Resultados de la búsqueda

1. Preliminary study on nesting Adélie penguins disturbance by unmanned aerial vehicles

   Abstract / Description:  The importance of unmanned aerial vehicles (UAVs) in remote sensing is rapidly ... potential effects of wildlife disturbance by fixed-wing UAVs are investigated. In austral summer 2014/15 ... , UAV overflights were conducted in the Adelié penguin (Pygoscelis adeliae) breeding colony at Point ... . Thomas (Western Shore of Admiralty Bay, King George Island, Antarctica, Subarea 48.1). The impacts of ... of the skua overflight. This resulted in a mean duration of type III behaviour of 5.8 seconds (SD ... increase in the mean number of activity types was observed in birds during the overflight by a UAV ... The importance of unmanned aerial vehicles (UAVs) in remote sensing is rapidly growing. However ... conducted in the Adelié penguin (Pygoscelis adeliae) breeding colony at Point. Thomas (Western Shore of ...

   Science Journal Paper : CCAMLR Science, Volume 23 (CCAMLR Science, Volume 23) : 1–16 : Autor(es): Korczak-Abshire, M., A. Kidawa, A. Zmarz, R. Storvold, S.R. Karlsen, M. Rodzewicz, K. Chwedorzewska and A. Znój

2. Seabird interactions with trawl and longline fisheries for Dissostichus eleginoides and Champsocephalus gunnari

   and Champsocephalus gunnari Abstract / Description:  The behaviour of seabirds and the rate of ... (Dissostichus eleginoides) in the 1994/95 season near Macquarie Island and Kerguelen Island. Longlining for D ... associated with longlining in the Kerguelen region were lower than those reported for the South Georgia area ... , probably because the birds at the former site are distracted from the longlines by the discharge of offal ... i s outside the CCAMLR area, north of Subarea 88.1. A total of 450 tonnes was caught in that ... observations. METHODS The h i g h mor t a l i t y of seab i rds , ma in ly Three types of fishing ... Division 58.5.1 during longline fishery for D. eleginoides in the vicinity of the 1994/95 season with two ... Cherel et al. (1995), in which setting and hauling of the lines of 2 400 hooks takes place both by day ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 93–99 : Autor(es): Williams, R. and D. Capdeville

3. Archival and satellite-linked data recorders

   behaviour. The records can be recovered in one of two ways: the data recorder must either be recovered ... provides an overview of currently-available data recorders for use in research on marine animals. These ... intact, or the data recorder must be capable of disseminating its data via a radio link, such as the ... . Raw-data recorders keep a complete record of the diving parameters of interest and thus produce ... animals and gather data on aspects of an animal's diving behaviour. The records can be recovered in one ... equivalents of these two types of recorders have become available. A raw-data recorder is one in which the ... generally measure the depth of diving animals, although they are not necessarily limited in this respect ... is expected to be available in the summer of 1989 (Northwest Marine Technology (MNT) Archival Tag ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 475-493 : Autor(es): Hill, R.D.

4. Editorial

   the Southern Ocean. In particular there is a suite of papers that address key aspects of improving ... of analysis of data gathered on fishing vessels to using trends in patents to predict the future for ... specialist groups as well as the more traditional peer-review process. The papers in this volume of CCAMLR ... fishing in the Convention Area. For example, in the case of toothfish there are papers that develop our ... . In particular there is a suite of papers that address key aspects of improving assessment of the ... analysis of data gathered on fishing vessels to using trends in patents to predict the future for krill ... well as the more traditional peer-review process. The papers in this volume of CCAMLR Science broadly ... reflect the important areas of research used to provide advice on the management of fishing in the ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 167 : Autor(es): Editors

5. A post-processing method to remove interference noise from acoustic data collected from Antarctic krill fishing vessels

   relevant virtual variable operators in the existing acoustic data post-processing software. The utility of ... from Antarctic krill fishing vessels Abstract / Description:  The use of fishing-vessel-based acoustic ... data has been recognised as an important way to estimate the distribution and relative abundance of ... Antarctic krill (Euphausia superba), yet the quality and even the utility of the data may be seriously ... distribution of mean Sv in a ping randomly selected from the region between the dashed lines in Figure 4(a ... respectively. The frequency occurrence of mean Sv is the number of mean Sv grouped in 3 dB intervals, while ... Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) to set the precautionary ... of krill samples in the treated dataset, which can be determined by gradually increasing the ...

   Science Journal Paper : CCAMLR Science, Volume 23 (CCAMLR Science, Volume 23) : 17–30 : Autor(es): Wang, X., J. Zhang and X. Zhao

6. Survey design to estimate krill abundance during FIBEX

   methodology for assessing the abundance of krill. The survey design used in the southwest Atlantic study area ... of the FIBEX is described in this paper. Sampling involved the use of echo sounders for estimating ... krill abundance as well as collection of data on the size, density and distribution of krill swarms. In ... also collected. The study area was subdivided into several geographically distinct subareas in each of ... of krill. The survey design used in the southwest Atlantic study area of the FIBEX is described in ... collection of data on the size, density and distribution of krill swarms. In addition, information on ... of transects was surveyed and these were also used to fix stratum boundaries. In the second phase ... . 1 . INTRODUCTION Increasing interest in the marine living resources of the Southern Ocean has ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 253–263 : Autor(es): Everson, I., I. Hampton and G.M. Jolly

7. Length-based assessment for mackerel icefish (Champsocephalus gunnari) at South Georgia

   accurate identification of age cohorts from the survey data. In this paper a length-based approach is ... data which, in conjunction with the bootstrapped survey biomass data, yields an estimate of the ... (Champsocephalus gunnari) in Subarea 48.3 employs the CCAMLR mixture analysis program (CMIX) and generalised yield ... described that removes the problem of cohort determination. A bootstrap technique (consistent with the ... (TAC). One issue is the accurate identification of age cohorts from the survey data. In this paper a ... then employed to obtain an estimate of the total bio- mass in the population. The one-sided lower 95 ... modelling sense this requires the ‘tracking’ or separation of these cohorts through time. In a length ... structure in the recruitment of the population sub-levels – animals of a given length grow from one length ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 129–137 : Autor(es): Hillary, R.M., C.T.T. Edwards, R.E. Mitchell and D.J. Agnew

8. A von Bertalanffy growth model for toothfish at Heard Island fitted to length-at-age data and compared to observed growth from mark–recapture studies

   developed and showed that the bias is relatively small for the range of release lengths in the data ... , the mean trend in observed AGR values with release length compared with those obtained using IWLS ... aged. Subsampling of random lengthfrequency (LF) data used to obtain the samples of fish for ageing ... used length-bin sampling involving a fixed sample size per bin. Estimation of the VB parameters used a ... than 5 years old) to the VB model is also given in order to give more realistic predictions of mean ... ) 5.1085 (0.0602) 0.1012 (0.0148) Candy et al. 52 predictions of mean length-at-age for ages in the 8 ... the range of release lengths in the data. Predictions of AGR using the MLPLB-estimated VB parameters ... removing an oto- lith or other hard part in order to determine age by counting the number of annual growth ...

   Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 43–66 : Autor(es): Candy, S.G., A.J. Constable, T. Lamb and R. Williams

9. Southern elephant seals and CCAMLR

   southern elephant seal (Mirounga leonina) in the Kerguelen province of the Southern Ocean. Sub-populations ... possible causes of the elephant seal’s decline in the region. Such explanations assume that a communal ... it is hoped that this will help to elucidate the reasons for the observed decline of M. leonina  in ... research findings of primarily South African (including some French and Australian results) studies on the ... seal (Mirounga leonina) in the Kerguelen province of the Southern Ocean. Sub-populations of this ... causes of the elephant seal's decline in the region. Such explanations assume that a communal feeding ... (feeding) and two terrestrial (fasting) phases can be distinguished in the annual cycle of at least the ... may be part of a long-term fluctuation in the breeding population size related to density as the ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 465-473 : Autor(es): Bester, M.N. and D.G.M. Miller

10. Small scale krill surveys: simulations based on observed euphausiid distributions

    aggregations. Calculations based on the power of surveys to reliably detect changes in mean density indicate ... be required to detect changes of 40% in the mean if CVs are as high as those obtained in the ... that the coefficient of variation (CV) of mean krill density varies inversely with mean density, and is ... Abstract / Description:  An observed distribution of aggregations of the euphausiid, Meganyctiphanes ... on the power of surveys to reliably detect changes in mean density indicate that with probability ... detect changes of 40% in the mean if CVs are as high as those obtained in the simulations. Resume ... contour lines in krill abundance, and this meant across the mean direction of ocean currents. Some of the ... variance when transects are all the same length). For comparison, the actual mean density of krill in the ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 245–256 : Autor(es): Agnew, D.J. and S. Nicol

Páginas