Prey spectrum of breeding sooty shearwaters (<i>Puffinus griseus</i>) in New Zealand

Cruz, Justine B.; Lalas, Chris; Jillett, J. B.; Kitson, Jane; Lyver, Philip O'b.; Imber, Michael J.; Newman, Jamie; Møller, Henrik

doi:10.1080/00288330.2001.9517044

Cited by 18 publications

(12 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Sooty Shearwater is a generalist (Ballance et al 1997), top-level predator, feeding opportunistically at the fourth and fifth trophic levels (Brown et al 1981, Cruz et al 2001, Seki and Polovina 2001 and able to switch forage species based on prey abundance (Kitson et al 2000). It moves rapidly over large distances to exploit energy-rich food patches (Shaffer et al 2006(Shaffer et al , 2009.…”

Section: Hunt Tally Chick Size and Climatic Variabilitymentioning

confidence: 99%

Long-term population trends of Sooty Shearwater (Puffinus griseus) revealed by hunt success

Clucas¹

2011

Ecological Applications

View full text Add to dashboard Cite

The annual hunt of Muttonbirds (chicks of the Sooty Shearwater, Puffinus griseus), undertaken by the Rakiura Māori people of southern New Zealand, is economically and socially integral to their cultural identity. Muttonbirders concerned at ensuring that the hunt remains viable for coming generations have provided catch records to help ascertain historic trends in hunt success. Analysis of eight catch diaries for a 67-year period demonstrates considerable consistency across diaries in the variability of hunt success, as measured by annualized mean daily hunt tallies. A conservative estimate of the overall annual decline in hunt success is -1.89% (95% CI: -1.14% to -2.65%). Birders' observations of a changing relationship between chick quality and hunt success was evidenced across diaries. Reduced hunt success from the 1990s indicates that possible adult "knockdowns" and/or sustained substantial reductions in breeding proportions have occurred. Chick size has remained constant, suggesting little change in the provisioning environment. Catch per unit effort data, provided by a single diary, confirms a link between variability in annual hunt success and chick abundance. The Pacific Decadal Oscillation (PDO) and the Southern Annular Mode (SAM) are correlated with hunt success and chick size, respectively. Interannual PDO+ (or PDO-) values are correlated with higher (or lower) tallies, whereas SAM+ (or SAM) values are associated with larger (or smaller) chick size. Uncertainty in the relationship between the breeding Sooty Shearwater population, chick catch, and environmental perturbation in their feeding grounds could be reduced with the inclusion of hunt time in all diary records. Ongoing prolonged decline in a top-trophic-level predator such as the Sooty Shearwater raises serious concern that long-term oceanic changes have been occurring and that long-term sustainability of muttonbirding is in doubt.

show abstract

Section: Hunt Tally Chick Size and Climatic Variabilitymentioning

confidence: 99%

Long-term population trends of Sooty Shearwater (Puffinus griseus) revealed by hunt success

Clucas¹

2011

Ecological Applications

View full text Add to dashboard Cite

show abstract

“…Grey-faced Petrels exploit a diverse range of squid species and lesser amounts of fish and crustaceans (Imber 1973). The findings in this study indicate that most ofthese prey items are gathered near the ocean surface (in the top 5 m of the water column) but some prey could be taken at depths down to 23 m. Shearwaters feed mainly on small fish or crustaceans (especially krill and amphipods) caught during diurnal feeding sessions (Marchant & Higgins 1990, Warham 1990, Cruz et al 2001. Flesh-footed Shearwaters feed mainly on small fish (G. Taylor unpub!.…”

Section: Interspecific Comparisonsmentioning

confidence: 85%

“…This species is an even more proficient diver than the two previous species and regularly dives between 10-35 m, even during short foraging trips (1-2 days) away from the colony. Sooty Shearwaters feed mainly on small crustaceans (krill and amphipods) but also take squid and fish (Cruz et al 2001). Sooty Shearwaters are the most capable diving species of the four larger petrels examined in this study and short trips away from the colony (1-5 days) regularly resulted in maximum dive depths of 40-60 m and some birds may dive as deep at 93 m. Marini, 1935, around South America formed compact fish shoals at depths greater than 35m during the day (sometimes down to 75-100 m), while at night these fish dispersed thinly 3-20 m below the sea surface.…”

Section: Interspecific Comparisonsmentioning

confidence: 99%

Maximum dive depths of eight New Zealand Procellariiformes, including Pterodroma species

Taylor¹

2008

PPRST

View full text Add to dashboard Cite

Lightweight capillary tube depth gauges were attached to eight petrel species breeding at New Zealand colonies during the period 1998-2008. This paper presents the first information on the diving ability of Pterodroma petrels. Grey-faced Petrels, Pterodroma macroptera gouldi, re corded maximum dives down to 23 m. Males (6.3 ± 6.3 m SD) dived deeper on average than females (3.6 ± 2.5 m) during the incubation period but not significantly so (P�0.06). Breeding birds dived significantly deeper on average than non-breeders, and breeding males dived significantly deeper on average than non-breeding males. The two small Pterodroma species sampled, Pterodroma pycrofti and Pterodroma nigripennis, only exhibited shallow dives down to 2 m but sample sizes were small. Sooty Shearwaters, Pujfinus griseus, had mean maximum dive depths of 42.7 ± 23.7 m, with males (53.0 ± 17.3 m) diving significantly deeper on average than females (20.1 ± 20.4 m) during the incubation period. One male Sooty Shearwarer dived to nearly 93 m, the deepest dive so far recorded in the order Procellariiformes.Flesh-footed Shearwaters, Pujfinus carneipes, dived to 28 m, with a mean maximum dive depth of 13.6 ± 7.9 m. Hutton' s Shearwaters, Pujfinus huttoni, had a mean maximum dive depth of 23.0 ± 8.5 m (range 11.1-36.6 m). A single Fluttering Shearwater, Pujfinus gavia, recovered with a dive gauge had dived to 29 m. Mean maximum dives made by Common Diving-Petrels, Pelecanoides urinatrix, of 10.9 ± 6.1 m (range 6.9-22.2 m) were shallower than results reported from other sites but may have been biased by gauge failures. Capillary gauges provide the best means we have at present to understand the diving capability of small seabirds. While studies elsewhere have shown these gauges may overestimate diving performance by about 10-15%, other factors identified in this study indicate rhat sometimes diving performance will be underestimated using this simple technique.

show abstract

“…This species is abundant in the coastal waters surrounding the Chilean Fjords and offshore along in the Cape Horn current during the breeding season and is found throughout the Chilean-Peruvian (Humboldt) current during the post-nuptial migratory period (March-July) (Spear and Ainley 1999). Nevertheless, the numerical and conservation status of these populations is not yet known, in contrast to what is known about populations in New Zealand (Richdale 1963;Hamilton et al 1997;Jones 2000;Cruz et al 2001;Uhlman 2003).…”

mentioning

confidence: 86%

“…The prey consumed by Sooty in South American waters is still unknown although Cruz et al (2001) described a wide range of prey for New Zealand sooty populations. The stomach content of two individuals from the Guafo showed fish remains and a small amount of squid.…”

Section: State Of the Knowledge For Sooty Shearwater In South Americamentioning

confidence: 99%

Sooty Shearwater (Puffinus griseus) on Guafo Island: the largest seabird colony in the world?

Reyes-Arriagada¹,

Campos-Ellwanger²,

Schlatter³

et al. 2006

Biodivers Conserv

View full text Add to dashboard Cite

Sooty Shearwater (Puffinus griseus) is the most common Procellariiform seabird along the south-eastern South American coast. In recent years the wintering population off California has declined noticeably. This decline has been confirmed on the breeding grounds in New Zealand. In Chile, knowledge of the population is limited. Investigations on Isla Guafo were carried out during two seasons (03/04 and 04/05), beginning an ongoing monitoring and evaluation of the breeding population of this species in southern South America. On Isla Guafo we estimate a population of about 4 million birds that nest above 150 m above sea level (m.a.s.l.) under a forest without understory. Sooty Shearwaters on Isla Guafo prefer north and western slopes that we hypothesise protect them from the predominantly southerly winds. Population of the species from New Zealand and Australia are compared with the Isla Guafo population and the state of its conservation is discussed.

show abstract

Prey spectrum of breeding sooty shearwaters (Puffinus griseus) in New Zealand

Cited by 18 publications

References 27 publications

Long-term population trends of Sooty Shearwater (Puffinus griseus) revealed by hunt success

Long-term population trends of Sooty Shearwater (Puffinus griseus) revealed by hunt success

Maximum dive depths of eight New Zealand Procellariiformes, including Pterodroma species

Sooty Shearwater (Puffinus griseus) on Guafo Island: the largest seabird colony in the world?

Contact Info

Product

Resources

About