Open AccessGenetic structure of populations of the closely related species of Melanopsis (Gastropoda: Cerithiacea) in Israel
Author(s) -
FALNIOWSKI A.,
HELLER J.,
MAZANMAMCZARZ K.,
SZAROWSKA M.
Publication year - 2002
Publication title -
journal of zoological systematics and evolutionary research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.769
H-Index - 50
eISSN - 1439-0469
pISSN - 0947-5745
DOI - 10.1046/j.1439-0469.2002.00182.x
Subject(s) - biology , gastropoda , linkage disequilibrium , inbreeding , subspecies , genetic distance , population , genetic structure , zoology , evolutionary biology , genetics , allele , genetic variation , gene , haplotype , demography , sociology
Population genetic structure in the species of Melanopsis were studied by means of cellulose acetate gel allozyme electrophoresis, on 26 Melanopsis populations from Israel: six of Melanopsis buccinoidea Olivier, 1801, eight of Melanopsis saulcyi Bourguignat, 1853, one of Melanopsis meiostoma Heller et Sivan, 2000, 11 of Melanopsis costata Olivier, 1804, represented by two subspecies: M. costata costata Olivier, 1804 and M. costata jordanica Roth, 1839. 14 loci (nine polymorphic) were scorable: Aat, Alp, Est‐1, Est‐2, Gpi, Hbdh, Idh‐1, Idh‐2, Iddh, Mdh, Mdhp, Mpi, Pgdh, Pgm. Gametic disequilibrium was postulated. D‐statistics was computed, indicating limited migration, not epistatic selection as the source of disequilibrium. Exact multilocus and multipopulation tests showed a statistically significant heterozygote deficit in 18 populations and seven polymorphic loci. Inbreeding, Wahlund's effect and codominant mode of selection were postulated as causing homozygote excess. Mantel test indicated a statistically significant association between the pairwise θ and geographic distance, and no association between Nm and the geographic distance. The mean gene flow estimates Nm, derived from either θ or private alleles technique, were consistent. Hierarchical F‐statistics showed slight differences between the taxa. The process of speciation within the genus seems not yet completed.