Journal Article10.1111/J.1365-294X.2006.03073.X
Population structure between environmentally transmitted vibrios and bobtail squids using nested clade analysis.
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TL;DR: This study examined the variation and history of three allopatric Euprymna squid species and their respective Vibrio symbionts to highlight the importance of how interactions between symbiotic organisms can unexpectedly shape population structure in phylogeographical studies.
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Abstract: Squids from the genus Euprymna (Cephalopoda: Sepiolidae) and their symbiotic bacteria Vibrio fischeri form a mutualism in which vibrios inhabit a complex light organ within the squid host. A host-mediated daily expulsion event seeds surrounding seawater with symbiotically capable V. fischeri that environmentally colonize newly hatched axenic Euprymna juveniles. Competition experiments using native and non-native Vibrio have shown that this expulsion/re-colonization phenomenon has led to cospeciation in this system in the Pacific Ocean; however, the genetic architecture of these symbiotic populations has not been determined. Using genetic diversity and nested clade analyses we have examined the variation and history of three allopatric Euprymna squid species (E. scolopes of Hawaii, E. hyllebergi of Thailand, and E. tasmanica from Australia) and their respective Vibrio symbionts. Euprymna populations appear to be very genetically distinct from each other, exhibiting little or no migration over large geographical distances. In contrast, Vibrio symbiont populations contain more diverse haplotypes, suggesting both host presence and unidentified factors facilitating long-distance migration structure in Pacific Vibrio populations. Findings from this study highlight the importance of how interactions between symbiotic organisms can unexpectedly shape population structure in phylogeographical studies.
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Twenty years of phylogeography: the state of the field and the challenges for the Southern Hemisphere.
TL;DR: This review presents a numerical synthesis of the phylogeography literature based on an examination of over 3000 articles published during the first 20 years of the field, and argues that the intellectual maturation of this field will eventually depend not only on developments in DNA technology, theory and statistical analysis, but also on syntheses of comparative information across different regions of the globe.
Evolutionary genetics of a defensive facultative symbiont of insects: exchange of toxin-encoding bacteriophage.
Patrick H. Degnan,Nancy A. Moran +1 more
TL;DR: In this article, a multilocus sequence analysis of 10 bacterial and five phage loci for strains isolated from A. pisum and other aphid species was performed to generate a well-resolved H. defensa strain phylogeny.
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New bobtail squid (Sepiolidae: Sepiolinae) from the Ryukyu islands revealed by molecular and morphological analysis
Gustavo Sanchez,Jeffrey Jolly,Amanda Reid,Chikatoshi Sugimoto,Chika Azama,Ferdinand Marlétaz,Oleg Simakov,Oleg Simakov,Daniel S. Rokhsar +8 more
- 11 Dec 2019
TL;DR: Three species of bobtail squid from the Ryukyu archipelago are described, one of these species was a previously unknown bobtail squid from the genus Euprymna, the second is reassigned to the genus Humboldt, and the third species is closely related to another bobtail Squid endemic from Australia and East Timor.
Salinity and Temperature Effects on Physiological Responses of Vibrio fischeri from Diverse Ecological Niches
TL;DR: Abiotic factors such as temperature and salinity have differential effects between free-living and symbiotic strains of V. fischeri, which may alter colonization efficiency prior to infection.
The evolutionary ecology of a sepiolid squid-vibrio association: from cell to environment
Spencer V. Nyholm,M.K. Nishiguchi +1 more
- 01 Jan 2008
TL;DR: This work examines the transition between these forces effecting the symbiosis between sepiolid squids and Vibrio bacteria, and poses possible explanations as to why this association offers many attributes for understanding the role of symbiotic competence.
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