Sea-bird aggregation at a deep North Pacific seamount

Haney, J. Christopher; Haury, Loren R.; Mullineaux, Lauren S.; Fey, Connie L.

doi:10.1007/bf00350317

Cited by 42 publications

(22 citation statements)

References 36 publications

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“…Although in our study the tracked birds associated with positive SLAs, these were not indicative of mesoscale eddies as birds also preferred areas with low geostrophic currents. Similarly, birds used oceanic regions with moderate depth slopes, and might be expected to aggregate around seamounts (Haney et al 1995), yet we found no supporting evidence (see 'Materials and methods'). Indeed, as Murphy's petrels do not appear to target obvious oceanographic or topographic structures, they might select calm waters for easier visual detection of buoyant prey, such as moribund squid, which float close to the surface (Ballance & Pitman 1999).…”

Section: Year-round Distribution and Habitat Preferencesmentioning

confidence: 56%

“…Additionally, (9) the distance to the colony was extracted for locations during the breeding season, to represent the central-place foraging constraint, and (10) tracking year was also included. Murphy's petrels have previously been sighted in the vicinity of a seamount in the North Pacific (Haney et al 1995), and as a result we initially considered distance to the nearest seamount (a topographically distinct feature with an elevation >1000 m above the seafloor; Yesson et al 2011) as a predictor in our models. However, initial analyses revealed that birds either showed no preferences or avoided areas around seamounts; as the latter is counterintuitive, we excluded the variable from further analyses.…”

Section: Habitat Analysismentioning

confidence: 99%

“…Model summaries are shown in the Supplement at www.int-res.com/ articles/ suppl/ m579p139_supp.pdf non-breeding. There are few sightings of Murphy's petrels from ship-based surveys; they include small numbers observed off the coast of California and in the eastern tropical Pacific (Bartle et al 1993, Haney et al 1995, Spear et al 2007). Given the chronological sequence of observations off California (April to June), in the Gulf of Alaska (July) and in the Hawaiian archipelago (September to November), Bartle et al (1993) suggested that this species performs anticlockwise movements through the North Pacific during breeding.…”

Section: Year-round Distribution and Habitat Preferencesmentioning

confidence: 99%

See 2 more Smart Citations

Escaping the oligotrophic gyre? The year-round movements, foraging behaviour and habitat preferences of Murphy’s petrels

Clay¹,

Phillips²,

Manica³

et al. 2017

Mar. Ecol. Prog. Ser.

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Section: Year-round Distribution and Habitat Preferencesmentioning

confidence: 56%

Section: Habitat Analysismentioning

confidence: 99%

Section: Year-round Distribution and Habitat Preferencesmentioning

confidence: 99%

See 1 more Smart Citation

Escaping the oligotrophic gyre? The year-round movements, foraging behaviour and habitat preferences of Murphy’s petrels

Clay¹,

Phillips²,

Manica³

et al. 2017

Mar. Ecol. Prog. Ser.

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“…4 & 5). The MAR north of the Azores is a likely area of enhanced productivity resulting from cold water upwelling and eddies, particularly in the vicinity of seamounts (Haney et al 1995, Haury et al 2000, Morato et al 2008a, which have their highest density between the Azores and the Charlie Gibbs Fracture Zone at 52°N (Epp & Smoot 1989, Gubbay 2003. The density of seamounts along the MAR declines markedly north of this zone, and this was the most northerly location of foraging birds during the study (Fig.…”

Section: Discussionmentioning

confidence: 99%

Dual-foraging of Cory’s shearwaters in the Azores: feeding locations, behaviour at sea and implications for food provisioning of chicks

Magalhães¹,

Santos²,

Hamer³

2008

Mar. Ecol. Prog. Ser.

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Many procellariiform (tube-nosed) seabirds employ a dual-foraging strategy involving repeated alternation of short and long foraging trips. For species breeding at sites around the Southern Ocean, long trips typically extend to areas of enhanced productivity at great distance from the nest. Evidence concerning the use of such areas during dual-foraging in other oceanographic regions is, however, limited. The present study examines the foraging strategy, locations and behaviour at sea of Cory's shearwaters in the Azores, a chain of 9 islands and associated islets in 3 groups straddling the mid-Atlantic ridge (MAR) in the North Atlantic Ocean. Adults used a dual-foraging strategy with an average of 3 short (1 to 4 d) trips followed by a long trip of up to 20 d (average 9 d). Short trips were evenly distributed around breeding sites within an average range of 75 km, whereas long trips without exception headed north of the Azores and extended up to 1800 km from the nest. Core foraging areas for long trips were within apparent regions of enhanced productivity resulting from cold water upwelling along the MAR north of the colony (for birds from the central Azores) or over the western flank of the MAR northwest of the colony (for birds from the western Azores). On long trips from all 3 island groups birds also visited an additional area of enhanced productivity in the region of Flemish Cap, close to the North American continental shelf edge. Birds commuted to and from distant foraging sites relatively quickly (25 km h -1 on average), but individual parents did not co-ordinate their foraging activity to reduce the frequency of nights when chicks were unfed. As a result, chicks experienced much longer intervals between feeds (up to 9 nights) than conspecifics at other North Atlantic islands in the absence of dual-foraging (maximum 4 nights). However, chicks in the Azores received much larger meals when they were fed, and so the overall food provisioning rate (g d

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“…Studies have shown that seabirds are predictably concentrated at physical oceanographic features of different spatial scales, from tidal fronts through mesoscale eddies to latitudinal frontal systems, which all display increased prey availability (Haney et al 1995, Pakhomov & McQuaid 1996, Rodhouse et al 1996, Hunt et al 1999. Once at an area of enhanced biological productivity, procellariforms may use odor trails or visual clues to locate concentrations of prey (Nevitt 1999).…”

Section: Introductionmentioning

confidence: 99%

Exploitation of mesoscale oceanographic features by grey-headed albatross Thalassarche chrysostoma in the southern Indian Ocean

Nel

Lütjeharms²,

Pakhomov³

et al. 2001

Mar. Ecol. Prog. Ser.

171

160

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Breeding grey-headed albatross Thalassarche chrysostoma, tracked from Marion Island (Prince Edward Islands) during November-December 1997 and January-February 1998, showed a strong association with mesoscale oceanographic features, as identified by sea surface height anomalies, in the southern Indian Ocean. During incubation, most birds foraged to the north of the island, at the edges of anomalies created by the Agulhas Return Current in the Subtropical Convergence and the Subantarctic zones. In contrast, during chick-rearing all tracked birds foraged to the southwest of the island, at the edges of anomalies along the South-West Indian Ridge. Previous work in this area has shown that these anomalies are in fact eddies that are created as the Antarctic Circumpolar Current crosses the South-West Indian Ridge. Diet samples taken during the chick-rearing period showed a predominance of fresh specimens of the predatory fish Magnisudis prionosa and the squid Martialia hyadesi. Myctophid fish and amphipods Themisto gaudichaudii, both known prey of M. hyadesi, were also well represented in our samples. Diet samples taken from tracked birds showed birds feeding at edges of positive anomalies returning with fresh specimens of M. prionosa and M. hyadesi. Predatory fish and squid are thus presumably concentrated at these features. Eddies formed at the South-West Indian Ridge have also been shown to drift closer to Marion Island, within the foraging range of penguins and seals breeding on Marion Island. We therefore suggest that these mesoscale oceanographic features may be an important component of the 'life-support' system enabling globally significant populations of seabirds and seals to breed at the Prince Edward Islands. KEY WORDS: Albatross · Foraging ecology · Diet · OceanographyResale or republication not permitted without written consent of the publisher

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Sea-bird aggregation at a deep North Pacific seamount

Cited by 42 publications

References 36 publications

Escaping the oligotrophic gyre? The year-round movements, foraging behaviour and habitat preferences of Murphy’s petrels

Escaping the oligotrophic gyre? The year-round movements, foraging behaviour and habitat preferences of Murphy’s petrels

Dual-foraging of Cory’s shearwaters in the Azores: feeding locations, behaviour at sea and implications for food provisioning of chicks

Exploitation of mesoscale oceanographic features by grey-headed albatross Thalassarche chrysostoma in the southern Indian Ocean

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