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Foraging decisions of Sandwich Terns in the presence of kleptoparasitising gulls
Stienen, E.W.M.; Brenninkmeijer, A. (2002). Foraging decisions of Sandwich Terns in the presence of kleptoparasitising gulls, in: (2002). VLIZ Coll. Rep. 32(2002). VLIZ Collected Reprints: Marine and Coastal Research in Flanders, 32: pp. chapter 40 [Subsequent publication]
In: (2002). VLIZ Coll. Rep. 32(2002). VLIZ Collected Reprints: Marine and Coastal Research in Flanders, 32. Flanders Marine Institute (VLIZ): Oostende, more
In: VLIZ Collected Reprints: Marine and Coastal Research in Flanders. Vlaams Instituut voor de Zee: Oostende. ISSN 1376-3822, more

Also published as
  • Stienen, E.W.M.; Brenninkmeijer, A. (2002). Foraging decisions of Sandwich Terns in the presence of kleptoparasitising gulls. The Auk 119(2): 473-486. dx.doi.org/10.1642/0004-8038(2002)119[0473:FDOSTI]2.0.CO;2, more
  • Stienen, E.W.M.; Brenninkmeijer, A. (2005). Foraging decisions of Sandwich Terns in the presence of kleptoparasitising gulls, in: Stienen, E.W.M. (2005). Living with gulls: trading off food and predation in the Sandwich Tern Sterna sandvicensis. Alterra Scientific Contributions, 15: pp. 61-79 [Subsequent publication], more

Keywords
    Competition; Foraging behaviour; Gulls; Marine birds; Prey selection; Larus ridibundus Linnaeus, 1766 [WoRMS]; Sterna sandvicensis Latham, 1787 [WoRMS]; Marine; Brackish water

Authors  Top | Datasets 
  • Stienen, E.W.M., more
  • Brenninkmeijer, A., more

Abstract
    We studied prey selection of Sandwich Terns (Sterna sandvicensis) in the presence of kleptoparasitising Black-headed Gulls (Larus ridibundus) on Griend, Dutch Wadden Sea, from 1992 to 1998. Most often, gulls robbed larger sandeels rather than herring from terns. Provided that one parent attends the chick, energy intake would be too low for the chicks' survival if exclusively fed on sandeel. By provisioning an increasing proportion of herring, parent terns could theoretically overcome a potential food shortage when the chicks grow older. However, the proportion of herring did not increase with age of chicks in most years. Instead, parents increased their foraging effort with the growth of their offspring. In years with high proportions of food loss, parents left their chicks unattended at the nest more often. In that way, parents were largely able to counterbalance food shortage of offspring. In 1992 and 1996, when diet composition was unfavorable and food losses to gulls were high, parents left their chicks unattended at the nest for 680% of the daylight period. It is argued that the present working level of parents might be higher than in the 1960s.

Datasets (2)
  • Feeding ecology Terns, more
  • Feeding ecology Terns: chicks, more

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