Abstract

The genetic population structures of the landlocked shrimp, Neocaridina denticulata denticulata , and the amphidromous shrimp, Caridina leucosticta , were compared in order to evaluate the effect of dispersal ability on the genetic structure. This chapter examines the mitochondrial DNA (mtDNA) sequence variations of the region extending from the NADH dehydrogenase subunit 2 (ND2) gene to the tryptophan transfer RNA gene and the region encoding NADH dehydrogenase subunit 5 (ND5) gene in 120 specimens of N. d. denticulata from six locations and 160 specimens of C. leucosticta from eight locations. The neighbour joining tree showed several distinct clades roughly corresponding to the local populations within N. d. denticulata , but no distinct clades within C. leucosticta . Pairwise Φ ST and AMOVA also indicated a significantly strong genetic differentiation among local populations of N. d. denticulata , but no or little genetic differentiation among local populations of C. leucosticta . Keywords:amphidromous shrimp; Caridina leucosticta ; mitochondrial DNA; NADH dehydrogenase subunit 2 (ND2); NADH dehydrogenase subunit 5 (ND5); Neocaridina denticulata denticulata ; RNA gene

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