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(BMC Evol Biol[TA])
3,445 results
  • The phylogeny of fossil whip spiders. [Journal Article]
  • BEBMC Evol Biol 2017 Apr 21; 17(1):105
  • Garwood RJ, Dunlop JA, … Hegna TA
  • CONCLUSIONS: Our data suggest that Graeophonus is a crown group amblypygid, and falls within a monophyletic Paleoamblypgi clade, but outside the family Paracharontidae (= Paracharonopsis + Paracharon). Our results also suggest a new placement for the Burmese amber genus Kronocharon, a node further down from its original position. Overall, we offer a broad phylogenetic framework for both the fossil and Recent whip spiders against which future discoveries can be tested.
  • Karyotypic evolution of the Medicago complex: sativa-caerulea-falcata inferred from comparative cytogenetic analysis. [Journal Article]
  • BEBMC Evol Biol 2017 Apr 21; 17(1):104
  • Yu F, Wang H, … Wang T
  • CONCLUSIONS: The comparative cytogenetic results provide reliable evidence that diploid subspecies caerulea is the direct progenitor of tetraploid subspecies sativa. And autotetraploid ssp. sativa has been suggested to undergo a partial diploidization by the progressive accumulation of chromosome structural rearrangements during evolution. However, the tetraploid subspecies falcata is far from a simple autopolyploid from diploid subspecies falcata although no obvious morphological change was observed between these two subspecies.
  • Fitness costs of symbiont switching using entomopathogenic nematodes as a model. [Journal Article]
  • BEBMC Evol Biol 2017 Apr 17; 17(1):100
  • McMullen JG, Peterson BF, … Stock SP
  • CONCLUSIONS: Steinernema-Xenorhabdus symbioses are tightly governed by partner recognition and fidelity. Association with non-cognates resulted in decreased fitness, virulence, and bacterial carriage of the nematode-bacterial pairings. Entomopathogenic nematodes and their bacterial symbionts are a useful, tractable, and reliable model for testing hypotheses regarding the evolution, maintenance, persistence, and fate of mutualisms.
  • Testosterone, territorial response, and song in seasonally breeding tropical and temperate stonechats. [Journal Article]
  • BEBMC Evol Biol 2017 Apr 17; 17(1):101
  • Apfelbeck B, Mortega KG, … Helm B
  • CONCLUSIONS: The results suggest a very similar role for testosterone as a mediator of high intensity territorial aggression during the fertile period of females in tropical and temperate stonechats, which all are highly seasonal, locally synchronous breeders. A potential explanation may be high risk of extra-pair copulations which has been associated with synchronous breeding. Interestingly, an association was not consistent for song performance. Our data suggest that song performance can be disassociated from peak testosterone levels depending on its role in breeding behavior. Despite similar testosterone levels, European males, which early in the breeding season acquire territories and mates, showed greater song performance than African stonechats, which maintain year-round territories and pair-bonds. Taken together, our study comparing related taxa of old world songbirds suggests that short breeding seasons may be a major selective force for high peak testosterone levels during breeding regardless of latitude and pace of life, but that particular behaviors, in our case song, can be uncoupled from peak testosterone levels.
  • Natural selection drove metabolic specialization of the chromatophore in Paulinella chromatophora. [Journal Article]
  • BEBMC Evol Biol 2017 Apr 14; 17(1):99
  • Valadez-Cano C, Olivares-Hernández R, … Delaye L
  • CONCLUSIONS: Our evolutionary analysis suggests that in the case of Paulinella chromatophora natural selection at the holobiont level played a prominent role in shaping the metabolic specialization of the chromatophore. We propose that natural selection acted as a "metabolic engineer" by favoring metabolic restructurings that led to an increased release of reduced-carbon to the host.
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