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

Guerreiro, Miguel; Phillips, Richard A.; Cherel, Yves; Ceia, Filipe R.; Alvito, Pedro; Rosa, Rui; Xavier, José C.

doi:10.3354/meps11266

Cited by 52 publications

(46 citation statements)

References 56 publications

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“…The strange behavior of holding jellyfish may suggest complex interactions between 6 Journal of Marine Biology the two types of species, because similar interactions [57] have been observed in other cephalopods. Stable isotope analyses suggest H. atlanticus has an intermediate trophic level compared to other cephalopods [58,59], which could be consistent with feeding on gelatinous zooplankton and other types of prey.…”

Section: Journal Of Marine Biologymentioning

confidence: 72%

Observation of a Gelatinous Octopod, Haliphron atlanticus, along the Southern West Mariana Ridge: A Unique Cephalopod of Continental Slope and Mesopelagic Communities

Miller

Miwa

Watanabe

et al. 2018

Journal of Marine Biology

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The circumglobal deep-sea gelatinous giant octopod, Haliphron atlanticus, reaches 4 m in length and uses both benthic and pelagic habitats in the upper 3000 m of the ocean during different life history stages, but it is rarely observed due to the deep-depths where it typically lives. It has been collected in trawls and observed a few times near continental margins or islands and has been identified in the stomach contents of deep-diving predators such as sperm whales and blue sharks or detected as body fragments after predation events. An individual H. atlanticus (∼1 m in total length) was video-recorded at 12:21 for about 3 minutes in front of the Shinkai 6500 submersible at 586-599 m (6.5 ∘ C, salinity 34.4) along the West Mariana Ridge. It made no escape attempt as the submersible approached and it moved slowly up or down in front of the submersible. It was over the outer seamount-slope (bottom depth ∼3208 m) ∼50 km west of seamounts (≥1529 m summits), but how it fits into the mesopelagic food web along the ridge is unclear. More information is needed to understand the role of H. atlanticus in oceanic food webs and if it typically lives along seamount ridges.

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Section: Journal Of Marine Biologymentioning

confidence: 72%

Observation of a Gelatinous Octopod, Haliphron atlanticus, along the Southern West Mariana Ridge: A Unique Cephalopod of Continental Slope and Mesopelagic Communities

Miller

Miwa

Watanabe

et al. 2018

Journal of Marine Biology

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“…gonatids, histioteuthids), which include small and delicate forms (e.g. chiroteuthids, mastigoteuthids) (Cherel & Hobson 2005, Cherel et al 2008, 2009b, Guerreiro et al 2015, Golikov et al 2018. Clearly, the issue merits further investigations using CSIA-AA to compare thoroughly TP Bulk with TP CSIA estimates.…”

Section: Validating the Use Of D 13 C Aa And D 15 N Aa In Cephalopod mentioning

confidence: 99%

“…Moreover, the ratio of chitin to protein varies within beaks and between beaks, because the undarkened, darkening and darkened parts of beaks contain decreasing relative amounts of chitin over protein (Rubin et al 2010). Hence, overcoming the chitin effect on beaks is of primary importance, and 4 different approaches can be used theoretically (Xavier et al 2015). (1) Quantification of isotopic correction factors allows the comparison of d 15 N Bulk be -tween beaks and soft tissues, with the drawback that corrected values are estimates (Hobson & Cherel 2006, Cherel et al 2009a).…”

Section: Introductionmentioning

confidence: 99%

Amino acid δ13C and δ15N from sclerotized beaks: a new tool to investigate the foraging ecology of cephalopods, including giant and colossal squids

Cherel¹,

Bustamante²,

Richard³

2019

Mar. Ecol. Prog. Ser.

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Combining the use of predators as biological samplers together with measurements of the stable isotopic ratios (d 13 C Bulk and d 15 N Bulk ) of their sclerotized beaks help investigate foraging ecology of poorly known oceanic cephalopods. However, high chitin content (an amino-sugar macromolecule) lowers beak d 15 N Bulk values, thus precluding direct isotopic comparison with other tissues and organisms. To overcome the chitin effect, compound-specific isotopic analysis of amino acids (CSIA-AA) was performed on squid beaks. The method was applied on beaks and muscle, and the resulting d 13 C AA and d 15 N AA values compared between tissues. The usefulness of CSIA was tested by defining the habitat and trophic position (TP CSIA ) of squids using their d 13 C AA and d 15 N AA values. Beak d 13 C AA values were reliably measured on 12 AA that included 5 essential and 7 non-essential AA, and d 15 N AA values were quantified on at least 7 AA that included 2 source and 4 trophic AA. Importantly, d 13 C AA and d 15 N AA varied little between muscle and lower and upper beaks, and TP CSIA estimates were identical regardless of the tissue considered. Tissue d 13 C AA values of both essential and non-essential AA reflected the latitudinal baseline d 13 C gradient that occurs in the Southern Indian Ocean, while beak d 15 N AA from source and trophic AA allowed the disentangling of the baseline effect from the trophic effect, and thus better calculations of squid TP estimates than from d 15 N Bulk values. Beak d 13 C AA and d 15 N AA defined isotopic niches of colossal and giant squids, the 2 largest living invertebrates. In subantarctic waters, they segregate by having species-specific foraging habitats (using d 13 C Gly or d 15 N Phe ) and TP CSIA (using d 15 N Glx and d 15 N Phe ). TP CSIA is higher in colossal (4.7) than giant (4.3) squids, and both values compare well with those of myctophid-eaters, suggesting very large squids prey primarily upon small zoo plankti vorous fishes. As expected, CSIA-AA overcomes the chitin effect on beaks and it is a powerful tool to investigate trophic interactions of cephalopods. The method has a great potential with arthropods, because chitin is a main component of their exoskeleton but the deleterious effect of chitin is overlooked in isotopic studies focusing on crustaceans and insects.

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“…Predators serve as 'biological samplers,' and cephalo pod beaks obtained from stomach contents have also been used to better understand the dynamics of oceanic food webs, especially in the Southern Ocean (e.g. Xavier et al 2013, Guerreiro et al 2015, Negri et al 2016, Seco et al 2016). In the North Pacific, little information is available on the ecology of cephalopod prey families identified from our study.…”

Section: Discussionmentioning

confidence: 99%

Diet of Cuvier’s beaked whales Ziphius cavirostris from the North Pacific and a comparison with their diet world-wide

West¹,

Walker²,

Baird³

et al. 2017

Mar. Ecol. Prog. Ser.

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Cuvier's beaked whales Ziphius cavirostris are distributed world-wide and are recognized as vulnerable to anthropogenic noise. They are the most common cetacean to strand in temporal and spatial proximity to navy sonars. Cuvier's beaked whales are known for their extreme diving capabilities, but diet information, fundamental to understanding foraging at depth, is limited from most regions. We report on 11 441 prey items from stomach contents of 16 stranded or bycaught specimens collected between 1976 and 2016 across the North Pacific. Overall diet was composed of cephalopods, fish, and crustaceans, but was dominated by cephalopods. Thirty-seven cephalopod species representing 16 families contributed 98

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

Cited by 52 publications

References 56 publications

Observation of a Gelatinous Octopod, Haliphron atlanticus, along the Southern West Mariana Ridge: A Unique Cephalopod of Continental Slope and Mesopelagic Communities

Observation of a Gelatinous Octopod, Haliphron atlanticus, along the Southern West Mariana Ridge: A Unique Cephalopod of Continental Slope and Mesopelagic Communities

Amino acid δ13C and δ15N from sclerotized beaks: a new tool to investigate the foraging ecology of cephalopods, including giant and colossal squids

Diet of Cuvier’s beaked whales Ziphius cavirostris from the North Pacific and a comparison with their diet world-wide

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