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Evolutionary dynamics

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https://www.readbyqxmd.com/read/28213971/mass-turnover-and-recovery-dynamics-of-a-diverse-australian-continental-radiation
#1
Ian G Brennan, Paul M Oliver
Trends in global and local climate history have been linked to observed macroevolutionary patterns across a variety of organisms. These climatic pressures may unilaterally or asymmetrically influence the evolutionary trajectory of clades. To test and compare signatures of changing global (Eocene-Oligocene boundary cooling) and continental (Miocene aridification) environments on a continental fauna, we investigated the macroevolutionary dynamics of one of Australia's most diverse endemic radiations, pygopodoid geckos...
February 18, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28211914/eco-evolutionary-feedbacks-can-rescue-cooperation-in-microbial-populations
#2
Clara Moreno-Fenoll, Matteo Cavaliere, Esteban Martínez-García, Juan F Poyatos
Bacterial populations whose growth depends on the cooperative production of public goods are usually threatened by the rise of cheaters that do not contribute but just consume the common resource. Minimizing cheater invasions appears then as a necessary mechanism to maintain these populations. However, that invasions result instead in the persistence of cooperation is a prospect that has yet remained largely unexplored. Here, we show that the demographic collapse induced by cheaters in the population can actually contribute to the rescue of cooperation, in a clear illustration of how ecology and evolution can influence each other...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211729/stochastic-dynamics-through-hierarchically-embedded-markov-chains
#3
Vítor V Vasconcelos, Fernando P Santos, Francisco C Santos, Jorge M Pacheco
Studying dynamical phenomena in finite populations often involves Markov processes of significant mathematical and/or computational complexity, which rapidly becomes prohibitive with increasing population size or an increasing number of individual configuration states. Here, we develop a framework that allows us to define a hierarchy of approximations to the stationary distribution of general systems that can be described as discrete Markov processes with time invariant transition probabilities and (possibly) a large number of states...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28211483/colonisation-in-social-species-the-importance-of-breeding-experience-for-dispersal-in-overcoming-information-barriers
#4
A Payo-Payo, M Genovart, A Sanz-Aguilar, J L Greño, M García-Tarrasón, A Bertolero, J Piccardo, D Oro
Studying colonisation is crucial to understand metapopulations, evolutionary ecology and species resilience to global change. Unfortunately, few empirical data are available because field monitoring that includes empty patches at large spatiotemporal scales is required. We examine the colonisation dynamics of a long-lived seabird over 34 years in the western Mediterranean by comparing population and individual data from both source colony and the newly-formed colonies. Since social information is not available, we hypothesize that colonisation should follow particular dispersal dynamics and personal information must be crucial in decision making...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211463/ecological-and-genetic-basis-of-metapopulation-persistence-of-the-glanville-fritillary-butterfly-in-fragmented-landscapes
#5
Ilkka Hanski, Torsti Schulz, Swee Chong Wong, Virpi Ahola, Annukka Ruokolainen, Sami P Ojanen
Ecologists are challenged to construct models of the biological consequences of habitat loss and fragmentation. Here, we use a metapopulation model to predict the distribution of the Glanville fritillary butterfly during 22 years across a large heterogeneous landscape with 4,415 small dry meadows. The majority (74%) of the 125 networks into which the meadows were clustered are below the extinction threshold for long-term persistence. Among the 33 networks above the threshold, spatial configuration and habitat quality rather than the pooled habitat area predict metapopulation size and persistence, but additionally allelic variation in a SNP in the gene Phosphoglucose isomerase (Pgi) explains 30% of variation in metapopulation size...
February 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28211052/life-history-strategy-determines-constraints-on-immune-function
#6
Benjamin J Parker, Seth M Barribeau, Alice M Laughton, Lynn H Griffin, Nicole M Gerardo
1)Determining the factors governing investment in immunity is critical for understanding host-pathogen ecological and evolutionary dynamics. Studies often consider disease resistance in the context of life-history theory, with the expectation that investment in immunity will be optimized in anticipation of disease risk. Immunity, however, is constrained by context-dependent fitness costs. How the costs of immunity vary across life-history strategies has yet to be considered. 2)Pea aphids are typically unwinged but produce winged offspring in response to high population densities and deteriorating conditions...
February 17, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28209121/evolution-of-toll-like-receptors-in-the-context-of-terrestrial-ungulates-and-cetaceans-diversification
#7
Edson Ishengoma, Morris Agaba
BACKGROUND: Toll-like receptors (TLRs) are the frontline actors in the innate immune response to various pathogens and are expected to be targets of natural selection in species adapted to habitats with contrasting pathogen burdens. The recent publication of genome sequences of giraffe and okapi together afforded the opportunity to examine the evolution of selected TLRs in broad range of terrestrial ungulates and cetaceans during their complex habitat diversification. Through direct sequence comparisons and standard evolutionary approaches, the extent of nucleotide and protein sequence diversity in seven Toll-like receptors (TLR2, TLR3, TLR4, TLR5, TLR7, TLR9 and TLR10) between giraffe and closely related species was determined...
February 16, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28207956/application-of-network-methods-for-understanding-evolutionary-dynamics-in-discrete-habitats
#8
Gili Greenbaum, Nina H Fefferman
In populations occupying discrete habitat patches, gene flow between habitat patches may form an intricate population structure. In such structures, the evolutionary dynamics resulting from interaction of gene flow patterns with other evolutionary forces may be exceedingly complex. Several models describing gene flow between discrete habitat patches have been presented in the population genetics literature; however, these models have usually addressed relatively simple settings of habitable patches, and have stopped short of providing general methodologies for addressing non-trivial gene flow patterns...
February 16, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28206693/plasmid-and-clonal-interference-during-post-horizontal-gene-transfer-evolution
#9
S Bedhomme, D Perez Pantoja, I G Bravo
Plasmids are nucleic acid molecules that can drive their own replication in a living cell. They can be transmitted horizontally and can thrive in the host cell to high copy numbers. Plasmid replication and gene expression consume cellular resources and cells carrying plasmids incur fitness costs. But many plasmids carry genes that can be beneficial under certain conditions, allowing the cell to endure in the presence of antibiotics, toxins, competitors or parasites. Horizontal transfer of plasmid-encoded genes can thus instantaneously confer differential adaptation to local or transient selection conditions...
February 16, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28205508/global-dynamics-of-non-equilibrium-gliding-in-animals
#10
Isaac Yeaton, Jake Socha, Shane Ross
Gliding flight - moving horizontally downward through the air without power - has evolved in a broad diversity of taxa and serves numerous ecologically relevant functions such as predator escape, expanding foraging locations, and finding mates, and has been suggested as an evolutionary pathway to powered flight. Historically, gliding has been conceptualized using the idealized conditions of equilibrium, in which the net aerodynamic force on the glider balances its weight. While this assumption is appealing for its simplicity, recent studies of glide trajectories have shown that equilibrium gliding is not the norm for most species...
February 16, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28204813/homeostasis-and-the-concept-of-interstitial-fluids-hierarchy-relevance-of-cerebrospinal-fluid-sodium-concentrations-and-brain-temperature-control%C3%A2-review
#11
Luigi F Agnati, Manuela Marcoli, Giuseppina Leo, Guido Maura, Diego Guidolin
In this review, the aspects and further developments of the concept of homeostasis are discussed also in the perspective of their possible impact in the clinical practice, particularly as far as psychic homeostasis is concerned. A brief historical survey and comments on the concept of homeostasis and allostasis are presented to introduce our proposal that is based on the classical assumption of the interstitial fluid (ISF) as the internal medium for multicellular organisms. However, the new concept of a hierarchic role of ISF of the various organs is introduced...
February 3, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28202809/mammal-body-size-evolution-in-north-america-and-europe-over-20-myr-similar-trends-generated-by-different-processes
#12
Shan Huang, Jussi T Eronen, Christine M Janis, Juha J Saarinen, Daniele Silvestro, Susanne A Fritz
Because body size interacts with many fundamental biological properties of a species, body size evolution can be an essential component of the generation and maintenance of biodiversity. Here we investigate how body size evolution can be linked to the clade-specific diversification dynamics in different geographical regions. We analyse an extensive body size dataset of Neogene large herbivores (covering approx. 50% of the 970 species in the orders Artiodactyla and Perissodactyla) in Europe and North America in a Bayesian framework...
February 22, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28202034/transcriptomic-signatures-shaped-by-cell-proportions-shed-light-on-comparative-developmental-biology
#13
Sophie Pantalacci, Laurent Guéguen, Coraline Petit, Anne Lambert, Renata Peterkovà, Marie Sémon
BACKGROUND: Comparative transcriptomics can answer many questions in developmental and evolutionary developmental biology. Most transcriptomic studies start by showing global patterns of variation in transcriptomes that differ between species or organs through developmental time. However, little is known about the kinds of expression differences that shape these patterns. RESULTS: We compared transcriptomes during the development of two morphologically distinct serial organs, the upper and lower first molars of the mouse...
February 15, 2017: Genome Biology
https://www.readbyqxmd.com/read/28199442/phylogeographic-history-of-south-american-populations-of-the-silky-anteater-cyclopes-didactylus-pilosa-cyclopedidae
#14
Raphael Teodoro Franciscani Coimbra, Flávia Regina Miranda, Camila Clozato Lara, Marco Antônio Alves Schetino, Fabrício Rodrigues Dos Santos
Cyclopes didactylus, commonly called silky anteater, is the smallest and least studied of the anteaters. It is an arboreal species occurring in rainforests, ranging from southern Mexico to Central and South America, with an apparently disjoint distribution between Amazon and Atlantic rainforests in Brazil. Although seven subspecies are recognized, little is known about its geographical variation. Thus, to evaluate the population dynamics and evolutionary history of the South American silky anteater, we analyzed 1542 bp sequences of the mitochondrial control region (CR), COI and Cyt-b genes of 32 individuals...
February 13, 2017: Genetics and Molecular Biology
https://www.readbyqxmd.com/read/28199335/ecological-networks-to-unravel-the-routes-to-horizontal-transposon-transfers
#15
Samuel Venner, Vincent Miele, Christophe Terzian, Christian Biémont, Vincent Daubin, Cédric Feschotte, Dominique Pontier
Transposable elements (TEs) represent the single largest component of numerous eukaryotic genomes, and their activity and dispersal constitute an important force fostering evolutionary innovation. The horizontal transfer of TEs (HTT) between eukaryotic species is a common and widespread phenomenon that has had a profound impact on TE dynamics and, consequently, on the evolutionary trajectory of many species' lineages. However, the mechanisms promoting HTT remain largely unknown. In this article, we argue that network theory combined with functional ecology provides a robust conceptual framework and tools to delineate how complex interactions between diverse organisms may act in synergy to promote HTTs...
February 2017: PLoS Biology
https://www.readbyqxmd.com/read/28198700/towards-a-mechanistic-foundation-of-evolutionary-theory
#16
Michael Doebeli, Yaroslav Ispolatov, Burt Simon
Most evolutionary thinking is based on the notion of fitness and related ideas such as fitness landscapes and evolutionary optima. Nevertheless, it is often unclear what fitness actually is, and its meaning often depends on the context. Here we argue that fitness should not be a basal ingredient in verbal or mathematical descriptions of evolution. Instead, we propose that evolutionary birth-death processes, in which individuals give birth and die at ever-changing rates, should be the basis of evolutionary theory, because such processes capture the fundamental events that generate evolutionary dynamics...
February 15, 2017: ELife
https://www.readbyqxmd.com/read/28197858/mapping-biological-transmission-an-empirical-dynamical-and-evolutionary-approach
#17
Francesca Merlin, Livio Riboli-Sasco
The current debate over extending inheritance and its evolutionary impact has focused on adding new categories of non-genetic factors to the classical transmission of DNA, and on trying to redefine inheritance. Transmitted factors have been mainly characterized by their directions of transmission (vertical, horizontal, or both) and the way they store variations. In this paper, we leave aside the issue of defining inheritance. We rather try to build an evolutionary conceptual framework that allows for tracing most, if not all forms of transmission and makes sense of their different tempos and modes...
February 14, 2017: Acta Biotheoretica
https://www.readbyqxmd.com/read/28193825/correction-to-adaptation-to-fragmentation-evolutionary-dynamics-driven-by-human-influences
#18
Pierre-Olivier Cheptou, Anna L Hargreaves, Dries Bonte, Hans Jacquemyn
No abstract text is available yet for this article.
April 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28193824/correction-to-eco-evolutionary-dynamics-in-urbanized-landscapes-evolution-species-sorting-and-the-change-in-zooplankton-body-size-along-urbanization-gradients
#19
Kristien I Brans, Lynn Govaert, Jessie M T Engelen, Andros T Gianuca, Caroline Souffreau, Luc De Meester
No abstract text is available yet for this article.
April 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28193656/within-host-selection-of-drug-resistance-in-a-mouse-model-reveals-dose-dependent-selection-of-atovaquone-resistance-mutations
#20
Suci Nuralitha, Lydia S Murdiyarso, Josephine E Siregar, Din Syafruddin, Jessica Roelands, Jan Verhoef, Andy I M Hoepelman, Sangkot Marzuki
The evolutionary selection of malaria parasites within individual host plays a critical role in the emergence of drug resistance. We have compared the selection of atovaquone resistance mutant in mouse models reflecting two different causes of failure in malaria treatment, inadequate sub-therapeutic dose and incomplete therapeutic dose.The two models are based on cycles of insufficient treatment of P. berghei-infected mice: repeated inadequate treatment associated with sub-therapeutic dose (0.1 mg Kg(-1) BW; RIaT) and repeated incomplete treatment with therapeutic dose (14...
February 13, 2017: Antimicrobial Agents and Chemotherapy
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