Hofmeyr, G J Greg; Bester, Marthán Nieuwoudt; Kirkman, Steve P; Lydersen, Christian; Kovacs, Kit Maureen (2010): (Table 1) Prey species identified from the scats of Antarctic fur seals (Arctocephalus gazella) on Bouvet Island [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.811221, Supplement to: Hofmeyr, GJG et al. (2010): Intraspecific differences in the diet of Antarctic fur seals at Nyrøysa, Bouvetøya. Polar Biology, 33(9), 1171-1178, https://doi.org/10.1007/s00300-010-0805-0
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Abstract:
Intraspecific differences in the diets of many species of pinnipeds are to be expected in view of the great differences in morphology, life history and foraging behaviour between the sexes of many species. We examined the diet of the Antarctic fur seal population at Bouvetøya, Southern Ocean, to assess intersexual differences. This was made possible by the analysis of prey remains extracted from scats and regurgitations collected in areas used primarily by one or the other sex. The results indicate that both males and females feed primarily on Antarctic krill Euphausia superba with several species of fish and squid being taken, likely opportunistically given their prevalence. Significant differences were identified in the frequency of occurrence of otoliths in scats and the percentage numerical abundance of the major fish prey species in the diet. Adult males ate a smaller quantity of fish overall, but ate significantly more of the larger fish species. The greater diving capabilities of males and the fact that they are not limited in the extent of their foraging area by having to return regularly to feed dependant offspring may play a role in the differences found between the diets of males and females. Additionally, females might be more selective, favouring myctophids because they are richer in energy than krill. The absence of major differences in the diet between the sexes at this location is likely due to the high overall abundance of prey at Bouvetøya.
Project(s):
Coverage:
Latitude: -54.415000 * Longitude: 3.318000
Date/Time Start: 2001-12-20T00:00:00 * Date/Time End: 2002-02-07T00:00:00
Event(s):
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Area/locality | Area | Hofmeyr, G J Greg | at Nyrøysa | ||
| 2 | Taxon/taxa | Taxa | Hofmeyr, G J Greg | |||
| 3 | Species | Species | Hofmeyr, G J Greg | |||
| 4 | Arctocephalus gazella, stomach content | A. gazella stomach cont | % | Hofmeyr, G J Greg | Identified from scat remains (faeces) | % frequency of prey occurrence |
| 5 | Arctocephalus gazella, stomach content | A. gazella stomach cont | % | Hofmeyr, G J Greg | Identified from scat remains (faeces) | % numerical abundance of non-krill prey |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
279 data points
Data
| 1 Area (at Nyrøysa) | 2 Taxa | 3 Species | 4 A. gazella stomach cont [%] (% frequency of prey occurrence) | 5 A. gazella stomach cont [%] (% numerical abundance of non-...) |
|---|---|---|---|---|
| Main Colony (MC) | Krill | Euphausia superba | 100.0 | |
| Main Colony (MC) | Fish | Electrona antarctica | 47.1 | 62.9 |
| Main Colony (MC) | Fish | Electrona carlsbergi | 2.9 | 0.5 |
| Main Colony (MC) | Fish | Gymnoscopelus nicholsi | 14.3 | 12.3 |
| Main Colony (MC) | Fish | Gymnoscopelus braueri | 8.6 | 13.3 |
| Main Colony (MC) | Fish | Gymnoscopelus bolini | 1.4 | 0.3 |
| Main Colony (MC) | Fish | Gymnoscopelus piabilis | 0.0 | 0.0 |
| Main Colony (MC) | Fish | Gymnoscopelus spp. | 4.3 | 1.0 |
| Main Colony (MC) | Fish | Krefftichthys andersoni | 0.0 | 0.0 |
| Main Colony (MC) | Fish | Metelectrona ventralis | 0.0 | 0.0 |
| Main Colony (MC) | Fish | Protomyctophum tenisoni | 0.0 | 0.0 |
| Main Colony (MC) | Fish | Protomyctophum choriodon | 1.4 | 0.3 |
| Main Colony (MC) | Fish | Lepidonotothen larseni | 2.9 | 1.0 |
| Main Colony (MC) | Fish | Notolepsis coatsi | 1.4 | 0.5 |
| Main Colony (MC) | Fish | Indeterminata (unidentified otoliths) | 7.1 | 2.6 |
| Main Colony (MC) | Squid | Brachioteuthis riisei | 8.6 | 3.4 |
| Main Colony (MC) | Squid | Moroteuthis knipovitchi | 1.4 | 0.3 |
| Main Colony (MC) | Squid | Indeterminata (unidentifiable squid beaks) | 7.1 | 1.6 |
| Main Colony (MC) | Total non-krill prey items | 57.1 | 100.0 | |
| Slopes | Krill | Euphausia superba | 98.6 | |
| Slopes | Fish | Electrona antarctica | 35.7 | 69.0 |
| Slopes | Fish | Electrona carlsbergi | 1.4 | 0.7 |
| Slopes | Fish | Gymnoscopelus nicholsi | 15.7 | 12.5 |
| Slopes | Fish | Gymnoscopelus braueri | 7.1 | 3.6 |
| Slopes | Fish | Gymnoscopelus bolini | 0.0 | 0.0 |
| Slopes | Fish | Gymnoscopelus piabilis | 0.0 | 0.0 |
| Slopes | Fish | Gymnoscopelus spp. | 0.0 | 0.0 |
| Slopes | Fish | Krefftichthys andersoni | 1.4 | 0.4 |
| Slopes | Fish | Metelectrona ventralis | 1.4 | 0.7 |
| Slopes | Fish | Protomyctophum tenisoni | 1.4 | 0.4 |
| Slopes | Fish | Protomyctophum choriodon | 0.0 | 0.4 |
| Slopes | Fish | Lepidonotothen larseni | 0.0 | 0.0 |
| Slopes | Fish | Notolepsis coatsi | 0.0 | 0.0 |
| Slopes | Fish | Indeterminata (unidentified otoliths) | 5.7 | 1.8 |
| Slopes | Squid | Brachioteuthis riisei | 15.7 | 6.8 |
| Slopes | Squid | Moroteuthis knipovitchi | 2.9 | 1.1 |
| Slopes | Squid | Indeterminata (unidentifiable squid beaks) | 7.1 | 2.8 |
| Slopes | Total non-krill prey items | 52.9 | 100.0 | |
| Sorstrand | Krill | Euphausia superba | 97.1 | |
| Sorstrand | Fish | Electrona antarctica | 20.0 | 47.7 |
| Sorstrand | Fish | Electrona carlsbergi | 0.0 | 0.0 |
| Sorstrand | Fish | Gymnoscopelus nicholsi | 10.0 | 16.8 |
| Sorstrand | Fish | Gymnoscopelus braueri | 5.7 | 19.5 |
| Sorstrand | Fish | Gymnoscopelus bolini | 2.9 | 2.0 |
| Sorstrand | Fish | Gymnoscopelus piabilis | 1.4 | 1.3 |
| Sorstrand | Fish | Gymnoscopelus spp. | 0.0 | 0.0 |
| Sorstrand | Fish | Krefftichthys andersoni | 0.0 | 0.0 |
| Sorstrand | Fish | Metelectrona ventralis | 0.0 | 0.0 |
| Sorstrand | Fish | Protomyctophum tenisoni | 0.0 | 0.0 |
| Sorstrand | Fish | Protomyctophum choriodon | 0.0 | 0.0 |
| Sorstrand | Fish | Lepidonotothen larseni | 0.0 | 0.0 |
| Sorstrand | Fish | Notolepsis coatsi | 1.4 | 1.3 |
| Sorstrand | Fish | Indeterminata (unidentified otoliths) | 2.9 | 4.7 |
| Sorstrand | Squid | Brachioteuthis riisei | 8.6 | 4.7 |
| Sorstrand | Squid | Moroteuthis knipovitchi | 1.4 | 0.7 |
| Sorstrand | Squid | Indeterminata (unidentifiable squid beaks) | 1.4 | 1.3 |
| Sorstrand | Total non-krill prey items | 27.1 | 100.0 |