نتایج جستجو برای: heteromorphic taxon
تعداد نتایج: 11345 فیلتر نتایج به سال:
Abstract Gazania (L.) is one of wild ornamental plant which has special architectures. It a small genus 16 species, belonging to the family Asteraceae (Formerly: Compositae). low-growing perennial herb, grow in clumps and can also form dense carpets covering large areas. multiple genera species with mutli-petals colors. The chlorophyll pigmentation was measured leaves petals these specimens sho...
Appropriate and extensive taxon sampling is one of the most important determinants of accurate phylogenetic estimation. In addition, accuracy of inferences about evolutionary processes obtained from phylogenetic analyses is improved significantly by thorough taxon sampling efforts. Many recent efforts to improve phylogenetic estimates have focused instead on increasing sequence length or the nu...
Disarticulated and incomplete remains from a new diminutive ornithopod are described. They come from the Cameros Basin in the north of Spain and were collected from the red clays of the Castrillo de la Reina Formation, ranging from Upper Barremian to Lower Aptian. The new ornithopod described here is slender and one of the smallest ever reported. An up-to-date phylogenetic analysis recovers thi...
Species richness is the most commonly used but controversial biodiversity metric in studies on aspects of community stability such as structural composition or productivity. The apparent ambiguity of theoretical and experimental findings may in part be due to experimental shortcomings and/or heterogeneity of scales and methods in earlier studies. This has led to an urgent call for improved and ...
Crocodyliforms were one of the most successful groups of Mesozoic tetrapods, radiating into terrestrial, semiaquatic and marine environments, while occupying numerous trophic niches, including carnivorous, insectivorous, herbivorous, and piscivorous species. Among these taxa were the enigmatic, poorly represented flat-headed crocodyliforms from the late Cretaceous of northern Africa. Here we re...
The effect of taxonomic sampling on phylogenetic accuracy under parsimony is examined by simulating nucleotide sequence evolution. Random error is minimized by using very large numbers of simulated characters. This allows estimation of the consistency behavior of parsimony, even for trees with up to 100 taxa. Data were simulated on 8 distinct 100-taxon model trees and analyzed as stratified sub...
Zephyranthes citrina is an ornamental American bulbous plant used as garden crop for the aesthetic qualities of its yellow perigonium. The objective this work was to characterize species by classical chromosome staining and fluorochrome banding. A sporophytic number 2n=8x=48 chromosomes observed, being karyotypic formula 20 m + 26 sm 2 st. Satellites were detected in short arm metacentric 8, 9,...
Under the background of digitization, basic algorithm minimal surface provides novel and rich creative themes for architectural design. However, due to high complexity extreme thinness, how convert mathematical model mechanical has become biggest challenge in application large-size surface. On basis analysing relation between force form, this paper explores verifies concept method transforming ...
Pyropia has a unique heteromorphic life cycle with alternation stages between thallus and conchocelis, which lives at different water temperatures in different seasons. To better understand the different adaptation strategies for temperature stress, we tried to observe comparative biochemical changes of Pyropia haitanensis based on a short term heat shock model. The results showed that: (1) At ...
The production of morphologically different seeds or fruits by the same individual plant is known as seed heteromorphism. Such variation is expected to be selected for in disturbance-prone environments to allow germination into inherently variable regeneration niches. However, there are few demonstrations that heteromorphic seed characteristics should be favored by selection or how they may be ...
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