10,057 results match your criteria stickleback


Evolution after whole genome duplication: teleost microRNAs.

Mol Biol Evol 2021 Apr 19. Epub 2021 Apr 19.

Institute of Neuroscience, University of Oregon, Eugene OR 97403, USA.

microRNAs (miRNAs) are important gene expression regulators implicated in many biological processes, but we lack a global understanding of how miRNA genes evolve and contribute to developmental canalization and phenotypic diversification. Whole genome duplication events likely provide a substrate for species divergence and phenotypic change by increasing gene numbers and relaxing evolutionary pressures. To understand the consequences of genome duplication on miRNA evolution, we studied miRNA genes following the Teleost Genome Duplication (TGD). Read More

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Simulating the thermal impact of substrate temperature on ecological restoration in shallow urban rivers.

J Environ Manage 2021 Apr 12;289:112560. Epub 2021 Apr 12.

Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO, 80401, USA.

Managing river temperature in highly urbanized stream systems is critical for maintaining aquatic ecosystems and associated beneficial uses. In this work, we updated and utilized a mechanistic river temperature model, i-Tree Cool River, to evaluate the cooling impacts of two ecological restoration scenarios: (1) an alternative streambed material limecrete and (2) shading effects of tree planting in riparian areas. The i-Tree Cool River model was modified to account for diurnal fluctuations of streambed temperature, which is relevant in shallow urban streams where lack of natural shading combined with low heat capacity of the water column can make diurnal fluctuations relatively extreme. Read More

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"Micropersonality" traits and their implications for behavioral and movement ecology research.

Ecol Evol 2021 Apr 22;11(7):3264-3273. Epub 2021 Feb 22.

Department of Biosciences College of Science Swansea University Swansea UK.

Many animal personality traits have implicit movement-based definitions and can directly or indirectly influence ecological and evolutionary processes. It has therefore been proposed that animal movement studies could benefit from acknowledging and studying consistent interindividual differences (personality), and, conversely, animal personality studies could adopt a more quantitative representation of movement patterns.Using high-resolution tracking data of three-spined stickleback fish () we examined the repeatability of four movement parameters commonly used in the analysis of discrete time series movement data (time stationary, step length, turning angle, burst frequency) and four behavioral parameters commonly used in animal personality studies (distance travelled, space use, time in free water, and time near objects). Read More

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Adaptive Divergence under Gene Flow along an Environmental Gradient in Two Coexisting Stickleback Species.

Genes (Basel) 2021 Mar 18;12(3). Epub 2021 Mar 18.

Faculty of Biosciences and Aquaculture, Nord University, N-8049 Bodø, Norway.

There is a general and solid theoretical framework to explain how the interplay between natural selection and gene flow affects local adaptation. Yet, to what extent coexisting closely related species evolve collectively or show distinctive evolutionary responses remains a fundamental question. To address this, we studied the population genetic structure and morphological differentiation of sympatric three-spined and nine-spined stickleback. Read More

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Mitochondrial volume density and evidence for its role in adaptive divergence in response to thermal tolerance in threespine stickleback.

J Comp Physiol B 2021 Mar 31. Epub 2021 Mar 31.

Department of Biological Sciences, University of Calgary, Calgary, AB, Canada.

Phenotypic plasticity is predicted to permit persistence in new environments, and may subsequently evolve to enhance fitness. Colonizing environments with lower winter temperatures can lead to the evolution of lower critical thermal minima; the corresponding physiological traits associated with temperature tolerance are predicted to involve mitochondrial function. Threespine stickleback (Gasterosteus aculeatus) have colonized freshwater lakes along the Pacific Northwest. Read More

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Acclimation effect on fish behavioural characteristics: determination of appropriate acclimation period for different species.

J Fish Biol 2021 Mar 30. Epub 2021 Mar 30.

Life Sciences Center, Vilnius University, Vilnius, Lithuania.

In the present study, we investigated the effect of acclimation duration (up to 4 h) on behavioural characteristics of taxonomically and functionally different fish species, i.e., the migratory rheophilic salmonids rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar), and the non-migratory eurytopic European perch (Perca fluviatilis) and three-spined stickleback (Gasterosteus aculeatus). Read More

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Distinct tooth regeneration systems deploy a conserved battery of genes.

Evodevo 2021 Mar 25;12(1). Epub 2021 Mar 25.

Department of Molecular & Cell Biology, University of California, Berkeley, USA.

Background: Vertebrate teeth exhibit a wide range of regenerative systems. Many species, including most mammals, reptiles, and amphibians, form replacement teeth at a histologically distinct location called the successional dental lamina, while other species do not employ such a system. Notably, a 'lamina-less' tooth replacement condition is found in a paraphyletic array of ray-finned fishes, such as stickleback, trout, cod, medaka, and bichir. Read More

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Multiple paths to the same destination: influence of gene flow on convergent evolution.

Mol Ecol 2021 Mar 24. Epub 2021 Mar 24.

Ecological Genetics Laboratory, National Institute of Genetics, Mishima, Shizuoka, Japan.

Elucidation of the genetic mechanisms of convergent evolution, i.e., the evolution of similar or same phenotypes in phylogenetically independent lineages, helps predict how populations will respond to the same selective pressures. Read More

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On the availability of the name Poecilia kempkesi Poeser 2013 (Cyprinodontiformes: Poeciliidae).

Zootaxa 2021 Feb 12;4927(2):zootaxa.4927.2.10. Epub 2021 Feb 12.

South African Institute for Aquatic Biodiversity, Private Bag 1015, Grahamstown, Eastern Cape, South Africa 6140..

The poeciliid species, Poecilia kempkesi Poeser, 2013, was the fourth species of the subgenus Acanthophacelus Eigenmann, 1907 to be described, based on individuals from a single urban anthropized locality close to Paramaribo, Suriname (Poeser, 2013). The description itself lacked any section clearly distinguishing the new species from the remaining species of Poecilia Bloch Schneider 1801, and in particular from the species of the subgenus Acanthophacelus, type species Poecilia reticulata Peters, 1859. According to Article 13 of the International Code of Zoological Nomenclature (ICZN, 1999) the criteria of availability for a species-group name are:. Read More

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February 2021

Nothobranchius elucens, a new species of seasonal killifish from the upper Nile drainage in Uganda (Cyprinodontiformes: Nothobranchiidae).

Authors:
Béla Nagy

Zootaxa 2021 Jan 20;4915(1):zootaxa.4915.1.10. Epub 2021 Jan 20.

30, Rue du Mont Ussy, 77300 Fontainebleau, France..

Nothobranchius elucens, new species, from a seasonal habitat in the Aringa system of the Achwa River in the upper Nile drainage in northern Uganda, is described. It belongs to the N. rubroreticulatus species group, whose members are characterised by male coloration of anal and caudal fins with slender light blue subdistal band and slender dark distal band. Read More

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January 2021

Developmental and Histopathological Changes in the Gonads of Female Japanese Medaka Following Exposure to Water from the Yellow River, China.

Bull Environ Contam Toxicol 2021 May 22;106(5):765-772. Epub 2021 Mar 22.

School of Medicine, Henan Polytechnic University, Jiaozuo, 454000, People's Republic of China.

Gonad development and histopathological changes typically associated with endocrine disruption were evaluated in female Japanese medaka (Oryzias latipes) exposed to river water from four representative cross-sections in the Yellow River (YR), China. Fish were held in the river water treatments from fertilization. Advanced ovarian development was observed in fish exposed to river water from Qinhe cross-section at 20 days post-hatch (dph) and in fish exposed to river water from all four cross-sections at 60 dph. Read More

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Using seasonal genomic changes to understand historical adaptation to new environments: Parallel selection on stickleback in highly-variable estuaries.

Mol Ecol 2021 Mar 13. Epub 2021 Mar 13.

Department of Biology, Redpath Museum, McGill University, Montreal, QC, Canada.

Parallel evolution is considered strong evidence for natural selection. However, few studies have investigated the process of parallel selection as it plays out in real time. The common approach is to study historical signatures of selection in populations already well adapted to different environments. Read More

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Ancient and modern stickleback genomes reveal the demographic constraints on adaptation.

Curr Biol 2021 Mar 4. Epub 2021 Mar 4.

Department of Natural History, Norwegian University of Science and Technology (NTNU), University Museum, 7491 Trondheim, Norway; Molecular Ecology and Fisheries Genetics Laboratory, School of Biological Sciences, Bangor University, Bangor, UK. Electronic address:

Adaptation is typically studied by comparing modern populations with contrasting environments. Individuals persisting in the ancestral habitat are typically used to represent the ancestral founding population; however, it has been questioned whether these individuals are good proxies for the actual ancestors. To address this, we applied a paleogenomics approach to directly access the ancestral genepool: partially sequencing the genomes of two 11- to 13,000-year-old stickleback recovered from the transitionary layer between marine and freshwater sediments of two Norwegian isolation lakes and comparing them with 30 modern stickleback genomes from the same lakes and adjacent marine fjord, in addition to a global dataset of 20 genomes. Read More

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Heritability of DNA methylation in threespine stickleback (Gasterosteus aculeatus).

Genetics 2021 Mar;217(1):1-15

Redpath Museum and Department of Biology, McGill University, Montreal, QC H3A 0C4, Canada.

Epigenetic mechanisms underlying phenotypic change are hypothesized to contribute to population persistence and adaptation in the face of environmental change. To date, few studies have explored the heritability of intergenerationally stable methylation levels in natural populations, and little is known about the relative contribution of cis- and trans-regulatory changes to methylation variation. Here, we explore the heritability of DNA methylation, and conduct methylation quantitative trait loci (meQTLs) analysis to investigate the genetic architecture underlying methylation variation between marine and freshwater ecotypes of threespine stickleback (Gasterosteus aculeatus). Read More

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mRNA Extraction from Gill Tissue for RNA-sequencing.

Bio Protoc 2020 Mar 5;10(5):e3539. Epub 2020 Mar 5.

Friedrich Miescher Laboratory of the Max Planck Society, Tuebingen, Germany.

Adaptation is thought to proceed in part through spatial and temporal changes in gene expression. Fish species such as the threespine stickleback are powerful vertebrate models to study the genetic architecture of adaptive changes in gene expression since divergent adaptation to different environments is common, they are abundant and easy to study in the wild and lab, and have well-established genetic and genomic resources. Fish gills, due to their respiratory and osmoregulatory roles, show many physiological adaptations to local water chemistry, including differences in gene expression. Read More

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Genome editing reveals fitness effects of a gene for sexual dichromatism in Sulawesian fishes.

Nat Commun 2021 03 1;12(1):1350. Epub 2021 Mar 1.

Ecological Genetics Laboratory, Department of Genomics and Evolutionary Biology, National Institute of Genetics, Mishima, Shizuoka, Japan.

Sexual selection drives rapid phenotypic diversification of mating traits. However, we know little about the causative genes underlying divergence in sexually selected traits. Here, we investigate the genetic basis of male mating trait diversification in the medaka fishes (genus Oryzias) from Sulawesi, Indonesia. Read More

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Sharply Angled Lateral Curvature Modification in Anal Fin of a Viviparous Fish, (Cyprinodontiformes: Goodeidae).

Zoolog Sci 2021 Feb;38(1):67-71

Department of Animal Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furocho, Chikusa-ku, Nagoya 464-8601, Japan.

Almost all viviparous species possess male external genitalia; for example, the mammalian penis is an intromittent organ. Some live-bearing bony fish use their anal fins to assist in mating and internal fertilization. We previously reported a male-specific asymmetric curvature at the posterior end of the anal fin in , a viviparous fish of the family Goodeidae. Read More

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February 2021

Variation in Mating Behaviors Between a Tropical and a Temperate Species of Medaka Fishes.

Zoolog Sci 2021 Feb;38(1):45-50

Tropical Biosphere Research Center, University of the Ryukyus, Okinawa 903-0213, Japan,

In medaka fishes, the family Adrianichthyidae, tropical species are known to be sexually more dimorphic than temperate species. If this reflects that tropical species are exposed to stronger sexual-selection pressures than temperate species, mating behaviors may also differ between tropical and temperate species. Our mating experiments revealed that males of , a tropical species of the family, perform "chasing" another male more frequently than males of , a temperate congener, and that male-male "combats" of tended to be followed by chasing compared with combats of males, indicating that males are more aggressive in male-male interactions than males. Read More

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February 2021

Effect of Environmental Contaminants on Antioxidant Defense System in Fringe-Lip Mullet (Crenimugil crenilabis) from Suez Canal, Egypt.

Bull Environ Contam Toxicol 2021 May 24;106(5):779-785. Epub 2021 Feb 24.

Department of Biology, College of Science, Majmaah University, Majmaah, 11952, Saudi Arabia.

Fish are widely used as model organisms for the assessment of the quality of aquatic environment and can therefore serve as bio-indicators of environmental contamination. The current research investigates the eco-physiological damage to fishes in Suez Canal for enhancing the biomonitoring of this area through the biochemical investigation, were estimated in the gills, kidney and liver of Mullet, (Crenimugil crenilabis) from Suez Canal, Egypt. This area gets a lot of wastes discharged from several industries, and it is considered as the main routes of many tankers. Read More

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Courtship behavior, nesting microhabitat, and assortative mating in sympatric stickleback species pairs.

Ecol Evol 2021 Feb 29;11(4):1741-1755. Epub 2021 Jan 29.

School of Life Sciences University of Nottingham Nottingham UK.

The maintenance of reproductive isolation in the face of gene flow is a particularly contentious topic, but differences in reproductive behavior may provide the key to explaining this phenomenon. However, we do not yet fully understand how behavior contributes to maintaining species boundaries. How important are behavioral differences during reproduction? To what extent does assortative mating maintain reproductive isolation in recently diverged populations and how important are "magic traits"? Assortative mating can arise as a by-product of accumulated differences between divergent populations as well as an adaptive response to contact between those populations, but this is often overlooked. Read More

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February 2021

Natural daily patterns in fish behaviour may confound results of ecotoxicological testing.

Environ Pollut 2021 May 13;276:116738. Epub 2021 Feb 13.

Animal Ecology, Global Change and Sustainable Development, KU Leuven, Leuven, Belgium; Centre for Environmental Management, University of the Free State, Bloemfontein, South Africa. Electronic address:

Low doses of neuroactive chemicals end up in the environment and disrupt behaviour of non-target organisms. Although a whole range of studies have documented pollutant-induced changes in behaviour, natural daily variability in behaviour is rarely taken into account. This is surprising because biological rhythms may affect the outcome of experiments, are adaptive and are expected to be sensitive to neurochemical exposure. Read More

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Migration histories and perfluoroalkyl acid (PFAA) loads in an estuarine fish: A novel union of analyses to understand variation in contaminant concentrations.

Environ Pollut 2021 May 7;276:116686. Epub 2021 Feb 7.

The University of Queensland, Queensland Alliance for Environmental Health Sciences, 20 Cornwall Street, Woolloongabba, Queensland, 4102, Australia.

Previous studies have shown that accumulation of perfluoroalkyl acids (PFAAs) in the tissues of aquatic species is highly variable. Movement and migration patterns in these species represent an important consideration when evaluating contaminant accumulation in exposed biota, and may have a large influence on the risk profiles for migratory seafood species. In this study, relationships between PFAA concentrations in muscle and liver tissue, and recent fish migration history (inferred from metals profiles in fish otoliths, otherwise known as otolith chemistry) were evaluated in Sea Mullet (Mugil cephalus). Read More

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Observation of Medaka Larval Gonads by Immunohistochemistry and Confocal Laser Microscopy.

Methods Mol Biol 2021 ;2218:209-218

Division of Biological Sciences, Graduate School of Science, Nagoya University, Nagoya, Japan.

The combination of immunohistochemistry and confocal laser microscopy enables the observation of cellular structures and protein localization within cells using whole-mount tissues. However, such high-resolution imaging requires several steps, such as proper dissection before fixation and antibody staining, and the appropriate positioning of tissues on a glass slide for observation. Here, we describe the method developed by our laboratory for the immunohistochemistry of medaka embryonic and larval gonads, focusing on the dissection and mounting of tissues for confocal laser microscopy. Read More

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Genomic evidence supports the introgression between two sympatric stickleback species inhabiting the White Sea basin.

Heliyon 2021 Feb 8;7(2):e06160. Epub 2021 Feb 8.

National Research Center "Kurchatov Institute", 123182 Moscow, Russia.

Interspecies hybridization is driven by a complex interplay of factors where introgression plays an important role. In the present study, the transfer of genetic material, between two quite distant fish species from different genera, through spontaneous hybridization was documented with dedicated molecular and bioinformatics tools. We investigate the genomic landscape of putative stickleback-relative introgression by carefully analyzing the tractable transposable elements (TE) on the admixed genome of some individuals of two sympatric stickleback species inhabiting northwestern Russia, namely the three-spined () and the nine-spined () sticklebacks. Read More

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February 2021

Improved contiguity of the threespine stickleback genome using long-read sequencing.

G3 (Bethesda) 2021 Feb;11(2)

Department of Genetics, University of Georgia, Athens, GA 30602, USA.

While the cost and time for assembling a genome has drastically decreased, it still remains a challenge to assemble a highly contiguous genome. These challenges are rapidly being overcome by the integration of long-read sequencing technologies. Here, we use long-read sequencing to improve the contiguity of the threespine stickleback fish (Gasterosteus aculeatus) genome, a prominent genetic model species. Read More

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February 2021

Genome sequences reveal global dispersal routes and suggest convergent genetic adaptations in seahorse evolution.

Nat Commun 2021 02 17;12(1):1094. Epub 2021 Feb 17.

CAS Key Laboratory of Tropical Marine Bio-Resources and Ecology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, China.

Seahorses have a circum-global distribution in tropical to temperate coastal waters. Yet, seahorses show many adaptations for a sedentary, cryptic lifestyle: they require specific habitats, such as seagrass, kelp or coral reefs, lack pelvic and caudal fins, and give birth to directly developed offspring without pronounced pelagic larval stage, rendering long-range dispersal by conventional means inefficient. Here we investigate seahorses' worldwide dispersal and biogeographic patterns based on a de novo genome assembly of Hippocampus erectus as well as 358 re-sequenced genomes from 21 species. Read More

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February 2021

Nest-site selection in a fish species with paternal care.

Hydrobiologia 2021 4;848(3):641-650. Epub 2020 Dec 4.

Abteilung Verhaltensökologie, Zoologisches Institut, University of Bern, Wohlenstrasse 50a, 3032 Hinterkappelen, Switzerland.

Fish that perform paternal care may increase their fitness by choosing nest sites that enhance survival and development of embryos. We studied nest-site choice with respect to dissolved oxygen concentration and water temperature in males of the three-spined stickleback (), a small fish species with exclusive male parental care that usually breeds in the littoral zone of freshwaters of the Northern hemisphere. Fathers oxygenate the embryos by fanning movements of their pectoral fins. Read More

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December 2020

What evolutionary processes maintain MHC IIꞵ diversity within and among populations of stickleback?

Mol Ecol 2021 04 25;30(7):1659-1671. Epub 2021 Feb 25.

Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, USA.

Major Histocompatibility Complex (MHC) genes code for proteins that recognize foreign protein antigens to initiate T-cell-mediated adaptive immune responses. They are often the most polymorphic genes in vertebrate genomes. How evolution maintains this diversity remains of debate. Read More

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Sublethal toxicity of PbI in perovskite solar cells to fish embryos (Danio rerio and Oryzias latipes): Deformity and growth inhibition.

Sci Total Environ 2021 Jun 3;771:145388. Epub 2021 Feb 3.

Department of Environmental Health Science, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea. Electronic address:

Pb-based perovskite in solar cells is a source of PbI. The objective of this study was to characterize the embryonic toxicity of PbI, a potentially leachable chemical and hazardous material, for two fish species (zebrafish and Japanese medaka). A series of measurements were performed to assess mortality, abnormalities (deformities and other pathological changes), hatchability, and growth inhibition. Read More

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Uptake and depuration kinetics of microplastics with different polymer types and particle sizes in Japanese medaka (Oryzias latipes).

Ecotoxicol Environ Saf 2021 Apr 1;212:112007. Epub 2021 Feb 1.

Laboratory of Marine Environmental Science, Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, Fukuoka 819-0395, Japan; Institute of Nature and Environmental Technology, Kanazawa University, Kanazawa 920-1192, Japan. Electronic address:

Microplastic (MP) pollution and the related impacts on aquatic species have drawn worldwide attention. However, knowledge of the kinetic profiles of MPs in fish remains fragmentary. In this study, we conducted exposure and depuration tests of the following fluorescent-labeled MPs: polyethylene (PE; sphere with 200 or 20 µm diameter) and polystyrene (PS; sphere with 20 or 2 µm diameter) using juvenile Japanese medaka (Oryzias latipes). Read More

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