ORCID Profile
0000-0002-7291-5766
Current Organisations
Universidade Federal de Minas Gerais
,
CSIRO Marine and Atmospheric Research
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Publisher: Springer Science and Business Media LLC
Date: 28-08-2011
Publisher: Elsevier BV
Date: 10-2013
Publisher: Springer Science and Business Media LLC
Date: 07-11-2014
DOI: 10.1007/S00442-014-3131-3
Abstract: Fatty acids are a valuable tool in ecological studies because of the large number of unique structures synthesized. They provide versatile signatures that are being increasingly employed to delineate the transfer of dietary material through marine and terrestrial food webs. The standard procedure for determining fatty acids generally involves lipid extraction followed by methanolysis to produce methyl esters for analysis by gas chromatography. By directly transmethylating ~50 mg wet s les and adding an internal standard it was possible to greatly simplify the analytical methodology to enable rapid throughput of 20-40 fish tissue fatty acid analyses a day including instrumental analysis. This method was verified against the more traditional lipid methods using albacore tuna and great white shark muscle and liver s les, and it was shown to provide an estimate of s le dry mass, total lipid content, and a condition index. When large fatty acid data sets are generated in this way, multidimensional scaling, analysis of similarities, and similarity of percentages analysis can be used to define trophic connections among s les and to quantify them. These routines were used on albacore and skipjack tuna fatty acid data obtained by direct methylation coupled with literature values for krill. There were clear differences in fatty acid profiles among the species as well as spatial differences among albacore tuna s led from different locations.
Publisher: Elsevier BV
Date: 02-2010
DOI: 10.1016/J.MARENVRES.2009.07.006
Abstract: Total mercury (THg) and monomethylmercury (MMHg) concentrations were determined in the tissues of demersal shark (Order Squaliformes and the Families: Scyliorhinidae, Hexanchidae) and chimaera species (Families: Chimaeridae and Rhinochimaeridae) from continental shelf and slope waters off southeast Australia, including embryos, juveniles and adults. The distribution of THg in various tissues (muscle, liver, kidney and skin), examined in ten species, shows higher levels in the muscle tissue (1.49+/-0.47mgkg(-1), ww), which accounted for between 59% and 82% of the total body burden of mercury and in the kidney (0.93+/-0.14mgkg(-1), ww) and liver (0.61+/-0.25mgkg(-1), ww) with lower levels observed in the skin (0.12+/-0.06mgkg(-1), ww). Additional THg determinations were performed in the muscle tissue of five other species allowing geographical and inter-specific comparisons. Speciation analysis demonstrated that more than 90% mercury was bound in muscle tissue as MMHg with higher percentages (>95%) observed in sharks species occupying deeper environments. Species differences were observed. Highest THg levels in the muscle tissue (up to 6.64mgkg(-1) wet weight, ww) were recorded in Proscymnodon plunketi and Centrophorus zeehaani (mean values 4.47+/-1.20 and 3.52+/-0.07mgkg(-1), ww, respectively). Consistent with the ongoing paradigm on mercury bioaccumulation, we systematically observed THg concentrations increasing with animal size from the embryos to the larger sharks. Embryos of Etmopterus baxteri and Centroselachus crepidater had average levels 0.28 and 0.06mgkg(-1) (ww), while adult specimens reached 3.3 and 2.3mgkg(-1) (ww), respectively. THg concentrations in Australian sharks were compared with the same genus collected in other world regions. Levels were closer to data reported for East Atlantic than for the epicontinental Mediterranean margins. At a smaller geographical scale, the habitat effect on mercury concentration in sharks seems less clear. Squalid sharks occupying shelf waters showed higher mean mercury levels relative to their size (body weight, bw) than mid-slope species (0.4-6.7mgkg(-1) bw and 0.3-2.2mgkg(-1) bw, respectively). However, local regional differences (East and South Tasmania vs. Victoria) in Hg levels were not detected for the majority of taxa examined. All species, with the exception of Figaro boardmani showed values greater than 0.5mgkg(-1) (ww) and all but four were above many international regulatory thresholds (1.0mgkg(-1), ww).
Publisher: Public Library of Science (PLoS)
Date: 28-05-2014
Publisher: Public Library of Science (PLoS)
Date: 02-07-2015
Publisher: National Inquiry Services Center (NISC)
Date: 02-04-2020
Publisher: American Geophysical Union (AGU)
Date: 02-2019
DOI: 10.1029/2018EF000990
Publisher: Wiley
Date: 11-11-2020
DOI: 10.1111/GCB.14858
Abstract: Considerable uncertainty remains over how increasing atmospheric CO
Publisher: Springer Science and Business Media LLC
Date: 21-08-2014
Publisher: Springer Science and Business Media LLC
Date: 28-03-2007
Publisher: Wiley
Date: 05-02-2021
DOI: 10.1002/ECY.3265
Publisher: Elsevier BV
Date: 02-2013
Publisher: IEEE
Date: 05-2015
Publisher: MDPI AG
Date: 06-08-2023
DOI: 10.3390/SU151512039
Abstract: Additional and alternative sustainable food resources are needed as the global human population increases. Marine fishes have long provided essential nutrients, such as omega-3 long-chain (≥C20) polyunsaturated fatty acids (n-3 LC-PUFA), protein, and vitamins to meet human dietary requirements and feed for agricultural production. Many current commercial fish stocks are depleted or fully exploited, but oceanic mesopelagic fishes, particularly the myctophids (lanternfishes), represent a potentially very large and unfished resource. This review analysed the literature on nutritional and biochemical compositions of myctophids as a first step towards understanding the health benefits and risks of consuming them. We found that myctophids have high levels of protein (11–23% wet weight, WW) and variable lipid content (0.5–26% WW). In most species, desirable triacylglycerols or phospholipids dominated over less-desirable wax esters, and most have abundant amounts of health-promoting n-3 LC-PUFA, such as DHA and EPA. Myctophids have low levels of heavy metals and persistent organic pollutants. Most nutritional information is available for species from the Pacific and Southern Oceans and for the genera Benthosema, Electrona, and Diaphus. Myctophids generally possess favourable nutritional profiles, but major gaps in knowledge regarding their stock assessment, ecology and the economic viability for their harvest are barriers to developing sustainable fisheries.
Publisher: Wiley
Date: 30-11-2022
DOI: 10.1002/ECY.3888
Abstract: Lipid and fatty acid datasets are commonly used to assess the nutritional composition of organisms, trophic ecology, and ecosystem dynamics. Lipids and their fatty acid constituents are essential nutrients to all forms of life because they contribute to biological processes such as energy flow and metabolism. Assessment of total lipids in tissues of organisms provides information on energy allocation and life‐history strategies and can be an indicator of nutritional condition. The analysis of an organism's fatty acids is a widely used technique for assessing nutrient and energy transfer, and dietary interactions in food webs. Although there have been many published regional studies that assessed lipid and fatty acid compositions, many only report the mean values of the most abundant fatty acids. There are limited in idual records available for wider use in intercomparison or macro‐scale studies. This dataset consists of 4856 records of in idual and pooled s les of at least 470 different marine consumer species s led from tropical, temperate, and polar regions around Australia and in the Southern, Indian, and Pacific Oceans from 1989 to 2018. This includes data for a erse range of taxa (zooplankton, fish, cephalopods, chondrichthyans, and marine mammals), size ranges (0.02 cm to ~13 m), and that cover a broad range of trophic positions (2.0–4.6). When known, we provide a record of species name, date of s ling, s ling location, body size, relative (%) measurements of tissue‐specific total lipid content and abundant fatty acids, and absolute content (mg 100 g −1 tissue) of eicosapentaenoic acid (EPA, 20:5n3) and docosahexaenoic acid (DHA, 22:6n3) as important long‐chain (≥C 20 ) polyunsaturated omega‐3 fatty acids. These records form a solid basis for comparative studies that will facilitate a broad understanding of the spatial and temporal distribution of marine lipids globally. The dataset also provides reference data for future dietary assessments of marine predators and model assessments of potential impacts of climate change on the availability of marine lipids and fatty acids. There are 480 data records within our data file for which the providers have requested that permission for reuse be granted, with the likely condition that they are included as a coauthor on the reporting of the dataset. Records with this condition are indicated by a “yes” under “Conditions_of_data_use” in Data S1: Marineconsumer_FAdata.csv (see Table 2 in Metadata S1 for more details). For all other data records marked as “No” under “Conditions_of_data_use,” there are no copyright restrictions for research and/or teaching purposes. We request that users acknowledge use of the data in publications, research proposals, websites, and other outlets via formal citation of this work and original data sources as applicable.
Publisher: Elsevier BV
Date: 12-2011
Publisher: CSIRO Publishing
Date: 2010
DOI: 10.1071/MF09237
Abstract: Total mercury (Hg) concentrations and lipid composition data, including fatty acid profiles, for 61 mid‐trophic species (fish, cephalopods, crustaceans) collected from continental slope waters off south‐east Australia were examined. Overall, Hg concentrations were greatest in fish (0.01–0.30 μg g–1 ww) (with highest content found in barracouta (Thyrsites atun) and whiptails (Coelorinchus fasciatus)), compared with cephalopods (0.01 and 0.17 μg g–1 ww) and crustaceans ( .04 μg g–1 ww). Lipid composition varied between species and within habitat (mesopelagic, bathypelagic and benthic). Mean total lipid content ranged from 0.5 to 13.2% ww, and in most species was dominated by triacylglycerols and phospholipids. In fish and squid, fatty acids were generally dominated by monounsaturated fatty acids, whereas crustaceans were higher in polyunsaturated fatty acids. Multidimensional scaling analyses separated species into groupings according to their fatty acid composition that could be interpreted with taxonomic, trophic and habitat information. Discriminant function analyses indicated the most influential (predictor) fatty acids for each group. Biochemical profile classifications can be used in wider trophodynamic studies to understand contaminant transfer, trophic relationships and community dynamics in marine environments.
Publisher: Elsevier BV
Date: 09-2022
DOI: 10.1016/J.ENVPOL.2022.119751
Abstract: The silky shark Carcharhinus falciformis is a large pelagic species distributed in the global oceans and was recently listed as "Vulnerable" by the IUCN because of its decline in population due to overfishing. As an apex predator, the silky shark can accumulate elevated quantities of mercury (Hg), posing a potential risk to its remaining population. In this study, total Hg (THg) concentrations were determined in silky shark muscle, liver, dermis, red blood cells (RBC) and plasma s led from the eastern tropical Pacific, and δ
Publisher: Elsevier BV
Date: 11-2019
Publisher: Wiley
Date: 30-08-2018
DOI: 10.1111/GEB.12763
Publisher: Inter-Research Science Center
Date: 11-04-2012
DOI: 10.3354/MEPS09593
Publisher: Wiley
Date: 21-04-2019
Publisher: Cambridge University Press (CUP)
Date: 03-08-2011
DOI: 10.1017/S0025315411000841
Abstract: This study details the feeding ecology of arrow squid, Nototodarus gouldi , collected opportunistically from trawlers in waters south-east off Australia in 2007 and 2008. Combined stomach content and fatty acid (FA) signature analyses provided clear evidence of seasonal dietary shifts in prey composition. Teleost fish remains (mainly otoliths) were found in 67% of stomachs with the two mesopelagic planktivorous fish, L anyctodes hectoris and Maurolicus muelleri dominating. Cephalopods and crustaceans were supplementary dietary components, with an increased representation in the diet over winter. Digestive gland lipid content was moderate (16.4 ± 8.4% wet weight) and was rich in triacylglycerol and monounsaturated fatty acids. Multivariate analysis of FA profiles grouped arrow squid with profiles of mesopelagic fish and cephalopods, thus supporting the findings of stomach content analysis. Seasonal differences in total lipid content were likely related to summer upwelling events and local changes in productivity, while intraspecific differences in lipid class and FA composition were related to seasonal differences of prey consumption. FA analyses also demonstrated dietary differences associated with gender, size and female maturation. Such relationships demonstrate that the diet of N. gouldi is closely linked to prey size, abundance and availability and possibly also, to key life-history stages.
Publisher: Springer Science and Business Media LLC
Date: 24-03-2010
Publisher: Inter-Research Science Center
Date: 09-10-2014
DOI: 10.3354/MEPS10864
Publisher: Elsevier BV
Date: 03-2015
Publisher: Elsevier BV
Date: 05-2015
Publisher: Elsevier BV
Date: 03-2015
No related grants have been discovered for Heidi Pethybridge.