scholarly journals Detect and exploit hidden structure in fatty acid signature data

Ecosphere ◽  
2017 ◽  
Vol 8 (7) ◽  
pp. e01896 ◽  
Author(s):  
Jeffrey F. Bromaghin ◽  
Suzanne M. Budge ◽  
Gregory W. Thiemann
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Signature

QUANTITATIVE FATTY ACID SIGNATURE ANALYSIS: A NEW METHOD OF ESTIMATING PREDATOR DIETS

2004 ◽  
Vol 74 (2) ◽  
pp. 211-235 ◽  
Author(s):  
Sara J. Iverson ◽  
Chris Field ◽  
W. Don Bowen ◽  
Wade Blanchard
Keyword(s):  
Fatty Acid ◽  
New Method ◽  
Signature Analysis ◽  
Fatty Acid Signature

First evaluation of quantitative fatty acid signature analysis (QFASA) in dolphins

2021 ◽  
pp. 102141
Author(s):  
Quan Xie ◽  
Xi Ning ◽  
Xiaoxiao He ◽  
Lixia Deng ◽  
Zhenger Wu ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Signature Analysis ◽  
Fatty Acid Signature

scholarly journals Review of Estimating Trophic Relationships by Quantitative Fatty Acid Signature Analysis

2020 ◽  
Vol 8 (12) ◽  
pp. 1030
Author(s):  
Junbo Zhang ◽  
Chonglan Ren ◽  
Hu Zhang ◽  
Fang Yin ◽  
Shuo Zhang ◽  
...  
Keyword(s):  
Fatty Acid ◽  
First Generation ◽  
Trophic Relationships ◽  
Research Progress ◽  
Signature Analysis ◽  
Fatty Acid Signature ◽  
Predator Prey ◽  
Quantitative Ecology ◽  
Improper Use

The dynamic predator–prey relations in the food web are vital for understanding the function and structure of ecosystems. Dietary estimation is a research hotspot of quantitative ecology, providing key insights into predator–prey relationships. One of the most promising approaches is quantitative fatty acid signature analysis (QFASA), which is the first generation of statistical tools to estimate the quantitative trophic predator–prey relationships by comparing the fatty acid (FA) signatures among predators and their prey. QFASA has been continuously widely applied, refined and extended since its introduction. This article reviewed the research progress of QFASA from development and application. QFASA reflects the long-term diet of predator, and provides the quantitative dietary composition of predator, but it is sensitive to the metabolism of predator. The calibration coefficients (CCs) and the FA subset are two crucial parameters to explain the metabolism of predators, but the incorrect construction or improper use of CCs and the FA subset may cause bias in dietary estimation. Further study and refinement of the QFASA approach is needed to identify recommendations for which CCs and subsets of FA work best for different taxa and systems.

Variation in the diet of beluga whales in response to changes in prey availability: insights on changes in the Beaufort Sea ecosystem

2020 ◽  
Vol 647 ◽  
pp. 195-210 ◽  
Author(s):  
ES Choy ◽  
C Giraldo ◽  
B Rosenberg ◽  
JD Roth ◽  
AD Ehrman ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Prey Availability ◽  
Beaufort Sea ◽  
Delphinapterus Leucas ◽  
Fatty Acid Signature ◽  
Arctic Cod ◽  
Beluga Whales ◽  
Highly Sensitive ◽  
Condition Indices

The eastern Beaufort Sea (EBS) beluga whale Delphinapterus leucas population has experienced a 20 yr decline in inferred growth rates of individuals, which is hypothesized to have resulted from changes in prey availability. We used fatty acid signatures and stable isotope ratios to reconstruct the proportional contributions of 14 prey species to the diets of 178 beluga whales from 2011 to 2014. Prey estimates using quantitative fatty acid signature analysis suggest that EBS beluga whales primarily consume Arctic cod Boreogadus saida, a species highly sensitive to climate change. Prey estimates varied with year and sex and size class of the whales, with large males consuming the highest proportions of Arctic cod, and females consuming the highest proportions of capelin Mallotus villosus. Estimated proportional contributions of Arctic cod to beluga diet decreased from 2011 to 2014, coinciding with an increase in capelin. Belugas consumed the highest proportions of capelin and the lowest proportions of cod in 2014, the same year in which body condition indices were lowest in the whales. We hypothesize that changing conditions in the Beaufort Sea ecosystem may result in a decreased consumption of Arctic cod by belugas and increased consumption of capelin, which may result in a decline in condition. This may predominately affect females and juveniles since they consume the highest proportions of capelin; however, long-term monitoring is needed for confirmation. Understanding inter-annual variation in prey, and the longer-term nutritional implications of shifting from an Arctic cod- to a capelin-dominated diet should be a priority for monitoring EBS predators.

Lipid dynamics and trophic patterns in Pleuragramma antarctica life stages

2015 ◽  
Vol 27 (5) ◽  
pp. 429-438 ◽  
Author(s):  
Carolina Giraldo ◽  
Patrick Mayzaud ◽  
Eric Tavernier ◽  
Marc Boutoute ◽  
Florian Penot ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Prey Availability ◽  
Ontogenetic Changes ◽  
Fatty Acid Signature ◽  
Lipid Dynamics ◽  
Sampling Locations ◽  
Key Species ◽  
Vertical Segregation ◽  
A Minor ◽  
Minor Extent

AbstractThe aim of this study was to clarify the trophic patterns of the key species Pleuragramma antarctica in the Dumont d’Urville Sea, through its development and possible changes according to sampling locations. Variability in diet composition of larvae, juvenile and adult P. antarctica was analysed using fatty acid markers. Analysis of lipid class in P. antarctica reflected lipid accumulation with increasing size at all sampling stations. The fatty acid composition of triacylglycerol highlighted ontogenetic changes in the diet. Phytoplankton markers, such as C16PUFA:C16 and EPA:DHA ratios >1, and carnivorous markers in larvae suggested an omnivorous diet. Comparison between the fatty acid signature of P. antarctica older stages (juveniles and adults) and zooplankton species using OPLS-discriminant analysis indicated that juveniles fed mainly on euphausiid larvae and to a minor extent on copepods, and confirmed that non-herbivorous copepods were the main prey for adults. Our results suggest that different feeding patterns and a generalist strategy in P. antarctica with juveniles feeding on bigger prey than adults, probably as a result of prey availability according to their vertical segregation pattern.

scholarly journals Distance measures and optimization spaces in quantitative fatty acid signature analysis

2015 ◽  
Vol 5 (6) ◽  
pp. 1249-1262 ◽  
Author(s):  
Jeffrey F. Bromaghin ◽  
Karyn D. Rode ◽  
Suzanne M. Budge ◽  
Gregory W. Thiemann
Keyword(s):  
Fatty Acid ◽  
Distance Measures ◽  
Signature Analysis ◽  
Fatty Acid Signature
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