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Full-Text Articles in Physical Sciences and Mathematics
Whaling Dispute Continues, Andrew Dizon, Phillip Clapham, William Perrin, Robert L. Brownell Jr.
Whaling Dispute Continues, Andrew Dizon, Phillip Clapham, William Perrin, Robert L. Brownell Jr.
United States Department of Commerce: Staff Publications
Apparently alarmed that an advertisement in Nature referencing the study of Baker and Palumbi (Science 265, 1538; 1994) might lend undeserved credence to the notion that illegal whale products find their way into Japanese markets, Milton Freeman (Nature 376, 11; 1995) reiterates the arguments of the Fisheries Agency of Japan (FAJ) that the study is fundamentally flawed. As Freeman's letter contains several serious errors, we feel obliged to comment.
Whaling Error, Robert L. Brownell Jr.
Whaling Error, Robert L. Brownell Jr.
United States Department of Commerce: Staff Publications
You published recently (Nature 374, 587; 1995) a report headed "Error re-opens 'scientific' whaling debate".
The error in question, however, relates to commercial whaling, not to scientific whaling. Although Norway cites science as a basis for the way in which it sets its own quota. scientific whaling means something quite different. namely killing whales for research purposes. Any member of the International Whaling Commission (IWC) has the right to conduct a research catch under the International Convention for the Regulation of Whaling. 1946. The IWC has reviewed new research or scientific whaling programs for Japan and Norway since the …
Filtration Rates Of The Zebra Mussel (Dreissena Polymorpha) On Natural Seston From Saginaw Bay, Lake Huron, David L. Fanslow, Thomas F. Nalepa, Gregory A. Lang
Filtration Rates Of The Zebra Mussel (Dreissena Polymorpha) On Natural Seston From Saginaw Bay, Lake Huron, David L. Fanslow, Thomas F. Nalepa, Gregory A. Lang
United States Department of Commerce: Staff Publications
Filtration rates of the zebra mussel (Dreissena polymorpha) on natural seston from two different regions in Saginaw Bay were determined on a monthly basis from April to October in 1992 and 1993. The two regions represent contrasting trophic conditions, with the inner bay more eutrophic than the outer bay. Mean filtration rate was 16.2 mL/mg/h (range 4.0 to 40.7 mL/mg/h) over the entire 2-year period. Filtration rates on seston from the inner bay were significantly lower than rates on seston from the outer bay in 1992, but no differences were apparent in 1993. Lower rates were attributed to …
Initial Colonization Of The Zebra Mussel (Dreissena Polymorpha) In Saginaw Bay, Lake Huron: Population Recruitment, Density, And Size Structure, Thomas F. Nalepa, James A. Wojcik, David L. Fanslow, Gregory A. Lang
Initial Colonization Of The Zebra Mussel (Dreissena Polymorpha) In Saginaw Bay, Lake Huron: Population Recruitment, Density, And Size Structure, Thomas F. Nalepa, James A. Wojcik, David L. Fanslow, Gregory A. Lang
United States Department of Commerce: Staff Publications
The various life stages of the zebra mussel (Dreissena polymorpha) were examined during the initial years (1991-93) of the mussel's invasion into Saginaw Bay, Lake Huron. Yearly trends in densities of larvae, newly-settled juveniles, and adults were poorly related. Larval densities were lowest in 1991 and increased each year, but the number of settled juveniles was highest in 1991. Adults increased between 1991 and 1992 and then declined in 1993. Mean adult densities at sites with hard substrates were 11,700,33,200, and 4,1001m2 in each of the 3 years, respectively. Year-to-year variation at individual sites was high and likely …
U.S. Pacific Marine Mammal Stock Assessments, Jay Barlow, Robert L. Brownell Jr., Douglas P. Demaster, Karin A. Forney, Mark S. Lowry, Steven Osmek, Timothy J. Ragen, Randall R. Reeves, Robert J. Small
U.S. Pacific Marine Mammal Stock Assessments, Jay Barlow, Robert L. Brownell Jr., Douglas P. Demaster, Karin A. Forney, Mark S. Lowry, Steven Osmek, Timothy J. Ragen, Randall R. Reeves, Robert J. Small
United States Department of Commerce: Staff Publications
Under the 1994 amendments to the Marine Mammal Protection Act, the National Marine Fisheries Service (NMFS) and the U.S. Fish and Wildlife Service (USFWS) were required to produce stock assessment reports for all marine mammal stocks in waters within the U.S. Exclusive Economic Zone. This document contains the stock assessment reports for the U.S. Pacific marine mammal stocks under NMFS jurisdiction. Marine mammal species which are under the management jurisdiction of the USFWS are not included in this report. A separate report containing background, guidelines for preparation, and .a summary of all stock assessment reports is available from the NMFS …
Dreissena Polymorpha In The Saginaw Bay, Lake Huron Ecosystem: Overview And Perspective, Thomas F. Nalepa, Gary L. Fahnenstiel
Dreissena Polymorpha In The Saginaw Bay, Lake Huron Ecosystem: Overview And Perspective, Thomas F. Nalepa, Gary L. Fahnenstiel
United States Department of Commerce: Staff Publications
After the zebra mussel, Dreissena polymorpha, was first discovered in Lake St. Clair in 1988 and rapidly spread throughout the Great Lakes, broad ecological changes became apparent in regions where this species was most abundant. Previous investigations documented dramatic increases in water clarity (Hebert et al. 1991, Marsden et al. 1993, Leach 1993), declines in chlorophyll and phytoplankton abundances (Leach 1993, Nicholls and Hopkins 1993, Holland 1993), and changes in benthic invertebrate communities (Griffiths 1993, Dermott et al. 1993, Stewart and Haynes 1994). These studies were conducted in various regions and defined impacts on a specific ecosystem component. Taken …
Nutrient Changes In Saginaw Bay, Lake Huron, After The Establishment Of The Zebra Mussel (Dreissena Polymorpha), Thomas H. Johengen, Thomas F. Nalepa, Gary L. Fahnenstiel, Greg Goudy
Nutrient Changes In Saginaw Bay, Lake Huron, After The Establishment Of The Zebra Mussel (Dreissena Polymorpha), Thomas H. Johengen, Thomas F. Nalepa, Gary L. Fahnenstiel, Greg Goudy
United States Department of Commerce: Staff Publications
Concentrations of particulate and dissolved nutrients in Saginaw Bay, Lake Huron, were examined relative to zebra mussel colonization which occurred summer 1991. The magnitude and spatial pattern of changes indicate that mussels had a significant impact on nutrients in Saginaw Bay. Annual means for total suspended solids, particulate organic carbon, particulate phosphorus, and particulate silica in the inner bay were significantly lower in 1992 and 1993 (post-zebra mussel) than in 1991 (pre-zebra mussel). Annual means decreased from 11.5 mg L-1, 1.45 mg C L-1 (121 µM), 20.4 µg P L-1(0.66 µM), and 1.52 mg SiO …
Effects Of Zebra Mussel (Dreissena Polymorpha) Colonization On Water Quality Parameters In Saginaw Bay, Lake Huron, Gary L. Fahnenstiel, Gregory A. Lang, Thomas F. Nalepa, Thomas H. Johengen
Effects Of Zebra Mussel (Dreissena Polymorpha) Colonization On Water Quality Parameters In Saginaw Bay, Lake Huron, Gary L. Fahnenstiel, Gregory A. Lang, Thomas F. Nalepa, Thomas H. Johengen
United States Department of Commerce: Staff Publications
A large-scale study of Saginaw Bay was initiated in 1990 and continued through 1993 to examine the effects of the zebra mussel colonization which began in summerlfall 1991. Saginaw Bay responded quickly to the zebra mussel colonization, as fall 1991 values of chlorophyll were similar to 1992 and 1993 values. In inner Saginaw Bay, where most zebra mussels were found, chlorophyll, kPAR, and total phosphorus values decreased, and Secchi disk depth increased during the study period, regardless of the presence or absence of zebra mussels at a specific station. At outer bay control stations no significant differences were found for …