Elucidating food web structure of the Poyang Lake ecosystem using amino acid nitrogen isotopes and Bayesian mixing model

2019 ◽  
Vol 17 (11) ◽  
pp. 555-564 ◽  
Author(s):  
Zhongyi Zhang ◽  
Jing Tian ◽  
Yansheng Cao ◽  
Nengjian Zheng ◽  
Jingjing Zhao ◽  
...  
Keyword(s):  
Amino Acid ◽  
Food Web ◽  
Nitrogen Isotopes ◽  
Poyang Lake ◽  
Mixing Model ◽  
Lake Ecosystem ◽  
Food Web Structure ◽  
Bayesian Mixing Model ◽  
Web Structure ◽  
Amino Acid Nitrogen

Reconstructing variability in West Greenland ocean biogeochemistry and bowhead whale (Balaena mysticetus) food web structure using amino acid isotope ratios

Polar Biology ◽  
2017 ◽  
Vol 40 (11) ◽  
pp. 2225-2238 ◽  
Author(s):  
Corinne Pomerleau ◽  
Mads Peter Heide-Jørgensen ◽  
Steven H. Ferguson ◽  
Harry L. Stern ◽  
Jacob L. Høyer ◽  
...  
Keyword(s):  
Amino Acid ◽  
Food Web ◽  
Isotope Ratios ◽  
Bowhead Whale ◽  
Balaena Mysticetus ◽  
Food Web Structure ◽  
West Greenland ◽  
Web Structure ◽  
Ocean Biogeochemistry

Food Web Structure in a Subtropical Lake Ecosystem

Oikos ◽  
1996 ◽  
Vol 75 (1) ◽  
pp. 20 ◽  
Author(s):  
K. E. Havens ◽  
L. A. Bull ◽  
G. L. Warren ◽  
T. L. Crisman ◽  
E. J. Phlips ◽  
...  
Keyword(s):  
Food Web ◽  
Lake Ecosystem ◽  
Food Web Structure ◽  
Subtropical Lake ◽  
Web Structure

scholarly journals Broad-scale trophic shift in the pelagic North Pacific revealed by an oceanic seabird

2017 ◽  
Vol 284 (1851) ◽  
pp. 20162436 ◽  
Author(s):  
Peggy H. Ostrom ◽  
Anne E. Wiley ◽  
Helen F. James ◽  
Sam Rossman ◽  
William A. Walker ◽  
...  
Keyword(s):  
Amino Acid ◽  
Food Web ◽  
North Pacific ◽  
Food Web Structure ◽  
The North ◽  
Web Structure ◽  
Geographical Scale ◽  
The North Pacific ◽  
Broad Scale ◽  
Millennial Scale

Human-induced ecological change in the open oceans appears to be accelerating. Fisheries, climate change and elevated nutrient inputs are variously blamed, at least in part, for altering oceanic ecosystems. Yet it is challenging to assess the extent of anthropogenic change in the open oceans, where historical records of ecological conditions are sparse, and the geographical scale is immense. We developed millennial-scale amino acid nitrogen isotope records preserved in ancient animal remains to understand changes in food web structure and nutrient regimes in the oceanic realm of the North Pacific Ocean (NPO). Our millennial-scale isotope records of amino acids in bone collagen in a wide-ranging oceanic seabird, the Hawaiian petrel ( Pterodroma sandwichensis ), showed that trophic level declined over time. The amino acid records do not support a broad-scale increase in nitrogen fixation in the North Pacific subtropical gyre, rejecting an earlier interpretation based on bulk and amino acid specific δ 15 N chronologies for Hawaiian deep-sea corals and bulk δ 15 N chronologies for the Hawaiian petrel. Rather, our work suggests that the food web structure in the NPO has shifted at a broad geographical scale, a phenomenon potentially related to industrial fishing.

Invasive rodents have multiple indirect effects on seabird island invertebrate food web structure

2017 ◽  
Vol 27 (4) ◽  
pp. 1190-1198 ◽  
Author(s):  
Joshua J. Thoresen ◽  
David Towns ◽  
Sebastian Leuzinger ◽  
Mel Durrett ◽  
Christa P. H. Mulder ◽  
...  
Keyword(s):  
Food Web ◽  
Indirect Effects ◽  
Food Web Structure ◽  
Web Structure ◽  
Invasive Rodents
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