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Marine Ecology Progress Series

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MEPS 532:153-159 (2015)  -  DOI:

Lack of adult novel northern lineages of invasive green crab Carcinus maenas along much of the northern US Atlantic coast

Larissa M. Williams1,2,*, Camilla L. Nivison1, William G. Ambrose Jr.1,3, Rebecca Dobbin1, William L. Locke V1

1Department of Biology, Bates College, Lewiston, ME 04240, USA
2The Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04609, USA
3Akvaplan-niva, FRAM - High North Research Centre for Climate and the Environment, 9296 Tromsø, Norway
*Corresponding author:

ABSTRACT: Introduced over 200 yr ago to the east coast of North America, Carcinus maenas now ranges from New York to Newfoundland. In the 1980s, a secondary invasion of European lineages, termed northern haplotypes, occurred in Nova Scotia. Young-of-the-year sampled in 2007 revealed that northern haplotypes were present in low frequencies at several northwestern Atlantic sites as far south as New York; a model predicted an increase in their range and frequency over time. We collected samples in 2013 and 2014 to determine the haplotypes of adult crabs from New York to Nova Scotia. Six haplotypes, encompassing previously identified northern and southern haplotypes, 1 novel southern haplotype, and 1 Scandinavian haplotype, were identified in 275 crabs sampled at 11 sites. Northern haplotypes were only found in Nova Scotia, Beals Island (Maine), and Mount Desert Island (Maine) at a frequency of 60, 8, and 24%, respectively; remaining sites were predominantly composed of a previously identified southern haplotype. Northern haplotypes are limited in adult crabs to Mount Desert Island and north, indicating that the southern haplotype is selectively favored at some point during their life history, recruitment of northern larvae is limited south of Mount Desert Island, or entire year-classes post-2007 were lost. Our results do not support the predictions of an increase in the range and frequency of northern haplotypes, at least among adults, and indicate that a more complete knowledge of factors affecting C. maenas life stages is necessary to understand the current distribution of haplotypes.

KEY WORDS: Carcinus maenas · Population genetics · Mitochondrial DNA · Invasive species · Range

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Cite this article as: Williams LM, Nivison CL, Ambrose WG Jr, Dobbin R, Locke WL V (2015) Lack of adult novel northern lineages of invasive green crab Carcinus maenas along much of the northern US Atlantic coast. Mar Ecol Prog Ser 532:153-159.

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