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.

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

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.

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.

Feeding habits of John Dory, Zeus faber, off the Portuguese continental coast

1999 ◽  
Vol 79 (2) ◽  
pp. 333-340 ◽  
Author(s):  
Alexandra Silva
Keyword(s):  
Prey Species ◽  
Feeding Habits ◽  
Parallel Evolution ◽  
Stomach Contents ◽  
Abundant Species ◽  
Temporal Variations ◽  
Food Composition ◽  
Diet Shift ◽  
Feeding Intensity ◽  
Zeus Faber

The feeding habits of John Dory (Zeus faber) were studied, based on the analysis of stomach contents from fish sampled in five groundfish surveys. These surveys were carried out off the Portuguese coast during different seasons between 1990 and 1992. The main aspects of feeding biology analysed in this paper are: ontogenetic diet changes, temporal variations in food composition and feeding intensity. Multivariate methods were used to investigate ontogenetic diet shifts. Two main length groups were identified: 8.0–24.9 cm fish, feeding mainly on dragonets and silvery pout, and 25.0–55.9 cm fish whose diet was mainly composed of blue whiting and snipefish. A transitional phase (24.0–30.9 cm fish) with a mixed food composition was observed. This ontogenetic diet shift does not seem to correspond to any important change in body morphology but it does coincide with the onset of sexual maturity in the species.John Dory switched from a diet of small prey species with more pronounced benthic behaviour to a diet of larger schooling pelagic species. This suggests parallel evolution to more pelagic foraging behaviour. However, John Dory feeding habits appear to be largely controlled by the availability and accessibility of prey species: (i) the diet of adult John Dory is dominated by very abundant species; (ii) shifts in the main prey items between different times of the year and between different areas seem to be related both with their absolute and relative abundance in the environment and with the overlap between the depth distribution of predator and prey.

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.

The Diet of the Introduced Rodents Mus-Musculus L and Rattus-Rattus L on Sub-Antarctic Macquarie Island

1986 ◽  
Vol 13 (3) ◽  
pp. 441 ◽  
Author(s):  
GR Copson
Keyword(s):  
House Mouse ◽  
Mus Musculus ◽  
Seasonal Variations ◽  
Plant Material ◽  
Rattus Rattus ◽  
Stomach Contents ◽  
Macquarie Island ◽  
Ship Rat

The diets of Mus musculus and Rattus rattus on Macquarie I . were investigated by analysis of stomach contents collected monthly for 12 months. The diet of the house mouse was found to be mainly invertebrate matter but that of the ship rat was mainly plant material. Seasonal variations were found in both diets but were greater in that of the ship rat than that of the house mouse.

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