process

ABSTRACTFor insects that depend on one or more bacterial endosymbionts for survival, it is critical that these bacteria are faithfully transmitted between insect generations. Cicadas harbor two essential bacterial endosymbionts, “CandidatusSulcia muelleri” and “CandidatusHodgkinia cicadicola.” In some cicada species,Hodgkiniahas fragmented into multiple distinct but interdependent cellular and genomic lineages that can differ in abundance by more than two orders of magnitude. This complexity presents a potential problem for the host cicada, because low-abundance but essentialHodgkinialineages risk being lost during the symbiont transmission bottleneck from mother to egg. Here we show that all cicada eggs seem to receive the full complement ofHodgkinialineages, and that in cicadas with more complexHodgkiniathis outcome is achieved by increasing the number ofHodgkiniacells transmitted by up to 6-fold. We further show that cicada species with varyingHodgkiniacomplexity do not visibly alter their transmission mechanism at the resolution of cell biological structures. Together these data suggest that a major cicada adaptation to changes in endosymbiont complexity is an increase in the number ofHodgkiniacells transmitted to each egg. We hypothesize that the requirement to increase the symbiont titer is one of the costs associated withHodgkiniafragmentation.IMPORTANCESap-feeding insects critically rely on one or more bacteria or fungi to provide essential nutrients that are not available at sufficient levels in their diets. These microbes are passed between insect generations when the mother places a small packet of microbes into each of her eggs before it is laid. We have previously described an unusual lineage fragmentation process in a nutritional endosymbiotic bacterium of cicadas calledHodgkinia. In some cicadas, a singleHodgkinialineage has split into numerous related lineages, each performing a subset of original function and therefore each required for normal host function. Here we test how this splitting process affects symbiont transmission to eggs. We find that cicadas dramatically increase the titer ofHodgkiniacells passed to each egg in response to lineage fragmentation, and we hypothesize that this increase in bacterial cell count is one of the major costs associated with endosymbiont fragmentation.

scholarly journals ISMB 2003 Bio-ontologies SIG and Sixth Annual Bio-ontologies Meeting Report

2003 ◽  
Vol 4 (6) ◽  
pp. 663-666 ◽  
Author(s):  
Phillip Lord ◽  
Robert Stevens
Keyword(s):  
North America ◽  
Peer Review ◽  
Interest Group ◽  
Text Analysis ◽  
Special Interest ◽  
Text Processing ◽  
Global Politics ◽  
Meeting Report ◽  
The Many ◽  
First Time

The Annual Bio-Ontologies meeting (http://www.cs.man.ac.uk/˜stevens/meeting03/) has now been running for 6 consecutive years, as a special interest group (SIG) of the much larger ISMB conference. It met in Brisbane, Australia, this summer, the first time it was held outside North America or Europe. The bio-ontologies meeting is 1 day long and normally has around 100 attendees. This year there were many fewer, no doubt a result of the distance, global politics and SARS. The meeting consisted of a series of 30 min talks with no formal peer review or publication. Talks ranged in style from fairly formal and complete pieces of work, through works in progress, to the very informal and discursive. Each year's meeting has a theme and this year it was ‘ontologies, and text processing’. There is a tendency for those submitting talks to ignore the theme completely, but this year's theme obviously struck a chord, as half the programme was about ontologies and text analysis (http://www.cs.man.ac.uk/˜stevensr/meeting03/programme.html). Despite the smaller size of the meeting, the programme was particularly strong this year, meaning that the tension between allowing time for the many excellent talks, discussion and questions from the floor was particular keenly felt. A happy problem to have!

scholarly journals Work: An Occupational ABC by K. Hatanaka

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Debbie Feisst
Keyword(s):  
Young Adult ◽  
Young Children ◽  
Short Description ◽  
Young Adult Fiction ◽  
University Of Alberta ◽  
Full Page ◽  
Coffee Table ◽  
The Many ◽  
The University ◽  
First Time

Hatanaka, Kellen. Work: An Occupational ABC. Toronto: Groundwood Books, 2014. Print.At first glance, you may look at this book and think it just like the myriad of other ABC books for young children and preschoolers, but you would be delightfully wrong!  Yes, of course, each letter from A to Z is represented and indeed each letter is accompanied by an image that characterizes the letter.  But that is where the similarities end. Toronto-based designer, illustrator and artist Kellen Hatanaka, who can now also call himself a first time author, has created a beautiful and unexpected piece of art for the youngest readers and it is as much a delight to read as it is to behold.  With creamy paper and softly-coloured images, created digitally after first creating ‘hand-drawn patterns and images’, it is reminiscent of a small person’s version of a coffee table book, if said coffee table were in a nursery.It starts out simple enough, with A for Aviator and a full page spread with a boldly-coloured A as well as mountain tops that echo the A’s shape.  The next page, however, alerts the reader to the fun in store – B is for Butcher, shown chasing after a group of raccoons who have absconded with a string of sausages. Yes, there are occupations like Grocer and Tailor but there are also the Ice Cream Vendor, K-9 Officer and the Wedding Singer! What’s wonderful to note are the many alternative occupations, some that you may have not have heard of, and that there is a nice mix of women, men, and cultures taking part. For the curious reader, there is a section of funny ‘Want Ads’ which provides a short description of the occupation.This would make a wonderful new baby gift and is an excellent addition to a home or public library.Highly recommended: 4 stars out of 4 Reviewer: Debbie FeisstDebbie is a Public Services Librarian at the H.T. Coutts Education Library at the University of Alberta.  When not renovating, she enjoys travel, fitness and young adult fiction.

scholarly journals The First Record of Adult Spotted Sea Bass (Lateolabrax maculatus, McClelland, 1844) from the Coastal Waters of Quang Ninh Province, Vietnam

2021 ◽  
Vol 4 (1) ◽  
pp. 946-954
Author(s):  
Nguyen Van Giang ◽  
Phan Thanh Nghi ◽  
Nguyen Bich Hanh
Keyword(s):  
National Park ◽  
Sea Bass ◽  
First Record ◽  
16S Rdna Sequence ◽  
Black Spots ◽  
Lateolabrax Maculatus ◽  
Mature Fish ◽  
The Many ◽  
First Time ◽  
Quang Ninh

Spotted sea bass (Lateolabrax maculatus, McClelland, 1844) is a species belonging to the genus Lateolabrax (Lateolabracidae), and is characterized by the many distinct black spots on the bodies of mature fish. For the first time, six specimens have been recorded in Quang Ninh province. The specimens were collected from Luon Cave in Bai Tu Long National Park in May-June 2019. The new specimens collected from Quang Ninh, Vietnam are different from the recorded specimens from Japan, Korea, Taiwan, and China in terms of lateral line scales (LLS) as the samples collected in Quang Ninh, Vietnam have 94-97 scales and the samples collected from the other countries have 66-82 scales. Phylogenetic analysis of the 16S rDNA sequence confirmed that all of the samples collected in Quang Ninh, Vietnam belonged to the species of spotted sea bass.

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