Evolution of Shape in Diatoms
نویسندگان
چکیده
The evolution of shape in centric diatoms is investigated by probabilistic means on phylogenetic data using the Bayes Traits software, developed by Mark Pagel. Preliminary results of this method are presented showing transitional rates between one trait group to another, the results suggest that diatom valve outlines with higher degrees of symmetry are evolutionary more unstable. Weaknesses of the method used, how it can be improved and other future possible approaches are then discussed.
منابع مشابه
The Evolution of Elongate Shape in Diatoms
Diatoms have been classified historically as either centric or pennate based on a number of features, cell outline foremost among them. The consensus among nearly every estimate of the diatom phylogeny is that the traditional pennate diatoms (Pennales) constitute a well-supported clade, whereas centric diatoms do not. The problem with the centric–pennate classification was highlighted by some r...
متن کاملSeasonal variations in the epilithic diatoms of Koçan Falls (Erzincan, Turkey)
The present study explores some physical and chemical parameters in the epilithic diatoms in the water samples obtained from two stations in Koçan Falls, Erzincan from March to November 2014. Over the course of the study, 19 taxa of epilithic diatoms were recorded. Diatom genera which had the highest number of species in the study period were Cymbella (4 species), Navicula (4 species), and Cycl...
متن کاملA Useful Family of Stochastic Processes for Modeling Shape Diffusions
One of the new area of research emerging in the field of statistics is the shape analysis. Shape is defined as all the geometrical information of an object whose location, scale and orientation is not of interest. Diffusion in shape analysis can be studied via either perturbation of the key coordinates identifying the initial object or random evolution of the shape itself. Reviewing the f...
متن کاملEpipsammic diatoms of diatoms of Kelkit Creek (Tokat/Turkey)
In this study, diatoms in epipsammic samples, which were taken from two stations selected in Kelkit Creek (Tokat/Turkey) between March and December 2018, were analyzed. During the study, a total of 25 taxa belonging to diatoms were recorded. The diatom species represented by the highest number of taxa were Cymbela (4 taxa), Nitzschia (4 taxa), and Navicula (3 taxa). Sorensen similarity index be...
متن کاملModeling the evolution of cells outgrowth due to the force exerted by actins
Motility and membrane deformation are crucial to motile cells. Therefore formation of protrusion in the membrane has been the subject of various studies. The stable shape of the membrane and also its movements are controlled by the forces exerted by actin filaments. In order to study the protrusion behavior, we represented a toy model based on actin filaments polar characteristic and elastic ch...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2012