Tissue, ontogenic and sex-related differences in δ13C and δ15N values of the oceanic squid Todarodes filippovae (Cephalopoda: Ommastrephidae)

Cherel, Yves; Fontaine, Camille; Jackson, George D.; Jackson, Christine H.; Richard, Pierre

doi:10.1007/s00227-008-1121-x

Cited by 77 publications

(69 citation statements)

References 37 publications

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“…That between-species differences in d 15 N were independent of body size is consistent with previous studies on fishes and contradicts species size-based trophic structuring in communities (Layman et al 2005). This does not preclude a structuring effect of size within species, however, as the nitrogen signature of cephalopod beaks increase during ontogeny (Cherel et al 2009 (Das et al 2000(Das et al , 2003 shed a new light on the trophic structure of the oceanic ecosystem. The nitrogen signature of T. danae is close to that of the sperm whale, indicating that the species has a trophic position similar to that of some top marine consumers.…”

Section: Discussionmentioning

confidence: 99%

Stable isotopes document the trophic structure of a deep-sea cephalopod assemblage including giant octopod and giant squid

et al. 2009

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Although deep-sea cephalopods are key marine organims, their feeding ecology remains essentially unknown. Here, we report for the first time the trophic structure of an assemblage of these animals (19 species) by measuring the isotopic signature of wings of their lower beaks, which accumulated in stomachs of stranded sperm whales. Overall, the species encompassed a narrow range in δ 13 C values (1.7‰), indicating that they lived in closely related and overlapping habitats. δ 13 C values can be interpreted in terms of distribution with the more 13 C-depleted species (e.g. Stigmatoteuthis arcturi , Vampyroteuthis infernalis ) having a more pelagic habitat than the more 13 C-enriched, bathyal species (e.g. Todarodes sagittatus and the giant squid Architeuthis dux ). The cephalopods sampled had δ 15 N values ranging 4.6‰, which is consistent with the species spanning approximately 1.5 trophic levels. Neither the giant octopod ( Haliphron atlanticus ) nor the giant squid reached the highest trophic position. Species δ 15 N was independent of body size, with large squids having both the highest ( Taningia danae ) and lowest ( Lepidoteuthis grimaldii ) δ 15 N values. Their trophic position indicates that some species share the top of the food web, together with other megacarnivores such as the sperm whale.

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Section: Discussionmentioning

confidence: 99%

Stable isotopes document the trophic structure of a deep-sea cephalopod assemblage including giant octopod and giant squid

et al. 2009

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“…Stable isotopes of carbon and nitrogen appear to offer great possibilities for describing the trophic ecology of species at the community scale (resource partitioning, trophic segregation), as well as changes of dietary habits during ontogenesis (Cherel & Hobson 2005, Zimmer et al 2007, Parry 2008, Cherel et al 2009. Also, if information derived from isotopic signatures often need to be validated by available data on diet (e.g.…”

Section: Implication For the Use Of Stable Isotopes Hg And CD As Ecomentioning

confidence: 99%

“…Stable isotopes of carbon and nitrogen were analyzed in the mantle muscle, which is the tissue of reference in food web studies inferred from stable isotope analyses (Hobson & Welch 1992, Pinnegar & Polunin 1999. The use of mantle muscle allows comparisons of isotopic signatures between individuals and taxa, minimizing inter-tissue differences in terms of biochemical and physiological properties like protein turnover rate and metabolic routing (Cherel et al 2009). Because lipids are highly depleted in 13 C relative to other tissue components (De Niro & Epstein 1977), they were extracted from muscle samples using cyclohexane.…”

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confidence: 99%

Inter-specific and ontogenic differences in δ13C and δ15N values and Hg and Cd concentrations in cephalopods

Chouvelon¹,

Spitz²,

Cherel³

et al. 2011

Mar. Ecol. Prog. Ser.

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Chemical tracers (e.g. stable isotopes or trace metals) are increasingly used to study trophic ecology and feeding habits of marine organisms and various factors can affect their values. The aim of the present study was to provide information on ontogenic effects on stable carbon and nitrogen values (δ N values and muscle Hg, and digestive gland Cd concentrations. Results showed that stable isotope ratios allowed discrimination of specific feeding strategies during ontogenesis. Segregation between 5 cephalopod species in terms of trophic ecology was also evidenced (different isotopic niches). In contrast, Hg concentrations varied over the same order of magnitude in these 5 cephalopod species, despite higher levels in the benthic octopus Eledone cirrhosa. Consistently, Hg concentrations followed the same ontogenic pattern and increased with increasing body size/age of cephalopods. Finally, Cd concentrations varied over 3 orders of magnitude among the 5 species. Despite possible effects of physiology in terms of metal bioaccumulation, Cd concentrations were likely to reflect specific feeding preferences or feeding zones and ontogenic variability within a single species. Thus, ontogenic effects have to be taken into account when stable isotope ratios of carbon and nitrogen or trace metals are used as ecological tracers; the best recommendation being to focus on a given class age.

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“…This squid feeds higher in the food chain as it grows and is able to feed on progressively larger prey. Thus, ontogenetic variation has a potentially marked impact on δ 15 N values in histioteuthids as it does in other species of ommastrephids and onychoteuthids (Cherel & Hobson 2005, Cherel et al 2009a, Lorrain et al 2011.…”

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confidence: 99%

Habitat and trophic ecology of Southern Ocean cephalopods from stable isotope analyses

Guerreiro¹,

Phillips²,

Cherel³

et al. 2015

Mar. Ecol. Prog. Ser.

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Although cephalopods play a critical role in marine food webs both as predators and prey, there is a limited knowledge of several basic aspects of their ecology, including their habitat and trophic level, in the Southern Ocean. We examined the ecological role of several Southern Ocean cephalopod species by analyzing δ N values were more variable among species, ranging from 2.4 to 13.3 ‰, a difference of ~11 ‰ that represents approx. 3 trophic levels. Differences among islands in isotope ratios in the same cephalopod species (higher δ 15 N and lower δ 13 C values in South Georgia) were attributed to regional oceanographic processes. Antarctic cephalopods occupy niches similar to those found in some pelagic fish, seabirds and marine mammals. As cephalopods are key components in Southern Ocean food webs, these results greatly advance our understanding of the structure, energy and carbon flows in this polar ecosystem.

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Tissue, ontogenic and sex-related differences in δ13C and δ15N values of the oceanic squid Todarodes filippovae (Cephalopoda: Ommastrephidae)

Cited by 77 publications

References 37 publications

Stable isotopes document the trophic structure of a deep-sea cephalopod assemblage including giant octopod and giant squid

Stable isotopes document the trophic structure of a deep-sea cephalopod assemblage including giant octopod and giant squid

Inter-specific and ontogenic differences in δ13C and δ15N values and Hg and Cd concentrations in cephalopods

Habitat and trophic ecology of Southern Ocean cephalopods from stable isotope analyses

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