Speciation & Hybridization Seminar

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Spring 2009. EEB 5894- section 001, Instructor Chris Simon, Peoplesoft class number (12379)

Contents

Meeting time and place

We are meeting this semester in the Biopharm 3rd Floor Fishbowl Mondays and Tuesdays 2-3pm.

Please sign up for two dates on the schedule below. A list of topic ideas follows but you can choose anything related to speciation and hybridization.

Subtopic Ideas:

SPECIATION 1) What did Darwin say about speciation and hybridization? (First week) 2) When does a species become a species? How can the earliest stages of speciation be recognized? 3) How much genetic divergence should we expect within species? Are large genetic divergences within species due to polymorphisms/large population sizes, or artifacts, or are they simply due to our failure to recognize cryptic species? 4) Are there "speciation genes"? What are some examples? Are speciation genes restricted to a certain type of mutation or class of genes?

HYBRIDIZATION: It has been estimated that at least 25% of plant species and 10% animal species hybridize* 1) How much gene flow occurs across species boundaries and what are the consequences for species? 2) How can lineage sorting be separated from hybridization as a cause for phylogenetic uncertainty? 3) How important is hybrid speciation in nature 4) Conservation Biology: Should hybrids be shot or poisoned? Or not?

  • Mallet, 2005, 2007


Schedule for Spring Semester 2009

Note: the papers linked here require a user name and password to access. If you have forgotten the user name and/or password, contact Chris Simon. If you want to upload a PDF file for an upcoming discussion, use the PDF upload form. Uploading PDFs requires the same user name and password as viewing PDFs.

Monday, March 16th, 2009: Geographic Variants, Incipient Species, Species: Where to Draw the Line?

Discussion leader: Chris Simon

"On the Origin of Species...", Chapter II. Variation Under Nature

The text can be found in searchable form on line at... http://darwin-online.org.uk/ click on the sixth edition of The Origin of Species...

Tuesday, March 17th, 2009: Hydridization Between Recognized Species Was Well Documented in Darwin's Time

Discussion leader: Chris Simon

"On the Origin of Species...", Chapter IX. Hybridism

The text can be found in searchable form on line at... http://darwin-online.org.uk/ click on the sixth edition of The Origin of Species...

Monday, March 23rd, 2009: Speciation with Gene Flow in Cave Salamanders: Coalescent Models, Adaptive Shifts & Parapatric Speciation

Discussion leader: LeRoy Robinson

Pdficon small.gifNiemiller et al. 2008 Mol Ecol.pdf
Pdficon small.gifNosil 08 speciation with gene flow.pdf

Tuesday, March 24th, 2009: Does Gene Flow Constrain Adaptation or Vice Versa (Ecological Speciation)

Discussion leader: LeRoy Robinson

Pdficon small.gifNosil, Patrik. 2009. Cryptic color patterning Evol.pdf

Monday, March 30st, 2009: Conclusive Evidence for Sympatric Speciation in Central American Lake Cichlids (or not)?

Discussion leader: Geert Goemans

Pdficon small.gifBarluenga et al.,2006 sympatric.pdf

and the reply ... and as dessert the reply to the reply

Pdficon small.gifreply to Barluenga et al., 2006.pdf

Tuesday, March 31st, 2009: Mixed Yule Coalescents, Very Low Gene Flow, mtDNA Substructuring & Speciation

Discussion leader: Chris Owen

Pdficon small.gifPhilTransRSocB Papadopoulou et al. 2008.pdf

Monday, April 6th, 2009: Can reproductive Isolation Evolve on Ecological Time Scales?

Discussion leader: Geert Goemans

Pdficon small.gifHendry et al., 2007 speed of speciation.pdf

Tuesday, April 7th, 2009: How should we classify speciation?

Discussion leader: Chris Owen

Pdficon small.gifButlin et al. 2008PhilTrans.pdf

Monday April 13th

Discussion leader: Roberta Engel
PDFs WILL BE POSTED SHORTLY

Topic: This week we'll take a look at speciation and hybridization in the land snail Cerion. Monday's reading will focus on speciation in this system that Mayr and Rosen (1956) noted as having a "crazy quilt" pattern of distribution.

1. Geographic differentiation and speciation in Cerion –a preliminary discussion of patterns and processes DS Woodruff, SJ Gould Biological Journal of the Linnean Society 14 (3-4), 1980, pp. 389 - 416

Tuesday April 14th

Discussion leader: Roberta Engel

Topic: Today we will discuss two papers that examine hybridization in Cerion.

1. Fifty years of interspecific hybridization: genetics and morphometrics of a controlled experiment on the land snail Cerion in the Florida Keys DS Woodruff, SJ Gould – Evolution 41(5), 1987, pp.1022-1045

2. Paleontology and Chronology of Two Evolutionary Transitions by Hybridization in the Bahamian Land Snail Cerion Glenn A. Goodfriend and Stephen Jay Gould Science 13 December 1996:
 274 (5294), pp. 1894 - 1897

Monday, April 20th, 2009:

Discussion leader: Beth Wade

Topic: Distinguishing Hybridization from Lineage Sorting

Tuesday, April 21st, 2009:

Discussion leader: Thiago Rangel

Topic: TBA

Monday, April 27th, 2009:

Discussion leader: Beth Wade

Topic: How much gene flow occurs across species boundaries

Tuesday, April 28th, 2009:

Discussion leader: Thiago Rangel

Topic: TBA End of semester

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