Functional diversity in biters: the evolutionary morphology of the oral jaw system in pacus, piranhas and relatives (Teleostei: Serrasalmidae)

2019 ◽  
Vol 127 (4) ◽  
pp. 722-741 ◽  
Author(s):  
Alessia Huby ◽  
Aurélien Lowie ◽  
Anthony Herrel ◽  
Régis Vigouroux ◽  
Bruno Frédérich ◽  
...  
Keyword(s):  
Morphological Traits ◽  
Morphological Diversity ◽  
Evolutionary Morphology ◽  
Trophic Specialization ◽  
Jaw Muscles ◽  
Lower Jaw ◽  
Carnivorous Species ◽  
Herbivorous Species ◽  
Fish Group

Abstract Serrasalmid fishes form a highly specialized group of biters that show a large trophic diversity, ranging from pacus able to crush seeds to piranhas capable of cutting flesh. Their oral jaw system has been hypothesized to be forceful, but variation in bite performance and morphology with respect to diet has not previously been investigated. We tested whether herbivorous species have higher bite forces, larger jaw muscles and more robust jaws than carnivorous species. We measured in vivo and theoretical bite forces in 27 serrasalmid species. We compared the size of the adductor mandibulae muscle, the jaw mechanical advantages, the type of jaw occlusion, and the size and shape of the lower jaw. We also examined the association between bite performance and functional morphological traits of the oral jaw system. Contrary to our predictions, carnivorous piranhas deliver stronger bites than their herbivorous counterparts. The size of the adductor mandibulae muscle varies with bite force and muscles are larger in carnivorous species. Our study highlights an underestimated level of functional morphological diversity in a fish group of exclusive biters. We provide evidence that the trophic specialization towards carnivory in piranhas results from changes in the configuration of the adductor mandibulae muscle and the lower jaw shape, which have major effects on bite performance and bite strategy.

scholarly journals Experimental Study on Strength Evaluation Applied for Teeth Extraction: An In Vivo Study

2013 ◽  
Vol 7 (1) ◽  
pp. 20-26 ◽  
Author(s):  
Marco Cicciù ◽  
Ennio Bramanti ◽  
Fabrizio Signorino ◽  
Alessandra Cicciù ◽  
Francesco Sortino
Keyword(s):  
Strain Measurement ◽  
In Vivo Study ◽  
Microsoft Excel ◽  
Premolar Extraction ◽  
Lower Jaw ◽  
System Data ◽  
Computerized System ◽  
Teeth Extraction

Purpose: The aim of this work was to analyse all the applied movements when extracting healthy upper and lower jaw premolars for orthodontic purposes. The authors wanted to demonstrate that the different bone densities of the mandible and maxilla are not a significant parameter when related to the extraction force applied. The buccal and palatal rocking movements, plus the twisting movements were also measured in this in-vivo study during premolar extraction for orthodontic purposes. Methods: The physical strains or forces transferred onto the teeth during extraction are the following three movements: gripping, twisting, and traction. A strain measurement gauge was attached onto an ordinary dentistry plier. The strain measurement gauge was constituted with an extensimetric washer with three 45º grids. The system operation was correlated to the variation of electrical resistance. Results: The variations of resistance (∆R) and all the different forces applied to the teeth (∆V) were recorded by a computerized system. Data results were processed through Microsoft Excel. The results underlined the stress distribution on the extracted teeth during gripping, twisting and flexion. Conclusions: The obtained data showed that the strength required to effect teeth extraction is not influenced by the quality of the bone but is instead influenced by the shape of the tooth’s root.

Cellular patterning of fast and slow fibres in the intermandibularis muscle of chick embryos

Development ◽  
1993 ◽  
Vol 117 (1) ◽  
pp. 329-339 ◽  
Author(s):  
L.G. Robson
Keyword(s):  
Cell Types ◽  
Specific Pattern ◽  
Slow Muscle ◽  
Limb Bud ◽  
Muscle Fibres ◽  
Chick Embryos ◽  
Myogenic Cells ◽  
Lower Jaw ◽  
Cellular Pattern

The way in which the pattern of cell types arises during development of individual muscles was explored. The pattern of cellular differentiation resulting from the synthesis of particular fast and slow myosin heavy chains (MyHC) was investigated in the intermandibularis muscle in the lower jaw of chick embryos. The intermandibularis muscle has a proximodistal pattern of fibre type distribution. The distal region of the muscle contains a ratio of 1.5:1 fast to slow muscle fibres, which increases to > 2.5:1 in the proximal region. The intermandibularis muscle is assembled in a proximodistal sequence, with both fast and slow muscle cells differentiating within the earliest muscle and then establishing the specific pattern of cell types. This pattern is not dependent on a specific innervation source, as normal lower jaw muscles develop and the intermandibularis has the same graded cellular pattern when the mandibular primordium is grafted to the limb bud stump. Micromass cultures were used to explore the pool of potentially myogenic cells that are available to construct the muscles. Even before the muscle differentiates in vivo, both fast and slow cells are present in the primordia. These potentially myogenic cells are already distributed within the primordium in a proximodistal fashion that mimics the cellular pattern found in the muscle that develops.

Evaluation of the morphological diversity of tea roses (Rosa x odorata) based on phenotypic traits

2020 ◽  
Vol 18 (3) ◽  
pp. 149-158
Author(s):  
Bixuan Cheng ◽  
Chao Yu ◽  
Heling Fu ◽  
Lijun Zhou ◽  
Le Luo ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Correlation Analysis ◽  
Morphological Traits ◽  
Significant Positive Correlation ◽  
Flower Colour ◽  
Principal Component ◽  
Morphological Diversity ◽  
Component Analysis ◽  
Germplasm Resources ◽  
Trait Correlation

AbstractRosa x odorata (sect. Chinenses, Rosaceae) is an important species distributed only in Yunnan Province, China. There is an abundance of wild variation within the species. Using 22 germplasm resources collected from the wild, as well as R. chinensis var. spontanea, R. chinensis ‘Old Blush’ and R. lucidissima, this study involved morphological variation analysis, inter-trait correlation analysis, principal component analysis and clustering analysis based on 16 morphological traits. This study identified a high degree of morphological diversity in R. x odorata germplasm resources and the variation coefficients had a distribution range from 18.00 to 184.04%. The flower colour had the highest degree of variation, while leaflet length/width had the lowest degree of variation. Inter-trait correlation analysis revealed that there was an extremely significant positive correlation between leaflet length and leaflet width. There was also a significant positive correlation between the number of petals and duration of blooming, and the L* and a* values of flower colour were significantly negatively correlated. Principal component analysis screened five principal components with the highest cumulative contribution rate (81.679%) to population variance. Among the 16 morphological traits, style length, sepal width, flower diameter, flower colour, leaflet length and leaflet width were important indices that influenced the morphology of R. x odorata. This study offers guidance for the further development and utilization of R. x odorata germplasm resources.

scholarly journals Fruit micromorphology in the Umbelliferae in Siberia and patterns of morphological diversity in the family

2020 ◽  
Vol 19 (1) ◽  
pp. 44-48
Author(s):  
T. A. Ostroumova
Keyword(s):  
Cell Wall ◽  
Species Identification ◽  
Morphological Traits ◽  
Morphological Diversity ◽  
Epicuticular Wax ◽  
Cell Form ◽  
Cell Arrangement ◽  
The Family ◽  
Cultivated Species ◽  
Micromorphological Characters

Fruit micromorphology of all 98 native, adventive, and cultivated species of the Umbelliferae of Siberiawas studied. We described simple hairs (size, shape, fine relief of cell wall, and tufted hairs), multicellular spines andglochidia, cell arrangement, cell form, fine relief (cuticular foldings), epicuticular wax, and stomata. We discuss thediversity of micromorphological characters and their value for species identification and taxonomy. We state numerousexamples of parallel variability of morphological traits in different subdivisions of the family

scholarly journals Phytopathogenic Cercosporoid Fungi—From Taxonomy to Modern Biochemistry and Molecular Biology

2020 ◽  
Vol 21 (22) ◽  
pp. 8555
Author(s):  
Urszula Świderska-Burek ◽  
Margaret E. Daub ◽  
Elizabeth Thomas ◽  
Magdalena Jaszek ◽  
Anna Pawlik ◽  
...  
Keyword(s):  
Morphological Traits ◽  
Point Of View ◽  
Plant Diseases ◽  
Ros Production ◽  
Oxygen Species ◽  
Biosynthesis Pathway ◽  
Economic Point ◽  
Cercosporoid Fungi ◽  
Different Levels

Phytopathogenic cercosporoid fungi have been investigated comprehensively due to their important role in causing plant diseases. A significant amount of research has been focused on the biology, morphology, systematics, and taxonomy of this group, with less of a focus on molecular or biochemical issues. Early and extensive research on these fungi focused on taxonomy and their classification based on in vivo features. Lately, investigations have mainly addressed a combination of characteristics such as morphological traits, host specificity, and molecular analyses initiated at the end of the 20th century. Some species that are important from an economic point of view have been more intensively investigated by means of genetic and biochemical methods to better understand the pathogenesis processes. Cercosporin, a photoactivated toxin playing an important role in Cercospora diseases, has been extensively studied. Understanding cercosporin toxicity in relation to reactive oxygen species (ROS) production facilitated the discovery and regulation of the cercosporin biosynthesis pathway, including the gene cluster encoding pathway enzymes. Furthermore, these fungi may be a source of other biotechnologically important compounds, e.g., industrially relevant enzymes. This paper reviews methods and important results of investigations of this group of fungi addressed at different levels over the years.

scholarly journals Detection of Bone Defects Using CBCT Exam in an Italian Population

2017 ◽  
Vol 2017 ◽  
pp. 1-4 ◽  
Author(s):  
Gianluca Gambarini ◽  
Gabriele Miccoli ◽  
Gianfranco Gaimari ◽  
Deborah Pompei ◽  
Andrea Pilloni ◽  
...  
Keyword(s):  
American Association ◽  
Dental Treatment ◽  
Third Molar ◽  
Common Finding ◽  
Italian Population ◽  
Third Molar Extraction ◽  
Lower Jaw ◽  
Definition Of ◽  
Implant Treatment

Background. The aim of this study was to evaluate the in vivo incidence and the location of fenestrations in a young Italian population by using CBCT. Materials and Methods. Fifty patients who had previously performed CBCT for planning third molar extraction or orthodontic therapy were selected for the study. No previous dental treatment had been performed on these patients. Overall, 1,395 teeth were evaluated. Root fenestrations were identified according to the definition of Davies and the American Association of Endodontists. Data was collected and statistically analyzed. Results. Fenestrations were observed in 159 teeth out of 1,395 (11% of teeth). In the lower jaw, we found 68 fenestrations (5%) and 91 in the maxilla (6,5%). Incisors were the teeth with the highest incidence of fenestrations. Conclusion. The relative common finding (11%) of fenestration supports the need for CBCT exams before any surgical/implant treatment to avoid complications related to the initial presence of fenestrations. CBCT was found to be an effective and convenient tool for diagnosing fenestration.

Mechanisms of proximal proton secretion in BBM of herbivorous, omnivorous, and carnivorous species

1995 ◽  
Vol 269 (1) ◽  
pp. R104-R112 ◽  
Author(s):  
M. Duplain ◽  
J. Noel ◽  
A. Fleser ◽  
V. Marshansky ◽  
A. Gougoux ◽  
...  
Keyword(s):  
Proton Pump ◽  
Proximal Tubules ◽  
Acid Base Balance ◽  
Proton Secretion ◽  
Carnivorous Species ◽  
Base Balance ◽  
Orange Fluorescence ◽  
Herbivorous Species ◽  
Species Specific ◽  
Triton X

The mechanisms of proton secretion by the proximal brush-border membrane (BBM) were compared in carnivorous (dog), omnivorous (human, pig, rat), and herbivorous (rabbit, hamster) species. The activity of the proton pump (V-type bafilomycin-sensitive H(+)-adenosinetriphosphatase) and of the Na+/H+ exchanger (amiloride-sensitive quenching of acridine orange fluorescence), the two major proton secretion mechanisms, was measured. The enzymatic activity of the H(+)-adenosinetriphosphatase activity was measured in intact (endosomes) and solubilized (0.1% deoxycholate or Triton X-100) BBM vesicles isolated by conventional Mg2+ precipitation techniques. In all species, but not in humans, the fraction of the ATP turnover energizing the proton pump (bafilomycin-sensitive respiration) was also measured in isolated proximal tubules. Significant differences in acid transport mechanisms were noted between species, with the proton pump predominating in the BBM of carnivorous species and the Na+/H+ exchanger predominating in the BBM of herbivorous species. The fraction of respiration suppressible by bafilomycin in proximal tubules was also different in all the species considered. This may indicate a different organization of proximal H+ transport related to the species-specific menace to acid-base balance.

Form and function: structural analysis in evolutionary morphology

Paleobiology ◽  
1981 ◽  
Vol 7 (4) ◽  
pp. 430-442 ◽  
Author(s):  
George V. Lauder
Keyword(s):  
Structural Complexity ◽  
Morphological Diversity ◽  
Structural Features ◽  
Constrained Systems ◽  
Hierarchical Organization ◽  
Evolutionary Morphology ◽  
Form And Function ◽  
Historical Factors ◽  
Functional Patterns ◽  
And Function

A theoretical approach to the analysis of historical factors (Raup 1972) in evolutionary morphology is presented which addresses transformational hypotheses about structural systems. This (structural) approach to testing historical hypotheses about phylogenetic constraints on form and function and structural and functional versatility involves (1) the reconstruction of nested sets of structural features in monophyletic taxa, (2) the use of general or emergent organizational properties of structural and functional systems (as opposed to uniquely derived morphological features), and (3) the comparative examination of the consequences for structural and functional diversity of these general features in related monophyletic taxa.Three examples of emergent organizational properties are considered: structural complexity, repetition of parts, and the decoupling of primitively constrained systems. Two classes of hypotheses about the evolution of design are proposed. Transformational hypotheses concern historical pathways of change in form as a consequence of general organizational features which are primitive for a lineage. Relational hypotheses involve correlations between structure-function networks primitive for a clade and morphological diversity both between and within terminal taxa. To the extent that transformational and relational hypotheses about form are corroborated, they provide evidence of underlying regularity in the transformation of organic design that may be a consequence of the hierarchical organization of structural and functional patterns in organisms.

scholarly journals Identification and characterization of morphological diversity of Lemba (Curculigo latifolia) in East Kalimantan, Indonesia

2017 ◽  
Vol 18 (4) ◽  
pp. 1367-1376
Author(s):  
INCE RADEN ◽  
CANDRA CATUR NUGROHO ◽  
SYAHRANI SYAHRANI
Keyword(s):  
Morphological Traits ◽  
Quantitative Traits ◽  
Phenotypic Variability ◽  
Morphological Diversity ◽  
Qualitative Traits ◽  
Qualitative And Quantitative ◽  
East Kalimantan ◽  
Quantitative And Qualitative Traits ◽  
Identification And Characterization

Raden I, Nugroho CC. Syahrani. 2017. Identification and characterization of morphological diversity of Lemba (Curculigo latifolia) in East Kalimantan, Indonesia. Biodiversitas 18: 1367-1376. Lemba (Curculigo latifolia) is Kalimantan’s land prospective for commercial cultivation because its leaf fiber has been traditionally utilized as fiber source for ulap doyo woven cloth; its fruit as sweetener; and its root as medicinal herb. To this days, only a few of research has been conducted on lemba in East Kalimantan or even in Indonesia, including studies on lemba plant phenotype suitable for weaving material. Thus, a research about identification and morphological characterization of lemba cultivars is necessary to identify and characterize lemba plant in East Kalimantan to reveal phenotypic variability in both quantitative and qualitative traits that can be utilized as the source of germplasm for the plant breeding program. This study was carried out in three Sub-districts, i.e.: Tenggarong Sub-district (Kutai Kartanegara District), Kota Bangun Subdistrict (Kutai Kartanegara District), and Jempang Sub-district (West Kutai District). Data collection was done by observation, and measurement of quantitative and qualitative traits of lemba plant. Descriptive analysis was applied on the morphological traits data, while correlation analysis was performed to reveal relationship between the qualitative and quantitative morphological traits by using software Minitab v.14.12. Phenotypic variability was determined based on the standard deviation. Principal component analysis and cluster analysis of the data were performed by using software SPSS v.11.6. The variance value of the 33 observed lemba plant accessions from the three Sub-districts indicated that the phenotypic variability of the qualitative traits was narrow while that of the quantitative traits was broad. There are three principal components that account for the observed variability with a cumulative variance of 96% which is obtained from 19 observed traits. Cluster analysis at similarity 95% indicates that there are five lemba accessions groups based on only qualitative, only quantitative, or based on combined qualitative and quantitative traits.

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