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Marine Ecology Progress Series

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MEPS 629:67-86 (2019)  -  DOI:

Trophic ecology of the deep-sea cephalopod assemblage near Bear Seamount in the Northwest Atlantic Ocean

Michelle D. Staudinger1,2,10,*, Valerie H. Dimkovikj3, Christine A. M. France4, Elaina Jorgensen5, Heather Judkins6, Annie Lindgren7, Elizabeth K. Shea8, Michael Vecchione9

1Missouri Cooperative Fish and Wildlife Research Unit, Department of Fisheries and Wildlife Sciences, Anheuser-Busch Natural Resources Building, University of Missouri, Columbia, MO 65211, USA
2Department of Environmental Conservation, University of Massachusetts, Amherst, MA 01003-9297, USA
3Coastal Carolina University, Conway, SC 29528, USA
4Museum Conservation Institute, Smithsonian Institution, Suitland, MD 20746, USA
5National Marine Fisheries Service, Alaska Fisheries Science Center, Seattle, WA 98115, USA
6Department of Biological Sciences, University of South Florida St. Petersburg, St. Petersburg, FL 33701, USA
7Center for Life in Extreme Environments, Portland State University, Portland, OR 97207, USA
8Delaware Museum of Natural History, Wilmington, DE 19807, USA
9National Marine Fisheries Service, National Systematics Laboratory, National Museum of Natural History, Washington, DC 20013, USA
10Present address: Department of the Interior Northeast Climate Science Center, 134 Morrill Science Center, University of Massachusetts, Amherst, MA 01003-9297, USA
*Corresponding author:

ABSTRACT: Cephalopods compose a vital component of marine food webs worldwide, yet their trophic roles remain largely unresolved. This study used stable carbon and nitrogen isotopes to describe the trophic structure, ontogeny, and isotopic niche overlap of cephalopod groups from pelagic and near-bottom habitats around Bear Seamount in the Northwest Atlantic Ocean. Beaks from 225 specimens (13 families; 27 species), primarily from juvenile and sub-adult life stages, were collected during a deep-sea biodiversity cruise conducted in 2012. Differences in mean δ15N and δ13C values were detected among some families and across species within the families Ommastrephidae, Histioteuthidae, Mastigoteuthidae, and the superfamily Argonautoidea. Trophic positions ranged from 2.7 to 4.5 across assemblage members, with top positions held by Illex illecebrosus, Histioteuthis reversa, Octopoteuthis sicula, Taonius pavo, and Haliphron atlanticus. Cephalopod families exhibiting the broadest and most diverse isotopic niche widths overall included Ommastrephidae, Cranchiidae, and Octopoteuthidae. Families with the narrowest isotopic niches included Onychoteuthidae and the monospecific Joubiniteuthidae, and Vampyroteuthidae. Trophic position increased significantly with body size (mantle length) across all individuals sampled, and ontogenetic shifts in δ15N values were detected in 7 species. The continuous gradient and broad range of isotope values across families, species, and body sizes suggest an unstructured assemblage comprised of generalist and specialist foragers distributed throughout a vertical depth range of pelagic (depleted δ13C values) to near-bottom bathy/benthopelagic (enriched δ13C values) habitats. The results provide some of the first quantitative trophic metrics for many poorly studied species and advance our understanding of the diversity of cephalopod ecological roles in marine ecosystems.

KEY WORDS: Cephalopods · Deep-sea · Mesopelagic · Bathy/benthopelagic · Seamount · Stable isotope analysis · Community structure · Trophic position · Ontogenetic shifts

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Cite this article as: Staudinger MD, Dimkovikj VH, France CAM, Jorgensen E and others (2019) Trophic ecology of the deep-sea cephalopod assemblage near Bear Seamount in the Northwest Atlantic Ocean. Mar Ecol Prog Ser 629:67-86.

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