The only reason for the creation of new species that I found from the internet is geographical isolation. Are there any more reasons?
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A paper from Müller et al. proposes a molecular marker called a CBC, differences in which can be used to call two different species, even when closely related: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1950759/
In this study we are looking for a molecular classifier that might indicate that two organisms belong to different species. We are interested in an indicator hypothesis that is easy to work upon and additionally yields a certain probability that two organisms belong to distinct species. Compensatory base changes (CBCs) in the internal transcribed spacer 2 region (ITS2) of the nuclear rRNA cistron have been suggested as such a classifier.
Some mutation event that creates sufficiently different CBCs in a viable offspring capable of further reproduction, i.e., survives natural selection, would therefore lead to speciation, by this measure.
answered Feb 28, 2020 at 1:38
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$\begingroup$ So, natural selection is another type of speciation. I understand. $\endgroup$ Feb 28, 2020 at 2:34
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$\begingroup$ Natural selection acts on organisms. Some organisms have deleterious mutations. Some have neutral mutations. Some have (more rarely) beneficial mutations. If mutants survive or thrive and (most importantly) reproduce, and if they carry sufficient and specific genetic changes, then those mutants could lead to what this method would term a new species. $\endgroup$ Feb 28, 2020 at 3:22
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1$\begingroup$ This seems like a very specific answer to a very general question... I see it's been accepted but I'm worried that it's a bit misleading. $\endgroup$– Bryan Krause ♦Feb 28, 2020 at 5:57
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$\begingroup$ If it is misleading, you're welcome to provide another answer. $\endgroup$ Feb 28, 2020 at 7:50
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$\begingroup$ Drive-by downvoting is of no help to improving Stack Exchange, nor this subsite, generally. Clean up your act. $\endgroup$ Mar 1, 2020 at 5:40