Dual-foraging and co-ordinated provisioning in a tropical Procellariiform, the wedge-tailed shearwater

  • Congdon B
  • Krockenberger A
  • Smithers B
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Abstract

To sustain breeding while simultaneously compensating for poor local resource availability, many temperate Procellariiformes (tube-nosed seabirds) access highly productive areas 'at-distance' from breeding colonies using a unique dual-foraging strategy. We tested for, and observed, a similar dual foraging strategy in a tropical Procellariiform, the wedge-tailed shearwater Puffinus pacificus. Foraging adults repeatedly performed short-trip cycles of multiple 1 to 4 d trips followed by a single long-trip of similar to 8 d. As with temperate species, wedge-tailed shearwaters used long-trips to build body reserves that they passed onto chicks by not self-provisioning adequately during the early stages of each short-trip cycle. Unlike temperate species (1) long-trip length and adult mass change during long-trips was inversely related to adult mass at the beginning of the same long-trip, and (2) foraging mode changeover appeared to be co-ordinated and was not initiated by adults reaching some critical lower mass. This implies that the dual-foraging pattern observed in wedge-tailed shearwaters is a consequence of the median time adults require to replenish body reserves on long-trips. We conclude that foraging strategies in wedge-tailed shearwaters vary spatially relative to near-colony resource availability, and that dual-foraging is a general Procellariiform life-history strategy used to address similar ecological constraints in both temperate and tropical systems. Our findings suggest that wedge-tailed shearwaters of the southern Great Barrier Reef (GBR) may be dependent on localised areas of high productivity 'at-distance' from breeding colonies to sustain breeding

Author-supplied keywords

  • Co-ordinated provisioning
  • Dual-foraging
  • Feeding ecology
  • Great Barrier Reef
  • Procellariiform
  • Puffinus pacificus
  • Wedge-tailed shearwater

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Authors

  • Bradley C. Congdon

  • Andrew K. Krockenberger

  • Brian V. Smithers

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