title: Androgenetic reproduction in a freshwater diploid clam Corbicula fluminea (Bivalvia: Corbiculidae).
abstract: Two shell color types of the exotic bivalve Corbicula fluminea were collected in Kyoto city, Japan. DNA microfluorometry revealed that both types were diploids with non-reductional spermatozoa. Maternal chromosomes were found to be extruded as two polar bodies at the first meiosis, and the second meiosis could not be observed. Only the male pronucleus was present in the egg cytoplasm and became metaphase chromosomes at the first mitosis. The present study indicates that the diploid C. fluminea in Japan has the same mode of androgenetic reproduction as the triploid C. leana.
authors.affiliation: Faculty of Bioresources, Mie University, Japan. od32236@cc.mie-u.ac.jp
authors.forename: Ryo
authors.initials: R
authors.lastname: Ishibashi
authors.forename: Kennichi
authors.initials: K
authors.lastname: Ookubo
authors.forename: Mina
authors.initials: M
authors.lastname: Aoki
authors.forename: Minako
authors.initials: M
authors.lastname: Utaki
authors.forename: Akira
authors.initials: A
authors.lastname: Komaru
authors.forename: Kouichi
authors.initials: K
authors.lastname: Kawamura
mesh_terms: D000728:Androgens / Q000494:pharmacology*; D000818:Animals; D049872:Bivalvia / Q000235:genetics* / Q000502:physiology*; D003592:Cytophotometry; D004247:DNA / Q000032:analysis; D005260:Female; D005306:Fertilization / Q000502:physiology*; D008297:Male; D008540:Meiosis / Q000502:physiology*; D010858:Pigmentation; D011003:Ploidies; D015053:Zygote / Q000502:physiology
chemical_list: D000728:Androgens; D004247:DNA