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The Evidence for Evolution

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.

Trophic Levels

Trophic Levels

All organisms in an ecosystem occupy a trophic level in the food chain. The lowest level consists of primary producers, which synthesize their food from either solar or chemical energy. Each subsequent level obtains energy from the levels below. Detritivores can occupy any of the levels above primary producers.

Trophic Efficiency

Trophic Efficiency

Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.

Convergent Evolution

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.

Eukaryotic Evolution

Eukaryotic Evolution

The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...

Synteny and Evolution

Synteny and Evolution

John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...

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Related Experiment Video

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Author Spotlight: Targeted Microinjection and Electroporation of Primate Cerebral Organoids for Genetic Modification

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Macroevolutionary effects on primate trophic evolution and their implications for reconstructing primate origins.

Jeremiah E Scott¹

¹Department of Medical Anatomical Sciences, College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, 309 E. Second St. Pomona, California, 91766-1854, USA.

Journal of Human Evolution

|July 31, 2019

Summary

The visual-predation hypothesis suggests primates evolved from insect-eating ancestors. This study finds insectivorous primate lineages diversify slower, explaining why insectivory is rare today, not disproving the hypothesis.

Keywords:

Activity pattern Angiosperm coevolution Body size Diet Diversification Visual predation

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Published on: January 7, 2019

Area of Science:

Primate evolutionary biology
Macroevolutionary dynamics
Trophic ecology

Background:

The visual-predation hypothesis posits insectivorous ancestry for primates.
Critics argue low extant insectivory rates challenge this, suggesting herbivory is the conserved pattern.
Insectivory's rarity is often seen as a deviation from primate herbivory.

Purpose of the Study:

To test hypotheses explaining the low frequency of insectivory in extant primates.
To investigate whether trophic evolution was biased or if insectivorous lineages diversify at different rates.
To assess the role of activity patterns and ecological factors in shaping primate trophic strategies.

Main Methods:

Model-based analysis of trait data from 307 extant primate species.
Comparison of transition rates between insectivory and herbivory.
Evaluation of diversification rates between insectivorous and herbivorous lineages, considering activity patterns.

Main Results:

Rates of transition into and out of insectivory are similar, refuting biased trophic evolution.
Insectivorous primate lineages exhibit significantly lower diversification rates than herbivorous ones.
Nocturnality mediates lower diversification in insectivorous lineages; large body size and diurnality also limit insectivory.

Conclusions:

Macroevolutionary processes favor herbivory's proliferation and persistence over insectivory.
The low frequency of insectivory is explained by asymmetric diversification, not necessarily by it being an apomorphic trait.
Findings support the possibility of an insectivorous ancestry for primates, aligning with the visual-predation hypothesis.