scholarly journals Growth rates of natural tintinnid populations in Narragansett Bay

1986 ◽  
Vol 29 ◽  
pp. 117-126 ◽  
Author(s):  
PG Verity
Keyword(s):  
Growth Rates ◽  
Narragansett Bay

Growth Rates for Quahogs (Mercenaria mercenaria) in a Reduced Nitrogen Environment in Narragansett Bay, RI

2020 ◽  
Vol 27 (3) ◽  
pp. 534
Author(s):  
Sandra B. Robinson ◽  
Autumn Oczkowski ◽  
M. Conor McManus ◽  
Marnita Chintala ◽  
Suzanne Ayvazian
Keyword(s):  
Growth Rates ◽  
Mercenaria Mercenaria ◽  
Narragansett Bay ◽  
Reduced Nitrogen

scholarly journals Comparison of Guekensia Demissa Populations Along a Nitrogen Loading Gradient in Narragansett Bay, RI

2013 ◽  
Author(s):  
Janis Hall
Keyword(s):  
Rhode Island ◽  
Growth Rates ◽  
Salt Marshes ◽  
Condition Index ◽  
Nitrogen Loading ◽  
Narragansett Bay ◽  
The Other ◽  
Nitrogen Levels ◽  
Ribbed Mussels ◽  
Ribbed Mussel

<p>Anthropogenic eutrophication of coastal estuaries impacts these vital ecosystems by increasing primary production, hypoxic conditions, pathogen concentration, and greenhouse gas emissions, all of which are leading to the degradation of shorelines, disease transmission, and hypoxia-related fish kills. Narragansett Bay is a prominent feature of Rhode Island, making up over 500 km of coastline and acting as a watershed for over 2,000 square meters of land in both Massachusetts and Rhode Island. This estuary is important to both the economy of the state of Rhode Island and its fringing ecosystems are necessary for a healthy shoreline. The beaches of Narragansett Bay revenue over $5 billion a year in tourism, stimulate more than 40,000 jobs, and are a source of many economically important marine organisms such as oysters, mussels, hard shell clams, finfish, and lobsters. The numerous fringing habitats of Narragansett Bay, including rocky intertidal zones, seagrasses, and estuarine marshes all play important roles for the coastline of Rhode Island, with salt marshes accounting for more than 600 ha of the shoreline.</p> <p>Salt marshes along Narragansett Bay serve many ecological roles including water quality maintenance, storm surge reduction, erosion control, and habitat and food to fish and wildlife. The ribbed mussel, Geukensia demissa is the biomass-dominant benthic invertebrate in coastal marshes and is a foundation species, providing habitats for other organisms. Ribbed mussels have also been found to be a useful indicator species of nitrogen levels within Narragansett Bay, exhibiting increases in nitrogen-loads with greater biomass, density, and growth rates, and the <strong>δ</strong>15N signatures of G. demissa tissues reflect anthropogenic-derived nitrogen. The purpose of my thesis was to compare ribbed mussel populations in some of the same salt marshes along the well-documented nitrogen-loading gradient, 14 years after the previous studies and following the installation of one phase of a two-part wastewater reduction program into the bay. In addition, my work is part of a larger effort to investigate changes in greenhouse gas emissions by plants, sediment microbiota, and gut microbiota in the ribbed mussels, in response nitrogen-loading and elevated temperatures. Characterizing the mussel populations is integral to understanding the effects of global change on the Narragansett Bay ecosystem.</p> <p>The density, biomass, condition index, and growth rates of ribbed mussels were all positively correlated with the nitrogen-loading gradient in Narragansett Bay. Fecundity did not follow the same pattern but was significantly greater in June at one of the marshes and was negatively correlated with shell length and condition index. These results suggest that although mussels reproduce continuously, gametogenesis and spawning may have occurred prior to sampling. Another unexpected outcome is that with greater food availability resulting from nitrogen-loading, there are both costs and benefits. At the marsh with the highest nitrogen levels, Apponaug, the recruitment, growth, and condition index of the mussels were all significantly greater than at the other two marshes, but the high density may have limited the size of the mussels or even contributed to higher rates of mortality through intraspecific competition. At the opposite end of the nitrogen-loading gradient, mussels at Fox Hill had the greatest average shell length, but the density, biomass, condition index, recruitment, and growth rates were significantly lower than the other two marshes, suggesting that this less perturbed marsh may still be nitrogen-limited despite the historical nitrogen-loading in Narragansett Bay.</p> <p>The results from this study are critical for documenting the variation among the ribbed mussel populations within differing nitrogen-loaded marshes, but will also be used as a benchmark for a longer-term study analyzing the historical responses of this species to changes in nutrient loads into Narragansett Bay.</p>

Reduced growth rates of hair in mice following radiation

1966 ◽  
Vol 94 (4) ◽  
pp. 491-498 ◽  
Author(s):  
F. D. Malkinson
Keyword(s):  
Growth Rates

Institutional Theory of Endless Redistribution

2005 ◽  
pp. 4-18 ◽  
Author(s):  
K. Sonin
Keyword(s):  
Property Rights ◽  
Institutional Theory ◽  
Growth Rates ◽  
Rent Seeking ◽  
Economic Institutions ◽  
Wide Spread ◽  
Grass Roots ◽  
Protection Systems ◽  
Private Protection ◽  
The Rich

In unequal societies, the rich may benefit from shaping economic institutions in their favor. This paper analyzes the dynamics of institutional subversion by focusing on public protection of property rights. If this institution functions imperfectly, agents have incentives to invest in private protection of property rights. The ability to maintain private protection systems makes the rich natural opponents of public protection of property rights and precludes grass-roots demand to drive the development of the market-friendly institution. The economy becomes stuck in a bad equilibrium with low growth rates, high inequality of income, and wide-spread rent-seeking. The Russian oligarchs of the 1990s, who controlled large stakes of newly privatized property, provide motivation for this paper.

Waiting for a New Model of Growth: Russia’s Social and Economic Development in 2013

2014 ◽  
pp. 4-32 ◽  
Author(s):  
V. Mau
Keyword(s):  
Economic Policy ◽  
Economic Development ◽  
Economic Performance ◽  
Growth Rates ◽  
Global Crisis ◽  
New Model ◽  
Social And Economic Development ◽  
Economic Risks

The paper deals with Russian social and economic development in 2013 and prospects for the next year or two. The author discusses the logic and trends of the global crisis started in 2008. This is the basis for further analysis of current Russian economic performance with special emphasis on the problem of growth rates deceleration. Special attention is paid to economic risks and priorities of economic policy.

Impacts of Paris Agreement on Russian economy

2018 ◽  
pp. 76-94 ◽  
Author(s):  
I. A. Makarov ◽  
C. Henry ◽  
V. P. Sergey
Keyword(s):  
Climate Change ◽  
Economic Policy ◽  
Growth Rates ◽  
Paris Agreement ◽  
Gdp Growth ◽  
Russian Economy ◽  
Climate Policies

The paper applies multiregional CGE Economic Policy Projection and Analysis (EPPA) model to analyze major risks the Paris Agreement on climate change adopted in 2015 brings to Russia. The authors come to the conclusion that if parties of the Agreement meet their targets that were set for 2030 it may lead to the decrease of average annual GDP growth rates by 0.2-0.3 p. p. Stricter climate policies beyond this year would bring GDP growth rates reduction in2035-2050 by additional 0.5 p. p. If Russia doesn’t ratify Paris Agreement, these losses may increase. In order to mitigate these risks, diversification of Russian economy is required.

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