scholarly journals The ammonoids from the Three Forks Shale (Late Devonian) of Montana

Fossil Record ◽  
2006 ◽  
Vol 9 (2) ◽  
pp. 198-212 ◽  
Author(s):  
D. Korn ◽  
A. Titus
Keyword(s):  
Late Devonian ◽  
Growth Stages ◽  
Adult Growth ◽  
Ammonoid Fauna ◽  
Three Forks ◽  
Stratigraphic Position

Abstract. The ammonoid fauna from the Late Devonian Three Forks Shale of Montana is revised. Six taxa were recognised, which belong to the genera Tornoceras, Pernoceras, Raymondiceras, Platyclymenia, Pleuroclymenia, and Carinoclymenia. The ammonoid assemblage suggests a stratigraphic position within the middle Famennian, most probably the Platyclymenia annulata Zone. The ammonoids display extreme septal crowding in intermediate as well as adult growth stages, which can be regarded as evidence for instable palaeoecological conditions during lifetime of the animals. Die Ammonoideenfauna aus dem oberdevonischen Three Forks Shale von Montana wird revidiert. Sechs Taxa werden unterschieden; sie gehören zu den Gattungen Tornoceras, Pernoceras, Raymondiceras, Platyclymenia, Pleuroclymenia und Carinoclymenia. Die Ammonoideen-Vergesellschaftung spricht für eine stratigraphische Position im mittleren Famennium, wahrscheinlich in der Platyclymenia annulata Zone. Die Ammonoideen zeigen auffällige Drängung der Septen in intermediären und adulten Wachstumsstadien, die als Hinweis auf instabile Lebensbedingungen für die Tiere gewertet werden kann. doi:10.1002/mmng.200600008

Induced Defense: Herbivory on Juvenile vs. Adult Growth Stages of Trees

2009 ◽  
pp. 91-96
Author(s):  
Dietland Müller-Schwarze
Keyword(s):  
Induced Defense ◽  
Growth Stages ◽  
Adult Growth

scholarly journals A First Insight into the Structural and Functional Comparison of Environmental Microbiota in Freshwater Turtle Chinemys reevesii at Different Growth Stages under Pond and Greenhouse Cultivation

2020 ◽  
Vol 8 (9) ◽  
pp. 1277 ◽  
Author(s):  
Aiguo Zhou ◽  
Shaolin Xie ◽  
Di Sun ◽  
Pan Zhang ◽  
Han Dong ◽  
...  
Keyword(s):  
Water Quality ◽  
Pathogenic Bacteria ◽  
Bacterial Species ◽  
Freshwater Turtle ◽  
Growth Stages ◽  
Rrna Gene ◽  
Important Indicator ◽  
Adult Growth ◽  
Greenhouse Cultivation ◽  
Different Growth Stages

The microbial community structure of water is an important indicator for evaluating the water quality of the aquaculture environment. In this study, the investigation and comparison of the bacterial communities of pond cultivation (PC) and greenhouse cultivation (GC) between hatchling, juvenile, and adult growth stages of C. reevesii were performed. In addition, the V4 regions of the 16S rRNA gene were sequenced. The Chao1 richness estimator of the PC group was significantly higher than that of the GC group. The beta diversity showed that the microbiotas of the two groups were isolated from each other. The dominant phyla were Cyanobacteria, Proteobacteria, Actinobacteria, Bacteroidetes, Verrucomicrobia, and Planctomycetes in the PC group and Proteobacteria, Bacteroidetes, Firmicutes, Cyanobacteria, Chloroflexi, and Actinobacteria in the GC group. Both the numbers and the types of Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway annotations differed between the PC and GC groups. The prediction of bacterial phenotype implied that the GC environment is more likely to deteriorate, and turtles are more susceptible to pathogens than those of the PC environment. In addition, a total of nine potential pathogenic bacteria were identified and the correlation of environmental factors analyses showed significant differences of bacterial species between the PC and GC groups, while the potential pathogenic bacteria showed significant correlation with the stocking density, temperature, pH, orthophosphate (PO4-P), and dissolved oxygen (DO) in both the PC and GC groups. Noticeably, this is the first report to describe the different microbiota characteristics of the different cultivation environments in the different growth stages of C. reevesii, which will provide valuable data for water quality adjustment, disease prevention, and the healthy breeding of turtles.

Rare representatives in the ammonoid fauna from Büdesheim (Cephalopoda, Eifel, Late Devonian) and the role of heterochrony

2013 ◽  
Vol 269 (2) ◽  
pp. 111-124 ◽  
Author(s):  
Dieter Korn ◽  
Jürgen Bockwinkel ◽  
Volker Ebbighausen ◽  
Sonny A. Walton
Keyword(s):  
Late Devonian ◽  
Ammonoid Fauna

Understanding of Vertical and Horizontal Pressure Barriers in the Naturally Fractured Carbonate Field

2021 ◽  
Author(s):  
Abdulmalik Ibragimov ◽  
Nurbolat Kalmuratov
Keyword(s):  
Late Devonian ◽  
Growth Stages ◽  
Rock Property ◽  
Field Development ◽  
Sequence Stratigraphic ◽  
Sector Model ◽  
Fractured Carbonate ◽  
Horizontal Pressure ◽  
Simulation Results ◽  
Depositional Cycles

Abstract The Karachaganak field is a massive reef carbonate structure. The main reservoir is of the late Devonian-Carboniferous age, where sequence stratigraphic cycles of progradation and aggradation defining the growth stages of the carbonate build-up have been revealed. Vertical and horizontal semiconductive barriers was identified in the reservoir during the field development. It was assumed that these barriers are located at the boundaries of the changing depositional cycles, which took place during the reef structure growth. According to the simulation results on a sector model of the reservoir it was determined that the pressure barriers can be developed due to different fracture intensities observed in the reservoir and not because of rock property as such. The reason for the different fracture densities may be associated with compaction during primary diagenesis and may have a sync-depositional nature, which can be seen on carbonate structure outcrops.

scholarly journals Ontogeny and sexual dimorphism in the Middle/Late Devonian rhomboentomozoid ostracod <i>Franklinella</i>

2002 ◽  
Vol 21 (1) ◽  
pp. 9-16 ◽  
Author(s):  
Ewa Olempska
Keyword(s):  
Sexual Dimorphism ◽  
Morphological Features ◽  
Late Devonian ◽  
Growth Stages ◽  
Holy Cross Mountains ◽  
Contact List

Abstract. A large number of three-dimensionally preserved, pyritized specimens of different instars of the rhomboentomozoid ostracod Franklinella (Franklinella) lysogorensis n. sp. were recovered from a mudstone of the Givetian/Frasnian transition beds at Wzdół in the Holy Cross Mountains, Poland. Seven growth stages are identified. Sexual dimorphism is manifested by differences of ribbing pattern in adults. Within the superfamily Entomozoacea, the presence of two types of sexual dimorphism is suggested: ornamental in rhomboentomozoids and domiciliar in entomoprimitiids. Formerly poorly known morphological features of the rhomboentomozoids, including the anteroventral indentation and a contact list ornamented by fine striation, are described.

Implications of spore evidence for Late Devonian age of the Piskahegan Group, southwestern New Brunswick

1988 ◽  
Vol 25 (9) ◽  
pp. 1349-1364 ◽  
Author(s):  
D. C. McGregor ◽  
S. R. McCutcheon
Keyword(s):  
New Brunswick ◽  
Eastern Europe ◽  
Volcanic Rocks ◽  
Early Carboniferous ◽  
Surface Expression ◽  
Alluvial Fan ◽  
Late Devonian ◽  
Red Sandstone ◽  
Stratigraphic Position ◽  
Devonian Age

The predominantly volcanic Piskahegan Group has commonly been considered Early Carboniferous, based on its stratigraphic position. However, spores recently discovered in the Carrow Formation, an alluvial fan deposit in the exocaldera facies, indicate that most, if not all, of the group is of Late Devonian (late Famennian) age. The spore assemblage includes several species reported previously from Ireland, Belgium, and eastern Europe, some of them apparently restricted to the southern parts of the Old Red Sandstone Continent in Late Devonian time. Comparison of records of earliest occurrences suggests that the incoming of some species was diachronous. Volcanic rocks of the Piskahegan Group are coeval with post-Acadian, tin–tungsten-bearing granites elsewhere in New Brunswick and are considered the surface expression of plutonism that resulted from Acadian continental collison.

Production and Molecular Cytogenetic Characterization of a Durum Wheat-Thinopyrum elongatum 7E Disomic Addition Line with Resistance to Fusarium Head Blight

2017 ◽  
Vol 153 (3) ◽  
pp. 165-173 ◽  
Author(s):  
Huiping Liu ◽  
Yi Dai ◽  
Dawn Chi ◽  
Shuai Huang ◽  
Haifeng Li ◽  
...  
Keyword(s):  
Durum Wheat ◽  
Fusarium Head Blight ◽  
Visual Observation ◽  
Growth Stages ◽  
Addition Line ◽  
Head Blight ◽  
Wheat Improvement ◽  
Adult Growth ◽  
Cytogenetic Characterization ◽  
Thinopyrum Elongatum

Wheatgrass, Thinopyrum elongatum (2n = 2x = 14, EE), is an important wild relative of wheat with many excellent traits, including resistance to Fusarium head blight (FHB), that can be used for durum wheat improvement. Through hybridization of the durum cultivar “Langdon” with the amphiploid 8801 (AABBEE), a disomic alien addition line (2n = 30) with a pair of Th. elongatum 7E chromosomes was obtained and confirmed using chromosome-specific molecular markers of Th. elongatum and genomic in situ hybridization (GISH). This line is meiotically and reproductively stable, generally forming 15 bivalents at meiosis including 14 pairs from Langdon and 1 from Th. elongatum with 2 chiasmata each as revealed by GISH analysis. At the adult growth stages under field conditions, this addition line shows high resistance to FHB, with less than 16% infection on visual observation in 2 years (2014 and 2015). This addition line is shorter in height and has narrower leaves and shorter spikes as compared to its parent Langdon. So the linkage group 7E might be a further source of wheat improvement by targeted introgression approaches.

scholarly journals Mining Vavilov’s Treasure Chest of Wheat Diversity for Adult Plant Resistance to Puccinia triticina

Plant Disease ◽  
2017 ◽  
Vol 101 (2) ◽  
pp. 317-323 ◽  
Author(s):  
Adnan Riaz ◽  
Naveenkumar Athiyannan ◽  
Sambasivam Periyannan ◽  
Olga Afanasenko ◽  
Olga Mitrofanova ◽  
...  
Keyword(s):  
Plant Resistance ◽  
Adult Plant Resistance ◽  
Control Method ◽  
Plant Genetic Resources ◽  
Puccinia Triticina ◽  
Future Research ◽  
Adult Plant ◽  
Growth Stages ◽  
Sources Of Resistance ◽  
Adult Growth

Leaf rust (LR) caused by Puccinia triticina, is among the most important diseases of wheat (Triticum aestivum L.) crops globally. Deployment of cultivars incorporating genetic resistance, such as adult plant resistance (APR) or all-stage resistance, is considered the most sustainable control method. APR is preferred for durability because it places lower selection pressure on the pathogen and is often polygenic. In the search for new sources of APR, here we explored a diversity panel sourced from the N. I. Vavilov Institute of Plant Genetic Resources. Based on DNA marker screening, 83 of the 300 lines were deemed to carry known APR genes; namely, Lr34, Lr46, and Lr67. Interestingly, lines carrying Lr67 were mostly landraces from India and Pakistan, reconfirming the likely origin of the gene. Rapid phenotypic screening using a method that integrates assessment at both seedling and adult growth stages under accelerated growth conditions (i.e., constant light and controlled temperature) identified 50 lines carrying APR. Levels of APR corresponded well with phenotypes obtained in a field nursery inoculated using the same pathotype (R2 = 0.82). The second year of field testing, using a mixture of pathotypes with additional virulence for race-specific APR genes (Lr13 and Lr37), identified a subset of 13 lines that consistently displayed high levels of APR across years and pathotypes. These lines provide useful sources of resistance for future research. A strategy combining rapid generation advance coupled with phenotyping under controlled conditions could accelerate introgression of these potentially novel alleles into adapted genetic backgrounds.

scholarly journals Molecular Mapping and Validation of SrND643: A New Wheat Gene for Resistance to the Stem Rust Pathogen Ug99 Race Group

2015 ◽  
Vol 105 (4) ◽  
pp. 470-476 ◽  
Author(s):  
Bhoja R. Basnet ◽  
Sukhwinder Singh ◽  
Eric E. Lopez-Vera ◽  
Julio Huerta-Espino ◽  
Sridhar Bhavani ◽  
...  
Keyword(s):  
Stem Rust ◽  
Molecular Mapping ◽  
Close Association ◽  
Recombinant Inbred Lines ◽  
Triticum Aestivum L ◽  
Wheat Breeding ◽  
Growth Stages ◽  
Nucleotide Polymorphisms ◽  
Adult Growth ◽  
Rust Pathogen

This study reports the identification of a new gene conferring resistance to the Ug99 lineage of races of Puccinia graminis f. sp. tritici in wheat (Triticum aestivum L.). Because the virulent races of stem rust pathogen continue to pose a serious threat in global wheat production, identification and molecular characterization of new resistance genes remains of utmost important to enhance resistance diversity and durability in wheat germplasm. Advanced wheat breeding line ‘ND643/2*Weebill1’ carries a stem rust resistance gene, temporarily designated as SrND643, effective against the Ug99 group of P. graminis f. sp. tritici races at both seedling and adult growth stages. This study was conducted to map the chromosomal location of SrND643 and identify closely linked molecular markers to allow its selection in breeding populations. In total, 123 recombinant inbred lines, developed by crossing ND643/2*Weebill1 with susceptible line ‘Cacuke’, were evaluated for stem rust response in field nurseries at Njoro, Kenya, during two growing seasons in 2010, and were genotyped with DNA markers, including Diversity Arrays Technology, simple sequence repeats (SSR), and single-nucleotide polymorphisms. Linkage mapping tagged SrND643 at the distal end of chromosome 4AL, showing close association with SSR markers Xgwm350 (0.5 centimorgans [cM]), Xwmc219 (4.1 cM), and Xwmc776 (2.9 cM). The race specificity of SrND643 is different from that of Sr7a and Sr7b, indicating that the resistance is conferred by a gene at a new locus or by a new allele of Sr7. The flanking markers Xgwm350 and Xwmc219 were predictive of the presence of SrND643 in advanced germplasm, thus validating the map location and their use in marker-assisted selection.

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