Fatty acid signatures and stomach contents of four sympatric Lake Trout: assessment of trophic patterns among morphotypes in Great Bear Lake

2014 ◽  
Vol 25 (1) ◽  
pp. 109-124 ◽  
Author(s):  
Louise Chavarie ◽  
Kimberly Howland ◽  
Colin Gallagher ◽  
William Tonn
Keyword(s):  
Fatty Acid ◽  
Lake Trout ◽  
Stomach Contents ◽  
Bear Lake

scholarly journals Dietary versus nondietary fatty acid profiles of lake trout ecotypes from Lake Superior and Great Bear Lake: Are fish really what they eat?

2020 ◽  
Vol 77 (7) ◽  
pp. 1209-1220
Author(s):  
L. Chavarie ◽  
J. Hoffmann ◽  
A.M. Muir ◽  
C.C. Krueger ◽  
C.R. Bronte ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Trophic Ecology ◽  
Lake Trout ◽  
Dietary Fatty Acids ◽  
Intraspecific Diversity ◽  
Dietary Biomarkers ◽  
Bear Lake ◽  
Energy Processing ◽  
Fatty Acid Biomarkers

Fatty acids are well-established biomarkers used to characterize trophic ecology, food-web linkages, and the ecological niche of many different taxa. Most often, fatty acids that are examined include only those previously identified as “dietary” or “extended dietary” biomarkers. Fatty acids considered as nondietary biomarkers, however, represent numerous fatty acids that can be extracted. Some studies may include nondietary fatty acids (i.e., combined with dietary fatty acids), but do not specifically assess them, whereas in other studies, these data are discarded. In this study, we explored whether nondietary biomarker fatty acids can provide worthwhile information by assessing their ability to discriminate intraspecific diversity within and between lakes. Nondietary fatty acids used as biomarkers delineated variation among regions, among locations within a lake, and among ecotypes within a species. Physiological differences that arise from differences in energy processing can be adaptive and linked to habitat use by a species’ ecotype and likely explains why nondietary fatty acid biomarkers can be a relevant tool to delineate intraspecific diversity. Little is known about the nondietary-mediated differences in fatty acid composition, but our results showed that nondietary fatty acid biomarkers can be useful tool in identifying variation.

Spatial variability of lake trout diets in Lakes Huron and Michigan revealed by stomach content and fatty acid profiles

2018 ◽  
Vol 75 (1) ◽  
pp. 95-105 ◽  
Author(s):  
Austin Happel ◽  
Jory L. Jonas ◽  
Paul R. McKenna ◽  
Jacques Rinchard ◽  
Ji Xiang He ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Great Lakes ◽  
Lake Michigan ◽  
Lake Trout ◽  
Stomach Contents ◽  
Neogobius Melanostomus ◽  
Lake Huron ◽  
Fatty Acid Profiles ◽  
Rainbow Smelt ◽  
Western Lake

Despite long-term efforts to restore lake trout (Salvelinus namaycush) populations in the Great Lakes, they continue to experience insufficient recruitment and rely on hatchery programs to sustain stocks. As lake trout reproductive success has been linked to diets, spatial heterogeneity in diet compositions is of interest. To assess spatial components of adult lake trout diets, we analyzed stomach contents and fatty acid profiles of dorsal muscle collected throughout Lake Michigan and along Lake Huron’s Michigan shoreline. Lake trout from Lake Huron were generally larger in both length and mass than those from Lake Michigan. However, lake trout from Lake Michigan varied more in size based on depth of capture with smaller fish being caught more in deeper set nets. Fatty acids and stomach contents indicated that alewife (Alosa pseudoharengus) were consumed more in western Lake Michigan in contrast with round goby (Neogobius melanostomus) along the eastern shoreline. Conversely, in Lake Huron, lake trout primarily consumed rainbow smelt (Osmerus mordax). These results indicate that diet compositions of lake trout populations are relatively plastic and offer new insights into within-basin heterogeneity of Great Lakes food webs.

scholarly journals Dietary vs non-dietary fatty acid profiles of lake trout ecotypes from Lake Superior and Great Bear Lake: Are fish really what they eat?

2019 ◽  
Author(s):  
L Chavarie ◽  
J. Hoffmann ◽  
A.M. Muir ◽  
C.C. Krueger ◽  
C.R. Bronte ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Trophic Ecology ◽  
Lake Trout ◽  
Dietary Fatty Acids ◽  
Intraspecific Diversity ◽  
Fatty Acid Profiles ◽  
Dietary Biomarkers ◽  
Bear Lake ◽  
Energy Processing

AbstractFatty acids are well-established biomarkers used to characterize trophic ecology, food-web linkages, and the ecological niche of many different taxa. Most often, fatty acids that are examined include only those previously identified as “dietary” or “extended dietary” biomarkers. Fatty acids considered as non-dietary biomarkers, however, represent numerous fatty acids that can be extracted. Some studies may include non-dietary fatty acids (i.e., combined with dietary fatty acids), but do not specifically assess them, whereas in other studies, these data are discarded. In this study, we explored whether non-dietary biomarkers fatty acids can provide worthwhile information by assessing their ability to discriminate intraspecific diversity within and between lakes. Non-dietary fatty acids used as biomarkers delineated variation among regions, among locations within a lake, and among ecotypes within a species. Physiological differences that arise from differences in energy processing can be adaptive and linked to habitat use by a species’ ecotypes, and likely explains why non-dietary fatty acids biomarkers can be a relevant tool to delineate intraspecific diversity. Little is known about the non-dietary-mediated differences in fatty acid composition, but our results showed that non-dietary fatty acids biomarkers can be useful tool in identifying variation.

scholarly journals Temporal variations in the diet of the squid Moroteuthis ingens at Macquarie Island: stomach contents and fatty acid analyses

2003 ◽  
Vol 256 ◽  
pp. 135-149 ◽  
Author(s):  
KL Phillips ◽  
GD Jackson ◽  
PD Nichols
Keyword(s):  
Fatty Acid ◽  
Stomach Contents ◽  
Temporal Variations ◽  
Macquarie Island

Iron deficiency during pregnancy and lactation modifies the fatty acid composition of the brain of neonatal rats

2019 ◽  
Vol 11 (3) ◽  
pp. 264-272 ◽  
Author(s):  
William D. Rees ◽  
Susan M. Hay ◽  
Helen E. Hayes ◽  
Valerie J. Stevens ◽  
Lorraine Gambling ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Iron Deficiency ◽  
Polyunsaturated Fatty Acids ◽  
Acid Composition ◽  
Stomach Contents ◽  
Female Rats ◽  
Neonatal Brain ◽  
Iron Deficient

AbstractIron deficiency is common in pregnant and lactating women and is associated with reduced cognitive development of the offspring. Since iron affects lipid metabolism, the availability of fatty acids, particularly the polyunsaturated fatty acids required for early neural development, was investigated in the offspring of female rats fed iron-deficient diets during gestation and lactation. Subsequent to the dams giving birth, one group of iron-deficient dams was recuperated by feeding an iron-replete diet. Dams and neonates were killed on postnatal days 1, 3 and 10, and the fatty acid composition of brain and stomach contents was assessed by gas chromatography. Changes in the fatty acid profile on day 3 became more pronounced on day 10 with a decrease in the proportion of saturated fatty acids and a compensatory increase in monounsaturated fatty acids. Long-chain polyunsaturated fatty acids in the n-6 family were reduced, but there was no change in the n-3 family. The fatty acid profiles of neonatal brain and stomach contents were similar, suggesting that the change in milk composition may be related to the changes in the neonatal brain. When the dams were fed an iron-sufficient diet at birth, the effects of iron deficiency on the fatty acid composition of lipids in both dam’s milk and neonates’ brains were reduced. This study showed an interaction between maternal iron status and fatty acid composition of the offspring’s brain and suggests that these effects can be reduced by iron repletion of the dam’s diet at birth.

Spatio-temporal variability in fatty acid trophic biomarkers in stomach contents and muscle of Iberian sardine (Sardina pilchardus) and its relationship with spawning

2008 ◽  
Vol 154 (6) ◽  
pp. 1053-1065 ◽  
Author(s):  
Susana Garrido ◽  
Rui Rosa ◽  
Radhouan Ben-Hamadou ◽  
Maria Emilia Cunha ◽  
Maria Alexandra Chícharo ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Temporal Variability ◽  
Stomach Contents ◽  
Sardina Pilchardus ◽  
Spatio Temporal

Dietary variation of the squid Moroteuthis ingens at four sites in the Southern Ocean: stomach contents, lipid and fatty acid profiles

2003 ◽  
Vol 83 (3) ◽  
pp. 523-534 ◽  
Author(s):  
Katrina L. Phillips ◽  
Peter D. Nichols ◽  
George D. Jackson
Keyword(s):  
Fatty Acid ◽  
New Zealand ◽  
Southern Ocean ◽  
Stomach Contents ◽  
Total Lipid Content ◽  
Falkland Islands ◽  
Fatty Acid Profiles ◽  
Relative Proximity ◽  
Myctophid Fish ◽  
Dietary Variation

Specimens of the onychoteuthid squid Moroteuthis ingens were collected from four sites in the Southern Ocean: Macquarie Island, the Falkland Islands, the Chatham Rise (New Zealand) and the Campbell Plateau (New Zealand). Spatial variations in diet among these areas were investigated using stomach contents and lipid and fatty acid profiles. Myctophid fish were prominent prey items at all sites, and the diet at New Zealand sites contained temperate myctophid species that were not identified at other sites. The diet at the Falkland Islands differed considerably from other sites due to the large proportion of cephalopod prey that had been consumed by M. ingens. This is likely to be due to the absence of key myctophids, such as Electrona carlsbergi, and the abundance of smaller squid such as Loligo gahi and juvenile M. ingens over the Patagonian Shelf. Stomach contents data could not be used effectively to determine dietary differences between the Chatham Rise and Campbell Plateau, largely due to differences in sample sizes between these sites. Lipid class and fatty acid profiles of the digestive gland indicated that the diet of M. ingens differed significantly between the Chatham Rise and Campbell Plateau, despite the relative proximity of these sites. We conclude from total lipid content that this was due to a reduction in food availability to M. ingens at the Campbell Plateau. The highly productive waters of the Subtropical Front pass over the Chatham Rise, whereas the Campbell Plateau is situated in less productive sub-Antarctic water. Differences in oceanographic conditions are likely to have driven dietary variations between these two sites.

Fatty acid profiles of lake trout reveal the importance of lipid content for interpreting trophic relationships within and across lakes

2020 ◽  
Vol 46 (1) ◽  
pp. 188-197 ◽  
Author(s):  
Austin Happel ◽  
Craig P. Stafford ◽  
Jacques Rinchard ◽  
Sergiusz Czesny
Keyword(s):  
Fatty Acid ◽  
Lipid Content ◽  
Lake Trout ◽  
Trophic Relationships ◽  
Fatty Acid Profiles

Life-history variation among four shallow-water morphotypes of lake trout from Great Bear Lake, Canada

2016 ◽  
Vol 42 (2) ◽  
pp. 193-203 ◽  
Author(s):  
Louise Chavarie ◽  
Kimberly Howland ◽  
Paul Venturelli ◽  
Benjamin C. Kissinger ◽  
Ross Tallman ◽  
...  
Keyword(s):  
Life History ◽  
Shallow Water ◽  
Lake Trout ◽  
Life History Variation ◽  
Bear Lake

Seasonal and Local Variations in Odd-Chain Fatty Acid Levels in Nova Scotian Rainbow Smelt (Osmerus mordax)

1973 ◽  
Vol 30 (1) ◽  
pp. 113-115 ◽  
Author(s):  
R. F. Addison ◽  
R. G. Ackman ◽  
J. Hingley
Keyword(s):  
Fatty Acids ◽  
Seasonal Variation ◽  
Fatty Acid ◽  
Stomach Contents ◽  
Chain Fatty Acid ◽  
Osmerus Mordax ◽  
Rainbow Smelt ◽  
Total Fatty Acids ◽  
Nova Scotian

Odd-chain fatty acid (OCFA) levels in rainbow smelt (Osmerus mordax) from Jeddore Harbour, N.S., showed a pronounced seasonal variation during the period from spring 1969 to fall 1970, reaching a maximum of 20% total fatty acids in the January–March period, and falling to a minimum of approximately 2% total fatty acids in summer and fall. The variation appeared to be general, and occurred in all OCFAs. Analysis of smelt stomach contents suggested that OCFAs originated in the diet. Smelt caught in inlets adjacent to Jeddore Harbour showed no unusual accumulation of OCFAs in January, 1970.

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