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University (12)Research Institution (2)
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Publication
ID32586956Published Date2020-07-14JournalProceedings of the National Academy of Sciences of the United States of America, 2020-07-14, Volume 117
Extreme environments test the limits of life; yet, some organisms thrive in harsh conditions. Extremophile lineages inspire questions about how organisms can tolerate physiochemical stressors and whether the repeated colonization of extreme environments is facilitated by predictable and repeatable evolutionary innovations. We identified the mechanistic basis underlying convergent evolution of tolerance to hydrogen sulfide (HS)-a toxicant that impairs mitochondrial function-across evolutionari…
Publication
IDCSHL:2020.02.24.959916Published Date2020-02-25JournalbioRxiv, 2020-02-25
Extreme environments test the limits of life; yet, some organisms thrive in harsh conditions. Extremophile lineages inspire questions about how organisms can tolerate physiochemical stressors and whether the repeated colonization of extreme environments is facilitated by predictable and repeatable evolutionary innovations. We identified the mechanistic basis underlying convergent evolution of tolerance to hydrogen sulfide (H2S)—a toxicant that impairs mitochondrial function—across evolutionar…
Publication
ID31004483Published Date2019-10-01JournalIntegrative and comparative biology, 2019-10-01, Volume 59
Mitochondria have been known to be involved in speciation through the generation of Dobzhansky-Muller incompatibilities, where functionally neutral co-evolution between mitochondrial and nuclear genomes can cause dysfunction when alleles are recombined in hybrids. We propose that adaptive mitochondrial divergence between populations can not only produce intrinsic (Dobzhansky-Muller) incompatibilities, but could also contribute to reproductive isolation through natural and sexual selection aga…
Publication
ID31504533Published Date2019-10-01JournalIntegrative and comparative biology, 2019-10-01, Volume 59
Eukaryotes are the outcome of an ancient symbiosis and as such, eukaryotic cells fundamentally possess two genomes. As a consequence, gene products encoded by both nuclear and mitochondrial genomes must interact in an intimate and precise fashion to enable aerobic respiration in eukaryotes. This genomic architecture of eukaryotes is proposed to necessitate perpetual coevolution between the nuclear and mitochondrial genomes to maintain coadaptation, but the presence of two genomes also creates…
Publication
ID31154969Published Date2019-07-22JournalPhilosophical transactions of the Royal Society of London. Series B, Biological sciences, 2019-07-22, Volume 374
The molecular basis of convergent phenotypes is often unknown. However, convergence at a genomic level is predicted when there are large population sizes, gene flow among diverging lineages or strong genetic constraints. We used whole-genome resequencing to investigate genomic convergence in fishes ( Poecilia spp.) that have repeatedly colonized hydrogen sulfide (HS)-rich environments in Mexico. We identified genomic similarities in both single nucleotide polymorphisms (SNPs) and structural v…
Publication
ID30989642Published Date2019-06-01JournalEvolution; international journal of organic evolution, 2019-06-01, Volume 73
Divergence of genital traits among lineages has the potential to serve as a reproductive isolating barrier when copulation, insemination, and fertilization are inhibited by incompatibilities between female and male genitalia. Despite widespread evidence for genital trait diversity among closely related lineages and coevolution of female and male genitalia within lineages, few studies have investigated genital evolution during the early stages of speciation. We quantified genital variation in …
Publication
ID29227751Published Date2018-04-01JournalGenome, 2018-04-01, Volume 61
Hydrogen sulfide (HS) is a natural toxicant in some aquatic environments that has diverse molecular targets. It binds to oxygen transport proteins, rendering them non-functional by reducing oxygen-binding affinity. Hence, organisms permanently inhabiting HS-rich environments are predicted to exhibit adaptive modifications to compensate for the reduced capacity to transport oxygen. We investigated 10 lineages of fish of the family Poeciliidae that have colonized freshwater springs rich in HS-a…
Publication
ID28731545Published Date2017-10-01JournalMolecular ecology, 2017-10-01, Volume 26
Populations with limited ranges can be highly vulnerable to changes in their environment and are, thus, of high conservation concern. Populations that experience human-induced range reductions are often highly inbred and lack genetic diversity, but it is unknown whether this is also the case for populations with naturally small ranges. The fishes Poecilia sulphuraria (listed as critically endangered) and Poecilia thermalis, which are endemic to small hydrogen sulphide-rich springs in southern…
Publication
ID27718237Published Date2016-12-01JournalEvolution; international journal of organic evolution, 2016-12-01, Volume 70
Assortative mating is critical for reproductive isolation during speciation; however, the mechanisms underlying mating preferences are often unknown. Assortative mating can be mediated through preferences for condition-dependent and adaptive ("magic") traits, but rigorously testing these hypotheses has been impeded by trait covariation in living organisms. We used computer-generated models to examine the role of body shape in producing association preferences between fish populations undergoi…
Publication
ID26052634Published Date2015-07-01JournalPhysiological and biochemical zoology : PBZ, 2015-07-01, Volume 88
Variation in energy availability or maintenance costs in extreme environments can exert selection for efficient energy use, and reductions in organismal energy demand can be achieved in two ways: reducing body mass or metabolic suppression. Whether long-term exposure to extreme environmental conditions drives adaptive shifts in body mass or metabolic rates remains an open question. We studied body size variation and variation in routine metabolic rates in locally adapted populations of extrem…
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Publications: 12

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