Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    In-situ observations using tagged animals
    Roquet, F. ; Boehme, L. ; Bester, M.N. ; Bornemann, H. ; Brasseur, S.M.J.M. ; Charrassin, J.B. ; Costa, D. ; Fedak, M.A. ; Guinet, C. ; Hall, A. ; Harcourt, R. ; Hindell, M.A. ; Kovacs, K.M. ; Lea, M.A. ; Lovell, P. ; Lowther, A. ; Lyderson, C. ; Mcmahon, C. ; Picard, B. ; Reverdin, G. ; Vincent, C. - \ 2017
    - 5 p.
    Marine mammals help gather information on some of the harshest environments on the planet, through the use of miniaturized ocean sensors glued on their fur. Since 2004, hundreds of diving marine animals, mainly Antarctic and Arctic seals, have been fitted with a new generation of Argos tags developed by the Sea Mammal Research Unit of the University of St Andrews in Scotland, UK. These tags investigate the at-sea ecology of these animals while simultaneously collecting valuable oceanographic data. Some of the study species travel thousands of kilometres continuously diving to great depths (up to 2100 m). The resulting data are now freely available to the global scientific community at http://www.meop.net. Despite great progress in their reliability and data accuracy, the current generation of loggers while approaching standard ARGO quality specifications have yet to match them. Yet, improvements are underway; they involve updating the technology, implementing a more systematic phase of calibration and taking benefit of the recently acquired knowledge on the dynamical response of sensors. Together these efforts are rapidly transforming animal tagging into one of the most important sources of oceanographic data in polar regions and in many coastal areas
    When diving animals help us to observe the oceans: the MEOP data portal
    Roquet, F. ; Boehme, L. ; Bester, M.N. ; Bornemann, H. ; Brasseur, S.M.J.M. ; Charrassin, J.B. ; Costa, D. ; Fedak, M.A. ; Guinet, C. ; Hall, A. - \ 2016
    Prey habitat model outperforms prey data in explaining grey seal distribution
    Aarts, G.M. ; Jones, E. ; Brasseur, S.M.J.M. ; Rindorf, A. ; Smout, S.C. ; Dickey-Collas, M. ; Wright, P. ; Russell, D. ; McConnell, B.J. ; Kirkwood, R.J. ; Fedak, M. ; Matthiopoulos, J. ; Reijnders, P.J.H. - \ 2014
    Movements and foraging areas of naove, recently weaned southern elephant seal pups
    McConnell, B. ; Fedak, M. ; Burton, H.R. ; Engelhard, G.H. ; Reijnders, P.J.H. - \ 2002
    Journal of Animal Ecology 71 (2002)1. - ISSN 0021-8790 - p. 65 - 78.
    fauna - remote sensing - Macquarie - ecologie - fauna - zeezoogdieren - zuidpoolgebied - Grote Oceaan - Macquarie
    1. Female southern elephant seals (Mirounga leonina L. ) expend variable, often large, amounts of their stored body resources on their pups during lactation. There is some evidence that pups with higher weaning masses have a better chance of survivingtheir first year. But in order to understand what level of maternal investment is required to produce successful pups, we need to understand the behaviour and problems faced by naove pups before nutritional independence. :2. We used satellite telemetry to track 30 newly weaned pups on their first trip to sea from their natal site at Macquarie Island in 1995 and 1996. Track duration varied from 2 to 179 (mean, 77) days. Seven seals were tracked for the entire duration oftheir first trip. :3. The movements were grouped into three phases. Phase 1 (mean duration 30 days) was characterized by rapid and directed dispersal from Macquarie Island at daily travel rates of up to 140 km d-1. Phase 2 (mean duration 67 days) consisted of slower travel rates (generally < 20 km d-1) where activity was often centred on localized patches up to 1900 km from Macquarie Island. This phase was sometimes interrupted by bouts of increased travel rate as the seal moved to another patch. Phase 3 (mean duration 42 days) consisted of prolonged increased travel rates as the seals returned to Macquarie or, in one case, Chatham Island. :4. The routes of the tracks to the south-east were very similar. Simulated tracks based on a constant heading of magnetic east, at variable swimming speed, and modified by ocean current vectors produced a pattern similar to, but not identical to, the south-east tracks. The tracks to the west and south were more diverse and meandering. :5. Based on a nearest neighbour analysis, neither sex, year nor weaning mass influenced Phase 1-2 or Phase 2-3 transition locations. :6. Phase 2 tracks were associated in the south-eastern group with the Pacific Antarctic Ridge and in the south-west group, to a lesser extent, with the Indian Antarctic Ridge. The southern limits of Phase 2 tracks in the south-eastern group aligned with the southern Antarctic Circumpolar Circulation front. :7. Using calculated estimates of body composition at weaning and estimates of the rate of utilization of body reserves for the period before animals reach phase 2 of their trip, we estimate that large pups will have reserves remaining to supply their needs whereas pups in the small group are approaching critical limits. However, these estimates are based on several assumptions and extrapolations. More information on body composition of pups at weaning and departure is needed along with behavioural information to clarify the value of maternal expenditure in terms of offspring survival.
    A method for determining the habitat preference of British Grey Seals (Halychoerus grypus)
    Aarts, G. ; Matthiopoulos, J. ; McConnel, B. ; Fedak, M. ; Wieren, S.E. van - \ 2001
    Unknown Publisher - 38 p.
    Environmental and physiological determinants of successful foraging by naive southern elephant seal pups during their first trip to sea
    Hindell, M.A. ; McConnell, B.J. ; Fedak, M.A. ; Slip, D.J. ; Burton, H.R. ; Reijnders, P.J.H. ; McMahon, C.R. - \ 1999
    Canadian Journal of Zoology 77 (1999)11. - ISSN 0008-4301 - p. 1807 - 1821.
    The ability to forage successfully during their first trip to sea is fundamental to the ultimate survival of newly weaned southern elephant seals (Mirounga leonina). However, there is considerable variation in the body mass and fat content of seal pups at weaning, which results in some individuals having larger energy and oxygen stores than others, which may confer advantages on them. The diving behaviour of 21 newly weaned seals was studied using satellite relayed data loggers. Seals were captured at Macquarie Island in December 1995 and 1996, approximately 4 weeks after weaning. Two groups of seals were specifically targeted: a heavy group from the top quartile of weaning masses (n = 6) and a light group from the lower quartile (n = 15). Most of the seals made dives in excess of 100 m depth and 5 min before final departure from the island. However, for the first 60-80 d, all of the seals exhibited behaviour quite distinct from the patterns reported for older conspecifics, and made relatively shallow (100 +/- 39 m; mean +/- SD) and short (5.7 +/- 1.23 min) dives. During this time the seals spent 74.3 +/- 12.6 of each day diving, and the depth of the dives did not follow any diurnal pattern. The diving behaviour of all seals changed abruptly whenthey started on their return to land. During this time their behaviour was more like that of adults: they made deeper (159 +/- 9 m) and longer dives (9.01 +/- 1.69 min) than previously, and the dives showed a strong diurnal pattern in depth. There is no obvious explanation for this change in behaviour, although its abrupt nature suggests that it is unlikely to have been due to physiological changes in the seals. The size of the seals at weaning was an important influence on diving behaviour. Heavy weaners made significantly deeper (130 +/- 40 m) and longer dives (7.36 +/- 0.55 min) than light weaners (88 +/- 32 m and 5.04 +/- 0.64 min, respectively). This indicates that smaller seals are constrained to some extent by their physiological capabilities, which perhaps requires some individuals to adopt different foraging strategies. VA:IBN
    Diving behaviour in newly weaned southern elephant seals during their first trip to sea
    Hindell, M.A. ; McConnell, B.J. ; Slip, D.J. ; Fedak, M.A. ; Burton, H.R. ; Reijnders, P.J.H. - \ 1998
    In: World marine mammal science conference, Monaco, January, 1998
    Close encounters of four kinds: movement patterns of recently weaned elephant seal pups from Macquarie Isands
    Fedak, M.A. ; McConnell, B.J. ; Slip, D.J. ; Hindell, M.A. ; Reijnders, P.J.H. ; Burton, H.R. - \ 1998
    In: World marine mammal science conference, Monaco, January 1998
    Diving behaviour in newly weaned southern elephant seals during their first trip to sea
    Hindell, M.A. ; McConnell, B.J. ; Slip, D.J. ; Fedak, M.A. ; Burton, H.R. ; Reijnders, P.J.H. - \ 1998
    In: Abstract. World Marine Mammal Science Conference, Monaco, January
    Close encouters of four kinds: movement patterns of recently weaned elephant seal pups from Macquarie Isands
    Fedak, M.A. ; McConnell, B.J. ; Slip, D.J. ; Hindell, M.A. ; Reijnders, P.J.H. ; Burton, H.R. - \ 1998
    In: Abstract. World Marine Mammal Science Conference, Monaco, January 1998
    Effect of disturbance on pup weaning mass in Southern Elephant Seals. Abstract
    Engelhard, G.H. ; Brasseur, S.M.J.M. ; Hall, A.J. ; Slip, D.J. ; Burton, H.R. ; Fedak, M.A. ; Reijnders, P.J.H. - \ 1998
    In: World Marine Mammal Science Conference, Monaco, January 1998
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