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Trait evolution

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https://www.readbyqxmd.com/read/28649342/the-relative-contribution-of-drift-and-selection-to-phenotypic-divergence-a-test-case-using-the-horseshoe-bats-rhinolophus-simulator-and-rhinolophus-swinnyi
#1
Gregory L Mutumi, David S Jacobs, Henning Winker
Natural selection and drift can act on populations individually, simultaneously or in tandem and our understanding of phenotypic divergence depends on our ability to recognize the contribution of each. According to the quantitative theory of evolution, if an organism has diversified through neutral evolutionary processes (mutation and drift), variation of phenotypic characteristics between different geographic localities (B) should be directly proportional to the variation within localities (W), that is, B ∝ W...
June 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28649331/novel-approach-to-heritability-detection-suggests-robustness-to-paternal-genotype-in-a-complex-morphological-trait
#2
Max E Winston, Andrea Thompson, Gabriel Trujillo, Andrew T Burchill, Corrie S Moreau
Heritable variation is essential for evolution by natural selection. In Neotropical army ants, the ecological role of a given species is linked intimately to the morphological variation within the sterile worker caste. Furthermore, the army ant Eciton burchellii is highly polyandrous, presenting a unique opportunity to explore heritability of morphological traits among related workers sharing the same colonial environment. In order to exploit the features of this organismal system, we generated a large genetic and morphological dataset and applied our new method that employs geometric morphometrics (GM) to detect the heritability of complex morphological traits...
June 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28649329/food-availability-as-a-major-driver-in-the-evolution-of-life-history-strategies-of-sibling-species
#3
Raphaël Arlettaz, Philippe Christe, Michael Schaub
Life-history theory predicts trade-offs between reproductive and survival traits such that different strategies or environmental constraints may yield comparable lifetime reproductive success among conspecifics. Food availability is one of the most important environmental factors shaping developmental processes. It notably affects key life-history components such as reproduction and survival prospect. We investigated whether food resource availability could also operate as an ultimate driver of life-history strategy variation between species...
June 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28648806/the-evolutionary-consequences-of-stepwise-infection-processes
#4
REVIEW
Matthew D Hall, Gilberto Bento, Dieter Ebert
Molecular and cellular studies reveal that the resistance of hosts to parasites and pathogens is a cascade-like process with multiple steps required to be passed for successful infection. By contrast, much of evolutionary reasoning is based on strongly simplified, one- or two-step infection processes with simple genetics or on resistance being a quantitative trait. Here we attempt a conceptual unification of these two perspectives with the aim of cross-fostering research and filling some of the gaps in our concepts of the ecology and evolution of disease...
June 22, 2017: Trends in Ecology & Evolution
https://www.readbyqxmd.com/read/28646625/fluctuating-effects-of-genetic-and-plastic-changes-in-body-mass-on-population-dynamics-in-a-large-herbivore
#5
Gabriel Pigeon, Thomas H G Ezard, Marco Festa-Bianchet, David W Coltman, Fanie Pelletier
Recent studies suggest that evolutionary changes can occur on a contemporary time scale. Hence, evolution can influence ecology and vice-versa. To understand the importance of eco-evolutionary dynamics in population dynamics, we must quantify the relative contribution of ecological and evolutionary changes to population growth and other ecological processes. To date, however, most eco-evolutionary dynamics studies have not partitioned the relative contribution of plastic and evolutionary changes in traits on population, community and ecosystem processes...
June 24, 2017: Ecology
https://www.readbyqxmd.com/read/28646115/genome-analysis-of-endomicrobium-proavitum-suggests-loss-and-gain-of-relevant-functions-during-the-evolution-of-intracellular-symbionts
#6
Hao Zheng, Carsten Dietrich, Andreas Brune
Bacterial endosymbionts of eukaryotes show progressive genome erosion, but detailed investigations of the evolutionary processes involved in the transition to an intracellular lifestyle are generally hampered by the lack of extant free-living lineages. Here, we characterize the genome of the recently isolated, free-living Endomicrobium proavitum, the second member of the Elusimicrobia phylum brought into pure culture, and compare it to the closely related "Candidatus Endomicrobium trichonymphae" strain Rs-D17, a previously described but uncultured endosymbiont of termite gut flagellates...
June 23, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28645261/genome-wide-analysis-of-udp-glycosyltransferase-super-family-in-brassica-rapa-and-brassica-oleracea-reveals-its-evolutionary-history-and-functional-characterization
#7
Jingyin Yu, Fan Hu, Komivi Dossa, Zhaokai Wang, Tao Ke
BACKGROUND: Glycosyltransferases comprise a highly divergent and polyphyletic multigene family that is involved in widespread modification of plant secondary metabolites in a process called glycosylation. According to conserved domains identified in their amino acid sequences, these glycosyltransferases can be classified into a single UDP-glycosyltransferase (UGT) 1 superfamily. RESULTS: We performed genome-wide comparative analysis of UGT genes to trace evolutionary history in algae, bryophytes, pteridophytes, and angiosperms; then, we further investigated the expansion mechanisms and function characterization of UGT gene families in Brassica rapa and Brassica oleracea...
June 23, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28645204/when-homoplasy-is-not-homoplasy-dissecting-trait-evolution-by-contrasting-composite-and-reductive-coding
#8
Alejandro Torres-Montúfar, Thomas Borsch, Helga Ochoterena
The conceptualization and coding of characters is a difficult issue in phylogenetic systematics, no matter which inference method is used when reconstructing phylogenetic trees or if the characters are just mapped onto a specific tree. Complex characters are groups of features that can be divided into simpler hierarchical characters (reductive coding), although the implied hierarchical relational information may change depending on the type of coding (composite vs reductive). Up to now, there is no common agreement to either code characters as complex or simple...
June 22, 2017: Systematic Biology
https://www.readbyqxmd.com/read/28645142/polyphyly-of-arundinoideae-poaceae-and-evolution-of-the-twisted-geniculate-lemma-awn
#9
J K Teisher, M R McKain, B A Schaal, E A Kellogg
Background and Aims: Subfamily Arundinoideae represents one of the last unsolved taxonomic mysteries in the grass family (Poaceae) due to the narrow and remote distributions of many of its 19 morphologically and ecologically heterogeneous genera. Resolving the phylogenetic relationships of these genera could have substantial implications for understanding character evolution in the grasses, for example the twisted geniculate awn - a hygroscopic awn that has been shown to be important in seed germination for some grass species...
June 21, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28644876/effects-of-ploidy-level-and-haplotype-on-variation-of-photosynthetic-traits-novel-evidence-from-two-fragaria-species
#10
Song Gao, Qiaodi Yan, Luxi Chen, Yaobin Song, Junmin Li, Chengxin Fu, Ming Dong
To reveal the effects of ploidy level and haplotype on photosynthetic traits, we chose 175 genotypes of wild strawberries belonging to two haplotypes at two types of ploidy levels (diploidy and tetraploidy) and measured photosynthetic traits. Our results revealed that ploidy significantly affected the characteristics of light-response curves, CO2-response curves, and leaf gas exchange parameters, except intercellular CO2 concentration (Ci). Tetraploid species had a lower light saturation point (LSP) and CO2 saturation point (CSP), higher light compensation point (LCP), dark respiration (Rd), and CO2 compensation point (CCP) than diploid species...
2017: PloS One
https://www.readbyqxmd.com/read/28644846/the-tree-balance-signature-of-mass-extinction-is-erased-by-continued-evolution-in-clades-of-constrained-size-with-trait-dependent-speciation
#11
Guan-Dong Yang, Paul-Michael Agapow, Gabriel Yedid
The kind and duration of phylogenetic topological "signatures" left in the wake of macroevolutionary events remain poorly understood. To this end, we examined a broad range of simulated phylogenies generated using trait-biased, heritable speciation probabilities and mass extinction that could be either random or selective on trait value, but also using background extinction and diversity-dependence to constrain clade sizes. In keeping with prior results, random mass extinction increased imbalance of clades that recovered to pre-extinction size, but was a relatively weak effect...
2017: PloS One
https://www.readbyqxmd.com/read/28643887/personality-dopamine-and-parkinson-s-disease-insights-from-subthalamic-stimulation
#12
Eugénie Lhommée, François Boyer, Maxime Wack, Pierre Pélissier, Hélène Klinger, Emmanuelle Schmitt, Amélie Bichon, Valérie Fraix, Stéphan Chabardès, Patrick Mertens, Anna Castrioto, Andrea Kistner, Emmanuel Broussolle, Stéphane Thobois, Paul Krack
BACKGROUND: Subthalamic stimulation improves the motor and neuropsychiatric symptoms of Parkinson's disease. However, the impact of this treatment on impulse control and personality is the subject of heavy debate. The objective of this study was to investigate personality changes after subthalamic stimulation. METHODS: Using Cloninger's biosocial model, we assessed personality in 73 Parkinson's disease patients before and 12 months after subthalamic stimulation accompanied by a drastic reduction in dopaminergic medication...
June 23, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28643786/a-unified-model-of-hymenopteran-preadaptations-that-trigger-the-evolutionary-transition-to-eusociality
#13
Andrés E Quiñones, Ido Pen
Explaining the origin of eusociality, with strict division of labour between workers and reproductives, remains one of evolutionary biology's greatest challenges. Specific combinations of genetic, behavioural and demographic traits in Hymenoptera are thought to explain their relatively high frequency of eusociality, but quantitative models integrating such preadaptations are lacking. Here we use mathematical models to show that the joint evolution of helping behaviour and maternal sex ratio adjustment can synergistically trigger both a behavioural change from solitary to eusocial breeding, and a demographic change from a life cycle with two reproductive broods to a life cycle in which an unmated cohort of female workers precedes a final generation of dispersing reproductives...
June 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28643626/what-defines-the-kingdom-fungi
#14
Thomas A Richards, Guy Leonard, Jeremy G Wideman
The application of environmental DNA techniques and increased genome sequencing of microbial diversity, combined with detailed study of cellular characters, has consistently led to the reexamination of our understanding of the tree of life. This has challenged many of the definitions of taxonomic groups, especially higher taxonomic ranks such as eukaryotic kingdoms. The Fungi is an example of a kingdom which, together with the features that define it and the taxa that are grouped within it, has been in a continual state of flux...
June 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28642778/characterization-of-salt-induced-epigenetic-segregation-by-genome-wide-loss-of-heterozygosity-and-its-association-with-salt-tolerance-in-rice-oryza-sativa-l
#15
Min Li, Wen-Sheng Wang, Yun-Long Pang, Jessica R Domingo, Jauhar Ali, Jian-Long Xu, Bin-Ying Fu, Elec B Venus, Zhi-Kang Li
In a breeding effort to develop salt tolerant (ST) rice varieties by designed QTL pyramiding, large numbers of progenies derived from four crosses between salt- or drought- tolerant BC2F5 IR64 introgression lines, were subjected to severe salt stress, resulting in 422 ST plants. The progeny testing of the selected F3 lines under more severe salt stress resulted in identification of 16 promising homozygous lines with high levels of ST. Genetic characterization of the 422 ST F3 progeny and 318 random F2 plants from the same four crosses using 105 segregating SSR markers lead to three interesting discoveries: (1) salt stress can induce genome-wide epigenetic segregation (ES) characterized by complete loss of heterozygosity (LOH) and nearly complete loss of an allele (LOA) in the F3 progenies of four rice populations in a single generation; (2) ∼25% of the stress-induced ES loci were transgenerational and inherited from their salt- and drought- selected parents; and (3) the salt-induced LOH and LOA loci (regions) appeared to contain genes/alleles associated with ST and/or drought tolerance...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28642499/comprehensive-analysis-and-reinterpretation-of-cenozoic-mesofossils-reveals-ancient-origin-of-the-snapping-claw-of-alpheid-shrimps
#16
Matúš Hyžný, Andreas Kroh, Alexander Ziegler, Arthur Anker, Martin Košťák, Ján Schlögl, Adam Culka, John W M Jagt, René H B Fraaije, Mathias Harzhauser, Barry W M van Bakel, Andrej Ruman
Alpheid snapping shrimps (Decapoda: Caridea: Alpheidae) constitute one of the model groups for inferences aimed at understanding the evolution of complex structural, behavioural, and ecological traits among benthic marine invertebrates. Despite being a super-diverse taxon with a broad geographical distribution, the alpheid fossil record is still poorly known. However, data presented herein show that the strongly calcified fingertips of alpheid snapping claws are not uncommon in the fossil record and should be considered a novel type of mesofossil...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28642015/convergent-and-unidirectional-evolution-of-extremely-long-aedeagi-in-the-largest-feather-mite-genus-proctophyllodes-acari-proctophyllodidae-evidence-from-comparative-molecular-and-morphological-phylogenetics
#17
Pavel B Klimov, Sergey V Mironov, Barry M OConnor
Proctophyllodid feather mites (400+ species) are permanent (full-time) symbionts commonly occurring on passerine birds. Phenotypic evolution of these mites appears to be greatly influenced by characters related to reproduction (>87.5% of a total of 32 taxonomically important discrete characters) and male genitalic characters (21.9%). Because sexual selection could the major evolutionary driver in this system, we test the theoretical expectation that genitalic or sexually dimorphic characters should evolve more rapidly and divergently then other characters...
June 19, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28640437/repeated-evolution-of-vertebrate-pollination-syndromes-in-a-recently-diverged-andean-plant-clade
#18
Laura P Lagomarsino, Elisabeth J Forrestel, Nathan Muchhala, Charles C Davis
While specialized interactions, including those involving plants and their pollinators, are often invoked to explain high species diversity, they are rarely explored at macroevolutionary scales. We investigate the dynamic evolution of hummingbird and bat pollination syndromes in the centropogonid clade (Lobelioideae: Campanulaceae), an Andean-centered group of ∼550 angiosperm species. We demonstrate that flowers hypothesized to be adapted to different pollinators based on flower color fall into distinct regions of morphospace, and this is validated by morphology of species with known pollinators...
June 22, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28640400/little-evidence-for-intralocus-sexual-conflict-over-the-optimal-intake-of-nutrients-for-lifespan-and-reproduction-in-the-black-field-cricket-teleogryllus-commodus
#19
James Rapkin, Ruth C Archer, Charles E Grant, Kim Jensen, Clarissa M House, Alastair J Wilson, John Hunt
There is often large divergence in the effects of key nutrients on lifespan and reproduction in the sexes, yet nutrient intake is regulated in the same way in males and females given dietary choice. This suggests that the sexes are constrained from feeding to their sex-specific nutritional optima for these traits. Here we examine the potential for intralocus sexual conflict (IASC) over optimal protein and carbohydrate intake for lifespan and reproduction to constrain the evolution of sex-specific nutrient regulation in the field cricket, Teleogryllus commodus...
June 22, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28640393/malagasy-cichlids-differentially-limit-impacts-of-body-shape-evolution-on-oral-jaw-functional-morphology
#20
Christopher M Martinez, John S Sparks
Patterns of trait covariation, like integration and modularity, are vital factors that influence the evolution of vertebrate body plans. In functional systems, decoupling of morphological modules buffers functional change in one trait by reducing correlated variation with another. However, for complex morphologies with many-to-one mapping of form to function (MTOM), resistance to functional change may also be achieved by constraining morphological variation within a functionally stable region of morphospace...
June 22, 2017: Evolution; International Journal of Organic Evolution
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