[Faculty] Fwd: [CSRC.COLLOQUIUM] "Modeling the Speciation Process in Species Delimitation "

[Jose Castillo]

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DATE:
*Friday, January 22, 2021*


TITLE:

 *Modeling the Speciation Process in Species Delimitation*

TIME:
*3:30-4:30PM*



LOCATION:
Join Zoom Meeting -   https://SDSU.zoom.us/j/89711086437


SPEAKER/BIO:

*Dr. Jeet Sukumaran, Biology, San Diego State University*


ABSTRACT:
The "multispecies" coalescent (MSC) model that underlies many genomic
species-delimitation approaches is problematic because it does not
distinguish between genetic structure associated with species versus that
of populations within species. Consequently, as both the genomic and
spatial resolution of data increases, a proliferation of artifactual
species results as within-species population lineages, detected due to
restrictions in gene flow, are identified as distinct species. The toll of
this extends beyond systematic studies, getting magnified across the many
disciplines that rely upon an accurate framework of identified species.
Here we present the first of a new class of approaches that addresses this
issue by incorporating an extended speciation process for species
delimitation. We model the formation of population lineages and their
subsequent development into independent species as separate processes and
provide for a way to incorporate current understanding of the species
boundaries in the system through specification of species identities of a
subset of population lineages. As a result, species boundaries and
within-species lineages boundaries can be discriminated across the entire
system, and species identities can be assigned to the remaining lineages of
unknown affinities with quantified probabilities.% In addition to the
identification of species units in nature, the primary goal of species
delimitation, the incorporation of a speciation model also allows us
insights into the links between population and species-level processes. By
explicitly accounting for restrictions in gene flow not only between, but
also within, species, we also address the limits of genetic data for
delimiting species. Specifically, while genetic data alone is not
sufficient for accurate delimitation, when considered in conjunction with
other information we are able to not only learn about species boundaries,
but also about the tempo of the speciation process itself.


Host: Jose Castillo

Note: Videos of previous colloquium talks can be seen on the CSRC website
in the colloquium archive section or on the CSRC YouTube page here
<https://www.youtube.com/channel/UCN0ZEztlmyDqG2pm-Rle_Eg/feed>.




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