scholarly journals European lobsters utilise Atlantic salmon wastes in coastal integrated multi-trophic aquaculture systems

2020 ◽  
Vol 12 ◽  
pp. 485-494
Author(s):  
A Baltadakis ◽  
J Casserly ◽  
L Falconer ◽  
M Sprague ◽  
TC Telfer
Keyword(s):  
Stable Isotope ◽  
Atlantic Salmon ◽  
Stable Isotope Analysis ◽  
Isotope Analysis ◽  
Flow Analysis ◽  
Control Site ◽  
Fish Feed ◽  
Fatty Acid Profiling ◽  
Significant Difference ◽  
Fouling Organisms

In this study, we investigated if juvenile European lobsters Homarus gammarus would eat waste from Atlantic salmon Salmo salar cages in a coastal integrated multi-trophic aquaculture (IMTA) setup and if there were any impacts on growth. Trophic interactions between salmon and lobsters were assessed using δ15N and δ13C stable isotope analysis and fatty acid profiling from fish feed as indicators of nutrient flow. Analysis revealed that lobsters directly utilised particulate waste from salmon production, as levels of indicator fatty acids from salmon feed were significantly higher in lobster tissues near the fish cages compared to the control site. Route of uptake may have been direct consumption of waste feed or faecal material or indirectly through fouling organisms. Stable isotope analysis did not indicate nutrient transfer to lobsters, suggesting that the duration of the study and/or the amount of waste consumed was not sufficient for stable isotope analysis. Lobsters grew significantly over the trial period at both sites, but there was no significant difference in lobster growth between the sites. Our results show a trophic relationship between salmon and lobsters within this IMTA system, with no apparent advantage or disadvantage to growth.

Use of epidermal mucus in elasmobranch stable isotope studies: a pilot study using the giant manta ray (Manta birostris)

2018 ◽  
Vol 69 (2) ◽  
pp. 336 ◽  
Author(s):  
K. B. Burgess ◽  
M. Guerrero ◽  
A. J. Richardson ◽  
M. B. Bennett ◽  
A. D. Marshall
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Time Course ◽  
Feeding Habits ◽  
Isotope Analysis ◽  
Δ13c Values ◽  
Significant Difference ◽  
Manta Birostris ◽  
Epidermal Mucus ◽  
Manta Ray

Stable isotope analysis of tissues with different turnover rates allows for a broader temporal view of a species’ feeding habits. Epidermal mucus is a rapid to medium turnover ‘tissue’ in teleost fish, but its use in elasmobranch dietary studies is unknown. In the present study, we conducted stable isotope analysis on mucus and muscle from the giant manta ray Manta birostris. Mucus δ13C values were depleted and closer to surface zooplankton δ13C values compared with muscle, whereas there was no significant difference in δ15N values between these two tissue types. Using diet tissue discrimination factors from the literature, there was no significant difference in the expected prey profile between muscle and epidermal mucus. However, a broader range in δ13C values of expected prey was shown for mucus compared with muscle. The results suggest that if M. birostris mucus is indicative of recent dietary intake, resource use during aggregative behaviour off Ecuador is broader, but with no obvious resource switching. The present study is the first example of using bulk stable isotope analysis to evaluate mucus to investigate feeding ecology in elasmobranchs. However, the time course for the change in mucus isotope signature still needs to be determined through controlled feeding studies in an aquarium setting.

scholarly journals Stable isotope analysis of marine feeding signatures of Atlantic salmon in the North Atlantic

2009 ◽  
Vol 67 (1) ◽  
pp. 52-61 ◽  
Author(s):  
J. Brian Dempson ◽  
Victoria A. Braithwaite ◽  
Denis Doherty ◽  
Michael Power
Keyword(s):  
Stable Isotope ◽  
Atlantic Salmon ◽  
Stable Isotope Analysis ◽  
North Atlantic ◽  
C:N Ratio ◽  
Isotope Analysis ◽  
Unknown Origin ◽  
Δ13c And Δ15n ◽  
The North ◽  
The North Atlantic

Abstract Dempson, J. B., Braithwaite, V. A., Doherty, D., and Power, M. 2010. Stable isotope analysis of marine feeding signatures of Atlantic salmon in the North Atlantic. – ICES Journal of Marine Science, 67: 52–61. Differences in the marine feeding of three geographically distinct populations of Atlantic salmon (Salmo salar) in the North Atlantic (Conne River, Newfoundland; Koksoak River, Ungava Bay, Québec; River Erne, northwest Ireland) were examined using analyses of stable isotopes of carbon and nitrogen (δ13C and δ15N) and contrasted with isotope signatures obtained from a sample of salmon of unknown origin captured in the Labrador Sea. Although the overall range of δ13C and δ15N values (δ13C: from −22.42 to −19.37; δ15N: from 10.70 to 13.38) was similar to that reported by others, significant differences were found among populations and between different sea-age life-history groups. Reported differences in marine feeding between populations from the Northeast and Northwest Atlantic corroborated the stable isotope results. A surrogate measure of lipid content, the C:N ratio, was also compared among 1-sea-winter salmon. The highest levels were associated with the Koksoak River, suggesting that Subarctic populations may require higher energy reserves to contend with their longer migrations and more-severe environmental conditions.

scholarly journals The influence of food quantity on carbon and nitrogen stable isotope values in southern African spiny mice (Acomys spinosissimus)

2015 ◽  
Vol 93 (5) ◽  
pp. 345-351 ◽  
Author(s):  
G.N. Robb ◽  
S. Woodborne ◽  
P.R. de Bruin ◽  
K. Medger ◽  
N.C. Bennett
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Lipid Extraction ◽  
C:N Ratio ◽  
Isotope Analysis ◽  
Single Species ◽  
Carbon And Nitrogen ◽  
Food Quantity ◽  
Significant Difference ◽  
Influence Of Food

Stable isotope analysis is frequently applied as a tool to examine dietary patterns in animals. However, some of the underlying assumptions associated with using this approach are increasingly being questioned. We carried out a controlled diet experiment on the southern African spiny mouse (Acomys spinosissimus Peters, 1852) to test a number of aspects relating to these assumptions and also examine the hypothesis that stable isotopes, especially δ15N, can be used to provide evidence of nutritional stress. We compared the δ13C and δ15N values of livers and blood from animals that were fed ad libitum with animals undergoing a 10% reduction in food supply. Food-restricted animals showed no significant difference in δ15N; however, δ13C values of both liver and blood were depleted. Restricted animals also had a significantly lower C:N ratio. We examined the role of lipids and found following lipid extraction that both livers and lipids still showed the same separation in carbon values. Tissue–diet discrimination values were also calculated and found to be higher for both Δ13C and Δ15N compared with other mice species. Empirical values for discrimination rates were then compared with values calculated using an alternative method based on employing generic values and were found to be dissimilar, suggesting the use of generic values are not always appropriate. Our results highlight the need for greater understanding of the assumptions associated with using stable isotope analysis to examine diet and we suggest that studying a single species under captive conditions presents an ideal method to begin to test these hypotheses.

Trophic niche differentiation mirrors intra-island population structure of Galápagos marine iguanas (Amblyrhynchus cristatus)

2019 ◽  
Author(s):  
Sten Anslan ◽  
Timm Reinhardt ◽  
Patrick Fink ◽  
Mario Brauns ◽  
Nicolás Peñafiel ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Genetic Differentiation ◽  
Stable Isotope Analysis ◽  
Isotope Analysis ◽  
Trophic Niche ◽  
Ecological Niches ◽  
Amblyrhynchus Cristatus ◽  
Significant Difference ◽  
Marine Iguanas ◽  
Marine Iguana

Abstract Background: Differences in the trophic niche often underlie ecological specialization of individuals and can promote ecological speciation of populations, but studies showing a link between differences in the trophic niche and genetic differentiation of populations are rare. On the island of San Cristóbal (Galapágos archipelago), a strong genetic differentiation between two relatively proximate populations (subspecies; Amblyrhynchus cristatus mertensi and A. c. godzilla) of marine iguanas along the coastline has been observed. Here, we explore whether this genetic differentiation is mirrored in the iguanas’ trophic niche. Results: Although, no significant difference in the number of consumed algal taxa between subspecies were detected, the Schoener index exhibited low diet overlap between A. c. mertensi and A. c. godzilla. The latter was also demonstrated by the PERMANOVA analysis with significantly different diet OTU composition from the fecal samples between subspecies. Stable isotope analysis revealed that subspecies identity was overall more important than site for the iguanas’ resource use. Conclusions: By applying a metabarcoding approach on feces samples in combination with stable isotope analysis of skin sheds, we found that A. c. mertensi and A. c. godzilla differ in their ecological niches. Moreover, stable isotope analysis indicated that marine iguana populations have low spatial foraging distances, which, together with the diet partitioning patterns, might explain, at least partially, the lack of gene flow between these geographically proximate marine iguana populations. Key words: diet analysis, trophic niche, metabarcoding, stable isotopes, marine iguanas, Amblyrhynchus cristatus

Stable isotope analysis of nutrient pathways leading to Atlantic salmon

1996 ◽  
Vol 53 (9) ◽  
pp. 2058-2066 ◽  
Author(s):  
R R Doucett ◽  
G Power ◽  
D R Barton ◽  
R J Drimmie ◽  
R A Cunjak
Keyword(s):  
Stable Isotope ◽  
Atlantic Salmon ◽  
Stable Isotope Analysis ◽  
Isotope Analysis

Development of an In-Situ Mass Spectrometer for Stable Isotope Analysis

2003 ◽  
Author(s):  
R. T. Short ◽  
Gottfried P. Kibelka ◽  
Robert H. Byrne ◽  
David Hollander
Keyword(s):  
Stable Isotope ◽  
Mass Spectrometer ◽  
Stable Isotope Analysis ◽  
Isotope Analysis

LATE HOLOCENE HYDROCLIMATE RECONSTRUCTION FROM LAKE CHICHOJ, GUATEMALA USING STABLE ISOTOPE ANALYSIS OF SEDIMENTS

2017 ◽  
Author(s):  
Peter Mortensen ◽  
◽  
Nathan D. Stansell ◽  
Byron A. Steinman ◽  
Gilles Y. Brocard ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Late Holocene ◽  
Isotope Analysis
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