Genetic identification of source and likely vector of a widespread marine invader.

Krueger-Hadfield, Stacy A., Kollars, Nicole M., Strand, Allan E., Byers, James E., Shainker, Sarah J., Terada, Ryuta, Greig, Thomas W., Hammann, Mareike, Murray, David C., Weinberger, Florian and Sotka, Erik E. (2017) Genetic identification of source and likely vector of a widespread marine invader. Open Access Ecology and Evolution, 7 (12). pp. 4432-4447. DOI 10.1002/ece3.3001.

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Abstract

The identification of native sources and vectors of introduced species informs their ecological and evolutionary history and may guide policies that seek to prevent future introductions. Population genetics provides a powerful set of tools to identify origins and vectors. However, these tools can mislead when the native range is poorly sampled or few molecular markers are used. Here, we traced the introduction of the Asian seaweed Gracilaria vermiculophylla (Rhodophyta) into estuaries in coastal western North America, the eastern United States, Europe, and northwestern Africa by genotyping more than 2,500 thalli from 37 native and 53 non-native sites at mitochondrial cox1 and 10 nuclear microsatellite loci. Overall, greater than 90% of introduced thalli had a genetic signature similar to thalli sampled from the coastline of northeastern Japan, strongly indicating this region served as the principal source of the invasion. Notably, northeastern Japan exported the vast majority of the oyster Crassostrea gigas during the 20th century. The preponderance of evidence suggests G. vermiculophylla may have been inadvertently introduced with C. gigas shipments and that northeastern Japan is a common source region for estuarine invaders. Each invaded coastline reflected a complex mix of direct introductions from Japan and secondary introductions from other invaded coastlines. The spread of G. vermiculophylla along each coastline was likely facilitated by aquaculture, fishing, and boating activities. Our ability to document a source region was enabled by a robust sampling of locations and loci that previous studies lacked and strong phylogeographic structure along native coastlines.

Document Type: Article
Additional Information: Data Accessibility: Microsatellite primer sequences were deposited in GENBANK, accession numbers KT232089–KT232097 and KT232099. Ploidy designation for each thallus, GenAlEx files (diploid total, haploid total, diploid Psex), cox1 haplotypes, cox1 sequences for the thalli from this study, and the cox1 SNP for each thallus were deposited in DRYAD, entry https://doi.org/10.5061/dryad.fn53k. Mitochondrial haplotypes were deposited in GENBANK (Acc. No. KY621338-KY6211343).
Keywords: algae, biological invasion, Northwest Pacific, oysters, phylogeography, population genetics
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1002/ece3.3001
ISSN: 2045-7758
Related URLs:
Date Deposited: 12 May 2017 10:48
Last Modified: 01 Feb 2019 15:07
URI: http://oceanrep.geomar.de/id/eprint/37969

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