Oceanographic characteristics of areas used by Cory’s shearwaters during short and long foraging trips in the North Atlantic

Paiva, Vítor H.; Geraldes, Pedro; Ramírez, Iván; Meirinho, Ana; Garthe, Stefan; Ramos, Jaime A.

doi:10.1007/s00227-010-1417-5

Cited by 66 publications

(57 citation statements)

References 51 publications

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“…In line with this, birds dived more frequently in short trips compared with long trips. The high number of dives recorded in this study during short trips is in accordance with Paiva et al (2010b) who recorded an increase of birds diving effort in Cory's shearwater (Calonectris borealis) when foraging over low productivity waters.…”

Section: Effect Of Phase and Trip Type On Foraging Effortsupporting

confidence: 92%

“…This dual-foraging strategy occurs especially in colonies surrounded by low productive waters (Granadeiro et al 1998;Paiva et al 2010a). Thus, under these conditions, short trips for chick-feeding occur in sub-optimal foraging areas close to the colony (Paiva et al 2010b;Cecere et al 2014) at the expense of the parental body condition (Weimerskirch et al 1994). Conversely, long trips allow birds to visit more profitable areas far away from the colony to feed for themselves and replenish their energy reserves (Baduini and Hyrenbach 2003;Magalhães et al 2008).…”

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confidence: 99%

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A new algorithm for the identification of dives reveals the foraging ecology of a shallow-diving seabird using accelerometer data

et al. 2017

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Island (35°51′33″N; 12°51′34″E) from 12 June to 8 September 2015 by deploying accelerometer data loggers on 60 Scopoli's shearwaters. Four birds were also equipped with TDRs. TDRs recorded only 17.7% of the dives detected by the accelerometers using the algorithm. A total of 82.3% of dives identified by algorithm were too short or shallow to be detected by TDRs. Therefore, TDRs were not accurate enough to detect most of the dives in Scopoli's shearwaters, which foraged mostly close to the sea surface. Our data showed that birds performed shorter foraging trips and dived more frequently in the early chick-rearing period compared with the late chick-rearing and incubation phases. Furthermore, parents dived more frequently during short foraging trips. Our results suggest that Scopoli's shearwaters maximised their foraging effort (e.g. number of dives, short trips) during shorter foraging trips and during early chick-rearing.

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Section: Effect Of Phase and Trip Type On Foraging Effortsupporting

confidence: 92%

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confidence: 99%

A new algorithm for the identification of dives reveals the foraging ecology of a shallow-diving seabird using accelerometer data

et al. 2017

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“…At SG, shearwaters performed much longer trips, reaching in most cases the Western African shelf, also an important upwelling zone (Davenport et al 2002). This last result indicates that the food availability around SG may be scarce, which agrees with previous studies that reported lower feeding frequencies (Granadeiro et al 1998b) and longer foraging trips at this colony (Catry et al 2009;Paiva et al 2010b), when compared to BE. Indeed, the length of foraging trips is known to be largely influenced by the local food availability (Uttley et al 1994) and by the distance to the most profitable areas (Paiva et al 2010c).…”

Section: Foraging Strategy and Chick Conditionsupporting

confidence: 90%

Parent–offspring dietary segregation of Cory’s shearwaters breeding in contrasting environments

et al. 2012

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In pelagic seabirds, who often explore distant food resources, information is usually scarce on the level of trophic segregation between parents and their offspring. To investigate this issue, we used GPS tracking, stable isotopes and dietary information of Cory's shearwaters Calonectris diomedea breeding in contrasting environments. Foraging trips at Selvagem Grande (an oceanic island) mainly targeted the distant African coast, while at Berlenga island (located on the continental shelf), shearwaters foraged mainly over nearby shelf waters. The degree of isotopic segregation between adults and chicks, based on d 13 C, differed markedly between the two sites, indicating that adult birds at Selvagem fed their chicks with a mixture of shelf and offshore pelagic prey but assimilated more prey captured on coastal shelf waters. Isotopic differences between age classes at Berlenga were much smaller and may have resulted from limited dietary segregation or from age-related metabolic differences. The diet of shearwaters was also very different between the two colonies, with offshore pelagic prey only being detected at Selvagem Grande. Our findings suggest that spatial foraging constraints influence resource partitioning between pelagic seabirds and their offspring and can lead to a parent-offspring dietary segregation.

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“…Depth gradients are steeper at seamounts, 412 and where shelf-edge fronts form, which are zones of intense mixing and enhanced primary 413 production (Bost et al 2009, Louzao et al 2011b, Wakefield et al 2011, Scales et al 2014. 414 Also, several studies have shown associations of seabirds with frontal systems influenced by 415 bathymetric features (Phillips et al 2005, 2006, Paiva et al 2010a, Paiva et al 2010b, 416 Louzao et al 2011b, Rayner et al 2012. 417…”

Section: Distribution and Habitat Use 390mentioning

confidence: 99%

Consistency in migration strategies and habitat preferences of brown skuas over two winters, a decade apart

Carneiro¹,

Manica²,

Clay³

et al. 2016

Mar. Ecol. Prog. Ser.

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antarcticus lonnbergi from South Georgia were analysed in two winters, a decade apart, to 25 examine the degree of consistency in migration strategies and habitat preferences during the 26 non-breeding and pre-laying exodus periods. Oceanographic habitat preferences of tracked 27 skuas were determined using a robust model accounting for availability. At the population 28 level, brown skuas were broadly consistent in their choice of wintering areas and habitat 29 preferences, although the distribution extended further east in 2012 than in 2002. Skuas 30 preferred areas associated with static oceanography (bathymetric features) both during the 31 non-breeding and pre-laying periods, which may explain the consistency between years in 32 habitat use. There was no significant effect of year on departure dates from South Georgia, 33 but birds returned earlier to the colony in 2002. Migration schedules varied according to 34 breeding status, with failed birds departing earlier than birds that bred successfully. Although 35 failed birds travelled further from the colony, there was little variation in dates of return. In 36 general the timing of movements was similar between sexes, but females were more likely 37 than males to engage in a pre-laying exodus. Brown skuas spent a much higher proportion 38 of time sitting on the water than other seabirds during both the non-breeding and pre-laying Seabirds spend most of their lives at sea, only returning to land to breed. Understanding the 55 factors that influence their marine distribution and habitat preferences is therefore essential 56 for mitigating threats at sea, including the establishment of an effective, evolving network of 57 protected areas that will safeguard against future biodiversity loss (Block et al. 2011, 58 Frederiksen et al. 2012. The open ocean is a dynamic environment, and seabirds frequently 59 target areas of higher prey availability , Nur et al. 2011, 60 Quillfeldt et al. 2013. These regions are often characterised by local physical features or 61 processes, including eddies, frontal systems, upwelling zones and shelf breaks, that 62 increase primary production or serve to aggregate animals at higher trophic levels 63 (Wakefield et al. 2009, Kappes et al. 2010, Pinet et al. 2011, Louzao et al. 2011a. 64Reductions in size, and improvements in battery-life and functionality of tracking devices 65 since the 1990s have greatly improved our knowledge of at-sea distribution patterns and 66 behaviour of marine predators (Phillips et al. 2008). More recently, studies that combine 67 tracking data with remotely sensed environmental data in habitat models have provided key 68 insights into the oceanographic factors that drive the distribution of seabirds (Péron et al. 69 2010, Louzao et al. 2011b, Wakefield et al. 2011, Quillfeldt et al. 2015. 70 A limitation of many biologging studies is that data are available from relatively few 71 individuals tracked over short periods of time (Žydelis et al. 2011). In addition, as most 72 physical characteristic...

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Oceanographic characteristics of areas used by Cory’s shearwaters during short and long foraging trips in the North Atlantic

Cited by 66 publications

References 51 publications

A new algorithm for the identification of dives reveals the foraging ecology of a shallow-diving seabird using accelerometer data

A new algorithm for the identification of dives reveals the foraging ecology of a shallow-diving seabird using accelerometer data

Parent–offspring dietary segregation of Cory’s shearwaters breeding in contrasting environments

Consistency in migration strategies and habitat preferences of brown skuas over two winters, a decade apart

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