نتایج جستجو برای: diversifications
تعداد نتایج: 176 فیلتر نتایج به سال:
The complexity and dynamics of microbial metagenomes may be evaluated by genome size, gene duplication and the disruption rate between lineages. In this study, we pyrosequenced the metagenomes of microbes obtained from the brine and sediment of a deep-sea brine pool in the Red Sea to explore the possible genomic adaptations of the microbes in response to environmental changes. The microbes from...
Advances in imaging and modeling facilitate the calculation of biomechanical forces in biological specimens. These factors play a significant role during ontogenetic development of cichlid pharyngeal jaws, a key innovation responsible for one of the most prolific species diversifications in recent times. MicroCT imaging of radiopaque-stained vertebrate embryos were used to accurately capture th...
There have been a number of attempts to explain how crocodylian bite-force performance covaries with cranial form and diet. However, the mechanics and morphologies of crocodylian jaws have thus far remained incongruent with data on their performance and evolution. For example, it is largely assumed that the functional anatomy and performance of adults tightly fits the adult niche. At odds with ...
The Hawaiian Drosophila offer a unique opportunity to examine evolutionary questions because of the known ages of the Hawaiian Islands and the large number of species endemic to this archipelago. One of the more well studied groups of Hawaiian Drosophila is the planitibia species group, a long-standing population genetic model system. Here we present a molecular phylogenetic hypothesis of all 1...
The Chinese banking sector has gone through a consistent process of the reform which includes liberalization of the business to foreign banks, privatization and listing bank shares, allowing diversifications into intermediary business beyond the traditional deposit and loan activities. In the mean time, the changing structures of the banking sector and the favourable economic condition in the r...
During the Early to Middle Miocene the Dinaride mountain chain harbored a series of intramontane lakes, collectively termed the Dinaride Lake System (DLS; Figs 1A–B; Krstić et al. 2003; Harzhauser & Mandic 2008). These tectonically isolated lakes experienced an outstanding endemic evolution of freshwater mollusks. Harzhauser & Mandic (2008, 2010) described the DLS fauna as entity and counted 11...
An improved immune algorithm, named the Taguchi-immune algorithm (TIA), is proposed to solve global numerical optimization problems with continuous variables based on both the features of a biological immune system and the systematic reasoning ability of the Taguchi method. In the TIA, the clonal proliferation within hypermutation for several antibody diversifications and the recombination by u...
Because many survivors of mass extinctions do not participate in postrecovery diversifications, and therefore fall into a pattern that can be termed "Dead Clade Walking" (DCW), the effects of mass extinctions extend beyond the losses observed during the event itself. Analyses at two taxonomic levels provide a first-order test of the prevalence of DCWs by using simple and very conservative opera...
The factors promoting the evolution of parental care strategies have been extensively studied in experiment and theory. However, most attempts to examine parental care in an evolutionary context have evaluated broad taxonomic categories. The explosive and recent diversifications of East African cichlid fishes offer exceptional opportunities to study the evolution of various life history traits ...
Flowers sensu lato are short, specialized axes bearing closely aggregated sporophylls. They are typical for seed plants (spermatophytes) and are prominent in flowering plants sensu stricto (angiosperms), where they often comprise an attractive perianth. There is evidence that spermatophytes evolved from gymnosperm-like plants with a fern-like mode of reproduction called progymnosperms. It seems...
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