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Evaluating the role of ecological divergence in lineages of marine species after the closure of the Isthmus of Panama: a population genomics approach

The rise and closure of the Isthmus of Panama induced dramatic oceanographic changes at both sides of tropical America with major effects on marine diversity. The Atlantic Ocean turned oligotrophic with an impoverishment of plankton greatly noted with the nearly absence of radiolarians and diatoms, whereas Eastern Pacific (turned into a mesotrophic ocean with cooler waters and localized upwelling. Undoubtedly the major natural evolutionary experiment–that one can have access to–is the closure of the Isthmus of Panama. However, the geological date for the completion of the closure of the Isthmus, which was thought to be around 3.5-2.8 MYA, has been recently under controversy due to new fossil and geological evidence, which evidence suggest it could be older than 10 MYA. The objective of this proposal is to evaluate the effect of ecological divergence during a major allopatric event (the closure of the Isthmus of Panamá). To answer this question, the approach includes multiple lineages of marine organisms, seeking geminate species, and including lineages from diverse trophic levels in rocky littorals, which include grazers, suspension feeders and predators. Using population genomics techniques, the project will extract genetic targeting between 10000 and 40000 SNPs among pairs of geminate species. One of the major advantages of the approach proposed in this proposal is the great availability of fossils from the study systems upon which time-calibrated evolutionary rates can be based on. The expected outcomes from this proposal includes. (1) Differential rates of molecular evolution among different taxa but statistically significant differences among lineages of certain trophic levels. (2) Species from trophic levels facing the most drastic environmental changes after the closure of the Isthmus of Panama (e.g., filter feeding taxa) will show significant outlier loci (Fst) indicating positive selection and adaptive divergence. (3) Despite the differences in molecular evolution rates among SNP loci, it is expected that the combined matrix adjust to a relaxed molecular clock indicating a split older than 10 MYA (alternatively 3.5-2.8 MYA).

Certificado en PDF
Número del certificado16EC7F82174
Fecha del certificado2019-12-02
Certificado en PDFdescargar (57 KB)
Contacto del recurso
NombreJuan Armando Sánchez
PosiciónProfesor titular
OrganizaciónUniversidad de los Andes
Dirección Cra. 1 #18a-12, Bogotá, Cundinamarca, COLOMBIA, Código postal: 111711
Contactojuansanc@uniandes.edu.co Tel: 3394949
Página Webhttp://www.uniandes.edu.co
Contacto del permiso
NombreYiselle Cano
PosiciónAnalista laboratorio
OrganizaciónUniversidad de los Andes
Dirección Cra. 1 #18a-12, Bogotá, Cundinamarca, COLOMBIA, Código postal: 111711
Contactoyp.cano137@uniandes.edu.co Tel: 3394949
Página Webhttp://www.uniandes.edu.co
Proveedor de los metadatos
NombreJuan Armando Sánchez
PosiciónProfesor titular
OrganizaciónUniversidad de los Andes
Dirección Cra. 1 #18a-12, Bogotá, Cundinamarca, COLOMBIA, Código postal: 111711
Contactojuansanc@uniandes.edu.co Tel: 3394949
Página Webhttp://www.uniandes.edu.co
Información del Permiso
Autoridad ambientalAutoridad Nacional de Licencias Ambientales
Número del permisoIDB0359
Titular del permisoUniversidad de los Andes
Nit o cédula860.007.386-1
Fecha de emisión2014-10-09
Cobertura Geográfica
DescripciónColombia CO Archipiélago de San Andrés, Providencia y Santa Catalina San Andres San Andres West View
Coordenadas12.519, 12.519 / -81.03, -81.03 (Latitud mínima, máxima / Longitud mínima/máxima)
Cobertura Taxonómica
Descripción Corales identificados a género y especie
Género Eunicea
Especie Muricea laxa, Muricea muricata, Eunicea knighti, Eunicea asperula, Eunicea succinea, Eunicea clavigera, Eunicea laciniata, Eunicea calyculata, Eunicea tayrona, Eunicea flexuosa, Eunicea fusca, Eunicea mammosa, Eunicea palmeri, Eunicea tourneforti, Eunicea tayrona
Cobertura Temporal
Fecha inicial0035-07-12
Métodos de Muestreo
Descripción del muestreoMediante buceo autonomo se realizan buceos entre 5 y 40m de pronfundidad. Se toman muestras de tejido de cnidarios para posteriormente fijarlos en DMSO y realizar extracción de ADN del organismo y la comunidad asociada.
Palabras Clave
Ecological divergence Coral reef Isthmus of Panama Genomics Colombia Specimen; Specimen