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

Published on Mar 29, 2017
· DOI :10.1098/rspb.2016.2436
Peggy H. Ostrom34
Estimated H-index: 34
(MSU: Michigan State University),
Anne E. Wiley7
Estimated H-index: 7
(University of Akron)
+ 4 AuthorsYoshito Chikaraishi32
Estimated H-index: 32
(Hokkaido University)
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Abstract
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 ec...
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  • References (40)
  • Citations (15)
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References40
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The increasing use of trophic position (TP) for assessing and describing ecosystems has resulted in the emergence of novel techniques for accurate and accessible measurements. The strength of amino acid compound specific nitrogen isotopic analysis (AA-CSIA) lies in its ability to determine TP using a single organism, utilizing the isotopic differences between two or more amino acids (AAs). However, calculating TP from this technique relies upon the predictability of isotopic differences across c...
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Analysis of individual amino acid (AA) δ15N values is increasingly common in studies of food web architecture, movement ecology, and biogeochemical cycling. However, observations that nitrogen isotope fractionation of AAs may vary across species and trophic positions (TP) complicate the application of compound-specific stable isotope analysis (CSIA) in studies of aquatic food webs. We reared a common estuarine fish (Fundulus heteroclitus) on four diets to test the hypothesis that diet compositio...
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Stable nitrogen isotopic composition of amino acids (δ15NAA) has recently been employed as a powerful tool in ecological food web studies, particularly for estimating the trophic position (TP) of animal species in food webs. However, the validity of these estimates depends on the consistency of the trophic discrimination factor (TDF; = Δδ15NAA at each shift of trophic level) among a suite of amino acids within the tissues of consumer species. In this study, we determined the TDF values of amino ...
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Estimating trophic structures is a common approach used to retrieve information regarding energy pathways, predation, and competition in complex ecosystems. The application of amino acid (AA) compound-specific nitrogen (N) isotope analysis (CSIA) is a relatively new method used to estimate trophic position (TP) and feeding relationships in diverse organisms. Here, we conducted the first meta-analysis of δ15N AA values from measurements of 359 marine species covering four trophic levels, and comp...
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BACKGROUND: Comparing patterns of ter- restrial and marine defaunation helps to place human impacts on marine fauna in context and to navigate toward recovery. De- faunation began in ear- nest tens of thousands of years later in the oceans than it did on land. Al- though defaunation has been less severe in the oceans than on land, our effects on marine animals are increasing in pace and impact. Humans have caused few complete extinctions in the sea, but we are responsible for many ecological, co...
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The recent increase in anthropogenic emissions of reactive nitrogen from northeastern Asia and the subsequent enhanced deposition over the extensive regions of the North Pacific Ocean (NPO) have led to a detectable increase in the nitrate (N) concentration of the upper ocean. The rate of increase of excess N relative to phosphate (P) was found to be highest (∼0.24 micromoles per kilogram per year) in the vicinity of the Asian source continent, with rates decreasing eastward across the NPO, consi...
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#1Owen A. SherwoodH-Index: 20
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Despite a reduction in nutrient supply to the North Pacific subtropical gyre, it has undergone a recent increase in nitrogen fixation, and here records of nitrogen isotopes preserved in Hawaiian corals show that this is a trend that could be linked to climate change since the end of the Little Ice Age.
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