Dissertation Research: The Evolution of Hermaphroditism in  Anodonta (Bivalvia)
{'Code': '08010207', 'Directorate': {'Abbreviation': 'BIO', 'LongName': 'Direct For Biological Sciences'}, 'Division': {'Abbreviation': 'DEB', 'LongName': 'Division Of Environmental Biology'}}
{'SignBlockName': 'James E. Rodman', 'PO_EMAI': None, 'PO_PHON': None}
Graduate student W. R. Hoeh proposes to study the taxonomic                distribution of various reproductive strategies, especially                     simultaneous hermaphroditism, in the freshwater clam genus                      Anodonta.  Preliminary investigations using enzyme                              electrophoresis have shown notable variation in levels of self-                 vs. cross-fertilization, and this class of data will be used to                 identify "breeding system".  Restriction fragment patterns of                   mitochondrial DNA will be used to establish evolutionary                        relationships among regional species and subspecies.  The                       distribution of the various reproductive strategies will be                     studied by superimposing electrophoretic and morphological data                 from histological sections of reproductive tissue onto the                      evolutionary tree.  This treatment will reveal the number of                    times and the circumstances under which hermaphroditism has                     appeared in the group.                                                               The proposed research has implications beyond the immediate                area of specialization.  It will lead to a better understanding                 of the evolutionary history of the genus, and of the evolutionary               origins and significance of different reproductive strategies.
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{'Code': '1127', 'Text': 'Evolutionary Processes'}
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