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Ocean control of the breeding regime of the sooty tern in the southwest Indian Ocean

By S. Jaquemet, M. Le Corre and G.D. Quartly

Abstract

Food availability, which is often seasonal, is regarded as a key factor in the breeding success of seabirds. In oceanic tropical areas, the resources are mostly patchy and ephemeral at the surface, and the seasonality is less marked than at higher latitudes. Such a situation influences greatly the breeding strategies of the oceanic seabird species. We conducted a comparative study of the breeding phenology of the sooty tern (Sterna fuscata) in relation to the local and regional oceanographic conditions around the four major colonies (Europa, Juan de Nova, Lys and Bird Islands) of the southwest Indian Ocean. Over the 1997-2003 period, around all the studied locations, the sea-surface temperature (SST) and the chlorophyll concentration in the Mozambique Channel and the Seychelles area showed clear seasonal differences related to the southern climate and the monsoon phenomena. The breeding activity is synchronized at each studied colony, but the timings are very different. Seasonal reproduction occurs in austral winter at Europa and Bird Island and in austral summer at Juan de Nova; at Lys Island the reproduction is non-seasonal. For the seasonal colonies, there is a large monthly change in SST just before the beginning of reproduction, which is a proxy indicating the annual phytoplankton bloom. This variation is accompanied by the development of oceanic features such as fronts that favour aggregation of prey, and may also play an important role in the presence of schools of surface tuna, which are very important for the foraging success of sooty terns. Conversely, around Lys Island the seasonal variations of the marine environment do not lead to pronounced development of oceanic structures, and consequently, the longer-lasting phytoplankton bloom could explain the non-seasonal breeding regime there. Further studies will help discern the advantages and disadvantages of seasonal and non-seasonal reproduction regime in response to unpredictable fluctuations of the marine environment

Topics: QL, GC
Year: 2007
OAI identifier: oai:eprints.soton.ac.uk:41836
Provided by: e-Prints Soton

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Citations

  1. (2002). 5 others,
  2. (1998). 6 others,
  3. (2005). A seasonally breeding tropical bird lacks absolute photorefractoriness in the wild, despite high photoperiodic sensitivity.
  4. (2005). Assessment of seabird community of the Mozambique Channel and its potential use as indicator of tuna abundance.
  5. (1997). Atlas of tropical tuna fisheries. World catches and environment. Paris, Orstom editions
  6. (1995). Body condition and seabird reproductive performance: A study of three petrel species.
  7. (2002). Breeding biology, lifes histories, and life history-environment interactions in seabirds. Biology of marine birds,
  8. (1981). Breeding schedules and feeding strategies of Seychelles seabirds.
  9. (2002). Climate and weather effects on seabirds. Biology of marine birds,
  10. (1990). Effect of El-Nino Southern Oscillation conditions on nestling growth rate in the dark-rumped petrel.
  11. (1998). Effects of colony location and nekton abundance on the at-sea distribution of four seabird species.
  12. (1997). Effects of spring environment on nesting phenology and clutch size of Black Brant.
  13. (2001). Evidence of intra-specific competition for food in a pelagic seabird.
  14. (1987). Food as limit on breeding birds: a life-history perpective.
  15. (2005). Foraging habitat of the seabird community of Europa Island (Mozambique Channel).
  16. (1987). Mass killing by rats of roosting common noddies.
  17. (1995). Multiscale variability of tropical ocean zooplankton biomass.
  18. (2003). Ocean warming and seabird communities of the California Current System: response at multiple temporal scales.
  19. (2000). Reproductive endocrinology of tropical seabirds : sex-specific pattern in LH, steroids, and prolactin secretion in relation to parental care.
  20. (2001). Response of seabirds to thermal boundaries in the tropical Pacific: the thermocline versus the Equatorial Front.
  21. (1950). Rookery de sternes aux Glorieuses. La Naturaliste Malgache II-1 Ashmole,
  22. (2004). Scale-dependent climate signals drive breeding phenology of three seabirds species.
  23. (2004). Sea-surface temperature constraints wedge-tailed shearwater foraging success within breeding seasons.
  24. (1971). Seabird ecology and the marine environment.
  25. (1990). Seabirds of the Farallon Islands.
  26. (2003). Search strategies of a pursuitdiving marine bird and the persistence of prey patches.
  27. (2003). Seasonal and interannual variation in the feeding ecology of a tropical oceanic seabird, the red-tailed tropicbird Phaethon rubricauda.
  28. (1996). Seasonal variations of sea-surface salinity and temperature in the tropical Indian Ocean.
  29. (2002). Sooty Tern (Sterna fuscata).
  30. (1976). Subannual breeding and moult cycles in the Bridled tern (Sterna anaethetus) in the Seychelles.
  31. (2002). Synchronization of animal population dynamics by large-scale climate.
  32. (1996). Temporal variation in growth performance in six species of tropical, pelagic seabirds.
  33. (1986). The biology of terns nesting at Aldabra Atoll, Indian Ocean, with particular reference to breeding seasonality.
  34. (1976). The biology of the Sooty tern Sterna fuscata in the Seychelles and the effects of experimental removal of its eggs.
  35. (1988). The boundary currents east and north of Madagascar 1.Geostrophic currents and transports.
  36. (2003). The breeding avifauna of Cosmoledo Atoll (Seychelles) with special reference to seabirds: conservation status 12 and international importance.
  37. (1984). The circulation of the Mozambique Channel.
  38. (1973). The importance of certain assemblages of birds as ‘information centres’ for food-finding.
  39. (1991). The Mozambique Channel revisited.
  40. (1991). Time and energy limits to the foraging radius of Sooty Terns Sterna fuscata.
  41. (1974). Une année d'observations de surface dans la zone de mousson de la partie occidentale de l'océan Indien.
  42. (2002). Volume transport and property distributions of the Mozambique Channel.

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