Greenland Shark (Somniosus microcephalus) stomach contents and stable isotope values reveal an ontogenetic dietary shift
Source at https://doi.org/10.3389/fmars.2019.00125 . Current knowledge on the feeding ecology of the Greenland shark ( Somniosus microcephalus ), a potential top predator in arctic marine ecosystems, is based on small sample sizes as well as narrow size ranges of sharks. Therefore, potential size-re...
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Online Access: | https://hdl.handle.net/10037/15917 https://doi.org/10.3389/fmars.2019.00125 |
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ftunivtroemsoe:oai:munin.uit.no:10037/15917 2023-05-15T15:13:00+02:00 Greenland Shark (Somniosus microcephalus) stomach contents and stable isotope values reveal an ontogenetic dietary shift Nielsen, Julius Christiansen, Jørgen Schou Grønkjær, Peter Bushnell, Peter G. Steffensen, John Fleng Kiilerich, Helene O. Præbel, Kim Hedeholm, Rasmus 2019-04-04 https://hdl.handle.net/10037/15917 https://doi.org/10.3389/fmars.2019.00125 eng eng Frontiers Frontiers in Marine Science Nielsen, J., Christiansen, J.S., Grønkjær, P., Bushnell, P., Steffensen, J.F., Kiilerich, H.O., . Hedeholm, R. (2019). Greenland Shark (Somniosus microcephalus) Stomach Contents and Stable Isotope Values Reveal an Ontogenetic Dietary Shift. Frontiers in Marine Science, 6 , 125. https://doi.org/10.3389/fmars.2019.00125 FRIDAID 1690365 doi:10.3389/fmars.2019.00125 2296-7745 https://hdl.handle.net/10037/15917 openAccess VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 Greenland shark diet feeding ecology stomach content isotopes Journal article Tidsskriftartikkel Peer reviewed 2019 ftunivtroemsoe https://doi.org/10.3389/fmars.2019.00125 2021-06-25T17:56:42Z Source at https://doi.org/10.3389/fmars.2019.00125 . Current knowledge on the feeding ecology of the Greenland shark ( Somniosus microcephalus ), a potential top predator in arctic marine ecosystems, is based on small sample sizes as well as narrow size ranges of sharks. Therefore, potential size-related feeding patterns remain poorly documented. Using stomach content data ( N = 88) and stable isotope values of white muscle tissue ( N = 40), this study evaluates the diet of sharks ranging in size from 81 to 474 cm (total length). The importance of prey categories (“Fish,” “Mammal,” “Squid,” “Crustacean,” and “Other”) was evaluated based on the reconstructed prey biomass of the stomach contents. Stable isotope values of δ13C and δ15N ranged between -14.4 to -19.9‰ and 11.8 to 17.2‰, respectively. The importance of each prey category was estimated by the Index of Relative Importance (IRI). Our findings suggest that the smallest Greenland sharks (<200 cm) feed on lower trophic level prey, predominantly squids. Larger sharks (>200 cm) mainly feed on higher trophic level prey such as seals, epibenthic and benthic fishes including gadoids (Gadidae), skates (Rajidae), righteye flounders (Pleuronectidae), lumpfish (Cyclopteridae), wolffish (Anarhichadidae), and redfish (Sebastidae). Redfish were, however, only found to be important in the largest sharks sampled (>400 cm). In addition to demonstrating ontogenetic shifts in their feeding preferences, this study supports that Greenland sharks are capable of active predation on fast swimming seals and large fishes. Article in Journal/Newspaper Arctic Greenland Somniosus microcephalus University of Tromsø: Munin Open Research Archive Arctic Greenland Frontiers in Marine Science 6 |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 Greenland shark diet feeding ecology stomach content isotopes |
spellingShingle |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 Greenland shark diet feeding ecology stomach content isotopes Nielsen, Julius Christiansen, Jørgen Schou Grønkjær, Peter Bushnell, Peter G. Steffensen, John Fleng Kiilerich, Helene O. Præbel, Kim Hedeholm, Rasmus Greenland Shark (Somniosus microcephalus) stomach contents and stable isotope values reveal an ontogenetic dietary shift |
topic_facet |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 Greenland shark diet feeding ecology stomach content isotopes |
description |
Source at https://doi.org/10.3389/fmars.2019.00125 . Current knowledge on the feeding ecology of the Greenland shark ( Somniosus microcephalus ), a potential top predator in arctic marine ecosystems, is based on small sample sizes as well as narrow size ranges of sharks. Therefore, potential size-related feeding patterns remain poorly documented. Using stomach content data ( N = 88) and stable isotope values of white muscle tissue ( N = 40), this study evaluates the diet of sharks ranging in size from 81 to 474 cm (total length). The importance of prey categories (“Fish,” “Mammal,” “Squid,” “Crustacean,” and “Other”) was evaluated based on the reconstructed prey biomass of the stomach contents. Stable isotope values of δ13C and δ15N ranged between -14.4 to -19.9‰ and 11.8 to 17.2‰, respectively. The importance of each prey category was estimated by the Index of Relative Importance (IRI). Our findings suggest that the smallest Greenland sharks (<200 cm) feed on lower trophic level prey, predominantly squids. Larger sharks (>200 cm) mainly feed on higher trophic level prey such as seals, epibenthic and benthic fishes including gadoids (Gadidae), skates (Rajidae), righteye flounders (Pleuronectidae), lumpfish (Cyclopteridae), wolffish (Anarhichadidae), and redfish (Sebastidae). Redfish were, however, only found to be important in the largest sharks sampled (>400 cm). In addition to demonstrating ontogenetic shifts in their feeding preferences, this study supports that Greenland sharks are capable of active predation on fast swimming seals and large fishes. |
format |
Article in Journal/Newspaper |
author |
Nielsen, Julius Christiansen, Jørgen Schou Grønkjær, Peter Bushnell, Peter G. Steffensen, John Fleng Kiilerich, Helene O. Præbel, Kim Hedeholm, Rasmus |
author_facet |
Nielsen, Julius Christiansen, Jørgen Schou Grønkjær, Peter Bushnell, Peter G. Steffensen, John Fleng Kiilerich, Helene O. Præbel, Kim Hedeholm, Rasmus |
author_sort |
Nielsen, Julius |
title |
Greenland Shark (Somniosus microcephalus) stomach contents and stable isotope values reveal an ontogenetic dietary shift |
title_short |
Greenland Shark (Somniosus microcephalus) stomach contents and stable isotope values reveal an ontogenetic dietary shift |
title_full |
Greenland Shark (Somniosus microcephalus) stomach contents and stable isotope values reveal an ontogenetic dietary shift |
title_fullStr |
Greenland Shark (Somniosus microcephalus) stomach contents and stable isotope values reveal an ontogenetic dietary shift |
title_full_unstemmed |
Greenland Shark (Somniosus microcephalus) stomach contents and stable isotope values reveal an ontogenetic dietary shift |
title_sort |
greenland shark (somniosus microcephalus) stomach contents and stable isotope values reveal an ontogenetic dietary shift |
publisher |
Frontiers |
publishDate |
2019 |
url |
https://hdl.handle.net/10037/15917 https://doi.org/10.3389/fmars.2019.00125 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Somniosus microcephalus |
genre_facet |
Arctic Greenland Somniosus microcephalus |
op_relation |
Frontiers in Marine Science Nielsen, J., Christiansen, J.S., Grønkjær, P., Bushnell, P., Steffensen, J.F., Kiilerich, H.O., . Hedeholm, R. (2019). Greenland Shark (Somniosus microcephalus) Stomach Contents and Stable Isotope Values Reveal an Ontogenetic Dietary Shift. Frontiers in Marine Science, 6 , 125. https://doi.org/10.3389/fmars.2019.00125 FRIDAID 1690365 doi:10.3389/fmars.2019.00125 2296-7745 https://hdl.handle.net/10037/15917 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.3389/fmars.2019.00125 |
container_title |
Frontiers in Marine Science |
container_volume |
6 |
_version_ |
1766343602392268800 |