Результаты поиска

1. A composite recruitment index to describe interannual changes in the population structure of Antarctic krill at South Georgia

   target or station net hauls is described. This composite index is compared with an index where density ... successful recruitment year due to krill spawned in 1994/95. File:  06watkins.pdf ... population in the year after spawning, R2 as the pro ortion of 2+ animals in 2+ an$ older in the seconR°F2 ... distribution for all nets in an area I calculate the absolute number and weight of krill in each size class ... combined using the LSMIX and MLMIX analyses. Recruitment Indices for Cruises between 1989/90 and 1997 ... other years are also characterised by consistently high numbers of krill. Thus, for instance, the high ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 71–84 : Автор(ы): Watkins, J.L

2. Maximum entropy reconstructions of krill distribution and estimates of krill density from acoustic surveys at South Georgia, 1996–2000

   uses an iterative Bayesian approach to infer the most probable krill density for each of the 32 000 0.5 ... survey boxes (dimensions 80 km × 100 km) north of South Georgia. The reconstructions were generated from ... 80 km transects in each box, providing about 1 600 density estimates per box. The MaxEnt technique ... krill densities for each survey, for which the confidence limits are often narrower than those ... (MaxEnt) have been used successfully for many years in numerous branches of physical science to ... survey area, and provides an estimate of the standard deviation about the mean for each cell. The ... ( 19 97 ), JR 28 ( 19 98 ), JR 38 ( 19 99 ) an d A T L D ( 20 00 ). A xe s ar e ... narrow and unimodal and was consequently modelled well by the MaxEnt pro- cess. For cruises with higher ...

   Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 91–100 : Автор(ы): Wafy, M.H., A.S. Brierley, S.F. Gull and J.L. Watkins

3. Assessing the power to detect systematic change in Adélie penguin foraging trip duration

   variability among years was greater in the guard stage. Estimates of variability were used to explore the ... or trips sampled diminished rapidly when sample sizes were greater than 30 penguins and three trips ... per penguin. Statistics were developed to test for three forms of change (step, trend and ramp). A ... test for change based on the difference between pre- and post-impact means generally performed better ... that mean foraging trip duration is constant for years i = 1,2,…,a prior to an impact (i.e. Mi = M0 ... scenarios, analyses were undertaken for a varying number of years of post-impact monitoring (1–10, 15, 20 ... number of impact (step, ramp and trend increases of 25%) and monitoring (1–10, 15, 20, 25 and 30 years ... an ge 0.0 0.2 0.4 0.6 0.8 1.0 0 5 10 15 20 25 30 0.0 0.2 0.4 0.6 0.8 1.0 0 5 10 15 20 25 ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 201–215 : Автор(ы): Southwell, C., J. Clarke and L.M. Emmerson

4. Foraging behaviour and reproductive success in chinstrap penguins: the effects of transmitter attachment

   method with which to monitor foraging trip duration in penguins by the CCAMLR (Commission for the ... , South Shetland Islands. In total, one member of each pair at 20 nests and both members of each pair at ... of this study demonstrate that, for the size of transmitter used (1.4 cm 2 front section area); there ... (Commission for the Conservation of the Antarctic Marine Living Resources) Ecosystem Monitoring Program (CEMP ... 666 nests on Seal Island, South Shetland Islands. In total, one member of each pair at 20 nests and ... a control group. The results of this study demonstrate that, for the size of transmitter used (1.4 ... membre par couple dans 20 nids, et sur les deux membres des couples de 10 nids; 120 nids ont constitue ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 291–303 : Автор(ы): Croll, D.A., J.L. Bengtson, P.L. Boveng, M.E. Goebel and J.K. Jansen

5. Detection and quantitative estimation of krill concentrations by hydroacoustic instruments

   2.107 L 1----. .1- _______ . __ .... __ . ___ _ 30 35 'ID so Figure 1 60 70 80 90 tDO ·120 ISO ... transmitter frequency. Thus, echo sounders operating at comparatively low frequencies (20-30 kHz) are much ... towed antennae is their ease of calibration in the sea - an especially important feature for echo ... desirable that the range of detection for an individual krill should be extended to the limit possible ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 123-139 : Автор(ы): Yudanov, K.I.

6. A quantified Bayesian Maximum Entropy estimate of Antarctic krill abundance across the Scotia Sea and in small-scale management units from the CCAMLR-2000 Survey

   area. Density values for the unsurveyed off-transect portions of the survey area were inferred, and ... thus values for total biomass across the survey area, and within individual small-scale management ... estimated due to the sparseness of data in these regions. The MaxEnt formalism allows an objective choice of ... the parameters of the estimation method, and hence an objective choice of the most probable ... et al. 100 and Sibisi, 1990; Gull and Skilling, 1991; Skilling, 1991; see Sivia, 1996 for an ... which expresses a preference for smoothness (since an equal distribution of krill across all cells has ... particular application of the MaxEnt method. In astrophysics, for example, the data from an instru- ment may ... simply an approximation to a Gaussian point spread func- tion. It is necessary to choose a width for ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 97–116 : Автор(ы): Heywood, B.G., A.S. Brierley and S.F. Gull

7. Otolith and body size relationships in the mackerel icefish (Champsocephalus gunnari)

   give the best predictions of total length, predictions using a common line for all years. we fitted ... length. log,,-transformed data from all years with no restriction on range. The equation for all years ... logloL,, (SEs: constant 0.00738, slope 0.0151; Df = 1 021). The equation for all years using the full ... regression model allowing for parallel lines for each year (F4.846 = 30.57, p < 0.001); including extra ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 117–123 : Автор(ы): Everson, I., B. Bendall and A. Murray

8. Preliminary report on biological observations and exploratory fishing data collected in the South Georgia area during the 1985/86 cruise of MT Carina

   georgianus, Notothenia gibberifrons and N. rossii marmorata. Scales and otoliths were also collected for age ... fish samples were taken for biological analysis. Random length measurements and detailed biological ... . georgianus was represented by three length groups: 20–24, 32–41 and 42–56 cm. N. gibberifrons was also ... represented by three length groups: 7–22/23, 22–31 and 31–49 cm. Weight/length ratios were calculated for all ... + Age groups (years) O~~==~,==~==~,===;~~,==~==~,==~~ Figure 8 20 30 40 ~ Total length (cm ... grcups (years) 200 O~~~I~~~I~~~I==~~I==~~ 20 3J 40 50 Total length (cm) Figure 7 Length and age ... (Figure 5). For comparison, unpublished age and length frequency distributions of the investigated ... _ , , , I I , I I i I I J j i nJ 19S5 / 86 (XII-U n 631 2 4 6 8 )) 12 Age groups (years) O ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 65-97 : Автор(ы): Kreft, K. and J. Szynaka

9. Krill population biology during the 1991 Chilean Antarctic krill fishery

   419 hauls. In Area A, a unimodal size frequency distribution was found; the size range was between 30 ... and 55 mm TL, with a mean TL of 45 mm for females and 48 mm for males. A very weak mode for juvenile ... spermatophore had a 36.5 mm TL, 80% of the females with spermatophores had a TL larger than 45 mm. In Area B, a ... TL (mean length 43 mm for females and 46 mm for males), and the other (modal length 32 mm) for ... between 30 and 55 mm TL, with a mean TL of 45 mm for females and 48 mm for males. A very weak mode for ... other (modal length 32 mm) for juvenile specimens between 20 and 39 mm TL. Females comprised 47.1 ... length mode of specimens between 30 and 55 mm TL, a mean TL of 45 mm for females and 48 mm for males ... ) for juvenile specimens (sex undetermined) between 20 and 39 mm TL (Figure 4). Females were also more ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 223–235 : Автор(ы): Mujica R., A., E. Acuña S. and A. Rivera O.

10. Otolith and body size relationships in bigeye grenadier (Macrourus holotrachys) in CCAMLR Subarea 48.3

    size models should be derived for each fish population under investigation. The length of fish chosen ... grenadier, Subarea 48.3 0 10 20 30 40 50 60 70 80 90 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 ... equations of the fi tted lines are given in the text. 90 80 70 60 50 40 30 20 10 0 40 35 30 ... from Heard and Macquarie Islands. 0 10 20 30 40 50 60 70 80 90 10 12 14 16 18 20 22 Otolith ... Length (mm) Fi sh T ot al L en gt h (c m ) 90 80 70 60 50 40 30 20 10 0 Fi sh to ta ...

    Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 133–143 : Автор(ы): Morley, S. and M. Belchier

Страницы