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  • 1
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    Extensive release of methane from Arctic seabed west of Svalbard during summer 2014 does not influence the atmosphere (2016)
    AGU (American Geophysical Union) | Wiley
    In:  Geophysical Research Letters, 43 (9). pp. 4624-4631.
    Details
    Publication Date: 2020-10-16
    Description: We find that summer methane (CH4) release from seabed sediments west of Svalbard substantially increases CH4 concentrations in the ocean but has limited influence on the atmospheric CH4 levels. Our conclusion stems from complementary measurements at the seafloor, in the ocean, and in the atmosphere from land-based, ship and aircraft platforms during a summer campaign in 2014. We detected high concentrations of dissolved CH4 in the ocean above the seafloor with a sharp decrease above the pycnocline. Model approaches taking potential CH4 emissions from both dissolved and bubble-released CH4 from a larger region into account reveal a maximum flux compatible with the observed atmospheric CH4 mixing ratios of 2.4–3.8 nmol m−2 s−1. This is too low to have an impact on the atmospheric summer CH4 budget in the year 2014. Long-term ocean observatories may shed light on the complex variations of Arctic CH4 cycles throughout the year.
    Type: Article , PeerReviewed
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  • 2
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    Gut contents of a giant squidArchiteuthis dux(Cephalopoda: Oegopsida) from New Zealand waters (2004)
    The Royal Society of New Zealand
    In:  New Zealand Journal of Zoology, 31 (1). pp. 15-21.
    Details
    Publication Date: 2021-08-02
    Description: New diet information for the giant squid (Architeuthis dux) is presented based on the identification of substantial identifiable prey items recovered from the gut contents of a specimen caught in New Zealand waters. Prey items are attributed to two species of squid: Nototodarus sp. and Architeuthis dux. The incidence of Nototodarus in the stomach contents is not new, but the occurrence of Architeuthis remains is. Numerous fragments of an Architeuthis tentacular club, consisting of carpus, manus, and dactylus suckers, and the dactylic pouch, introduce the possibility of cannibalism—a hitherto unreported behaviour in this genus. A synopsis of Architeuthis diet is presented and alternatives to cannibalism (such as autophagy) are evaluated.
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  • 3
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    Notes on New Zealand mammals 6. Second report on the stomach contents of long‐finned pilot whales,Globicephala melas (2007)
    The Royal Society of New Zealand | Taylor & Francis
    In:  New Zealand Journal of Zoology, 34 (4). pp. 359-362.
    Details
    Publication Date: 2021-07-29
    Description: We report data on the stomach contents of the long‐finned pilot whale, Globicephala melas, recovered from a group of whales stranded on Ruakaka Beach, northeastern New Zealand, in November 2006. In nine whales for which identifiable stomach contents were recovered (three that stranded on 10 November and six that stranded on 11 November) prey remains comprised exclusively cephalopod beaks attributed to five squid species. The stomachs of a further two whales contained unidentifiable upper beaks only, while the stomachs of five whales were completely empty. No whale appeared to have been satiated immediately before stranding, given that the maximum biomass of prey recently consumed by any one whale was calculated to be 〈5 kg. All squids ingested represented oceanic species, found from 50 to 1000 m but more common towards the deeper end of this range. These data both complement and contrast with the only other dietary information available for this species in New Zealand waters, reported from stomach contents of whales stranded on Farewell Spit, South Island in December 2005.
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  • 4
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    First report on the stomach contents of long‐finned pilot whales, Globicephala melas, stranded in New Zealand (2007)
    Taylor & Francis
    In:  New Zealand Journal of Zoology, 34 (1). pp. 51-56.
    Details
    Publication Date: 2021-07-29
    Description: Stomach contents of the long‐finned pilot whale, Globicephala melas, are reported for the first time from New Zealand waters. Analyses based on two male and three female whales (2.5–5.3 m in length) that stranded on Farewell Spit, Golden Bay, South Island in December 2005 revealed a diet comprised exclusively of cephalopods (2-33 lower cephalopod beaks per stomach). Two genera of cephalopod from two orders; arrow squid, Nototodarus spp. (Teuthoidea: Ommastrephidae), and common octopus, Pinnoctopus cordiformis (Octopoda: Octopodidae) were represented. A further five pilot whale stomachs were examined and found to be empty.
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