Migration routes and non-breeding areas of Common Terns (<i>Sterna hirundo</i>) from the Azores

Neves, Verónica C.; Nava, Cristina; Cormons, Matt; Bremer, Esteban; Castresana, Gabriel; Lima, Pedro Cerqueira; Azevedo, Severino Mendes de; Phillips, Richard A.; Magalhães, M. Clara F.; Santos, Ricardo S.

doi:10.1071/mu13112

Cited by 12 publications

(6 citation statements)

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“…The northward movement of both Croatian birds in late February could be described either as winter movement or the start of the prenuptial migration; late February is a period of departure from wintering grounds for terns breeding in Germany and wintering along east African coasts (Becker et al 2016). On the other hand, substantial movements during winter were reported for other Common Tern populations (Neves et al 2015;Bracey et al 2018). The area where Croatian birds spent late February and early March lays further south than the wintering area of two Hungarian terns revealed by this study.…”

Section: Table 2 Summary Of Hungarian-and Croatian-related Recoveriescontrasting

confidence: 45%

“…Birds observed in the second and third calendar year were labelled as immatures, while birds in the 4th year and older were considered to be adults. As Common Terns showed large differences in the timing of migration between years (see Neves et al 2015;Becker et al 2016; authors' personal observation), recoveries were assigned into stages of the annual cycle according to both time period and recovery locality. In general, spring migration lasted from March to May, the breeding period from May to early August, post-breeding dispersal and prospecting of immature birds from late June to August, autumn migration from August to November and wintering from December to early March.…”

Section: Methodsmentioning

confidence: 99%

“…Previous geolocator studies on Common Terns were conducted on populations breeding along marine coasts of North America (Nisbet et al 2011) and Europe (Becker et al 2016), on the Azores (Neves et al 2015) and on North American lakes (Bracey et al 2018). Geolocator tracking of German North Sea populations already helped to describe the migration route, stopover locations and wintering sites along the coast of western Africa (Becker et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Geolocator study reveals east African migration route of Central European Common Terns

et al. 2020

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Background: The majority of European Common Terns (Sterna hirundo) migrate south along the western coast of Europe and Africa, while birds from eastern regions are known to cross the Mediterranean Sea from east to west or migrate along the eastern African coast. The migration route of north European terns wintering along the coast of western Africa was already described using geolocator data, while knowledge about movements of the European inland populations is based only on relatively scarce recoveries of ringed birds. Methods: We used light-level geolocators in inland Common Tern colonies in Hungary and Croatia to study their migration route and to identify wintering areas along with stopover sites. Results revealed by geolocators were compared with recoveries of ringed birds. Results: All tracked birds used the east African migration route with autumn stopovers at Lower Nile and in the southern part of the Red Sea, and short spring stopover in Israel. Terns wintered along Kenyan coasts and in the southern Mozambique Channel. Autumn migration lasted four times longer than spring migration. Conclusions: This is the first geolocator study that describes the east African migration route of the Common Tern. Important stopover sites were identified. More studies of inland populations are needed to better elucidate tern winter movements.

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Section: Table 2 Summary Of Hungarian-and Croatian-related Recoveriescontrasting

confidence: 45%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geolocator study reveals east African migration route of Central European Common Terns

et al. 2020

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“…In short, the Azores hosts multiple essential megafauna habitats (EMH) for the north Atlantic populations of all four key groups of vulnerable/endangered marine megafauna combined (marine mammals, seabirds, sea turtles, fishes), be them feeding, mating, spawning, pupping, or even resting grounds during their large scale migrations. In addition, documented large-scale migrations, from both Azorean and non-Azorean-based tracking studies, directly connect these EMH in the Azores to the eastern and western north Atlantic and/or to the arctic waters and the tropical/equatorial regions at the individual spatial ecology level of several whales (Silva et al, 2013;Prieto et al, 2014Prieto et al, , 2017, seabirds (González-Solís et al, 2007;Neves et al, 2015;Ramos et al, 2015), turtles (Bolten et al, 1998), sharks (Afonso et al, 2014a;Thorrold et al, 2014;Vandeperre et al, 2014) and tuna/billfishes (Druon et al, 2016) (Figure 1).…”

Section: A Mid-atlantic Hub For Oceanic Megafaunamentioning

confidence: 99%

The Azores: A Mid-Atlantic Hotspot for Marine Megafauna Research and Conservation

et al. 2020

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The increasing public perception that marine megafauna is under threat is an outstanding incentive to investigate their essential habitats (EMH), their responses to human and climate change pressures, and to better understand their largely unexplained behaviors and physiology. Yet, this poses serious challenges such as the elusiveness and remoteness of marine megafauna, the growing scrutiny and legal impositions on their study, and difficulties in disentangling environmental drivers from human disturbance. We argue that advancing our knowledge and conservation on marine megafauna can and should be capitalized in regions where exceptional access to multiple species (i.e., megafauna 'hotspots') combines with the adequate legal framework, sustainable practices, and research capacity. The wider Azores region, hosting EMHs of all key groups of vulnerable or endangered vertebrate marine megafauna, is a singular EMH hotspot on a migratory crossroads, linking eastern and western Atlantic margins and productive boreal waters to tropical seas. It benefits from a sustainable development model based on artisanal fisheries with zero or minor megafauna bycatch, and one of the largest marine protected area networks in the Atlantic covering coastal, oceanic and deepsea habitats. Developing this model can largely ensure the future integrity of this EMH hotspot while fostering cuttingedge science and technological development on megafauna behavior, biologging and increased ocean observation, with potential major impacts on the Blue Growth agenda. An action plan is proposed.

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“…Additional monitoring methods, such as water immersion loggers [46], are needed to further clarify the behaviour of migrating Arctic terns.…”

Section: Ternsmentioning

confidence: 99%

Sleeping on the wing

Rattenborg¹

2017

Interface Focus.

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Wakefulness enables animals to interface adaptively with the environment. Paradoxically, in insects to humans, the efficacy of wakefulness depends on daily sleep, a mysterious, usually quiescent state of reduced environmental awareness. However, several birds fly non-stop for days, weeks or months without landing, questioning whether and how they sleep. It is commonly assumed that such birds sleep with one cerebral hemisphere at a time (i.e. unihemispherically) and with only the corresponding eye closed, as observed in swimming dolphins. However, the discovery that birds on land can perform adaptively despite sleeping very little raised the possibility that birds forgo sleep during long flights. In the first study to measure the brain state of birds during long flights, great frigatebirds ( Fregata minor ) slept, but only during soaring and gliding flight. Although sleep was more unihemispheric in flight than on land, sleep also occurred with both brain hemispheres, indicating that having at least one hemisphere awake is not required to maintain the aerodynamic control of flight. Nonetheless, soaring frigatebirds appeared to use unihemispheric sleep to watch where they were going while circling in rising air currents. Despite being able to engage in all types of sleep in flight, the birds only slept for 0.7 h d −1 during flights lasting up to 10 days. By contrast, once back on land they slept 12.8 h d −1 . This suggests that the ecological demands for attention usually exceeded that afforded by sleeping unihemispherically. The ability to interface adaptively with the environment despite sleeping very little challenges commonly held views regarding sleep, and therefore serves as a powerful system for examining the functions of sleep and the consequences of its loss.

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Migration routes and non-breeding areas of Common Terns (Sterna hirundo) from the Azores

Abstract: Abstract. Here we report migration routes and non-breeding areas of Common Terns (Sterna 34hirundo

Cited by 12 publications

References 20 publications

Geolocator study reveals east African migration route of Central European Common Terns

Geolocator study reveals east African migration route of Central European Common Terns

The Azores: A Mid-Atlantic Hotspot for Marine Megafauna Research and Conservation

Sleeping on the wing

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