نتایج جستجو برای: taxon
تعداد نتایج: 10995 فیلتر نتایج به سال:
In recent years, tulip flowers have been grown extensively in parks and green spaces of Urmia city (NW Iran). During the surveys in a period from 2014–16, characteristic symptoms of the blue mold rot were observed on both planted and stored tulip bulbs, as the bulbs were covered with a white to bluish-green mycelia and spores. In order to determine the fungi associated with tulip bulbs (Tulipa ...
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...
Analyses and interpretations of the human behavioral significance of frequencies of cut-marked mammal bones have been ongoing for at least 50 years. Many of these studies focus on determining the so-called ‘‘butchering pattern.’’ Few analysts comment on the tremendous range of variation in frequencies and anatomical distributions of cut marks across multiple assemblages of remains of a taxon. S...
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