Abstract
Lamellibrachia vestimentiferan tubeworms form aggregations at hydrocarbon cold seeps in the deep Gulf of Mexico (GoM), creating structures that provide living space for other fauna. In the GoM, three Lamellibrachia taxa vary in morphology and depth ranges: Lamellibrachia luymesi (300–950 m), Lamellibrachia sp. 1 (950–2,604 m), and Lamellibrachia sp. 2 (1,175–3,304 m). While Lamellibrachia sp. 2 is consistently identified as a separate species, L. luymesi and sp. 1 cannot be discriminated using barcoding markers cytochrome oxidase subunit 1 (COI) and large ribosomal subunit rDNA (16S). To determine if limited gene flow was a factor in the formation of these taxa, we employed more quickly evolving markers, including mitochondrial cytochrome B (CYTB), hemoglobin subunit B2 intron (HbB2i), and six polymorphic microsatellites; microsatellites were amplified across 45 L. luymesi and sp. 1 individuals. Additionally, we used microsatellites to ask whether populations of Lamellibrachia sp. 1 and sp. 2 show evidence of significant structure. Despite a lack of resolution seen with CYTB and HbB2i, L. luymesi and sp. 1 form genetically differentiated clusters at the cross-amplified microsatellites. Furthermore, we find no evidence for population structure for either Lamellibrachia sp. 1 or sp. 2 across the GoM.
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We would like to thank the following people for their contribution to this project: captains, crews, and expedition leaders of the DSV Johnson Sea Link II, R/V Seward Johnson ROV Jason II, the US deep submergence facility, DSV Alvin, R/V Atlantis, the NOAA vessel Ronald Brown; Drew Wham, Sophie Arnaud-Haond, Kevin Kocot, Kimberlyn Nelson, Iliana Baums, Todd LaJeunesse, Chuyna Huang, Pen-Yuan Hsing, Miles Saunders, Andrew Mendelson, and Olivier Soubigou. This research was funded in part by the National Science Foundation (Award # 1209688 and IOS-0843473 to DAC and KMH), the National Oceanographic Partnership Program (NOPP) through support from the Bureau of Ocean Energy Management contracts #M05PC00018 and #M08PC20038 to CRF (TDI Brooks International Prime), the National Oceanic and Atmospheric Administration’s Office of Ocean Exploration and Research (NOAA OER), the Penn State Eberly College of Science, and an Alfred P. Sloan Scholarship to DAC. Any opinions, findings, conclusions, or recommendations expressed in this article are those of the authors and do not necessarily reflect the views of the National Science Foundation.
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Cowart, D.A., Halanych, K.M., Schaeffer, S.W. et al. Depth-dependent gene flow in Gulf of Mexico cold seep Lamellibrachia tubeworms (Annelida, Siboglinidae). Hydrobiologia 736, 139–154 (2014). https://doi.org/10.1007/s10750-014-1900-y
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DOI: https://doi.org/10.1007/s10750-014-1900-y