Résultats de la recherche
-
Whales: Trophic modelling of the Ross Sea
Description / Abstract: A supporting document to the CCAMLR Science paper: M.H. Pinkerton, J.M ... . Bradford-Grieve and S.M. Hanchet. 2010. A balanced model of the food web of the Ross Sea, Antarctica ... accounting for mortality loss. This increase in biomass is exported at the end of the summer when the whales ... mortality for males and females, and use values at the lower end of those found by Olesiuk et al. (1990) of ... the numerator represents the increase in biomass of the population while in the study area after ... modelling of the Ross Sea M.H. Pinkerton1, J. Bradford-Grieve1, P.M. Sagar2 1 National Institute of ...
Document : Site Section: Publications
-
Fishes: Trophic modelling of the Ross Sea
Description / Abstract: A supporting document to the CCAMLR Science paper: M.H. Pinkerton, J.M ... . Bradford-Grieve and S.M. Hanchet. 2010. A balanced model of the food web of the Ross Sea, Antarctica ... data are available yet. Table 1. List of fishes from the Ross Sea as defined in this report (after ... km to the north off Cape Adare after 3.3 years at liberty, three were recaptured more than 1000 m to ... altogether after 18 years at liberty (Dunn et al. 2007d). Of the six large- scale movements of fish tagged ... 1 Fishes: Trophic modelling of the ...
Document : Site Section: Publications
-
Assessing the power to detect systematic change in Adélie penguin foraging trip duration
Paper Title: Assessing the power to detect systematic change in Adélie penguin foraging trip ... variation was known to occur. Variability among trips and penguins was greater in the crèche stage, but ... variability among years was greater in the guard stage. Estimates of variability were used to explore the ... greater in the crèche stage than the guard stage. The gain obtained by increasing the number of penguins ... ‘ramp’ change in which there is a constant rate of increase for a number of years, after which the ... the guard and crèche stages respectively, (ii) an impact after a years causes either a step, ramp or ... model This model assumes a proportional increase in foraging trip duration in the years after an ... rate of change of P% (i.e. the proportionate increase, p = P/100) after an impact, the statistic t ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 201–215 : Auteur(s): Southwell, C., J. Clarke and L.M. Emmerson
-
By-catch, growth and feeding of Antarctic juvenile fish taken in krill (Euphausia superba Dana) fisheries in the South Georgia area, in 1992
superba Dana) fisheries in the South Georgia area, in 1992 Abstract / Description: This paper discusses ... an investigation of juvenile Antarctic fish caught during krill fishing by the FV Grigory Kovtun in ... the area around South Georgia from May to July 1992. Two species were predominant in the by-catches ... : Champsocephalus gunnari and Nototheniops larseni. The frequency of occurrence of juvenile fish was 18.2% when all ... stomachs were measured (euphausiids: from the tip of the rostrum to the end of telson) and weighed. The ... ., 1978; North and Ward, 1990). After leaving the fjords, they change their diet to E. superba ... FEEDING OF ANTARCTIC JUVENILE FISH TAKEN IN KRILL (EUPHAUSIA SUPERBA DANA) FISHERIES IN THE SOUTH GEORGIA ... caught during krill fishing by the FV Grigoy Kovtun in the area around South Georgia from May to July ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 129–142 : Auteur(s): Pakhomov, E.A. and S.A. Pankratov
-
Observation of seabirds in the Southern Ocean in 1988/89
Paper Title: Observation of seabirds in the Southern Ocean in 1988/89 Abstract / Description ... : This paper examines the numerical and species distribution of birds in the sub-Antarctic area of the ... Southern Ocean to the south of 60°S. Thirty minute observations were made daily during daylight hours at 8 ... ports of call. Maps summarize the distribution of 14 bird species as well as of the individual species ... visibility, type of precipitation and ice cover, which have a direct impact on bird behaviour. At the end of ... (Figure 8) after which it was sporadically sighted in Prydz Bay and in the area of Mirny Station (Figure ... WG-CEMP-90/33 OBSERVATION OF SEABIRDS IN THE SOUTHERN ... OCEAN IN 1988/89 A.V. Vagin and V.V. Popov* * Abstract This paper examines the numerical and ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 521–542 : Auteur(s): Vagin, A.V. and V.V. Popov
-
Observations on haul-out patterns and trends in the breeding populations of southern elephant seal at Península Valdés (Patagonia) and Stranger Point (25 de Mayo - King George I.)
Paper Title: Observations on haul-out patterns and trends in the breeding populations of southern ... de Mayo-King George I. were studied during the breeding season from 1979 to 1987. Two main objectives ... were taken into consideration: haul-out pattern and the female population trend. In both places, the ... intrinsic population growth rate is positive. In 1982, at Stranger Point, a sharp decrease of the female ... second one was included because after the breeding season, females from Peninsula Valdes go to the ... the basis of a single census, at Stranger Point this should be carried out after the 30/10 (27/10 ... plus the 3-days rank), and at Peninsula Valdes after the 5/10 (30/9 plus 5-days rank). Here the ... places after the breeding season have been confirmed with male of elephant seal from Kerguelen to ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 453-463 : Auteur(s): Vergani, D.F., M.N. Lewis and Z.B. Stanganelli
-
Length- and age-at-spawning of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea
Paper Title: Length- and age-at-spawning of Antarctic toothfish (Dissostichus mawsoni) in the ... -at-spawning for female and male Antarctic toothfish (Dissostichus mawsoni) from fish sampled in the ... Ross Sea spanning the 2000–2009 fishing seasons. A characterisation of the oocyte developmental cycle ... of D. mawsoni shows that once development begins, oocytes grow and accumulate at the cortical alveoli ... Kellermann (1991), samples with the most advanced oocyte stage of cortical alveoli (end of the primary ... ovaries of fish sam- pled after the spawning season (hindcasting). This evidence consists of post ... difference is a result of three factors: (i) females generally begin developing when older; (ii) the female ... small fish that begin vitellogenesis later. The potential bias in hindcasting is that if remnant ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 53–73 : Auteur(s): Parker, S.J. and P.J. Grimes
-
Estimating unaccounted fishing mortality in the Ross Sea region and Amundsen Sea (CCAMLR Subareas 88.1 and 88.2) bottom longline fisheries targeting Antarctic toothfish
Paper Title: Estimating unaccounted fishing mortality in the Ross Sea region and Amundsen Sea ... counted in estimates of total fishing removals or otherwise accounted for in stock assessment models. The ... mortality resulting from the loss of sections of bottom longline gear in the Ross Sea region and Subarea ... average 208 tonnes of Antarctic toothfish mortality may be unaccounted for annually. While the current ... that these hooks were unlikely to cause further fish mortality after being lost. The following ... : Total number of hooks set before grooming, number of hooks on those sets retained after the grooming ... procedure and the proportion of data remaining after grooming by gear type. Gear Before After Proportion ... Table 1: Total number of hooks set before grooming, number of hooks on those sets retained after the ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 17–30 : Auteur(s): Webber, D.N. and S.J. Parker
-
Distribution of krill (Euphausia superba Dana) catches in the South Shetlands and South Orkneys
Paper Title: Distribution of krill (Euphausia superba Dana) catches in the South Shetlands and ... selected colonies of penguins distributed around the coasts of the South Shetland and South Orkney Islands ... distribution in Subarea 48.2, probably as a result of more variable hydrographic conditions. About 50% of the ... catch in Subarea 48.1 from December to March was taken within 40 km of the coast, and 90% within 80 km ... contours (start and end of the continental slope are shown. A = Anvers Island, B = Brabant Island, L ... considered in the management of commercial harvesting. After an initially rapid expansion to 500 000 ... DANA) CATCHES IN THE SOUTH SHETLANDS AND SOUTH ORKNEYS DJ. Agnew* Abstract A set of concentric ... zones of 20 km width was defined around selected colonies of penguins distributed around the coasts of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 287–303 : Auteur(s): Agnew, D.J.
-
The utilization of seabird censuses for krill monitoring
Paper Title: The utilization of seabird censuses for krill monitoring Abstract / Description ... : The possibility of using bird observations made at sea as a means of monitoring krill in the Antarctic ... krill abundance. A vector close to multi-normality was obtained, thus suggesting that refinements of the ... technique will allow the discrimination of krill levels by means of bird counts thereby providing an ... curves coming from different plots should be compared with caution after rescaling the drawings ... - 393 - THE UTILIZATION OF SEABIRD CENSUSES FOR KRILL ... MONITORING E.R. Marschoff, J.G. Visbeek and L.R. Fontana (Argentina) Abstract WG-CEMP-87/9 The ... possibility of using bird observations made at sea as a means of monitoring krill in the Antarctic ocean is ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 393-425 : Auteur(s): Marschoff, E.R., J.G. Visbeek and L.R. Fontana