scholarly journals Morphological evolution of through gorges in the stripe karst of the ridge Dzevrinska greda: North-eastern Serbia

2005 ◽  
Vol 85 (1) ◽  
pp. 3-10
Author(s):  
Jelena Calic ◽  
Marko Milosevic
Keyword(s):  
Morphological Evolution ◽  
Morphological Features ◽  
Drainage Network ◽  
Surface Drainage ◽  
North Eastern

The paper presents the main characteristics of the limestone ridge Dzevrinska Greda in north-eastern Serbia, which is a typical example of stripe karst (sub-type of contact karst). Dimensions and elongated shape of the limestone outcrop, as well as its position in relation to the surface drainage network, have led to formation of a number of short through gorges. The conditions of their formation and certain morphological features pointing to phases of their development are discussed in the paper. One of the indicators was the analysis of cave passages positions, which in most cases points to cave development in phreatic conditions. This means that the incision of through gorges is more recent than speleogenesis.

Late Cretaceous (Maastrichtian) crocodyliforms from north-eastern Iberia: a first attempt to explain the crocodyliform diversity based on tooth qualitative traits

2019 ◽  
Vol 189 (2) ◽  
pp. 584-617 ◽  
Author(s):  
Alejandro Blanco ◽  
Eduardo Puértolas-Pascual ◽  
Josep Marmi ◽  
Blanca Moncunill-Solé ◽  
Sergio Llácer ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Feeding Habits ◽  
Morphological Features ◽  
Taxonomic Significance ◽  
Environmental Preferences ◽  
Qualitative Traits ◽  
North Eastern

Abstract During recent years, knowledge about crocodyliform diversity of the uppermost Cretaceous from Europe has been substantially improved. Palaeontological efforts have also been focused on microvertebrate diversity and its palaeoecological implications. Isolated crocodylomorph teeth are, by far, one of the most frequently recovered elements in microvertebrate samples. In the present paper, morphological features of crocodylomorph teeth collected throughout the complete Maastrichtian series of the southern Pyrenean basin (north-eastern Spain), together with several mandibular remains, are described and analysed. Teeth were grouped in morphotypes and their taxonomic significance is discussed. The results highlight a diverse crocodylomorph assemblage in this area throughout the Maastrichtian. In addition, feeding habits and environmental preferences are inferred for the identified taxa according to dental features, occurrences and taphonomy.

scholarly journals Tuber aztecorum sp. nov., a truffle species from Mexico belonging to the Maculatum clade (Tuberaceae, Pezizales)

MycoKeys ◽  
2018 ◽  
Vol 30 ◽  
pp. 61-72 ◽  
Author(s):  
Gonzalo Guevara-Guerrero ◽  
Gregory Bonito ◽  
Matthew E. Smith ◽  
Roseanne Healy ◽  
Arthur Grupe ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
New Species ◽  
Related Species ◽  
Sequence Variation ◽  
Morphological Features ◽  
Its Rdna ◽  
Central Mexico ◽  
North Eastern ◽  
A New Species

A new species of truffle, T.aztecorum, is described from central Mexico. Tuberaztecorum can be distinguished from other related Tuber species synoptically by a combination of morphological features including ascospore size, pellis cells with irregular thickness, cystidia, ascoma colour and associated host (Abiesreligiosa an endemic Abies species from central Mexico); sequence variation on the ITS rDNA also distinguishes T.aztecorum from related species. A phylogenetic analysis of the ITS rDNA demonstrates that T.aztecorum belongs to the Maculatum clade and is unique from other similar small, white-cream coloured Tuber species distributed in north-eastern Mexico such as T.castilloi and T.guevarai.

scholarly journals Diversity trends and their ontogenetic basis: an exploration of allometric disparity in rodents

2009 ◽  
Vol 277 (1685) ◽  
pp. 1227-1234 ◽  
Author(s):  
Laura A. B. Wilson ◽  
Marcelo R. Sánchez-Villagra
Keyword(s):  
Evolutionary History ◽  
Morphological Evolution ◽  
Ecological Factors ◽  
Morphological Diversity ◽  
Taxonomic Diversity ◽  
Morphological Integration ◽  
Morphological Features ◽  
Phylogenetic Relations ◽  
Ontogenetic Trajectories ◽  
Efficient Processing

It has been hypothesized that most morphological evolution occurs by allometric differentiation. Because rodents encapsulate a phenomenal amount of taxonomic diversity and, among several clades, contrasting levels of morphological diversity, they represent an excellent subject to address the question: how variable are allometric patterns during evolution? We investigated the influence of phylogenetic relations and ecological factors on the results of the first quantification of allometric disparity among rodents by exploring allometric space, a multivariate morphospace here derived from, and encapsulating all, the ontogenetic trajectories of 34 rodent species from two parallel phylogenetic radiations. Disparity was quantified using angles between ontogenetic trajectories for different species and clades. We found an overlapping occupation of allometric space by muroid and hystricognath species, revealing both clades possess similar abilities to evolve in different directions of phenotypic space, and anatomical diversity does not act to constrain the labile nature of allometric patterning. Morphological features to enable efficient processing of food serve to group rodents in allometric space, reflecting the importance of convergent morphology, rather than shared evolutionary history, in the generation of allometric patterns. Our results indicate that the conserved level of morphological integration found among primates cannot simply be extended to all mammals.

scholarly journals Variability of morphological features, bud burst and flowering of Norway spruce (Picea abies [L.] Karst.) in the seed orchard of the Bielsk Forest District

2015 ◽  
Vol 76 (4) ◽  
pp. 388-400
Author(s):  
Sławomir Mioduszewski ◽  
Marek Rzońca
Keyword(s):  
Norway Spruce ◽  
Seed Orchard ◽  
Morphological Features ◽  
Bud Burst ◽  
Stem Form ◽  
The North ◽  
Crown Width ◽  
North Eastern ◽  
Female Flowering ◽  
Forest District

Abstract The main aim of this paper was to characterize Norway spruce clones in terms of bud burst, flowering and morphological features. Observation and measurements were carried out in the Norway spruce seed orchard of the Bielsk Forest District in the north-eastern part of Poland. The seed orchard was established in 1989 and consists of 428 grafts of over 37 trees from the Białowieża Primeval Forest. An assessment of bud burst, stem forking, stem form, crown width, branch thickness, vitality, flowering and fructification as well as diameter measurements was done in 2013 and 2014. The results showed variability of morphological features among different clones as well as within individual clones. Differences among clones in spring bud development, stem form and branch thickness were statistically significant. Additionally, a positive correlation between male and female flowering was observed. The research also confirmed an influence of the healthiness of the grafts on seed production with trees in a weakened state producing more seeds.

scholarly journals Experimental Study on the Influence of an Artificial Reef on Cross-Shore Morphodynamic Processes of a Wave-Dominated Beach

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2947 ◽  
Author(s):  
Yue Ma ◽  
Cuiping Kuang ◽  
Xuejian Han ◽  
Haibo Niu ◽  
Yuhua Zheng ◽  
...  
Keyword(s):  
Morphological Evolution ◽  
Artificial Reef ◽  
Morphological Features ◽  
Coastal Protection ◽  
Swash Zone ◽  
State Transformation ◽  
Irregular Wave ◽  
Wave Flume ◽  
The Cross ◽  
Run Up

Artificial reefs are being implemented around the world for their multi-functions including coastal protection and environmental improvement. To better understand the hydrodynamic and morphodynamic roles of an artificial reef (AR) in beach protection, a series of experiments were conducted in a 50 m-long wave flume configured with a 1:10 sloping beach and a model AR (1.8 m long × 0.3 m high) with 0.2 m submergence depth. Five regular and five irregular wave conditions were generated on two types of beach profiles (with/without model AR) to study the cross-shore hydrodynamic and morphological evolution process. The influences of AR on the processes are concluded as follows: (1) AR significantly decreases the incident wave energy, and its dissipation effect differs for higher and lower harmonics under irregular wave climates; (2) AR changes the cross-shore patterns of hydrodynamic factors (significant wave height, wave skewness and asymmetry, and undertow), leading to the movement of shoaling and breaking zones; (3) the beach evolution is characterized by a sandbar and a scarp which respectively sit at a higher and lower location on the profile with AR than natural beach without AR; (4) the cross-shore morphological features indicate that AR can lead to beach state transformation toward reflective state; (5) the scarp retreat process can be described by a model where the scarp location depends linearly on the natural exponential of time with the fitting parameters determined by wave run-up reduced by AR. This study demonstrates cross-shore effects of AR as a beach protection structure that changes wave dynamics in surf and swash zone, reduces offshore sediment transport, and induces different morphological features.

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