Isotopic fractionation in wild and captive European spiny lobsters (Palinurus elephas)

Deudero, Salud; Tor, Ariadna; Díaz, David; Mallol, Sandra; Goñi, Raquel

doi:10.1163/193724012x626476

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…14,[17][18][19] Tissues inside the carapace are maintained long term compared to appendages which are frequently lost and regrown in the wild. 26,27 It has been suggested that well-protected tissues found inside the thorax of lobsters, which persist throughout a lobster's lifetime, have a different rate of isotopic turnover than more vulnerable tissues like limbs 31,43 which will likely be lost at some stage while escaping predation, 26,27 and this may partially explain a trend observed in our data. We recorded stable isotope ratios that were identical between different tissues in 24 lobsters (31.6%) for δ 13 C and 10 lobsters (13.2%) for δ 15 N. Another 10 lobsters had similar but non-identical carbon and nitrogen isotope values for all tissues (abdomen, leg and antennae).…”

Section: Discussionsupporting

confidence: 51%

Non‐lethal sampling does not misrepresent trophic level or dietary sources for Sagmariasus verreauxi (eastern rock lobster)

Day

Knott

Swadling

et al. 2022

Rapid Comm Mass Spectrometry

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Isotope analysis can be used to investigate the diets of predators based on assimilation of nitrogen and carbon isotopes from prey. Recent work has shown that tissues taken from legs, antennae or abdomen of lobsters can give different indications of diet, but this has never been evaluated for Sagmariasus verreauxi (eastern rock lobster). Work is now needed to prevent erroneous conclusions being drawn about lobster food webs, and undertaking this work could lead to developing non-lethal sampling methodologies. Non-lethal sampling for lobsters is valuable both ethically and for areas of conservation significance such as marine reserves.Method: We evaluated this by dissecting 76 lobsters and comparing δ 13 C and δ 15 N isotope values in antennae, leg and abdomen tissue from the same individuals ranging from 104 to 137 mm carapace length. Stable isotope values were determined using a Europa EA GSL elemental analyser coupled with Hydra 20-20 Isoprime IRMS.Results: We found the abdomen δ 13 C values to be lower than other tissues by 0.3 ± 0.2‰ for antennae tissue and 0.1 ± 0.2‰ δ 13 C for leg tissues, whereas for δ 15 N, no significant difference between tissues was observed. There was no significant effect of lobster size or sex, though we did observe interactions between month and tissue type, indicating that differences may be seasonal. Importantly, the detected range of isotopic variability between tissues is within the range of uncertainty used for discrimination factors in isotopic Bayesian modelling of 0‰-1.0‰ for δ 13 C and 3.0‰-4.0‰ for δ 15 N. Conclusions:We show that S. verreauxi can be sampled non-lethally with mathematical corrections applied for δ 13 C, whereas any tissue is suitable for δ 15 N. Our results indicate that a walking leg is most favourable and would also be the least intrusive for the lobster. The application of non-lethal sampling provides avenues for the contribution of citizen science to understanding lobster food webs and to undertake fieldwork in ecologically sensitive areas such as marine reserves.

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Section: Discussionsupporting

confidence: 51%

Non‐lethal sampling does not misrepresent trophic level or dietary sources for Sagmariasus verreauxi (eastern rock lobster)

Day

Knott

Swadling

et al. 2022

Rapid Comm Mass Spectrometry

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“…Stable isotopes of carbon and nitrogen have been used widely to assess the flow of nutrients through food webs, and more recently, to trace waste products from aquaculture (Marín Leal et al 2008, Deudero et al 2012. Stable isotopes assimilate within the tissues of consumers, with heavier isotopes, 13 C and 15 N, remaining longer in animal tissues than lighter ones, 12 C and 14 N, which are rapidly utilised during metabolism (Marín Leal et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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

Baltadakis

Casserly

Falconer

et al. 2020

Aquacult. Environ. Interact.

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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.

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Trophic assessment and isotopic niches of the sympatric penaeids species Penaeus brasiliensis and P. paulensis in SW Atlantic estuarine systems

Carvalho

Monteiro

Keunecke

et al. 2021

Marine Biology Research

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Isotopic fractionation in wild and captive European spiny lobsters (Palinurus elephas)

Cited by 4 publications

References 18 publications

Non‐lethal sampling does not misrepresent trophic level or dietary sources for Sagmariasus verreauxi (eastern rock lobster)

Non‐lethal sampling does not misrepresent trophic level or dietary sources for Sagmariasus verreauxi (eastern rock lobster)

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

Trophic assessment and isotopic niches of the sympatric penaeids species Penaeus brasiliensis and P. paulensis in SW Atlantic estuarine systems

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