Post-ice age recolonization and differentiation of Fucus serratus L. (Phaeophyceae; Fucaceae) populations in Northern Europe

Autor: A.F. Peters, James A. Coyer, Jeanine L. Olsen, Wytze T. Stam
Jazyk: angličtina
Rok vydání: 2003
Předmět:
0106 biological sciences
Heterozygote
Range (biology)
Fucus serratus
MITOCHONDRIAL-DNA
Population
SUCCESSFUL EXTERNAL FERTILIZATION
010603 evolutionary biology
01 natural sciences
ice ages
ALGA PHYCODRYS RUBENS
microsatellites
Evolution
Molecular
Refugium (population biology)
Genetics
genetic structure
Cluster Analysis
14. Life underwater
education
Atlantic Ocean
Alleles
Phylogeny
Ecology
Evolution
Behavior and Systematics
Isolation by distance
MARINE SEAWEEDS
education.field_of_study
Geography
biology
Ecology
010604 marine biology & hydrobiology
MICROSATELLITE MARKERS
Genetic Variation
GENETIC DIFFERENTIATION
POSTGLACIAL COLONIZATION
15. Life on land
biology.organism_classification
Fucaceae
Europe
seaweeds
EVANESCENS HETEROKONTOPHYTA
Genetics
Population
Fucus
Genetic structure
Biological dispersal
BALTIC SEA
Microsatellite Repeats
HETEROZYGOTE DEFICIENCY
Zdroj: Molecular Ecology, 12(7), 1817-1829. Wiley
ISSN: 0962-1083
DOI: 10.1046/j.1365-294X.2003.01850.x
Popis: The seaweed Fucus serratus is hypothesized to have evolved in the North Atlantic and present populations are thought to reflect recolonization from a southern refugium since the last glacial maximum 18 000-20 000 years bp. We examined genetic structure across several spatial scales by analysing seven microsatellite loci in populations collected from 21 localities throughout the species' range. Spatial auto-correlation analysis of seven microsatellite loci revealed no evidence for spatial clustering of alleles on a scale of 100 m despite limited gamete dispersal in F. serratus of approximate to 2 m from parental individuals. Pairwise theta analysis suggested that the minimal panmictic unit for F. serratus was between 0.5 and 2 km. Isolation by distance was significant along some contiguous coastlines. Population differentiation was strong within the Skagerrak-Kattegat-Baltic Seas (SKB) (global theta = 0.17) despite a short history of approximate to 7500 years. A neighbour-joining tree based on Reynold's distances computed from the microsatellite data revealed a central assemblage of populations on the Brittany Peninsula surrounded by four well-supported clusters consisting of the SKB, the North Sea (Ireland, Helgoland), and two populations from the northern Spanish coast. Samples from Iceland and Nova Scotia were most closely aligned with northwest Sweden and Brittany, respectively. When sample sizes were standardized (N = 41), allelic diversity was twofold higher for Brittany populations than for populations to the north and threefold higher than southern populations. The Brittany region may be a refugium or a recolonized area, whereas the Spanish populations most likely reflect present-day edge populations that have undergone repeated bottlenecks as a consequence of thermally induced cycles of recolonization and extinction.
Databáze: OpenAIRE
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