Fatty acid signatures and classification trees: new tools for investigating the foraging ecology of seals

Smith, S. J.; Iverson, Sara J.; Bowen, W. Don

doi:10.1139/cjfas-54-6-1377

Cited by 37 publications

(69 citation statements)

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“…FAs) is not limited by sample size (Smith et al 1997, Budge et al 2006. CART uses FAs with the greatest variance to divide the samples into dichotomous groups.…”

Section: Multivariate Statisticsmentioning

confidence: 99%

Fatty acids as dietary tracers in benthic food webs

Kelly¹,

Scheibling²

2012

Mar. Ecol. Prog. Ser.

468

413

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“…FAs) is not limited by sample size (Smith et al 1997, Budge et al 2006. CART uses FAs with the greatest variance to divide the samples into dichotomous groups.…”

Section: Multivariate Statisticsmentioning

confidence: 99%

Fatty acids as dietary tracers in benthic food webs

Kelly¹,

Scheibling²

2012

Mar. Ecol. Prog. Ser.

468

413

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“…However, the concept of specific markers or ratios is of limited value to a study dealing with trophic interactions of higher marine predators or large-scale comparisons. Consequently, various statistical multivariate approaches have been proposed (Grahl-Nielsen & Mjaavatten 1991, Smith et al 1997, Mayzaud et al 1999 to account for the covariation of entire profiles of fatty alcohols and/or fatty acids from both potential prey and predator.…”

Section: Use Of Fatty Alcohol and Fatty Acid Patterns In Trophic Studiesmentioning

confidence: 99%

Lipid composition of stomach oil in a procellariiform seabird Puffinus tenuirostris: implications for food web studies

Connan¹,

Mayzaud²,

Boutoute³

et al. 2005

Mar. Ecol. Prog. Ser.

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Some procellariiform seabirds use a dual strategy for provisioning their chicks by alternating between short and long foraging trips (LT). Trophic relationships of adult birds are unknown when they feed for themselves during LT because digestion processes preclude direct prey determination. Since stomach contents collected after LT contain oil of dietary origin, we tested the use of oil lipids as prey trophic markers using the Tasmanian short-tailed shearwater Puffinus tenuirostris as a model seabird. The intra-specific variability of stomach oils was investigated through lipid class composition, and their fatty acid and fatty alcohol profiles. Oils mainly consisted of wax esters (WE) and triacylglycerols (TAG) (49 to 86 and 7 to 41%, respectively). Major fatty acids of TAG were in a decreasing order 18:1n-9, 16:0, 16:1n-7, 14:0, 20:5n-3 and 22:6n-3. The WE-fatty acid profiles were dominated by 18:1n-9 and 16:1n-7 while fatty alcohol profiles were dominated by 16:0. Fatty alcohol and fatty acid patterns were tested as possible descriptors of ingested prey (derived from literature data) through multivariate discriminant analyses. Comparisons of the WE fatty alcohol patterns showed a close association with the alcohol structure of 3 myctophid fish species namely Krefftichthys anderssoni, Gymnoscopelus braueri and Electrona antarctica; these results were corroborated by WE fatty acid analysis. Comparison of TAG fatty acid patterns showed the highest similarity between oils and the digestive gland of the myctophid-eater squid Moroteuthis ingens in association with the myctophid Electrona carlsbergi. Hence, biochemical analysis of both WE and TAG strongly suggested that adult short-tailed shearwaters mainly prey upon Antarctic/subAntarctic myctophids when they feed for themselves, thus emphasizing the role of these oceanic mesopelagic fish in the marine ecosystem of the Southern Ocean.

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“…Such use is based on studies of the lipid class and fatty acid and fatty alcohol compositional profiles of numerous algal and animal species (Sargent & Whittle 1981), and on the knowledge of the transfer of fatty acids through the food chain from algae to top predators (Falk-Petersen et al 1990, 2000a. More recently, fatty acid profiles have been combined with multivariate statistical techniques to investigate the foraging ecology of marine mammals (Iverson 1997a,b, Grahl-Nielsen & Mjaavatten 1991, Smith et al 1997, Brown et al 1999, Dahl et al 2000, Kirsch et al 2000, Walton et al 2000, birds (Raclot et al 1998) and fish (Kirsch et al 1998). In the present study, we used principal component analysis (PCA) to assist in the interpretation of synthesised fatty acid and fatty alcohol analytical data from Beröe cucumis, Mertensia ovum and copepods in order to illuminate trophic relationships between these species in Svalbard waters.…”

Section: Introductionmentioning

confidence: 99%

Lipid biomarkers and trophic linkages between ctenophores and copepods in Svalbard waters

Falk‐Petersen¹,

Dahl²,

Scott³

et al. 2002

Mar. Ecol. Prog. Ser.

107

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The lipid class compositions of the ctenophores Mertensia ovum and Beröe cucumis were very similar, with polar lipid and wax esters each accounting for 35 to 40% of the total. The fatty acid compositions of the polar lipids in the 2 species were essentially the same, with 22:6n3 and 20:5n3 in a ratio of 2:1 accounting for more than 40% of the total. The fatty acid and fatty alcohol compositions of the wax esters of both species were also essentially the same, with 20:1n9 and 22:1n11 fatty alcohols present in equal amounts accounting for 60% of the total fatty alcohol composition. The fatty acid and fatty alcohol compositions of the wax esters of M. ovum and B. cucumis were averaged and compared, using principal component analyses, to averages derived from published data for the potential prey species: Calanus finmarchicus, C. glacialis, C. hyperboreus, Pseudocalanus acuspes, Acartia longiremis and Metridia longa. The results were consistent with Calanus spp., especially C. glacialis, being the major prey of M. ovum and with M. ovum being the major prey of B. cucumis.

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Fatty acid signatures and classification trees: new tools for investigating the foraging ecology of seals

Cited by 37 publications

References 0 publications

Fatty acids as dietary tracers in benthic food webs

Fatty acids as dietary tracers in benthic food webs

Lipid composition of stomach oil in a procellariiform seabird Puffinus tenuirostris: implications for food web studies

Lipid biomarkers and trophic linkages between ctenophores and copepods in Svalbard waters

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