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Michael A Rice

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Notes On The Identification And Distribution Of The Exotic Western Hemisphere Mussel, Mytella Charruana D'Orbigny 1846, In The Estuaries Of Pangasinan, Philippines., Michael Rice, Paul Rawson, Westly Rosario Jan 2016

Notes On The Identification And Distribution Of The Exotic Western Hemisphere Mussel, Mytella Charruana D'Orbigny 1846, In The Estuaries Of Pangasinan, Philippines., Michael Rice, Paul Rawson, Westly Rosario

Michael A Rice

In February 2015, mussels were found in Pangasinan different from native mytilids, Perna viridis, Modiolus philippinarum and M. modulaides (=M. metcalfei).  These mussels with a thick black periostracum were first reported in the Calmay 16.0272oN, 120.3147oE  near the village (Dagupan).  Samples of ~50 mussels were preserved in 95% ethanol and sent to Maine for genetic evaluation using amplified mtDNA sequences coding for cytochrome oxidase 1 (mtCO1) using universal LCO and HCO primers, and then sequenced with LCO primers.  P. viridis and Modiolus brasiliensis are the closest cladistic outgroups to the Mytella phylogeny, with the latter showing the closest …

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Gonadal Cycle Of Northern Quahogs, Mercenaria Mercenaria (Linne, 1758), From Fished And Non-Fished Subpopulations In Narragansett Bay, Dora Marroquin-Mora, Michael Rice Apr 2013

Gonadal Cycle Of Northern Quahogs, Mercenaria Mercenaria (Linne, 1758), From Fished And Non-Fished Subpopulations In Narragansett Bay, Dora Marroquin-Mora, Michael Rice

Michael A Rice

To determine if population density in areas closed to fishing in Narragansett Bay is causing differences in the reproductive potential of the organisms, this study used two approaches to determine the reproductive condition of the animals. The first approach consisted in employing a gravimetric condition index (CI) to evaluate the general condition of quahogs from nine different sites, 3 sites open conditionally for fishing (conditional areas) and 6 sites closed to fishing. The second approach was a determination of gonadal index (GI) of a subset of the sample sites, by histological observation of gonadal tissue sections. Initial sampling included determination …

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