Nitrogen transfer from sea to land via commercial fisheries

2008 ◽  
Vol 1 (2) ◽  
pp. 111-112 ◽  
Author(s):  
R. Maranger ◽  
N. Caraco ◽  
J. Duhamel ◽  
M. Amyot
Keyword(s):  
Nitrogen Transfer ◽  
Commercial Fisheries

Predicting changes in distribution of a large coastal shark in the face of the strengthening East Australian Current

2020 ◽  
Vol 642 ◽  
pp. 163-177 ◽  
Author(s):  
Y Niella ◽  
AF Smoothey ◽  
V Peddemors ◽  
R Harcourt
Keyword(s):  
Austral Summer ◽  
Conservation Strategies ◽  
Limiting Factor ◽  
Commercial Fisheries ◽  
East Australian Current ◽  
Spatial And Temporal Patterns ◽  
Marine Animals ◽  
Factors Affecting ◽  
Southeastern Australia ◽  
The Face

In the face of accelerating climate change, conservation strategies will need to consider how marine animals deal with forecast environmental change as well as ongoing threats. We used 10 yr (2009-2018) of data from commercial fisheries and a bather protection program along the coast of New South Wales (NSW), southeastern Australia, to investigate (1) spatial and temporal patterns of occurrence in bull sharks and (2) environmental factors affecting bull shark occurrence along the coast of NSW. Predicted future distribution for this species was modelled for the forecast strengthening East Australian Current. Bull sharks were mostly harvested in small to larger estuaries, with average depth and rainfall responsible for contrasting patterns for each of the fisheries. There was an increase in the occurrence of bull sharks over the last decade, particularly among coastal setline fisheries, associated with seasonal availability of thermal gradients >22°C and both westward and southward coastal currents stronger than 0.15 and 0.60 m s-1, respectively, during the austral summer. Our model predicts a 3 mo increase in the availability of favourable water temperatures along the entire coast of NSW for bull sharks by 2030. This coastline provides a uniquely favourable topography for range expansion in the face of a southerly shift of warmer waters, and habitat is unlikely to be a limiting factor for bull sharks in the future. Such a southerly shift in distribution has implications for the management of bull sharks both in commercial fisheries and for mitigation of shark-human interactions.

Status of Commercial Fisheries in the Kingdom of Bahrain

2013 ◽  
Vol 26 (1 (special Issue)) ◽  
pp. 220-238 ◽  
Author(s):  
Thamer S. Ali ◽  
Asma A. Abahussain
Keyword(s):  
Commercial Fisheries

Researching nitrogen solubility in nitrogen-containing austenitic steels at melting and recrystallization by CALPHAD method

2019 ◽  
pp. 53-66 ◽  
Author(s):  
L. A. Smirnov ◽  
I. I. Gorbachev ◽  
V. V. Popov ◽  
A. Yu. Pasynkov ◽  
A. S. Oryshchenko ◽  
...  
Keyword(s):  
Global Minimum ◽  
Nitrogen Solubility ◽  
Thermodynamic Description ◽  
Solidus Temperature ◽  
Liquidus Line ◽  
Calphad Method ◽  
Austenitic Steels ◽  
Nitrogen Transfer ◽  
Fixed Nitrogen ◽  
System Phase

The CALPHAD method has been employed to compose thermodynamic description of the Fe–Cr–Mn–Ni–Si–C–N system. Using an algorithm based on finding a global minimum of Gibbs energy, the calculations of system phase composition were performed in the temperature range from 1750°C to hardening and in the range of compositions corresponding to 04Kh20N6G11M2AFB steel. Calculations showed that at temperatures above liquidus line, Cr and Mn increase nitrogen solubility in the melt, while Ni and Si reduce it. With an increase in the content of Cr, Mn, Ni, and Si in steel in the studied composition range, both liquidus and solidus temperature decrease. The degree of influence on these temperatures of Cr, Mn, Ni and Si within the steel grade is different and ranges from ~3 to ~14°C. Calculations taking into account the possibility of nitrogen transfer between steel and the atmosphere of air showed that the amount of fixed nitrogen in the alloy under study varies, depending on the composition of the steel and temperature, from ~0.3 to ~0.6 wt%. As the temperature decreases from liquidus to solidus, the amount of fixed nitrogen increases, with the exception of those steel compositions when ferrite and not austenite is released from the liquid phase.

Who's onboard? A predictive analysis of cooperative formation in commercial fisheries

2021 ◽  
Vol 279 ◽  
pp. 111715
Author(s):  
Michael De Alessi ◽  
Michael C. Melnychuk ◽  
Edward Wort ◽  
Ray Hilborn
Keyword(s):  
Predictive Analysis ◽  
Commercial Fisheries

Book Reviews

2014 ◽  
Vol 52 (2) ◽  
pp. 565-567
Keyword(s):  
Oil And Gas ◽  
Arctic Region ◽  
Economic Benefits ◽  
Infrastructure Investment ◽  
Commercial Fisheries ◽  
International Studies ◽  
Oil And Gas Development ◽  
Resource Exploration ◽  
Benefits And Costs

Michael A. Goldstein, Professor of Finance, Babson College reviews “Arctic Economics in the 21st Century: The Benefits and Costs of Cold” by Heather A. Conley. The Econlit abstract of this book begins: “Explores the economic benefits of an increasingly open Arctic region and the costs of exploring the riches of the American Arctic. Discusses Arctic frontiers; U.S. Arctic oil and gas development; Arctic mineral resource exploration; Arctic destination and trans-shipping; Arctic commercial fisheries; Arctic ecotourism; and Arctic infrastructure investment. Conley is Director and Senior Fellow of the Europe Program at the Center for Strategic and International Studies.”

Fish Attraction with Pulsed Low-Frequency Sound

1968 ◽  
Vol 25 (7) ◽  
pp. 1441-1452 ◽  
Author(s):  
Joseph D. Richard
Keyword(s):  
Acoustic Stimulus ◽  
Low Frequency ◽  
Reef Fishes ◽  
Test Site ◽  
Acoustic Signals ◽  
Commercial Fisheries ◽  
Test Results ◽  
Potential Applications ◽  
Predatory Fishes ◽  
Underwater Television

A series of tests were conducted to determine the effectiveness of pulsed low-frequency acoustic signals for attracting fishes. The acoustic signals were contrived to simulate the hydrodynamically generated disturbances normally associated with active predation. Underwater television was used to observe fish arrivals during both control and test periods. Demersal predatory fishes were successfully attracted although they habituated rapidly to the acoustic stimulus. Members of the families Serranidae, Lutjanidae, and Pomadasyidae were particularly well represented among the fishes attracted. Sharks were also attracted in considerable numbers. Herbivorous reef fishes, although common around the test site, were not attracted. Possible relationships between the test results and the hearing capabilities of fishes are discussed. It is concluded that acoustic attraction techniques have potential applications in certain existing commercial fisheries.

scholarly journals Is nitrogen transfer among plants enhanced by contrasting nutrient-acquisition strategies?

2014 ◽  
Vol 38 (1) ◽  
pp. 50-60 ◽  
Author(s):  
FRANÇOIS P. TESTE ◽  
ERIK J. VENEKLAAS ◽  
KINGSLEY W. DIXON ◽  
HANS LAMBERS
Keyword(s):  
Nutrient Acquisition ◽  
Nitrogen Transfer ◽  
Acquisition Strategies
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