Moulting strategies of a long‐distance migratory seabird, the Mediterranean Cory's Shearwater<i>Calonectris diomedea diomedea</i>

Ramos, Raül; Militão, Teresa; González‐Solís, Jacob; Ruíz, Xavier

doi:10.1111/j.1474-919x.2008.00877.x

Cited by 44 publications

(64 citation statements)

References 52 publications

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“…Nevertheless, (primary) moultbreeding overlap does occur in petrels that are longdistance migrants (e.g. Alonso et al 2009), as birds have the option of starting moult while still breeding, and then suspending it until after they reach the winter quarters (Ramos et al 2009). This allows them to migrate without the need to allocate energy and nutrients to feather synthesis, as well as avoid costs related to gaps in the wing plumage at a time when efficiency during long-distance flight is paramount.…”

Section: Discussionmentioning

confidence: 99%

Differences in the timing and extent of annual moult of black-browed albatrosses Thalassarche melanophris living in contrasting environments

et al. 2013

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Moult entails costs related to the acquisition of energy and nutrients necessary for feather synthesis, as well as the impact of reduced flight performance induced by gaps in the wing plumage. Variation in moult strategies within and between populations may convey valuable information on energetic trade-offs and other responses to differing environmental constraints. We studied the moult strategies of two populations of a pelagic seabird, the black-browed albatross Thalassarche melanophris, nesting in contrasting environments. According to conventional wisdom, it is exceptional for albatrosses (Diomedeidae) to moult while breeding. Here we show that black-browed albatrosses breeding on the Falklands regularly moult primaries, tail and body feathers during chick-rearing, and the majority of those at South Georgia show some body feather moult in late chick-rearing. The greater moult-breeding overlap at the Falklands allows the birds to annually renew more primary feathers than their counterparts at South Georgia. The results of the present paper, pooled with other evidence, suggest that black-browed albatrosses from South Georgia face a more challenging environment during reproduction. They also serve to warn against the uncritical acceptance of conventional ideas about moult patterns when using feathers to study the ecology of seabirds and other migrants for which there is scant information at particular stages of the annual cycle.

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Section: Discussionmentioning

confidence: 99%

Differences in the timing and extent of annual moult of black-browed albatrosses Thalassarche melanophris living in contrasting environments

et al. 2013

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“…Seabird catches of LLPB are very erratic, showing high catch concentrated in a few sets. Other authors provide records regarding the unusually high catch of Procellariformes in undefined longlines in North East peninsular waters: 32 Calonectris diomedea on October 5 th 2004 (Ramos et al 2009) and at least 60 Puffinus mauretanicus on (Carboneras, pers. comm.).…”

Section: Discussionmentioning

confidence: 99%

Seabird bycatch in Spanish Mediterranean large pelagic longline fisheries, 2000-2008

García-Barcelona

Urbina

Serna

et al. 2010

Aquat. Living Resour.

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-Incidental catch or bycatch represents a significant threat for the conservation of seabird populations. The western Mediterranean is an important fishing area where the Spanish pelagic and semi-pelagic longline fleet targeting swordfish (Xiphias gladius), bluefin tuna (Thunnus thynnus) and albacore (Thunnus alalunga) operates. Bycatch of these fisheries includes several seabird species. Given the importance of conservation of the bycatch species (marine mammals, turtles, sharks and seabirds), an on-board observer program was implemented by the Spanish Oceanographic Institute (IEO); this included collecting data on effort and catch, as well as weight and number of individuals of the main bycatch species. The aim of the present study is to report data on seabird bycatch collected by the on-board observer program of the IEO in the Western Mediterranean. Data on seabird bycatch were collected for the period 2000-2008, throughout the year. Six longline gears targeting large pelagic fish were identified operating in the area of study, but only three had an effect on seabird species. Differences in catch per unit effort (CPUE, birds per 1000 hooks) for each gear, as well as their effect on particular seabird species, are reported in this study. A total of 4 786 466 hooks were monitored, which yielded 182 seabirds belonging to 7 different species. The average CPUE for the studied period was 0.038 birds per 1000 hooks. Cory's shearwater (Calonectris diomedea) and yellow-legged gull (Larus michahellis) were the species the most highly represented in the catch. In contrast, Balearic shearwater (Puffinus mauretanicus) was only present in the longline fishery targeting albacore (CPUE = 0.005 birds per 1000 hooks). Our results suggest that Cory's shearwater is the species the most affected by the longline fishery in the Western Mediterranean, probably due to its biological characteristics, and corroborate the well-established downward trend in its population.Key words: Bycatch / Seabird / CPUE / Western Mediterranean Sea / Pelagic longline Résumé -Les captures fortuites ou accessoires représentent une menace considérable pour la sauvegarde des populations d'oiseaux de mer. La partie occidentale de la Méditerranée est une zone importante de pêche où la flotte espagnole de palangriers pélagiques et semi-pélagiques opère et cible l'espadon (Xiphias gladius), le thon rouge (Thunnus thynnus) et le germon (Thunnus alalunga). Les captures accessoires de ces pêches incluent plusieurs espèces d'oiseaux de mer. Étant donnée l'importance de la protection des espèces capturées accidentellement (mammifères marins, tortues, requins et oiseaux de mer), un programme a été mis en place par l'Institut espagnol d'Océanographie (IEO) : des observateurs étant à bord collectent des données d'effort de pêche et de capture, aussi bien que le nombre d'individus et le poids des principales espèces des prises accessoires. L'objectif de cette étude est de rapporter les données de captures accessoires des oiseaux de mer, collectées par ce prog...

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“…Since the incubation routine in petrels depends on relief by the partner, males and females of both subspecies need to forage relatively close to the breeding colony ( Warham 1990). During the chick-rearing period, both satellite-tracking data and stable isotope values from the P1 (moulted during chick-rearing period, Ramos et al 2009) revealed a spatial segregation in foraging areas between subspecies. We found that all satellitetracked individuals of C. d. diomedea foraged exclusively in proximity to the breeding colony in the Mediterranean waters, whereas satellite-tracked Similarly to P1, we found a significant difference between subspecies in the isotopic values in S8 (moulted during migration, Ramos et al 2009), also suggesting spatial segregation between the subspecies in winter.…”

Section: Discussionmentioning

confidence: 99%

Foraging segregation between two closely related shearwaters breeding in sympatry

et al. 2009

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Trophic segregation has been proposed as a major mechanism explaining the coexistence of closely related animal taxa. However, how such segregation varies throughout the annual cycle is poorly understood. Here, we examined the feeding ecology of the two subspecies of Cory's shearwater, Calonectris diomedea diomedea and Calonectris diomedea borealis , breeding in sympatry in a Mediterranean colony. To study trophic segregation at different stages, we combined the analysis of isotope values ( δ 15 N, δ 13 C) in blood obtained during incubation and in feathers moulted during chick-rearing and wintering periods with satellite-tracking data during the chick-rearing period. Satellite-tracking and stable isotope data of the first primary feather revealed that C. d. borealis foraged mainly in the Atlantic whereas C. d. diomedea foraged exclusively in the Mediterranean. This spatial segregation could reflect the foraging behaviour of the C. d. borealis individuals before they arrived at the Mediterranean colony. Alternatively, greater wing loading of C. d. borealis individuals may confer the ability to fly across the strong winds occurring at the at the Gibraltar strait. Isotope values of the eighth secondary feather also support segregation in wintering areas between the two forms: C. d. diomedea wintered mainly in association with the Canary current, whereas C. d. borealis wintered in the South African coast. Overall, our results show that spatial segregation in foraging areas can display substantial variation throughout the annual cycle and is probably a major mechanism facilitating coexistence between closely related taxa.

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Moulting strategies of a long‐distance migratory seabird, the Mediterranean Cory's ShearwaterCalonectris diomedea diomedea

Cited by 44 publications

References 52 publications

Differences in the timing and extent of annual moult of black-browed albatrosses Thalassarche melanophris living in contrasting environments

Differences in the timing and extent of annual moult of black-browed albatrosses Thalassarche melanophris living in contrasting environments

Seabird bycatch in Spanish Mediterranean large pelagic longline fisheries, 2000-2008

Foraging segregation between two closely related shearwaters breeding in sympatry

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