EPA Science Inventory

Complex genetic patterns in closely related colonizing invasive species

Citation:

Zhan, A., J. Darling, D. Bock, A. Lacoursiere-Roussel, H. MacIsaac, AND M. Cristescu. Complex genetic patterns in closely related colonizing invasive species. Ecology and Evolution. Wiley-Blackwell Publishing, Hoboken, NJ, 2(7):1331-1346, (2012).

Description:

Anthropogenic activities frequently result in both rapidly changing environments and translocation of species from their native ranges (i.e., biological invasions). Empirical studies suggest that many factors associated with these changes can lead to complex genetic patterns, particularly among invasive populations. However, genetic complexities and factors responsible for them remain uncharacterized in many cases. Here, we explore these issues in the vase tunicate Ciona intestinalis (Ascidiacea: Enterogona: Cionidae), a model species complex, of which spA and spB are rapidly spreading worldwide. We intensively sampled 26 sites (N = 873) from both coasts of North America, and performed phylogenetic and population genetics analyses based on one mitochondrial fragment (cytochrome c oxidase subunit 3 –NADH dehydrogenase subunit I, COX3-ND1) and eight nuclear microsatellites. Our analyses revealed extremely complex genetic patterns in both species on both coasts. We detected a contrasting pattern based on the mitochondrial marker: two major genetic groups in C. intestinalis spA on the west coast versus no significant geographic structure in C. intestinalis spB on the east coast. For both species, geographically distant populations often showed high microsatellite-based genetic affinities whereas neighboring ones often did not. In addition, mitochondrial and nuclear markers provided largely inconsistent genetic patterns. Multiple factors, including random genetic drift associated with demographic changes, rapid selection due to strong local adaptation, and varying propensity for human-mediated propagule dispersal could be responsible for the observed genetic complexities.

Purpose/Objective:

To understand colonization history of the invasive marine invertebrate Ciona intestinalis

URLs/Downloads:

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Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Start Date: 04/23/2014
Completion Date: 04/23/2014
Record Last Revised: 05/16/2014
Record Created: 04/23/2014
Record Released: 04/23/2014
OMB Category: Other
Record ID: 273975

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL EXPOSURE RESEARCH LAB

ECOLOGICAL EXPOSURE RESEARCH DIVISION

MOLECULAR ECOLOGY RESEARCH BRANCH