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https://www.readbyqxmd.com/read/28616179/prediction-of-harmful-variants-on-mitochondrial-genes-test-of-habitat-dependent-and-demographic-effects-in-a-euryhaline-fish
#1
Anti Vasemägi, Janne Sulku, Matthieu Bruneaux, Olaf Thalmann, Hannu Mäkinen, Mikhail Ozerov
Both effective population size and life history may influence the efficacy of purifying selection, but it remains unclear if the environment affects the accumulation of weakly deleterious nonsynonymous polymorphisms. We hypothesize that the reduced energetic cost of osmoregulation in brackish water habitat may cause relaxation of selective constraints at mitochondrial oxidative phosphorylation (OXPHOS) genes. To test this hypothesis, we analyzed 57 complete mitochondrial genomes of Pungitius pungitius collected from brackish and freshwater habitats...
June 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28601012/diclofenac-affects-kidney-histology-in-the-three-spined-stickleback-gasterosteus-aculeatus-at-low-%C3%AE-g-l-concentrations
#2
Johanna Näslund, Jerker Fick, Noomi Asker, Elisabet Ekman, D G Joakim Larsson, Leif Norrgren
Diclofenac, a commonly used non-steroidal anti-inflammatory drug, is considered for regulation under the European water framework directive. This is because effects on fish have bean reported at concentrations around those regularly found in treated sewage effluents (∼1μg/L). However, a recent publication reports no effects on fish at 320μg/L. In this study, three-spined sticklebacks (Gasterosteus aculeatus) were exposed to 0, 4.6, 22, 82 and 271μg/L diclofenac in flow-through systems for 28days using triplicate aquaria per concentration...
May 31, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28590028/phenotypic-plasticity-drives-a-depth-gradient-in-male-conspicuousness-in-threespine-stickleback-gasterosteus-aculeatus
#3
Chad D Brock, Molly E Cummings, Daniel I Bolnick
Signal evolution is thought to depend on both a signal's detectability or conspicuousness (signal design) as well as any extractable information it may convey to a potential receiver (signal content). While theoretical and empirical work in sexual selection has largely focused on signal content, there has been a steady accrual of evidence that signal design is also important for trait evolution. Despite this, relatively little attention has been paid to spatial variation in the conspicuousness of a given signal, especially over small spatial scales (relative to an organism's dispersal distance)...
June 7, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28588142/recent-evolution-of-extreme-cestode-growth-suppression-by-a-vertebrate-host
#4
Jesse N Weber, Natalie C Steinel, Kum Chuan Shim, Daniel I Bolnick
Parasites can be a major cause of natural selection on hosts, which consequently evolve a variety of strategies to avoid, eliminate, or tolerate infection. When ecologically similar host populations present disparate infection loads, this natural variation can reveal immunological strategies underlying adaptation to infection and population divergence. For instance, the tapeworm Schistocephalus solidus persistently infects 0-80% of threespine stickleback (Gasterosteus aculeatus) in lakes on Vancouver Island...
June 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28587593/low-genetic-and-phenotypic-divergence-in-a-contact-zone-between-freshwater-and-marine-sticklebacks-gene-flow-constrains-adaptation
#5
Susanne Holst Pedersen, Anne-Laure Ferchaud, Mia S Bertelsen, Dorte Bekkevold, Michael M Hansen
BACKGROUND: Distinct hybrid zones and phenotypic and genomic divergence is often observed between marine and freshwater threespine sticklebacks (Gasterosteus aculeatus). Nevertheless, cases also exist where marine-freshwater divergence is diffuse despite seemingly similar environmental settings. In order to assess what characterizes these highly different outcomes, we focused on the latter kind of system in the Odder River, Denmark. Here, a previous study based on RAD (Restriction site Associated DNA) sequencing found non-significant genome-wide differentiation between marine and freshwater sticklebacks...
June 6, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28576775/cold-fusion-massive-karyotype-evolution-in-the-antarctic-bullhead-notothen-notothenia-coriiceps
#6
Angel Amores, Catherine A Wilson, Corey A H Allard, H William Detrich, John H Postlethwait
Half of all vertebrate species share a series of chromosome fusions that preceded the teleost genome duplication, but we don't understand the causative evolutionary mechanisms. The "Robertsonian-translocation hypothesis" suggests a regular fusion of each ancestral acro- or telocentric chromosome to just one other by centromere fusions, thus halving the karyotype. An alternative "genome-stirring hypothesis" posits haphazard and repeated fusions, inversions, and reciprocal and non-reciprocal translocations. To study large-scale karyotype reduction, we investigated the decrease of chromosome numbers in Antarctic notothenioid fish...
June 2, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28571568/environmental-temperature-variation-influences-fitness-trade-offs-and-tolerance-in-a-fish-tapeworm-association
#7
Frederik Franke, Sophie A O Armitage, Megan A M Kutzer, Joachim Kurtz, Jörn P Scharsack
BACKGROUND: Increasing temperatures are predicted to strongly impact host-parasite interactions, but empirical tests are rare. Host species that are naturally exposed to a broad temperature spectrum offer the possibility to investigate the effects of elevated temperatures on hosts and parasites. Using three-spined sticklebacks, Gasterosteus aculeatus L., and tapeworms, Schistocephalus solidus (Müller, 1776), originating from a cold and a warm water site of a volcanic lake, we subjected sympatric and allopatric host-parasite combinations to cold and warm conditions in a fully crossed design...
June 2, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28570029/plasticity-contributes-to-a-fine-scale-depth-gradient-in-sticklebacks-visual-system
#8
Thor Veen, Chad Brock, Diana Rennison, Daniel Bolnick
The light environment influences an animal's ability to forage, evade predators, and find mates, and consequently is known to drive local adaptation of visual systems. However, the light environment may also vary over fine spatial scales at which genetic adaptation is difficult. For instance, in aquatic systems the available wavelengths of light change over a few meters depth. Do animals plastically adjust their visual system to such small-scale environmental light variation? Here, we show that in threespine stickleback (Gasterosteus aculeatus), opsin gene expression (an important determinant of colour vision) changes over a 2-meter vertical gradient in nest depth...
June 1, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28562593/frequency-dependence-limits-divergent-evolution-by-favouring-rare-immigrants-over-residents
#9
Daniel I Bolnick, William E Stutz
Two distinct forms of natural selection promote adaptive biological diversity. Divergent selection occurs when different environments favour different phenotypes, leading to increased differences between populations. Negative frequency-dependent selection occurs when rare variants within a population are favoured over common ones, increasing diversity within populations. These two diversifying forces promote genetic variation at different spatial scales, and may act in opposition, but their relative effects remain unclear because they are rarely measured concurrently...
June 8, 2017: Nature
https://www.readbyqxmd.com/read/28545861/characterization-of-autonomous-families-of-tc1-mariner-transposons-in-neoteleost-genomes
#10
Bo Gao, Wei Chen, Dan Shen, Saisai Wang, Cai Chen, Li Zhang, Wei Wang, Xiaoyan Wang, Chengyi Song
We report the comprehensive analysis of Tc1/mariner transposons in six species of neoteleost (cod, tetraodon, fugu, medaka, stickleback, and tilapia) for which draft sequences are available. In total, 33 Tc1/mariner families were identified in these neoteleost genomes, with 3-7 families in each species. Thirty of these are in full length and designed as autonomous families, and were classified into the DD34E (Tc1) and DD×D (pogo) groups. The DD34E (Tc1) group was further classified into five clusters (Passport-like, SB-like, Frog Prince-like, Minos-like, and Bari-like)...
May 22, 2017: Marine Genomics
https://www.readbyqxmd.com/read/28544317/fish-parasite-dinoflagellates-haidadinium-ichthyophilum-and-piscinoodinium-share-a-recent-common-ancestor
#11
Elisabeth Hehenberger, Erick R James, Javier Del Campo, John A Buckland-Nicks, Thomas E Reimchen, Patrick J Keeling
The dinoflagellate Haidadinium ichthyophilum Buckland-Nicks, Reimchen and Garbary 1997 is an ectoparasite of the spine-deficient, three-spine stickleback Gasterosteus aculeatus L. Reimchen 1984, a fish endemic to Rouge Lake, Haida Gwaii. Haidadinium ichthyophilum proved difficult to assign taxonomically, because its morphology and complex life cycle exhibited defining characteristics of both autotrophic and heterotrophic dinoflagellates, and was tentatively assigned to the Phytodiniales. Here, we characterized a 492bp-fragment of the small subunit ribosomal RNA (SSU rRNA) from preserved H...
May 25, 2017: Journal of Eukaryotic Microbiology
https://www.readbyqxmd.com/read/28534314/rapid-molecular-sexing-of-three-spined-sticklebacks-gasterosteus-aculeatus-l-based-on-large-y-chromosomal-insertions
#12
Theo C M Bakker, Thomas Giger, Joachim G Frommen, Carlo R Largiadèr
There is a need for rapid and reliable molecular sexing of three-spined sticklebacks, Gasterosteus aculeatus, the supermodel species for evolutionary biology. A DNA region at the 5' end of the sex-linked microsatellite Gac4202 was sequenced for the X chromosome of six females and the Y chromosome of five males from three populations. The Y chromosome contained two large insertions, which did not recombine with the phenotype of sex in a cross of 322 individuals. Genetic variation (SNPs and indels) within the insertions was smaller than on flanking DNA sequences...
May 22, 2017: Journal of Applied Genetics
https://www.readbyqxmd.com/read/28516498/non-parallel-divergence-across-freshwater-and-marine-three-spined-stickleback-gasterosteus-aculeatus-populations
#13
J M Pujolar, A L Ferchaud, D Bekkevold, M M Hansen
This work investigated whether multiple freshwater populations of three-spined stickleback Gasterosteus aculeatus in different freshwater catchments in the Jutland Peninsula, Denmark, derived from the same marine populations show repeated adaptive responses. A total of 327 G. aculeatus collected at 13 sampling locations were screened for genetic variation using a combination of 70 genes putatively under selection and 26 neutral genes along with a marker linked to the ectodysplasin gene (eda), which is strongly correlated with plate armour morphs in the species...
May 17, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28515873/brain-morphology-of-the-threespine-stickleback-gasterosteus-aculeatus-varies-inconsistently-with-respect-to-habitat-complexity-a-test-of-the-clever-foraging-hypothesis
#14
Newaz I Ahmed, Cole Thompson, Daniel I Bolnick, Yoel E Stuart
The Clever Foraging Hypothesis asserts that organisms living in a more spatially complex environment will have a greater neurological capacity for cognitive processes related to spatial memory, navigation, and foraging. Because the telencephalon is often associated with spatial memory and navigation tasks, this hypothesis predicts a positive association between telencephalon size and environmental complexity. The association between habitat complexity and brain size has been supported by comparative studies across multiple species but has not been widely studied at the within-species level...
May 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28480006/watershed-characteristics-shape-the-landscape-genetics-of-brook-stickleback-culaea-inconstans-in-shallow-prairie-lakes
#15
Cory S Kremer, Steven M Vamosi, Sean M Rogers
Investigating the consequences of landscape features on population genetic patterns is increasingly important to elucidate the ecological factors governing connectivity between populations and predicting the evolutionary consequences of landscapes. Small prairie lakes in Alberta, Canada, and the brook stickleback (Culaea inconstans) that inhabit them, provide a unique aquatic system whereby populations are highly isolated from one another. These heterogeneous and extreme environments are prone to winterkills, an event whereby most of the fish die and frequent bottlenecks occur...
May 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28437583/natural-selection-on-mhc-ii%C3%AE-in-parapatric-lake-and-stream-stickleback-balancing-divergent-both-or-neither
#16
William E Stutz, Daniel I Bolnick
Major histocompatibility (MHC) genes encode proteins that play a central role in vertebrates' adaptive immunity to parasites. MHC loci are among the most polymorphic in vertebrates' genomes, inspiring many studies to identify evolutionary processes driving MHC polymorphism within populations, and divergence between populations. Leading hypotheses include balancing selection favoring rare alleles within populations, and spatially divergent selection. These hypotheses do not always produce diagnosably distinct predictions, causing many studies of MHC to yield inconsistent or ambiguous results...
April 24, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28428852/stoichiometric-traits-of-stickleback-effects-of-genetic-background-rearing-environment-and-ontogeny
#17
Miguel Costa Leal, Rebecca J Best, Dan Durston, Rana W El-Sabaawi, Blake Matthews
Phenotypes can both evolve in response to, and affect, ecosystem change, but few examples of diverging ecosystem-effect traits have been investigated. Bony armor traits of fish are good candidates for this because they evolve rapidly in some freshwater fish populations, and bone is phosphorus rich and likely to affect nutrient recycling in aquatic ecosystems. Here, we explore how ontogeny, rearing environment, and bone allocation among body parts affect the stoichiometric phenotype (i.e., stoichiometric composition of bodies and excretion) of threespine stickleback...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28399148/convergent-evolution-of-sws2-opsin-facilitates-adaptive-radiation-of-threespine-stickleback-into-different-light-environments
#18
David A Marques, John S Taylor, Felicity C Jones, Federica Di Palma, David M Kingsley, Thomas E Reimchen
Repeated adaptation to a new environment often leads to convergent phenotypic changes whose underlying genetic mechanisms are rarely known. Here, we study adaptation of color vision in threespine stickleback during the repeated postglacial colonization of clearwater and blackwater lakes in the Haida Gwaii archipelago. We use whole genomes from 16 clearwater and 12 blackwater populations, and a selection experiment, in which stickleback were transplanted from a blackwater lake into an uninhabited clearwater pond and resampled after 19 y to test for selection on cone opsin genes...
April 2017: PLoS Biology
https://www.readbyqxmd.com/read/28393424/a-comparative-analysis-of-experimental-selection-on-the-stickleback-pelvis
#19
S E Miller, M Barrueto, D Schluter
Mechanisms of natural selection can be identified using experimental approaches. However, such experiments often yield nonsignificant effects and imprecise estimates of selection due to low power and small sample sizes. Combining results from multiple experimental studies might produce an aggregate estimate of selection that is more revealing than individual studies. For example, bony pelvic armour varies conspicuously among stickleback populations, and predation by vertebrate and insect predators has been hypothesized to be the main driver of this variation...
April 9, 2017: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/28391321/host-genotype-and-microbiota-contribute-asymmetrically-to-transcriptional-variation-in-the-threespine-stickleback-gut
#20
Clayton M Small, Kathryn Milligan-Myhre, Susan Bassham, Karen Guillemin, William A Cresko
Recent studies of interactions between hosts and their resident microbes have revealed important ecological and evolutionary consequences that emerge from these complex interspecies relationships, including diseases that occur when the interactions go awry. Given the preponderance of these interactions, we hypothesized that effects of the microbiota on gene expression in the developing gut-an important aspect of host biology-would be pervasive, and that these effects would be both comparable in magnitude to and contingent on effects of the host genetic background...
March 1, 2017: Genome Biology and Evolution
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