title: Temporal Stability of Genetic Structure in a Mesopelagic Copepod.
abstract: Although stochasticity in oceanographic conditions is known to be an important driver of temporal genetic change in many marine species, little is known about whether genetically distinct plankton populations can persist in open ocean habitats. A prior study demonstrated significant population genetic structure among oceanic gyres in the mesopelagic copepod Haloptilus longicornis in both the Atlantic and Pacific Oceans, and we hypothesized that populations within each gyre represent distinct gene pools that persist over time. We tested this expectation through basin-scale sampling across the Atlantic Ocean in 2010 and 2012. Using both mitochondrial (mtCOII) and microsatellite markers (7 loci), we show that the genetic composition of populations was stable across two years in both the northern and southern subtropical gyres. Genetic variation in this species was partitioned among ocean gyres (FCT = 0.285, P < 0.0001 for mtCOII, FCT = 0.013, P < 0.0001 for microsatellites), suggesting strong spatial population structure, but no significant partitioning was found among sampling years. This temporal persistence of population structure across a large geographic scale was coupled with chaotic genetic patchiness at smaller spatial scales, but the magnitude of genetic differentiation was an order of magnitude lower at these smaller scales. Our results demonstrate that genetically distinct plankton populations persist over time in highly-dispersive open ocean habitats, and this is the first study to rigorously test for temporal stability of large scale population structure in the plankton.
authors: Department of Oceanography, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii, 96822, United States of America.
authors: Erica
authors: E
authors: Goetze
authors: Department of Oceanography, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii, 96822, United States of America; Department of Fish & Wildlife Sciences, University of Idaho, Moscow, Idaho, 83844, United States of America.
authors: Kimberly R
authors: KR
authors: Andrews
authors: Naturalis Biodiversity Center, P.O. Box 9517, 2300 RA, Leiden, The Netherlands; Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, P.O. box 94248, 1090 GE, Amsterdam, The Netherlands.
authors: Katja T C A
authors: KT
authors: Peijnenburg
authors: Department of Oceanography, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii, 96822, United States of America.
authors: Elan
authors: E
authors: Portner
authors: Department of Oceanography, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii, 96822, United States of America.
authors: Emily L
authors: EL
authors: Norton
mesh_terms: D000818:Animals; D001267:Atlantic Ocean; D033342:Copepoda / Q000235:genetics*; D004272:DNA, Mitochondrial / Q000235:genetics; D017753:Ecosystem; D051456:Gene Flow; D005828:Genetics, Population; D018895:Microsatellite Repeats / Q000235:genetics; D010140:Pacific Ocean; D010933:Plankton / Q000235:genetics*
chemical_list: D004272:DNA, Mitochondrial