title: Comparative population structure of two deep-sea hydrothermal-vent-associated decapods (Chorocaris sp. 2 and Munidopsis lauensis) from southwestern Pacific back-arc basins.
abstract: Studies of genetic connectivity and population structure in deep-sea chemosynthetic ecosystems often focus on endosymbiont-hosting species that are directly dependent on chemical energy extracted from vent effluent for survival. Relatively little attention has been paid to vent-associated species that are not exclusively dependent on chemosynthetic ecosystems. Here we assess connectivity and population structure of two vent-associated invertebrates--the shrimp Chorocaris sp. 2 and the squat lobster Munidopsis lauensis--that are common at deep-sea hydrothermal vents in the western Pacific. While Chorocaris sp. 2 has only been observed at hydrothermal vent sites, M. lauensis can be found throughout the deep sea but occurs in higher abundance around the periphery of active vents We sequenced mitochondrial COI genes and deployed nuclear microsatellite markers for both species at three sites in Manus Basin and either North Fiji Basin (Chorocaris sp. 2) or Lau Basin (Munidopsis lauensis). We assessed genetic differentiation across a range of spatial scales, from approximately 2.5 km to more than 3000 km. Population structure for Chorocaris sp. 2 was comparable to that of the vent-associated snail Ifremeria nautilei, with a single seemingly well-mixed population within Manus Basin that is genetically differentiated from conspecifics in North Fiji Basin. Population structure for Munidopsis lauensis was more complex, with two genetically differentiated populations in Manus Basin and a third well-differentiated population in Lau Basin. The unexpectedly high level of genetic differentiation between M. lauensis populations in Manus Basin deserves further study since it has implications for conservation and management of diversity in deep-sea hydrothermal vent ecosystems.
authors.affiliation: Marine Laboratory, Nicholas School of the Environment, Duke University, Beaufort, North Carolina, United States of America.
authors.forename: Andrew David
authors.initials: AD
authors.lastname: Thaler
authors.affiliation: Marine Laboratory, Nicholas School of the Environment, Duke University, Beaufort, North Carolina, United States of America.
authors.forename: Sophie
authors.initials: S
authors.lastname: Plouviez
authors.affiliation: Nautilus Minerals, Port Moresby, NCD, Papua New Guinea.
authors.forename: William
authors.initials: W
authors.lastname: Saleu
authors.affiliation: Environmental Science and Geography Division, School of Natural and Physical Sciences, University of Papua New Guinea, Port Moresby, Papua New Guinea.
authors.forename: Freddie
authors.initials: F
authors.lastname: Alei
authors.affiliation: Marine Laboratory, Nicholas School of the Environment, Duke University, Beaufort, North Carolina, United States of America.
authors.forename: Alixandra
authors.initials: A
authors.lastname: Jacobson
authors.affiliation: Marine Laboratory, Nicholas School of the Environment, Duke University, Beaufort, North Carolina, United States of America.
authors.forename: Emily A
authors.initials: EA
authors.lastname: Boyle
authors.affiliation: Marine Laboratory, Nicholas School of the Environment, Duke University, Beaufort, North Carolina, United States of America.
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Schultz
authors.affiliation: School of Biology & Environmental Science, University College Dublin, Dublin, Ireland.
authors.forename: Jens
authors.initials: J
authors.lastname: Carlsson
authors.affiliation: Marine Laboratory, Nicholas School of the Environment, Duke University, Beaufort, North Carolina, United States of America.
authors.forename: Cindy Lee
authors.initials: CL
authors.lastname: Van Dover
mesh_terms: D000818:Animals; D033381:Anomura / Q000235:genetics*; D001483:Base Sequence; D033364:Decapoda / Q000235:genetics*; D003576:Electron Transport Complex IV / Q000235:genetics; D014644:Genetic Variation; D005828:Genetics, Population; D060086:Hydrothermal Vents; D018895:Microsatellite Repeats; D008928:Mitochondria / Q000235:genetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D017422:Sequence Analysis, DNA; D012908:Snails / Q000235:genetics
chemical_list: D003576:Electron Transport Complex IV