Preliminary insights of the genetic diversity and invasion pathways of Cedrela odorata in the Galapagos Islands, Ecuador

Author:

Albuja‐Quintana Martina12ORCID,Rivas‐Torres Gonzalo2345ORCID,Rojas López Karla E.12ORCID,Asadobay Pacarina12,Palacios Cuenca Walter6,Vinueza Génesis12,Torres Maria de Lourdes1234ORCID

Affiliation:

1. Colegio de Ciencias Biológicas y Ambientales, Laboratorio de Biotecnología Vegetal Universidad San Francisco de Quito (USFQ) Quito Ecuador

2. Colegio de Ciencias Biológicas y Ambientales Universidad San Francisco de Quito USFQ Quito Ecuador

3. Galápagos Science Center Universidad San Francisco de Quito San Cristobal Ecuador

4. University of North Carolina at Chapel Hill Chapel Hill North Carolina USA

5. Estación de Biodiversidad Tiputini, Colegio de Ciencias Biológicas y Ambientales Universidad San Francisco de Quito USFQ Quito Ecuador

6. Herbario Nacional del Ecuador (QCNE)‐Instituto Nacional de Biodiversidad Quito Ecuador

Abstract

AbstractCedrela odorata is considered the second most invasive tree species of the Galapagos Islands. Although it is listed in CITES Appendix II and there are population losses in mainland Ecuador, in Galapagos it is paradoxically a species of concern due to its invasive potential. Genetic studies can shed light on the invasion history of introduced species causing effects on unique ecosystems like the Galapagos. We analyzed nine microsatellite markers in C. odorata individuals from Galapagos and mainland Ecuador to describe the genetic diversity and population structure of C. odorata in the Galapagos and to explore the origin and invasion history of this species. The genetic diversity found for C. odorata in Galapagos (He = 0.55) was lower than reported in the mainland (He = 0.81), but higher than other invasive insular plant species, which could indicate multiple introductions. Our results suggest that Ecuador's northern Coastal region is the most likely origin of the Galapagos C. odorata, although further genomic studies, like Whole Genome Sequencing, Rad‐Seq, and/or Whole Genome SNP analyses, are needed to confirm this finding. Moreover, according to our proposed pathway scenarios, C. odorata was first introduced to San Cristobal and/or Santa Cruz from mainland Ecuador. After these initial introductions, C. odorata appears to have arrived to Isabela and Floreana from either San Cristobal or Santa Cruz. Here, we report the first genetic study of C. odorata in the Galapagos and the first attempt to unravel the invasion history of this species. The information obtained in this research could support management and control strategies to lessen the impact that C. odorata has on the islands' local flora and fauna.

Funder

Galapagos Science Center

Publisher

Wiley

Reference86 articles.

1. Asadobay P.(2019).Diversidad y conectividad genética del cedro(Cedrela odorata Meliaceae)en Ecuador continental. Dissertation Universidad San Francisco de Quito.

2. Offspring Recruitment around Tropical Trees: Changes in Cohort Distance with Time

3. Phenotypic and genetic differentiation between native and introduced plant populations

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