Historical invasions of the intertidal zone of Atlantic North America associated with distinctive patterns of trade and emigration

Brawley, Susan H.; Coyer, James A.; Blakeslee, April M. H.; Hoarau, Galice; Johnson, Ladd E.; Byers, James E.; Stam, Wytze T.; Olsen, Jeanine L.

doi:10.1073/pnas.0812300106

Cited by 77 publications

(77 citation statements)

References 32 publications

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“…The population may represent an accumulation of various genotypes that evolved in more northerly locations and moved south with the prevailing current in the Gulf of Maine. Further studies using controlled seasonal collections on more southern populations would be necessary to test this theory, however, as other modes of transport across the Atlantic were possible (Brawley et al 2009). …”

Section: New Hampshire Lineagesmentioning

confidence: 99%

Genetic variation within and among asexual populations of Porphyra umbilicalis Kützing (Bangiales, Rhodophyta) in the Gulf of Maine, USA

Eriksen¹,

Green²,

Klein

2016

Botanica Marina

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Abstract:The intertidal marine red alga Porphyra umbilicalis reproduces asexually in the Northwest Atlantic. We looked for population substructure among typical opencoastal and atypical estuarine habitats in seven asexual populations of P. umbilicalis from Maine to New Hampshire using eight expressed sequence tag-simple sequence repeats (EST-SSR) or microsatellite loci. Six genotypes were identified, four of which may represent recombinant genotypes from a recombination event that took place locally, or that took place prior to introduction to the Northwest Atlantic. Genotypic diversity was lowest in a population from Wiscasset, Maine, which inhabits an atypical habitat high in the intertidal zone of a bridge piling in an estuarine tidal rapid. Genotypic diversity was highest in the southernmost populations from New Hampshire; we identified two genotypes that were unique to the southernmost populations, and probably represent the most derived genotypes. We looked at genetic distances among populations in similar habitats, and found that populations were more closely related to their closest neighboring population than to a population in a similar habitat. We show that genotypic diversity within P. umbilicalis populations in the Gulf of Maine is relatively high and thus fits a model of high steady-state variation within asexual populations.

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Section: New Hampshire Lineagesmentioning

confidence: 99%

Genetic variation within and among asexual populations of Porphyra umbilicalis Kützing (Bangiales, Rhodophyta) in the Gulf of Maine, USA

Eriksen¹,

Green²,

Klein

2016

Botanica Marina

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“…This difference between the snail hosts could be because of major distinctions between their invasion pathways. In particular, L. littorea's introduction vector (purportedly rock ballast in ships; Brawley et al, 2009) probably did not allow for as much gene flow between source and founding populations as did I. obsoleta's introduction vector due to longer transit times and harsher transfer conditions for L. littorea versus I. obsoleta. Even still, we found parasites of both snails to exhibit more apparent founder effect signatures than their snail hosts.…”

Section: Resultsmentioning

confidence: 99%

Aquatic Introductions and Genetic Founder Effects: How do Parasites Compare to Hosts?

Blakeslee¹,

Fowler²

2012

Analysis of Genetic Variation in Animals

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“…5.1) as the minimal sum of 4-5-km straight-line segments traced along the coast without intersecting land and then divided this distance by the time between successive surveys or observations. Because this technique followed the general contours of the coastline (treating nearshore islands within 2-3 km of the mainland as part of the mainland), the rates we report here should be faster than those calculated previously for this invasion (Brawley, et al 2009;Lyons and Scheibling 2009), which were based on the shortest distances across open water (i.e., skipping coastal features such as embayments). Whereas such estimates are appropriate for questions of very local dispersal (Brawley et al 2009) or global comparisons (Lyons and Scheibling 2009), our protocol better represents the natural spread of species at regional scales.…”

Section: Rates Of Range Expansionmentioning

confidence: 95%

“…Here we examine the invasion of the European rockweed Fucus serratus L. (Fucaceae, Phaeophyceae, Heterokontophyta) in the western North Atlantic since its introduction from Great Britain and Ireland over 140 years ago (Brawley et al 2009). This invasion of the coastal habitats of eastern Canada was first detected in Pictou Harbour (Nova Scotia) in the late 1860s (Hay and MacKay 1887).…”

Section: Introductionmentioning

confidence: 99%

Secondary spread of invasive species: historic patterns and underlying mechanisms of the continuing invasion of the European rockweed Fucus serratus in eastern North America

2011

Self Cite

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Post-establishment spread of invasive species is a major determinant of their impact, but the spatial pattern and temporal rhythm of secondary spread are often poorly known or understood. Here we examine the spread of the European rockweed Fucus serratus over 1,500 km of shoreline after its initial discovery in Pictou, Nova Scotia (Canada) in 1868. Building upon earlier periodic surveys, we document the current distribution of this invader and provide a historic analysis of the invasion, including the integration of the recently-detected multiple introductions from Europe. The initial spread was rapid in the southern Gulf of St. Lawrence (6.0 km year -1 ), likely due to both natural spread in a favorable environment and the extensive regional shipping traffic at the time which linked Pictou to several key ports in eastern Canada and northeast USA. Later spread, especially along the Atlantic coast of Nova Scotia, was slower (recently 0.9 km year -1 ), but included several major jumps (*50-500 km), undoubtedly due to human-mediated transport. Although the spatial extent of the invasion has increased over the past 140 years, it has experienced several remarkable events: apparent local extinctions of northern satellite populations, a major retraction (100-150 km) along the northwestern limits of its continuous range, and stalled invasions at several points and times during its southward progression. Distributional data suggest that this invader is excluding congeners in shallow zones and possibly kelp species in deeper zones. Genetic data from one contact zone showed hybridization with native F. distichus but no evidence for introgression in migrating F. serratus. Hybridization and several other reproductive traits likely contribute to the competitive dominance of the invader in this environment.

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Historical invasions of the intertidal zone of Atlantic North America associated with distinctive patterns of trade and emigration

Cited by 77 publications

References 32 publications

Genetic variation within and among asexual populations of Porphyra umbilicalis Kützing (Bangiales, Rhodophyta) in the Gulf of Maine, USA

Genetic variation within and among asexual populations of Porphyra umbilicalis Kützing (Bangiales, Rhodophyta) in the Gulf of Maine, USA

Aquatic Introductions and Genetic Founder Effects: How do Parasites Compare to Hosts?

Secondary spread of invasive species: historic patterns and underlying mechanisms of the continuing invasion of the European rockweed Fucus serratus in eastern North America

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