| genome expansion via lineage splitting and genome reduction in the cicada endosymbiont hodgkinia. | comparative genomics from mitochondria, plastids, and mutualistic endosymbiotic bacteria has shown that the stable establishment of a bacterium in a host cell results in genome reduction. although many highly reduced genomes from endosymbiotic bacteria are stable in gene content and genome structure, organelle genomes are sometimes characterized by dramatic structural diversity. previous results from candidatus hodgkinia cicadicola, an endosymbiont of cicadas, revealed that some lineages of this ... | 2015 | 26286984 |
| independent divergence of 13- and 17-y life cycles among three periodical cicada lineages. | the evolution of 13- and 17-y periodical cicadas (magicicada) is enigmatic because at any given location, up to three distinct species groups (decim, cassini, decula) with synchronized life cycles are involved. each species group is divided into one 13- and one 17-y species with the exception of the decim group, which contains two 13-y species-13-y species are magicicada tredecim, magicicada neotredecim, magicicada tredecassini, and magicicada tredecula; and 17-y species are magicicada septendec ... | 2013 | 23509294 |
| reconstructing asymmetrical reproductive character displacement in a periodical cicada contact zone. | selection against costly reproductive interactions can lead to reproductive character displacement (rcd). we use information from patterns of displacement and inferences about predisplacement character states to investigate causes of rcd in periodical cicadas. the 13-year periodical cicada magicicada neotredecim exhibits rcd and strong reproductive isolation in sympatry with a closely related 13-year species, magicicada tredecim. displacement is asymmetrical, because no corresponding pattern of ... | 2006 | 16674582 |
| idiosyncratic genome degradation in a bacterial endosymbiont of periodical cicadas. | when a free-living bacterium transitions to a host-beneficial endosymbiotic lifestyle, it almost invariably loses a large fraction of its genome [1, 2]. the resulting small genomes often become stable in size, structure, and coding capacity [3-5], as exemplified by sulcia muelleri, a nutritional endosymbiont of cicadas. sulcia's partner endosymbiont, hodgkinia cicadicola, similarly remains co-linear in some cicadas diverged by millions of years [6, 7]. but in the long-lived periodical cicada mag ... | 2017 | 29129532 |
| genomic divergence and lack of introgressive hybridization between two 13-year periodical cicadas support life cycle switching in the face of climate change. | life history evolution spurred by post-pleistocene climatic change is hypothesized to be responsible for the present diversity in periodical cicadas (magicicada), but the mechanism of life cycle change has been controversial. to understand the divergence process of 13-year and 17-year cicada life cycles, we studied genetic relationships between two synchronously emerging, parapatric 13-year periodical cicada species in the decim group, magicicada tredecim and m. neotredecim. the latter was hypot ... | 2016 | 27661077 |
| geographic body size variation in the periodical cicadas magicicada: implications for life cycle divergence and local adaptation. | seven species in three species groups (decim, cassini and decula) of periodical cicadas (magicicada) occupy a wide latitudinal range in the eastern united states. to clarify how adult body size, a key trait affecting fitness, varies geographically with climate conditions and life cycle, we analysed the relationships of population mean head width to geographic variables (latitude, longitude, altitude), habitat annual mean temperature (amt), life cycle and species differences. within species, body ... | 2015 | 25975714 |