Results 31 to 40 of about 301,309 (281)

Ability of Current Phylogenetic Clustering to Detect Speciation History

open access: yesFrontiers in Ecology and Evolution, 2021
Phylogenetic diversity aims to quantify the evolutionary relatedness among the species comprising a community, using the phylogenetic tree as the metric of the evolutionary relationships.
Athanasios S. Kallimanis   +4 more
doaj   +1 more source

Prolonging the past counteracts the pull of the present: protracted speciation can explain observed slowdowns in diversification. [PDF]

open access: yes, 2012
Phylogenetic trees show a remarkable slowdown in the increase of number of lineages towards the present, a phenomenon which cannot be explained by the standard birth-death model of diversification with constant speciation and extinction rates.
Etienne, RS, Rosindell, J
core   +4 more sources

Mapping Chemical Elements and Iron Oxidation States in the Substantia Nigra of 6-Hydroxydopamine Lesioned Rats Using Correlative Immunohistochemistry With Proton and Synchrotron Micro-Analysis

open access: yesFrontiers in Neuroscience, 2019
Brain metal homeostasis is altered in neurodegenerative diseases and the concentration, the localization and/or the chemical speciation of the elements can be modified compared to healthy individuals.
Asuncion Carmona   +13 more
doaj   +1 more source

Frequency-dependent selection predicts patterns of radiations and biodiversity. [PDF]

open access: yesPLoS Computational Biology, 2010
Most empirical studies support a decline in speciation rates through time, although evidence for constant speciation rates also exists. Declining rates have been explained by invoking pre-existing niches, whereas constant rates have been attributed to ...
Carlos J Melián   +4 more
doaj   +1 more source

The fossilized birth-death model for the analysis of stratigraphic range data under different speciation concepts [PDF]

open access: yes, 2018
A birth-death-sampling model gives rise to phylogenetic trees with samples from the past and the present. Interpreting "birth" as branching speciation, "death" as extinction, and "sampling" as fossil preservation and recovery, this model -- also referred
Drummond, Alexei   +5 more
core   +4 more sources

Solid state differentiation of plasma thiols using a centrifugally activated mercaptobenzothiazole disulfide exchange indicator [PDF]

open access: yes, 2006
The solid state interaction of mono and macromolecular thiols at a disulphide heterocycle is shown to provide a versatile pathway for their ...
Callum Livingstone   +18 more
core   +1 more source

Concentrations of Essential Trace Metals in the Brain of Animal Species—A Comparative Study

open access: yesBrain Sciences, 2020
The essential trace metals iron, zinc, and copper have a significant physiological role in healthy brain development and function. Especially zinc is important for neurogenesis, synaptogenesis, synaptic transmission and plasticity, and neurite outgrowth.
Chiara Alessia DeBenedictis   +5 more
doaj   +1 more source

Divergent preference functions generate directional selection in a jumping spider

open access: yesScientific Reports, 2023
Sexual selection has long been thought to promote speciation, but this possibility still remains a topic of controversy. Many theoretical models have been developed to understand the relationship between sexual selection and speciation, but such ...
Leonardo Braga Castilho
doaj   +1 more source

Reproductive isolation between two populations of Aglaoctenus lagotis , a funnel-web wolf spider [PDF]

open access: yes, 2015
Aglaoctenus lagotis (Lycosidae: Sosippinae) is a spider that, in contrast to the predominant wandering habit of the family, constructs funnel webs.
Aisenberg   +86 more
core   +1 more source

Secondary sympatry caused by range expansion informs on the dynamics of microendemism in a biodiversity hotspot. [PDF]

open access: yesPLoS ONE, 2012
Islands are bounded areas where high endemism is explained either by allopatric speciation through the fragmentation of the limited amount of space available, or by sympatric speciation and accumulation of daughter species.
Romain Nattier   +6 more
doaj   +1 more source

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