|Do two closely related petrel species have a different breeding strategy in Antarctica?
Creuwels, J.C.S. ; Franeker, J.A. van - \ 2003
In: Antarctic biology in a global context. / Huiskes, A.H.L., Gieskes, W.W.C., Rozema, J., Schorno, R.M.L., van der Vies, S.M., Wolff, W.J., Leiden : Backhuys - p. 144 - 147.
fauna - broedgedrag - ecologie - ornithologie - stormvogel - zuidpoolgebied - Antarctica
|Geografische variatie bij ganzen; deel 2 de oostelijke grauwe gans Anser anser rubrirostris
Bergh, L.M.J. van den - \ 2002
Vogeljaar 50 (2002)5. - p. 195 - 200.
avifauna - ecologie - ganzen - ornithologie - trekvogels
|Geografische variatie bij ganzen; deel 1 de Groenlandse kolgans Anser albifrons flavirostris
Bergh, L.M.J. van den - \ 2002
Vogeljaar 50 (2002)4. - p. 162 - 166.
avifauna - ecologie - ganzen - ornithologie - trekvogels
Aantallen eidereenden in en rond het Waddengebied in januari en maart 2002
Jong, M.L. de; Ens, B.J. ; Kats, R.K.H. - \ 2002
Wageningen : Alterra (Alterra-rapport 630) - 25
eenden - monitoring - inventarisaties - distributie - zoögeografie - nederland - waddenzee - ecologie - eidereend - fauna - kustzone - mosselperceel - ornithologie - vogeltelling - watervogels - Noordzee - ducks - monitoring - inventories - distribution - zoogeography - netherlands - wadden sea - fauna
Dit rapport beschrijft het resultaat van vliegtuigtellingen die in januari en maart 2002 werden gehouden om de aantallen en de verspreiding vast te stellen van de in Nederland overwinterende eidereenden Somateria mollissima. Alleen de Voordelta werd niet geteld. In januari 2002 werden 105 821 eidereenden geteld en in maart 2002 53 801. Ook de verspreiding van de eenden wordt beschreven. De dichtheden aan eidereenden in de Waddenzee zijn ten opzichte van het langjarig gemiddelde over de periode 1993-2001 sterk gedaald: op droogvallende platen met bijna 20%, op diep water met 57% en op en nabij mosselpercelen met 60%.
|European project on fulmars and marine litter: looking for help
Franeker, J.A. - \ 2002
Seabird Group Newsletter 92 (2002). - p. 1 - 3.
fauna - monitoring - ecologie - milieu - ornithologie - stormvogel - waterverontreiniging - zeevogels - zwerfvuil - Noordzee
Embryotoxic potential of persistent organic pollutants extracted from tissues of guillemots (Uria aalge) from the Baltic Sea and the Atlantic Ocean
Roode, D.F. de; Gustavsson, M.B. ; Rantalainen, A.L. ; Klomp, A.V. ; Koeman, J.H. ; Bosveld, A.T.C. - \ 2002
Environmental Toxicology and Chemistry 21 (2002)11. - ISSN 0730-7268 - p. 2401 - 2411.
ecotoxicologie - milieu - ornithologie - waterverontreiniging - zeevogels - Oostzee - Atlantische Oceaan
The Baltic Sea is a heavily polluted area. To assess the current contaminant pressure on the common guillemot (Uria aalge) living there, whole-body extracts of guillemots from the Baltic Sea were prepared and subdivided over six fractions, which differed in composition due to lipophilicity and polarity of the contaminants. The fractions were tested in the chicken embryo assay and compared to fractions of Atlantic guillemot extracts. Fertilized chicken eggs were injected with 0.03, 0.3, or 3 bird egg equivalents (BEQ) of the contaminants present in the fractions and then incubated for 19 d. Endpoints were selected to cover several mechanisms that may play a role in reproductive failures of fish-eating birds. Fractions I and IV from the Baltic guillemots induced ethoxyresorufin-O-deethylase (EROD) activity up to 15-fold in embryos exposed to 0.3 BEQ and up to 17-fold in embryos exposed to 3 BEQ. Corresponding Atlantic fractions induced EROD activity only at the higher dose of 3 BEQ. Morphological alterations were observed in the bursa of Fabricius in embryos exposed to the fractions that induced EROD, and for the Baltic fractions, this was apparent at the dose of 0.3 BEQ. The higher toxic potency of fractions I and IV was confirmed by higher mortality and occurrence of malformations among embryos exposed to these fractions. No other effects were observed; morphometry, hepatic porphyrin levels, thiamine-dependent enzymes, and acetylcholinesterase activity were not affected by any fraction. During interpretation of the results, concentrations in the whole-body guillemot extracts were compared to concentrations reported in field studies. In general, concentrations in the guillemot extract were lower than those associated with biomarker responses in other wild-bird species. However, because the relative sensitivity of guillemot toward immunotoxic effects remains to be resolved, effects on the immunocompetence of guillemot could not be excluded.
|Responses of seabirds, in particular prions (Pachyptila sp.), to small-scale processes in the Antarctic Polar Front
Franeker, J.A. van; Brink, N.W. van den; Bathmann, U.V. ; Pollard, R.T. ; Baar, H.J.W. de; Wolff, W.J. - \ 2002
Deep-Sea Research. Part II, tropical studies in oceanography (2002). - ISSN 0967-0645
fauna - ecologie - fauna - ornithologie - zeevogels - zuidpoolgebied - Antarctica
Small-scale distribution patterns of seabirds in the Antarctic Polar Front (APF) were investigated in relation to other biological, physical, and chemical features during the ANT-XIII/2 research cruise of R.V. Polarstern from December 1995 to January 1996. The APF is characterized by steep gradients in sea-surface temperature and salinity. Within the APF, gradient zones were closely associated with elevated levels of primary production, chlorophyll-a (chl-a) concentrations, and zooplankton densities.Even broad-billed prions (Pachyptila vittata group), which dominated the seabird community by 83% in carbon requirements, showed small-scale distributional patterns that were positively related to primary production, chl-a, and total zooplankton densities. The findings demonstrate a close, direct link between fine-scale physical processes in the APF and biological activity through several food web levels up to that of zooplankton-eating seabirds. Broad-billed prions appeared to forage on very small copepods (Oithona spp.) in close association with the front. Fish- and squid-eating predators showed poor correlations with small-scale spatial structures of the APF. However, in a wider band around the APF, most top predators did occur in elevated densitiesshowing gradual spatio-temporal diffusion of the impact of the APF on higher trophic levels.
Effects of an extract of oystercatcher (Haematopus ostralegus) eggs from the Zeehavenkanaal in the Netherlands, and of its major contaminant, hexachlorobenzene, on the chicken embryo
Roode, D.F. de; Klomp, A.V. ; Crum, S.J.H. ; Eggens, M. ; Bosveld, A.T.C. - \ 2002
Environmental Toxicology and Pharmacology 12 (2002)3. - ISSN 1382-6689 - p. 147 - 156.
fauna - ecotoxicologie - fauna - milieuverontreiniging - ornithologie - scholekster - watervogels - Zeehavenkanaal
Oystercatchers (Haematopus ostralegus) foraging on the Zeehavenkanaal canal in the Netherlands have been shown to accumulate appreciable amounts of contaminants, especially hexachlorobenzene. The present study was performed to assess the embryotoxic effects of the present contaminants. To this end, a two-step approach was followed. In step one, the toxic effects of hexachlorobenzene were studied in the chicken embryo bioassay, using concentrations realistic for the field situation. In step two, yolksof oystercatcher eggs were extracted and the embryotoxic potency of this extract was studied in the same bioassay, using doses of 1, 10 and 100% of the contaminant load in one average egg. The extract contained hexachlorobenzene and PCBs. However, presence of other compounds could not be excluded, since these were not analysed. Hexachlorobenzene induced a nonsignificant decrease in lymphocyte density in the bursa of Fabricius. The egg extract caused a 3.5 fold induction of EROD activity at the highest dose applied, and decreased lymphocyte density in the bursa of Fabricius.
|Site use by dark-bellied brent geese Branta bernicla bernicla on the Russian tundra as recorded by satellite telemetry: implications for East Atlantic flyway conservation
Green, M. ; Alerstam, T. ; Clausen, P. ; Drent, R. ; Ebbinge, B.S. - \ 2002
Wildlife Biology 8 (2002)3. - ISSN 0909-6396 - p. 229 - 239.
fauna - remote sensing - ecologie - fauna - ganzen - noordpoolgebied - ornithologie - telemetrie - trekvogels - Rusland - Siberië
In 1999, seven dark-bellied brent geese Branta bemicla bemicla were followed during spring migration from western Europe to Arctic Russia using satellite telemetry. For six of the birds we were also able to monitor their summer stay at the Taimyr Peninsula, and for five birds part of their autumn migration was recorded. In this article, we report on site use during summer and spring/autumn migration. We also describe migration routes and evaluate general migratory performance during autumn migration.All birds spent the summer within areas covered by the Great Arctic Reserve on the Taimyr Peninsula. None of the birds returned to the wintering area with young, so the sites used during summer were most likely used primarily for moulting. The birds remained at the same sites the whole summer until the start of autumn migration, indicating that the build-up of fuel stores for migration took place at the moulting sites. Autumn migration was conducted in a similar way as spring migration regarding routes and general migratory performance. Site use showed both a relatively large variation between individuals and seasons, as well as some degree of site fidelity as all birds returned for a longer stay in autumn to at least one of the areas they had used formore than two days in spring. Thus the migration of brent geese along the Arctic Ocean cannot be considered as a simple migration system with just a few key sites along the route, but instead it is a complex system with several localities used in different ways by different individuals. Most of the areas used by the satellite-tagged birds were previously known stopover areas, but some of them had not been recognized as being of importance to brent geese before. Most of the stopover areas do not have anykind of formal legal protection. It is suggested that further research should be carried out in the areas identified in this study to evaluate their importance and role in the migratory journeys of dark-bellied brent geese.
|Vogels en het Interprovinciaal Windpark Afsluitdijk; beoordeling effecten van het Nuon IPWA-alternatief
Dirksen, S. ; Spaans, A.L. - \ 2002
Culemborg : Bureau Waardenburg (Rapport 02-015) - 34 p.
broedvogels - ecologie - fauna - ornithologie - watervogels - windmolenpark - Friesland - Noord-Holland - Afsluitdijk - Waddenzee - IJsselmeer - fauna
|Lijnopstellingen van windturbines geen barriOre voor voedselvluchten van meeuwen en sterns in de broedtijd
Bergh, L.M.J. van den; Spaans, A.L. ; Swelm, N.D. van - \ 2002
Limosa 75 (2002). - ISSN 0024-3620 - p. 25 - 32.
broedvogels - ecologie - fauna - ornithologie - watervogels - windmolenpark - windturbine - Zuid-Holland - Maasvlakte - fauna
Vogels van het boerenland: regionale verschillen
Teunissen, W.A. ; Schekkerman, H. - \ 2002
De Levende Natuur (2002). - ISSN 0024-1520
vogels - biogeografie - fauna - nederland - weidevogels - agrarisch natuurbeheer - ecologie - landbouw - ornithologie - birds - biogeography - fauna - netherlands - grassland birds
Resultaten van het nationaal weidevogelnetwerk, waarin samenwerken CBS, SOVON, Vogelonderzoek Nederland en de provincies, met subsidies van LNV
|Vluchtstroken voor gruttogezinnen; werken ze?
Schekkerman, H. - \ 2002
Nieuws van Waterland 5 (2002). - p. 10 - 11.
agrarisch natuurbeheer - ecologie - fauna - grasland - grutto - landbouw - ornithologie - weidebouw - weidevogels - Noord-Holland - Waterland - fauna
|Voorstudie vogelecologische modellering Noordzee
Baveco, J.M. - \ 2002
Wageningen : Alterra - 25 p.
ecologie - fauna - ornithologie - simulatiemodellen - zeevogels - Noordzee - fauna
Feeding ecology of wintering terns in Guinea-Bissau
Brenninkmeijer, A. ; Stienen, E.W.M. ; Klaassen, M. ; Kersten, M. - \ 2002
Ibis 144 (2002)4. - ISSN 0019-1019 - p. 602 - 613.
fauna - ecologie - fauna - ornithologie - stern - zeevogels - Afrika - Guinee-Bissau
We studied the feeding ecology of little tTerns Sterna albifrons, sandwich terns S. sandvicensis and royal terns S. maxima in the Archipélago dos Bijagós (11°40'N, 15°45'W) in Guinea-Bissau (West Africa) during the winter of 1992/1993. More than 95 of all prey taken by these terns were roundfish, ranging in weight from 0.3 to 40 g. Birds usually fed alone, but sometimes they were observed feeding in mixed-species flocks consisting of 15-200 individuals. Capture rate (n fish per hour foraging) in these flocks was higher than that of solitary birds. However, smaller fish were caught by birds foraging in flocks, so food intake rate (g/h) did not differ between solitary and flock-feeding birds. The relationships between foraging behaviour of the three tern species and abiotic factors, such as time, tide and water clarity, have been investigated. Capture rate of royal terns increased with water clarity. For little terns and sandwich terns, food intake rate was lower in the most turbid waters compared to clearer waters. There was very little foraging activity during high tide. For little terns and royal terns, food intake rate was about twice as high during receding and low tides as during an incoming tide. Food intake rate averaged 8 g/h in little terns, 60 g/h in sandwich terns and 45 g/h in royal terns. With a rough model, we estimate the maximum rate of daily energy expenditure of terns wintering in the tropics at 3 x BMR (defined as energy expenditure of inactive bird at thermoneutrality in a post-absorptive state during the resting phase of the daily cycle). From an energetic viewpoint, wintering sandwich terns in Guinea-Bissau seem to have an easy living.
Variation in growth in sandwich tern chicks Sterna sandvicensis and the consequences for pre- and post-fledging mortality
Stienen, E.W.M. ; Brenninkmeijer, A. - \ 2002
Ibis 144 (2002)4. - ISSN 0019-1019 - p. 567 - 576.
fauna - ecologie - fauna - ornithologie - stern - zeevogels - Waddenzee - Griend
Fitness consequences of variation in body mass growth and body condition were studied in a sandwich tern Sterna sandvicensis colony on Griend, Dutch Wadden Sea, during 1990-2000. Body mass increment during the linear growth phase predicted nestling survival probabilities accurately. Chicks growing less than 8 g per day had low survival probabilities until fledging, but within a range of 8-11 g per day growth only small effects on chick survival were observed. Effects of slow growth on survival becameobvious after about 10 days after hatching. Slow growing chicks reached a much lower fledging mass, whereas slow growth had only small effects on structural size at fledging. Body condition of the chicks was highly variable and had strong effects on survival until fledging. However, body condition during the nestling stage did not influence post-fledging survival. Body condition at fledging had no effects on post-fledging survival and did not affect final mass or body size. It is argued that low fledging mass can be overcome soon after fledging, as parents take their fledglings closer to the foraging areas, thereby avoiding high rates of kleptoparasitism by black-headed gulls Larus ridibundus.
|Numbers and distribution of wintering waterbirds in the Western Palearctic and Southwest Asia in 1997, 1998 and 1999; results from the international waterbird census
Gilissen, N. ; Haanstra, L. ; Delany, S. ; Boere, G. ; Hagemeijer, W. - \ 2002
Wageningen : Wetlands International - ISBN 9789058820112 - 182
vogels - watervogels - monitoring - inventarisaties - overwintering - zuidwest-azië - ecologie - fauna - ornithologie - trekvogels - Europa - Azië - Noord-Afrika - birds - waterfowl - monitoring - inventories - overwintering - south west asia - fauna
|Treedt er stuwing op tijdens nachtelijke seizoenstrek van vogels over de Afsluitdijk? Veldonderzoek naar hoogteverdelingen en horizontale gradiënten
Poot, M.J.M. ; Winden, J. van der; Schekkerman, H. ; Lieshout, S.M.J. van; Dirksen, S. - \ 2002
Culemborg : Bureau Waardenburg (Rapport 02-005) - 75 p.
ecologie - fauna - ornithologie - vogeltrek - Afsluitdijk - IJsselmeer - fauna
Perspectief voor de grauwe gans als broedvogel in het Deltagebied bij verschillende beheermaatregelen
Ebbinge, B.S. ; Klok, T.C. ; Schekkerman, H. ; Turnhout, C. van; Voslamber, B. ; Willems, F. - \ 2002
De Levende Natuur (2002). - ISSN 0024-1520
anser - ganzen - begrazing - weiden - agrarische bedrijfsvoering - oogstverliezen - schadelijke dieren - zuid-holland - zeeland - zuidwest-nederland - broedvogels - ecologie - natuurbeheer - ornithologie - anser - geese - grazing - pastures - farm management - yield losses - noxious animals - zuid-holland - zeeland - south-west netherlands
Onderzoek in opdracht van Zeeland, Zuid-Holland, Noord-Brabant, Natuurmonumenten en Staatsbosbeheer. Onderzocht is met welke maatregelen de overlast van begrazing door ganzen voor boeren te beperken is
|Density dependent population limitation in dark-bellied brent geese Branta b. bernicla
Ebbinge, B.S. ; Heesterbeek, J.A.P. ; Ens, B.J. ; Goedhart, P.W. - \ 2002
Avian Science 2 (2002)2. - p. 63 - 75.
fauna - lemming - ecologie - ganzen - noordpoolgebied - ornithologie - trekvogels - zoogdieren - Rusland - Siberië