scholarly journals Nitrogen isotope ratios identify nitrate contamination sources

1996 ◽  
Vol 50 (2) ◽  
pp. 32-36 ◽  
Author(s):  
Dennis E. Rolston ◽  
Graham E. Fogg ◽  
David L. Decker ◽  
Dianne T. Louie ◽  
Mark E. Grismer
Keyword(s):  
Nitrogen Isotope ◽  
Isotope Ratios ◽  
Nitrate Contamination ◽  
Contamination Sources

Spatial Variation in Nitrogen Isotope Values Beneath Nitrate Contamination Sources

Ground Water ◽  
1998 ◽  
Vol 36 (3) ◽  
pp. 418-426 ◽  
Author(s):  
Graham E. Fogg ◽  
D.E. Rolston ◽  
D.L. Decker ◽  
D.T. Louie ◽  
M.E. Grismer
Keyword(s):  
Spatial Variation ◽  
Nitrogen Isotope ◽  
Nitrate Contamination ◽  
Contamination Sources

scholarly journals Ecological aspects of carbon and nitrogen isotope ratios of cyanobacteria

2012 ◽  
Vol 7 (3) ◽  
pp. 135-145 ◽  
Author(s):  
Eitaro Wada ◽  
Kaori Ohki ◽  
Shinya Yoshikawa ◽  
Patrick L. Parker ◽  
Chase Van Baalen ◽  
...  
Keyword(s):  
Nitrogen Isotope ◽  
Isotope Ratios ◽  
Carbon And Nitrogen ◽  
Ecological Aspects

scholarly journals Changing patterns of habitat use by southern right whales (Eubalaena australis) on their nursery ground at Península Valdés, Argentina, and in their long-range movements

2020 ◽  
pp. 133-143
Author(s):  
Victoria J. Rowntree ◽  
Roger S. Payne ◽  
Donald M. Schell
Keyword(s):  
Habitat Use ◽  
Nitrogen Isotope ◽  
Isotope Ratios ◽  
Small Scale ◽  
Nursery Ground ◽  
Adult Males ◽  
Human Disturbances ◽  
Eubalaena Australis ◽  
Right Whales ◽  
Southern Right Whales

Southern right whales (Eubalaena australis) have been studied on their nursery ground at Península Valdés, Argentina, every year since 1970. Since 1990, 1,208 individuals have been identified from photographs taken during annual aerial surveys; 618 whales were seen in two or more years. Patterns of habitat use have changed during the study in ways which suggest that right whales may be capable of substantial behavioral and ecological flexibility. One male and three females from Península Valdés have been sighted on other nursery grounds (Tristan da Cunha and southern Brazil). Three individuals from Península Valdés were sighted on feeding grounds off Shag Rocks and South Georgia. Some right whales from Península Valdés showed carbon and nitrogen isotope ratios very similar to those seen in right whales off South Africa, while others showed distinctive isotope ratios indicating that they fed in a different area. Whales of all ages and both sexes moved frequently between three major regions of concentration on the Península Valdés nursery ground. Subadults and adult females with calves were resighted at higher rates than adult males and females in non-calf years. Changes in the geographic distribution of whales at the Península include: (1) abandonment of a major region of concentration; (2) establishment of a nursery area adjacent to thecentre of a growing whalewatching industry; and (3) small-scale shifts in distribution, possibly in response to natural and human disturbances.

scholarly journals Nitrogen isotope ratios of nitrate and N* anomalies in the subtropical South Pacific

2015 ◽  
Vol 16 (5) ◽  
pp. 1439-1448 ◽  
Author(s):  
Chisato Yoshikawa ◽  
Akiko Makabe ◽  
Takuhei Shiozaki ◽  
Sakae Toyoda ◽  
Osamu Yoshida ◽  
...  
Keyword(s):  
South Pacific ◽  
Nitrogen Isotope ◽  
Isotope Ratios

Evidence from nitrogen isotope ratios for enhanced productivity during formation of eastern Mediterranean sapropels

Nature ◽  
1992 ◽  
Vol 359 (6392) ◽  
pp. 223-225 ◽  
Author(s):  
S. E. Calvert ◽  
B. Nielsen ◽  
M. R. Fontugne
Keyword(s):  
Eastern Mediterranean ◽  
Nitrogen Isotope ◽  
Isotope Ratios

Interstellar Nitrogen Isotope Ratios

1985 ◽  
pp. 585-586
Author(s):  
R. Güsten ◽  
H. Ungerechts
Keyword(s):  
Nitrogen Isotope ◽  
Isotope Ratios
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