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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    Records 1 - 9 / 9

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    Demography of European Honey Buzzards Pernis apivorus
    Bijlsma, R.G. ; Vermeulen, M. ; Hemerik, L. ; Klok, C. - \ 2012
    Ardea 100 (2012)2. - ISSN 0373-2266 - p. 163 - 177.
    migrating raptors - population trends - hawk-mountain - birds - age - pennsylvania - satellite - abundance - recovery - forests
    We set out to explore whether changes in fecundity and survival (or both) of European Honey Buzzards were associated with trends observed in The Netherlands. We used standardized monitoring data on numbers and reproduction from several study plots in The Netherlands over the period of 1974–2005. Survival estimates were based on recoveries of Honey Buzzards ringed throughout Europe (collated by EURING and individual ringing stations). Based on these values we computed the annual population growth rate with a time invariant population model, and used elasticity analysis to detect the parameter with the strongest influence on growth rate. Lambda was smaller than 1, suggesting a population decline, but confidence intervals around lambda were relatively wide. Elasticity of adult survival was much higher than of any other life history parameter, indicating that adult survival has potentially the greatest impact on annual population growth. Because data on reproduction varied strongly we estimated a 95% confidence interval for annual population growth by bootstrapping the reproduction data. Furthermore, we analysed the influence of stochastic food availability (i.e. wasp abundance) on reproduction, and through this demographic factor, on the population trend. The stochastic model suggests a clear population decline, which is consistent with observed declines across much of northern and western Europe (including The Netherlands). For the growth rate ¿ to reach 1, a reproductive output of 1.16 young per pair was calculated to be necessary, much higher than the 0.53–0.88 found in two study sites in The Netherlands.
    Avian population consequences of climate change are most severe for long-distance migrants in seasonal habitats.
    Both, C. ; Turnhout, C.A.M. van; Bijlsma, R.G. ; Siepel, H. ; Strien, A.J. van; Foppen, R.P.B. - \ 2010
    Proceedings of the Royal Society. B: Biological Sciences 277 (2010). - ISSN 0962-8452 - p. 1259 - 1266.
    warblers acrocephalus-schoenobaenus - west-african rainfall - winter moth - species richness - migratory birds - pedunculate oak - parus-major - great tits - declines - abundance
    One consequence of climate change is an increasing mismatch between timing of food requirements and food availability. Such a mismatch is primarily expected in avian long-distance migrants because of their complex annual cycle, and in habitats with a seasonal food peak. Here we show that insectivorous long-distance migrant species in The Netherlands declined strongly (1984–2004) in forests, a habitat characterized by a short spring food peak, but that they did not decline in less seasonal marshes. Also, within generalist long-distance migrant species, populations declined more strongly in forests than in marshes. Forest-inhabiting migrant species arriving latest in spring declined most sharply, probably because their mismatch with the peak in food supply is greatest. Residents and short-distance migrants had non-declining populations in both habitats, suggesting that habitat quality did not deteriorate. Habitat-related differences in trends were most probably caused by climate change because at a European scale, long-distance migrants in forests declined more severely in western Europe, where springs have become considerably warmer, when compared with northern Europe, where temperatures during spring arrival and breeding have increased less. Our results suggest that trophic mismatches may have become a major cause for population declines in long-distance migrants in highly seasonal habitats
    Minder trekvogels in bos door klimaatverandering
    Both, C. ; Turnhout, C.A.M. van; Bijlsma, R.G. ; Siepel, H. ; Strien, A.J. van; Foppen, R.P.B. - \ 2009
    Nature Today 2009 (2009)19-12.
    Vervolging van roofvogels in 2007
    Bijlsma, R.G. ; Zoun, P.E.F. - \ 2008
    De Takkeling 16 (2008)1. - ISSN 1380-3735 - p. 56 - 64.
    Vervolging van roofvogels in Nederland in 2006
    Bijlsma, R.G. ; Zoun, P.E.F. - \ 2007
    De Takkeling 15 (2007). - ISSN 1380-3735 - p. 39 - 37.
    Roofvogels bedreigd
    Bijlsma, R.G. ; Jansman, H.A.H. - \ 2007
    Dier en milieu : vakblad voor handhavers op het gebied van dierenbescherming, natuurbehoud en milieubeheer 82 (2007)1. - ISSN 1574-8405 - p. 12 - 15.
    Vervolging van roofvogels in Nederland in 2004
    Bijlsma, R.G. ; Zoun, P.E.F. - \ 2005
    De Takkeling 13 (2005)1. - ISSN 1380-3735 - p. 57 - 64.
    De invloed van neerslag op conditie, rui en overlevingskansen van bboerenzwaluwen in zuidelijk Afrika
    Brink, B. van der; Have, T.M. van der; Bijlsma, R.G. - \ 2004
    Limosa 77 (2004)2-3. - ISSN 0024-3620 - p. 109 - 120.
    hirundo rustica - vogels - migratie - overwintering - neerslag - regen - ruien - lichaamsconditie - gewicht - lichaamsgewicht - populatiedichtheid - populatiedynamica - overleving - mortaliteit - habitats - rustplaatsen - habitat vernietiging - populatie-ecologie - dierecologie - botswana - hirundo rustica - birds - migration - overwintering - precipitation - rain - moulting - body condition - weight - body weight - population density - population dynamics - survival - mortality - habitats - resting places - habitat destruction - population ecology - animal ecology - botswana
    Van 1992 tot 1995 is in het kader van het Botswana Swallow Project onderzoek gedaan naar de overleving van boerenzwaluwen in hun overwinteringsgebied in Botswana. Door de grote jaarlijkse verschillen in neerslag was het mogelijk het effect van neerslag op de conditie en rui van adulte en juveniele boerenzwaluwen, en daarmee op de overleving, te bestuderen. Variaties in neerslag blijken een belangrijke invloed te hebben op de hoeveelheid insecten en als gevolg daarvan op de beschikbaarheid van voedsel en de overlevingskansen, vooral van juvenielen. Bij droogte kan massale sterfte optreden. Ook blijkt neerslag van invloed op de snelheid van de rui, en daarmee op de overlevingskansen tijdens de trek. Naast de neerslag blijkt de beschikbaarheid van goede en veilige mega-slaapplaatsen van belang voor de overleving. De snelle menselijke exploitatie en vernietiging van geschikte overwinteringsgebieden vormen mogelijk een grotere bedreiging voor de boerenzwaluw dan de variaties in neerslag
    European Swallows Hirundo rustica in Botswana during three non-breeding seasons: the effects of rainfall on moult
    Have, T.M. van der; Bijlsma, R.G. ; Brink, B. van der - \ 2000
    Ostrich 71 (2000)1-2. - ISSN 0030-6525 - p. 198 - 204.
    tails - birds
    The rate of moult of European Swallows spending the non-breeding season in Botswana was studied during December-January of 1992/93, 1993/94 and 1994/95 to investigate the effects of variability in rainfall and roosting habitat availability. In January 1994, 2-3 million European Swallows were counted at a traditional roost along the Boteti River. The rate of moult was relatively slow, about one feather (primary, secondary or tail feather) was replaced every two weeks in both adults and juveniles. The speed of moult in juveniles was generally lower than in adults, in particular of secondaries and tail feathers. Moulting rate of both primaries and tail feathers was lowest in 1994/95 during a period of drought and coincided with the almost complete destruction of roosting habitat. In 1992/93, moulting rate was highest when rainfall was moderate and roosting habitat abundant. Moulting rate was intermediate in 1993/94 when rainfall was frequent but roosting habitat reduced because of the low water level in the Boteti River. The combined effect of reduced food availability during droughts and higher densities and longer foraging flights when roosting habitat is scarce might explain the annual variation in moulting rate. From the second week of January onwards many adults started moulting the outermost tail feather before the penultimate feathers. This phenomenon could indicate the importance of long tail streamers in aerial manoeuvring when foraging during the return migration to the breeding grounds.
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