Metabolism and feeding in the Antarctic brachiopod Liothyrella uva: A low energy lifestyle species with restricted metabolic scope

first_imgThe effect of feeding on metabolism (specific dynamic action; SDA) was assessed in the articulate brachiopod Liothyrella uva (Broderip, 1833) at Signy Island, Antarctica. The response was low and on a much longer timescale than previously reported SDA responses. Oxygen consumption rose post-prandially to a peak which was 1.64 $times $ higher than the prefeeding basal metabolic rate. The response peaked on the 5$^{text{th}}$ day and returned to basal levels on the 18$^{text{th}}$ day after feeding. Maximum metabolic scope was therefore restricted, and was 0.41 $mu $molO$_{2}$ h$^{-1}$ (24.5 microwatts) for a 290 mg ash-free dry mass individual. Unusually ammonia excretion was little affected by feeding, except for a short sharp peak on the 4$^{text{th}}$ post-prandial day. Metabolic O:N ratios were very low, ranging from 2.9 to 6.6 and indicated an almost sole use of protein to fuel metabolism throughout. Urea excretion showed no pattern in relation to feeding, and accounted for around 7% of nitrogen excreted. It is suggested that metabolic scope is limited in L. uva for two reasons: because it has evolved to live at low temperatures and because of phylogenetic limitations related to articulate brachiopod lifestyles.last_img read more

Solstad Offshore announces contract extensions with key clients in Norway

first_imgEquinor has declared an option to extend the contract for anchor handling vessel Normand Ferking with 1 more year to November 2021 Solstad Offshore announces contract extensions with key clients in Norway. (Credit: Solstad Offshore ASA) Solstad Offshore ASA (“Solstad”) is pleased to announce contract extensions with key clients Equinor and Aker BP.Equinor has declared an option to extend the contract for anchor handling vessel Normand Ferking with 1 more year to November 2021. Equinor has the option to extend the contract with further 2 x 1 years. Normand Ferking has been on contract with Equinor since 2007.In addition, as part of the Frame Agreement between Aker BP ASA and Solstad, Aker BP ASA has extended present contract for the PSV Far Solitaire with 12 months, commencing 1st January 2021.Both vessels will continue to support the oil & gas activities on the Norwegian Continental Shelf. Source: Company Press Releaselast_img read more