Marine Biology

, Volume 123, Issue 1, pp 1–9 | Cite as

Sea-bird aggregation at a deep North Pacific seamount

  • J. C. Haney
  • L. R. Haury
  • L. S. Mullineaux
  • C. L. Fey


During June 1991, we studied sea birds at a mid-ocean seamount (Fieberling Guyot) in the eastern North Pacific Ocean. Avifaunal composition changed from small Procellariiformes [a storm-petrel; Oceanodroma leucorhoa (Vieillot)] away from the seamount to an assemblage dominated by larger tubenoses [mostly black-footed albatross Diomedea nigripes Audubon and Cook's petrel Pterodroma cookii (Gray)]. Compared to adjacent waters, sea-bird density and biomass within a 30-km radius centered on the seamount summit were 2.4 and 8 times higher, respectively. Individual sea-bird taxa were 2 to 40 times more abundant at the seamount relative to values reported previously from large-scale surveys of deep-ocean regions in the central North Pacific. In September 1991 we studied potential prey of sea birds in the upper water column using a neuston net and multiple opening-closing net system (MOCNESS) tows. Most potential prey types in the neuston exhibited no significant enhancement over the seamount. MOCNESS samples at 10 m depth, however, showed several prey types to be more abundant over the seamount, and the dominant size class of fish was slightly larger. We attribute the sea-bird aggregation observed at this seamount to changes in the abundance and/or behavior of pelagic organisms in the deep scattering layer (not adequately sampled in this study), perhaps augmented by migrations of seamount residents into the surface layers. Processes on and in the vicinity of seamounts may provide spatially-predictable prey to wide-ranging aerial sea birds foraging in this relatively austere environment.


Prey Type North Pacific Ocean Potential Prey Pelagic Organism Scattering Layer 
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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • J. C. Haney
    • 1
  • L. R. Haury
    • 2
  • L. S. Mullineaux
    • 3
  • C. L. Fey
    • 2
  1. 1.Wildlife Technology Program, School of Forest ResourcesThe Pennsylvania State UniversityDuBoisUSA
  2. 2.Marine Life Research GroupScripps Institution of OceanographyLa JollaUSA
  3. 3.Biology DepartmentWoods Hole Oceanographic InstitutionWoods HoleUSA

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