Applying new tools to cephalopod trophic dynamics and ecology: perspectives from the Southern Ocean Cephalopod Workshop, February 2–3, 2006

Jackson, George D.; Bustamante, Paco; Cherel, Yves; Fulton, Elizabeth A.; Grist, Eric P. M.; Jackson, Christine H.; Nichols, Peter D.; Pethybridge, Heidi; Phillips, Katrina L.; Ward, Robert; Xavier, José C.

doi:10.1007/s11160-007-9055-9

Cited by 54 publications

(29 citation statements)

References 91 publications

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“…fish versus squid, Bradshaw et al 2003), while fish lipid patterns show considerable taxonomic variation (at the species and family levels), thus allowing separation of fishes into functional groups for a better predator-prey analysis (Connan et al 2007a,b). Moreover, due to the importance of prey lipids in the digestive gland of squid (that exceed mantle lipid content by an order of magnitude), it is important to consider the type of squid fatty acid data included in dietary studies of top predators (Jackson et al 2007). When whole squid and/or digestive gland are used to represent potential prey items (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…When whole squid and/or digestive gland are used to represent potential prey items (e.g. Bradshaw et al 2003), the squid lipid profile may be very similar to other prey such as myctophids, thus constraining the use of fatty acids to assess the importance of squid in the diet of predators (Jackson et al 2007). Within that context, it is remarkable that lipid analysis classified elephant seals with squid known to be primarily myctophid eaters (Phillips et al 2002, and that seals had a δ 15 N value not statistically different from that of the mesopelagic fish-eating warty squid (Cherel & Duhamel 2003).…”

Section: Discussionmentioning

confidence: 99%

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Stable isotopes reveal the trophic position and mesopelagic fish diet of female southern elephant seals breeding on the Kerguelen Islands

Cherel¹,

Ducatez²,

Fontaine³

et al. 2008

Mar. Ecol. Prog. Ser.

184

171

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Stable isotopes reveal the trophic position and mesopelagic fish diet of female southern elephant seals breeding on the Kerguelen Islands

Cherel¹,

Ducatez²,

Fontaine³

et al. 2008

Mar. Ecol. Prog. Ser.

184

171

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“…Shipbased scientific surveys in the Southern Ocean encounter similar problems, not helped by the low trawl speeds and use of conventional sampling methods (Clarke 1977, Rodhouse 1990, Rodhouse et al 1996. The available information on diet and trophic relationships is therefore limited largely to 2 common species, Martialia hyadesi and Moroteuthis ingens (Jackson et al 2007), and otherwise biased towards cephalopods that feed on Antarctic krill Euphausia superba, as these are caught in the same nets (Nemoto et al 1985(Nemoto et al , 1988). …”

Section: Introductionmentioning

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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“…To study the feeding ecology of cephalopods, the use of tracers such as stable isotope ratios is particularly suitable (Cherel & Hobson 2005, Ruiz-Cooley et al 2006, Parry 2008, notably because prey identification from the gut is often difficult (Jackson et al 2007). In addition, these voracious predators can accumulate high metal concentrations in their tissues, especially in the digestive gland (Martin & Flegal 1975, Miramand & Bentley 1992.…”

Section: Introductionmentioning

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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Applying new tools to cephalopod trophic dynamics and ecology: perspectives from the Southern Ocean Cephalopod Workshop, February 2–3, 2006

Cited by 54 publications

References 91 publications

Stable isotopes reveal the trophic position and mesopelagic fish diet of female southern elephant seals breeding on the Kerguelen Islands

Stable isotopes reveal the trophic position and mesopelagic fish diet of female southern elephant seals breeding on the Kerguelen Islands

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

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

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