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  • 1. Barboutis, Christos
    et al.
    Henshaw, Ian
    Stockholm University, Faculty of Science, Department of Zoology.
    Mylonas, Moisis
    Fransson, Thord
    Seasonal differences in energy requirements of Garden Warblers Sylvia borin migrating across the Sahara desert2011In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 153, no 4, p. 746-754Article in journal (Refereed)
    Abstract [en]

    The Sahara desert acts as an ecological barrier for billions of passerine birds on their way to and from their African wintering areas. The Garden Warbler Sylvia borin is one of the most common migrants involved. We used body mass of this species from Greece in autumn and spring to simulate the desert crossing and to assess how body mass relates to fuel requirement. The flight range estimates were adjusted to the seasonal extent of the desert, 2200 km in autumn and about 2800 km in spring. In autumn, with an average fuel load of about 100% of body mass without fuel, birds were not able to cross the desert in still air, but northerly winds prevail during September and with the average wind assistance only one in 14 was predicted to fail to make the crossing. Body mass data from spring, after the desert crossing, was used to estimate departure body mass from south of the desert. The average wind assistance in spring is close to zero and departure body mass of the average bird arriving at Antikythira, a small Greek island, under such conditions was estimated to be 34.6 g, which corresponded to a fuel load of 116%. Calculations based on 1% body mass loss per hour of flight showed slightly larger body mass loss than that calculated from flight range estimates. The results suggest that passerine birds about to cross the eastern part of the Sahara desert need to attain a larger fuel load in spring than in autumn.

  • 2. Cross, Adam D. P.
    et al.
    Hentati-Sundberg, Jonas
    Stockholm University, Faculty of Science, Stockholm Resilience Centre.
    Österblom, Henrik
    Stockholm University, Faculty of Science, Stockholm Resilience Centre.
    McGill, Rona A. R.
    Furness, Robert W.
    Isotopic analysis of island House Martins Delichon urbica indicates marine provenance of nutrients2014In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 156, no 3, p. 676-681Article in journal (Refereed)
    Abstract [en]

    The presence of one of the largest colonies of House Martins in Europe on the small island of Stora Karlso, Sweden, led us to investigate the source of their food by analysis of stable isotopes of carbon and nitrogen. Carbon isotopic values of House Martin nestlings were the same as those of Common Guillemot Uria aalge nestlings fed on marine fish, but differed from local Collared Flycatcher Ficedula albicollis nestlings fed on woodland insects. We infer that these House Martins fed their chicks almost exclusively on insects that had used nutrients derived from seabirds, indicating a dependence on the presence of a large seabird colony. We suggest by extension that some populations of island passerines of high conservation importance may also be dependent on nutrient subsidies from seabird colonies.

  • 3. Helbig, Andreas J.
    et al.
    Knox, Alan G.
    Parkin, David T.
    Sangster, George
    Stevenshof 17, 2312 G Leiden, the Netherlands.
    Collinson, Martin
    Guidelines for assigning species rank2002In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 144, no 3, p. 518-525Article in journal (Refereed)
    Abstract [en]

    Developments in several fields of study (including bio-acoustics and the analysis of DNA) together with reappraisals of the nature of species have impacted significantly on avian taxonomy. The BOU’s Taxonomic Subcommittee has developed guidelines for the applicationof species limits to sympatric, parapatric, allopatric and hybridizing taxa. These are published here to assist researchers understand the rationale behind the committee’s taxonomic recommendations relating to the British List.

  • 4. Irestedt, Martin
    et al.
    Gelang, Magnus
    Stockholm University, Faculty of Science, Department of Zoology.
    Sangster, George
    Stockholm University, Faculty of Science, Department of Zoology.
    Olsson, Urban
    Ericson, Per
    Stockholm University, Faculty of Science, Department of Zoology.
    Alström, Per
    Neumann’s Warbler Hemitesia neumanni (Sylvioidea): the sole African member of a Palaeotropic Miocene avifauna2011In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 153, no 1, p. 78-86Article in journal (Refereed)
    Abstract [en]

    We present molecular evidence that Neumann’s Warbler Hemitesia neumanni is deeply nested within the Cettiidae. The species’ distribution in the Albertine Rift of East Africa is intriguing, as the family Cettiidae is principally an Asian radiation. This disjunct distribution could be a result of colonization of Africa by long-distance dispersal, or the Cettiidae may at some point in the past have had a much larger geographical distribution that also covered parts of Africa.

  • 5.
    Kadin, Martina
    et al.
    Stockholm University, Faculty of Science, Stockholm Resilience Centre.
    Olsson, Olof
    Stockholm University, Faculty of Science, Stockholm Resilience Centre.
    Hentati-Sundberg, Jonas
    Stockholm University, Faculty of Science, Stockholm Resilience Centre.
    Willerström Ehrning, Ebba
    Blenckner, Thorsten
    Stockholm University, Faculty of Science, Stockholm Resilience Centre.
    Common Guillemot Uria aalge parents adjust provisioning rates to compensate for low food quality2016In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 158, no 1, p. 167-178Article in journal (Refereed)
    Abstract [en]

    The quantity and quality of food available within the foraging area set important constraints for chick-rearing birds, but responses to low quality are not well understood. This study explored the potential for parent birds to adjust quantity (feeding rate) and quality (energy content) in chick provisioning, by studying Common Guillemots Uria aalge on Stora Karlso, Baltic Sea, predominantly utilizing Sprat Sprattus sprattus, during conditions of high food quantity but reduced food quality. Quality is central to reproductive success in this single-prey loader. From the chick's perspective, provisioning rates should be increased to compensate for low food quality and to fulfil its growing needs with increasing age. However, the high energy cost of flying in Guillemots makes it important for parent birds to minimize commutes to feeding areas. Provisioning parameters were recorded during three dawn-to-dusk watches each breeding season from 2005 to 2013, when clupeids, presumably Sprat, constituted 98% of chick diet. Generalized additive mixed models showed that both feeding rate and size of clupeids (a proxy for energy content) varied between years and changed non-linearly with chick age, but that there was no change within breeding seasons. Chick age and year explained 36% of the variation in feeding rate but only 2% of the variation in the size of clupeids in chick diets. We conclude that parent birds tried to adjust both feeding rate and prey size, but were less successful with the latter. A strong negative correlation was found between annual feeding rates and size of clupeids, evaluated as the differences relative to the baseline year, and adjusted for the effects of chick age. Although the differences between years were small, the relationship indicates a compensation mechanism that does not seem to impact adult survival, and by which increased feeding rates can partly counteract reduced chick energy intake when food quality is low.

  • 6. Knox, Alan G.
    et al.
    Collinson, J. Martin
    Parkin, David T.
    Sangster, George
    Svensson, Lars
    Taxonomic recommendations for British birds, Fifth Report2008In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 150, p. 833-835Article in journal (Other academic)
  • 7. Laczi, Miklos
    et al.
    Balogh, Julia
    Stockholm University, Faculty of Science, Department of Zoology. Eötvös Loránd University, Hungary.
    Nardou, Xavier
    Torok, Janos
    Hegyi, Gergely
    The meaning of purely structural colour: white plumage reflectance indicates feather condition2021In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 63, no 2, p. 407-416Article in journal (Refereed)
    Abstract [en]

    White plumage areas are widespread among birds but the mechanisms generating individual differences in white feather reflectance are poorly known. Additionally, the proximate mechanisms of within-season feather colour changes in general are also poorly known. Here we explored within-individual changes in macrostructure and reflectance of the white wing-patch of female Collared Flycatchers Ficedula albicollis using data from three stages within a breeding season. Changes in brightness and UV chroma were related to changes in the neatness and size of reflective surfaces, respectively. This suggests that white feather reflectance traits may act as indicators of feather intactness and preening activity.

  • 8.
    Lind, Johan
    Stockholm University, Faculty of Science, Department of Zoology, Ethology.
    Book review of Wings over Falsterbo, 2004, (ed) L. Karlsson2005In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 147, p. 428-Article, book review (Other (popular science, discussion, etc.))
  • 9.
    Nyström, Jesper
    et al.
    Stockholm University, Faculty of Science, Department of Zoology.
    Ekenstedt, Johan
    Engström, Johan
    Angerbjörn, Anders
    Stockholm University, Faculty of Science, Department of Zoology.
    Gyr falcons, ptarmigan and microtine rodents in Northern Sweden2005In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 147, no 3, p. 587-597Article in journal (Refereed)
    Abstract [en]

    A Gyr Falcon Falco rusticolus population in Northern Sweden (66°N, 17°E) was monitored from 1996 to 2002 in relation to its predator–prey interactions with its main and alternative prey species. Ptarmigan species Lagopus spp., and especially Rock Ptarmigan L. mutus, were the Gyr Falcons’ most important prey and constituted more than 90% of the prey biomass. A 21-fold difference in ptarmigan abundance was found across Falcon breeding territories. However, this great variation in prey availability corresponded to only about a 10% shift in Gyr Falcon diet across territories, suggesting that the Falcons were reluctant or unable to compensate for declining ptarmigan availability by using alternative prey categories. Gyr Falcons did not respond functionally to microtine rodent abundance. Their diets were unaffected by a peak in the microtine rodent population cycle when Norwegian Lemmings Lemmus lemmus occurred in high numbers in the study area. Gyr Falcons responded numerically to their prey in two ways. First, there was a reproductive response with a significant relationship between the number of chicks fledged and the number of ptarmigan in the breeding territories. Secondly, although the Gyr Falcons did not utilize microtines as prey, there was a relationship between the microtine rodent abundance and the number of pairs that attempted to breed each year. This could be a result of an indirect community interaction, assuming that other predators switched from ptarmigan to microtines as prey, which could have had a positive effect on the breeding performance of the Gyr Falcons. The Gyr Falcons acted as true specialist predators, and their narrow food niche probably reflected a general lack of suitable alternative prey in the study area.

  • 10.
    Sangster, George
    Leiden, The Netherlands.
    A name for the flamingo–grebe clade2005In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 147, no 3, p. 612-615Article in journal (Refereed)
  • 11.
    Sangster, George
    Stockholm University, Faculty of Science, Department of Zoology.
    Cleere, N. Nightjars, Potoos, Frogmouths, Oilbird and Owlet-nightjars of the World. Maidenhead: WildGuides, 20102012In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 154, no 1, p. 219-219Article, book review (Other academic)
  • 12.
    Sangster, George
    Leiden, The Netherlands.
    Genetic distance as a test of species boundaries in the Citril Finch Serinus citrinella: a critique and taxonomic reinterpretation.2000In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 142, no 3, p. 487-490Article in journal (Refereed)
  • 13.
    Sangster, George
    Stockholm University, Faculty of Science, Department of Zoology.
    Mikkola, H. Owls of the World: a photographic guide. London: Christopher Helm, 20122013In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 155, no 3, p. 691-692Article, book review (Other academic)
  • 14.
    Sangster, George
    Stockholm University, Faculty of Science, Department of Zoology, Systematic Zoology.
    Review of: Festschrift for Ned Johnson: Geographic variation and evolution in birds by C Cicero and J V Remsen.2008In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 150, p. 843-Article, book review (Other academic)
  • 15.
    Sangster, George
    Stockholm University, Faculty of Science, Department of Zoology, Systematic Zoology.
    Review of: Systematic notes on Asian birds 2010 by D R Wells.2011In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 153, p. 452-453Article, book review (Other academic)
  • 16.
    Sangster, George
    et al.
    Stockholm University, Faculty of Science, Department of Zoology, Systematic Zoology. Swedish Museum of Natural History, Sweden.
    Collinson, J. Martin
    Crochet, Pierre-Andre
    Kirwan, Guy M.
    Knox, Alan G.
    Parkin, David T.
    Votier, Stephen C.
    Taxonomic recommendations for Western Palaearctic birds: 10th report2015In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 157, no 1, p. 193-200Article in journal (Refereed)
    Abstract [en]

    This paper is the tenth report of the Taxonomic Sub-Committee of the BOU Records Committee. Species-level decisions are based on criteria outlined by Helbig et al. (2002). The ninth report of the Sub-Committee was published by Sangster et al. (2013). Recommendations in this report fall into five categories: (i) recognition of higher taxa not recognised by Voous (Paroidea), (ii) changes in generic allocation (Melanocorypha leucoptera, Calandrella rufescens), (iii) changes in the taxonomic sequence of species (Alaudidae, Prunella), (iv) changes in species limits (Struthio camelus, Thalassarche cauta, Poecile lugubris, Phylloscopus tenellipes, Sylvia cantillans, Oenanthe lugens, Passer italiae), and (v) changes in nomenclature (Sylvia cantillans moltonii).

  • 17.
    Sangster, George
    et al.
    Stockholm University, Faculty of Science, Department of Zoology. Swedish Museum of Natural History, Sweden.
    Collinson, J. Martin
    Crochet, Pierre-Andre
    Kirwan, Guy M.
    Knox, Alan G.
    Parkin, David T.
    Votier, Stephen C.
    Taxonomic recommendations for Western Palearctic birds: 11th report2016In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 158, no 1, p. 206-212Article in journal (Refereed)
  • 18.
    Sangster, George
    et al.
    Stockholm University, Faculty of Science, Department of Zoology, Systematic Zoology.
    Collinson, J. Martin
    Crochet, Pierre-Andre
    Knox, Alan G.
    Parkin, David T.
    Votier, Stephen C.
    Taxonomic recommendations for British birds: eighth report2012In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 154, no 4, p. 874-883Article in journal (Other academic)
  • 19.
    Sangster, George
    et al.
    Stockholm University, Faculty of Science, Department of Zoology, Systematic Zoology. Swedish Museum of Natural History.
    Collinson, J. Martin
    Crochet, Pierre-Andre
    Knox, Alan G.
    Parkin, David T.
    Votier, Stephen C.
    Taxonomic recommendations for Western Palearcticbirds: ninth report2013In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 155, no 4, p. 898-907Article in journal (Other academic)
  • 20.
    Sangster, George
    et al.
    Stevenshof 17, 2312 GM Leiden, The Netherlands.
    Collinson, J Martin
    Helbig, Andreas J
    Knox, Alan G
    Parkin, David T
    Taxonomic recommendations for British birds: third report2005In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 147, no 4, p. 821-826Article in journal (Other academic)
  • 21.
    Sangster, George
    et al.
    Stockholm University, Faculty of Science, Department of Zoology, Systematic Zoology.
    Collinson, J. Martin
    Knox, Alan G.
    Parkin, David T.
    Svensson, Lars
    Taxonomic recommendations for British birds, Sixth Report2010In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 152, p. 180-186Article in journal (Other academic)
  • 22.
    Sangster, George
    et al.
    Stockholm University, Faculty of Science, Department of Zoology, Systematic Zoology.
    Collinson, Martin
    Crochet, Pierre-Andre
    Knox, Alan G.
    Parkin, David T.
    Svensson, Lars
    Votier, Stephen C.
    Taxonomic recommendations for British birds: seventh report2011In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 153, no 4, p. 883-892Article in journal (Other academic)
  • 23. Sangster, George
    et al.
    Collinson, Martin
    Knox, Alan G,
    Parkin, David T.
    Svensson, Lars
    Taxonomic recommendations for British birds, Fourth Report2007In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 149, p. 853-857Article in journal (Other academic)
  • 24.
    Sangster, George
    et al.
    Stockholm University, Faculty of Science, Department of Zoology. Swedish Museum of Natural History, Sweden.
    Roselaar, Cees S.
    Irestedt, Martin
    Ericson, Per G. P.
    Sillem's Mountain Finch Leucosticte sillemi is a valid species of rosefinch (Carpodacus, Fringillidae)2016In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 158, no 1, p. 184-189Article in journal (Refereed)
    Abstract [en]

    Sillem's Mountain Finch Leucosticte sillemi was described in 1992 on the basis of an adult and an immature specimen collected in western Tibet in September 1929, but its taxonomic validity and phylogenetic position have been unclear. Based on phylogenetic analysis of mitochondrial DNA from the holotype, we show that L.sillemi is not a colour morph of Brandt's Mountain Finch Leucosticte brandti but represents a valid, previously overlooked species of rosefinch (Carpodacus) that has secondarily acquired a pale plumage convergent on that of Leucosticte. Sillem's Mountain Finch is one of the least known species of bird and represents the only known species of rosefinch in which males have no reddish plumage coloration. This species and its sister taxon, the Tibetan Rosefinch Carpodacus roborowskii, are likely to be the world's highest-altitude sister-species pair of birds.

  • 25. Schlesselmann, Ann-Kathrin V.
    et al.
    Cooper, Jamie
    Dussex, Nicolas
    Stockholm University, Faculty of Science, Department of Zoology. Centre for Palaeogenetics, Sweden; Swedish Museum of Natural History, Sweden.
    Robertson, Bruce C.
    New Zealand endemic open-habitat specialist, the Black-fronted Tern (Chlidonias albostriatus), experienced population expansion during Pleistocene glaciation and recent decline2023In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 165, no 1, p. 288-296Article in journal (Refereed)
    Abstract [en]

    Understanding how climatic and environmental changes, as well as human activities, induce changes in the distribution and population size of avian species refines our ability to predict future impacts on threatened species. Using multilocus genetic data, we show that the population of a threatened New Zealand endemic open-habitat specialist, the Black-fronted Tern Chlidonias albostriatus – in contrast to forest specialists – expanded during the last glacial period. The population has decreased subsequently despite the availability of extensive open habitat after human arrival to New Zealand. We conclude that population changes for open habitat specialists such as Black-fronted Terns in pre-human New Zealand were habitat-dependent, similar to Northern Hemisphere cold-adapted species, whereas post-human settlement populations were constrained by predators independent of habitat availability, similar to other island endemic species. 

  • 26.
    Thorstrom, Russell
    et al.
    The Peregrine Fund.
    Lind, Johan
    Stockholm University, Faculty of Science, Department of Zoology, Ethology.
    First nest description, breeding, ranging and foraging behaviour of the Short-legged ground roller, Brachypteracias leptosomus, in Madagascar1999In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 141, no 4, p. 569-576Article in journal (Refereed)
    Abstract [en]

    The secretive, endemic Short-legged Ground-Roller Brachypteracias leptosomus was studied from October 1996 to February 1997 on the Masoala Peninsula, northeast Madagascar. Several vocalizations were associated with contact, courtship feeding and food solicitation. One study pair ranged within an area of 19.1 ha and spent 90% of their time together. They used small trees for foraging and resting, and durations of perch time averaged 9.8 min. Of the 229 identified prey items recorded, 88% were invertebrates and 12% vertebrates. The first described nests for this species were observed in December 1996 and January 1997. The first nest was in a natural tree cavity 18.1 m above the ground in a 133-cm diameter-at-breast height (dbh) Weinmannia sp., and it contained at least one egg. This nest failed on 1 January 1997 when a swarm of Honey Bees Apis mellifera took over the cavity. On 7 January, the pair began excavating another nest 22 m above the ground in a 174-cm dbh Canarium madagascarense, in the root mass and decayed material of epiphytes and below a 1 -m diameter forked branch. Incubation lasted between 22–26 days and the nestling period was 30 days. One young fledged in March 1997.

1 - 26 of 26
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