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2025

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Nesting Seabirds On The Kaikué-Lagartija Island Nature Sanctuary, Calbuco Archipelago, Southern Chile, Jaime A. Cursach, Jonnathan Vilugron, Jaime R. Rau, Carlos Oyarzun, Marcelo Provoste Jul 2025

Nesting Seabirds On The Kaikué-Lagartija Island Nature Sanctuary, Calbuco Archipelago, Southern Chile, Jaime A. Cursach, Jonnathan Vilugron, Jaime R. Rau, Carlos Oyarzun, Marcelo Provoste

Marine Ornithology

Kaikué-Lagartija Island, one of the few sites in the Calbuco Archipelago (southern Chile) that is still in its natural state, has been declared a Nature Sanctuary. However, little has been published regarding the island’s natural history. Here we describe the assemblage of nesting seabirds on Kaikué-Lagartija Island, including estimates of abundance, during the breeding seasons of 2012/13, 2014/15, and 2015/16 for eight species found nesting. The Magellanic Penguin Spheniscus magellanicus is the most abundant seabird on this island, with a breeding population of around 200 pairs. The number of nesting pairs of Kelp Gull Larus dominicanus increased from 17 to …

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The Black Noddy Anous Minutus: A New Breeding Species For Chile, Manuel Marín, Rodrigo González, Sergio Trucco Jul 2025

The Black Noddy Anous Minutus: A New Breeding Species For Chile, Manuel Marín, Rodrigo González, Sergio Trucco

Marine Ornithology

A small breeding population of Black Noddy Anous minutus was encountered on San Ambrosio Island in the Desventuradas Archipelago in the southeast Pacific off Chile. On 11 December 2019, we found eight Black Noddy nests among 50–60 nests of Brown Noddies A. stolidus. Black Noddy nests were placed on the ground with little to no nesting material in the interior of the island, which is an unusual nest type and placement for this species. All nests were at different stages, from recently hatched to recently fledged nestlings. Black Noddies usually nest in trees or bushes, but the vegetation on San …

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Ocean Heat Wave Induces Breeding Failure At The Southern Breeding Limit Of The Northern Gannet Morus Bassanus, William A. Montevecchi, Paul M. Regular, Jean-François Rail, Kyran Power, Chris Mooney, Kyle J.N. D’Entremont, Stefan Garthe, Leanne Guzzwell, Sabina I. Wilhelm Jul 2025

Ocean Heat Wave Induces Breeding Failure At The Southern Breeding Limit Of The Northern Gannet Morus Bassanus, William A. Montevecchi, Paul M. Regular, Jean-François Rail, Kyran Power, Chris Mooney, Kyle J.N. D’Entremont, Stefan Garthe, Leanne Guzzwell, Sabina I. Wilhelm

Marine Ornithology

We document unprecedented abandonments and breeding failures by Northern Gannets in eastern Canada at Cape St. Mary’s, Bonaventure Island, and the Magdalen Islands. These events were associated with a marine heat wave during chick rearing in the late summer of 2012. The rapid onset of abandonment at Cape St. Mary’s also coincided with intense lightning and thunder during an overnight storm. Parental desertions at all colonies were transient, resolving over a period of weeks, and appeared to be food-related, resulting in the poorest breeding success on record for each of these colonies. The Northern Gannet’s primary prey during the breeding …

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Multidecadal Comparison Of Red-Footed Booby Sula Sula Diet At Ulupa'u Crater, O'Ahu, Hawai'i, Sarah E. Donahue, Josh Adams, K. David Hyrenbach Jul 2025

Multidecadal Comparison Of Red-Footed Booby Sula Sula Diet At Ulupa'u Crater, O'Ahu, Hawai'i, Sarah E. Donahue, Josh Adams, K. David Hyrenbach

Marine Ornithology

We describe the diet of Red-footed Boobies Sula sula nesting at Ulupa‘u Crater, O‘ahu, Hawai‘i based on 106 regurgitations collected during 2014 and 2015. We also compare our results to a diet study at this colony five decades earlier. Both studies indicate that flying squid (Ommastrephidae) and flyingfish (Exocoetidae) are important prey for this population while provisioning chicks. In particular, Purpleback Flying Squid Sthenoteuthis oualaniensis occurred in the majority (> 70%) of the recent regurgitation samples, and their size (mantle length < 11 cm) indicates that they were mostly juveniles. Moreover, the size distribution of the squid prey varied by year, indicating inter-annual variability in the phenology of spawning and larval development. This study highlights the reliance of Red-footed Boobies on juveniles of this poorly-studied squid and underscores their value as biological samplers of epipelagic fish and squid within their foraging ranges.

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Non-Breeding Movements And Foraging Ecology Of The Black Guillemot Cepphus Grylle In Atlantic Canada, Julia E. Baak, Marty L. Leonard, Carina Gjerdrum, Mark D. Dodds, Robert A. Ronconi Jul 2025

Non-Breeding Movements And Foraging Ecology Of The Black Guillemot Cepphus Grylle In Atlantic Canada, Julia E. Baak, Marty L. Leonard, Carina Gjerdrum, Mark D. Dodds, Robert A. Ronconi

Marine Ornithology

Understanding the movements of seabirds, which are important ecological indicators, can provide new insights into physical and biological aspects of the marine environment. This information can also be used in planning marine conservation and oil spill response strategies. Though Black Guillemots Cepphus grylle are widely distributed in the coastal waters of eastern and arctic Canada, little is known about their movements during the non-breeding season. We used a combination of global location sensors and stable-isotope analyses on Black Guillemots breeding on Country Island, Nova Scotia, Canada and on Kent Island, New Brunswick, Canada to examine their non-breeding movements and trophic …

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Trends In Radar Counts Of Marbled Murrelets Brachyramphus Marmoratus In British Columbia (1996-2018): Effects Of 'The Blob' Marine Heatwave And Prey Fish Abundance, Mark C. Drever, Murdoch K. Mcallister, Douglas F. Bertram, Bernard K. Schroeder, Kerry J. Woo Jul 2025

Trends In Radar Counts Of Marbled Murrelets Brachyramphus Marmoratus In British Columbia (1996-2018): Effects Of 'The Blob' Marine Heatwave And Prey Fish Abundance, Mark C. Drever, Murdoch K. Mcallister, Douglas F. Bertram, Bernard K. Schroeder, Kerry J. Woo

Marine Ornithology

During 2014–2016, the northeast Pacific Ocean experienced a large-scale marine heatwave (nicknamed ‘The Blob’), an event that was associated with die-offs of several marine bird species. The Marbled Murrelet Brachyramphus marmoratus is a small seabird in this region for which we evaluated trends in abundance—for the purposes of conservation planning—during radar surveys at 58 sites in coastal British Columbia, from 1996 to 2018, and for which we determined whether trends may have been affected by ‘The Blob’. A hierarchical Bayesian model allowed us to separate long-term trends from short-term annual fluctuations (‘year effects’) that might have resulted from changes in …

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Population Decline And Breeding Distribution Changes Of Magnificent Frigatebirds Fregata Magnificens In Baja California Sur, Gerardo Marrón, Adriana Hernández-Alvarez, Roberto Carmona, Sergio Águila Jul 2025

Population Decline And Breeding Distribution Changes Of Magnificent Frigatebirds Fregata Magnificens In Baja California Sur, Gerardo Marrón, Adriana Hernández-Alvarez, Roberto Carmona, Sergio Águila

Marine Ornithology

The Magnificent Frigatebird Fregata magnificens (MaFr) is a tropical seabird species that is widely distributed along the mid-latitude coasts of the Americas. Historically, its most important breeding location has been Estero Las Tijeras in the Magdalena Lagoon complex (MLC), Baja California Sur, Mexico. Our recent data indicate a severe (~96%) population decline at this location. In 2002–2003, 33535 MaFr were counted in all of the MLC, and historical data (1985–1986) support the maintenance of consistently high numbers of MaFr in this region over time. Yet, MaFr abundance dropped severely—to ~1 200 individuals—in 2015. This low abundance persisted into 2017, when …

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Underwater Behavior Of Christmas Shearwaters Puffinus Nativitatis From Kure Atoll, Ilana Nimz, Mark A. Renshaw, Matthew Iacchei, Eric Vanderwerf, Cynthia Vanderlip, Matthew Saunter, Naomi Worcester, K. David Hyrenbach Jul 2025

Underwater Behavior Of Christmas Shearwaters Puffinus Nativitatis From Kure Atoll, Ilana Nimz, Mark A. Renshaw, Matthew Iacchei, Eric Vanderwerf, Cynthia Vanderlip, Matthew Saunter, Naomi Worcester, K. David Hyrenbach

Marine Ornithology

The Christmas Shearwater Puffinus nativitatis is an aquatic, tropical shearwater. While individuals of this species are known to forage by pursuit plunging and diving, there are no published reports quantifying their sub-surface foraging behavior. We obtained diving information from eight chick-rearing Christmas Shearwaters on Kure Atoll during June–August 2017. Over the 33 days during which instruments were deployed, 1521 dives were recorded. Individual deployments lasted three to eight days and were independent of the maximum depths recorded. Individual maximum depths were 10.7–24.1 m, averaging 15.4 m. While the deepest and longest recorded dive reached 24.1 m and lasted 31 s, …

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Stable Isotope Analysis Of Multiple Tissues From Chick Carcasses Of Three Pygoscelid Penguins In Antarctica, Yanina A. Ciriani, Mariana A. Juáres, M. Mercedes Santos, Steven D. Emslie Jul 2025

Stable Isotope Analysis Of Multiple Tissues From Chick Carcasses Of Three Pygoscelid Penguins In Antarctica, Yanina A. Ciriani, Mariana A. Juáres, M. Mercedes Santos, Steven D. Emslie

Marine Ornithology

Many types of animal tissues are increasingly being used for stable isotope analysis, with their application dependent on the time frame they reflect and their availability for collection. Here, we investigated the isotopic values (δ13C and δ15N) of four tissues (feather, skin, toenail, and bone) collected from fledgling-period chick carcasses of three species of pygoscelid penguins to compare the variability and accuracy of the data among tissues. Samples were collected at 25 de Mayo/King George Island during the 2017/18 austral summer. Chick carcasses are commonly found at active penguin colonies, and “opportunistic sampling” can easily be performed without disturbing nesting …

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Masthead, Pacific Seabird Group Jul 2025

Masthead, Pacific Seabird Group

Marine Ornithology

No abstract provided.

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Inside Front Cover, Pacific Seabird Group Jul 2025

Inside Front Cover, Pacific Seabird Group

Marine Ornithology

No abstract provided.

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Author Instructions, Pacific Seabird Group Jul 2025

Author Instructions, Pacific Seabird Group

Marine Ornithology

No abstract provided.

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Reviews: Journal Of A Voyage: Federico Craveri And The Gulf Of California In 1856 (Craveri, F.; T. Bowen [Ed.], B. D'Arpa And B. Cavatorta [Translators]); How To Be An Antiracist (Kendi, I.X.); The Skin We're In: A Year Of Black Resistance And Power (Cole, D.); Hawai'i'S White Tern: Manu-O-Ku, An Urban Seabird (Scott, S.), Daniel W. Anderson, Rachel T. Buxton, David Ainley, Louise Blight, Jenna Cragg, Benjamin Saenz, Lindsay Young Jul 2025

Reviews: Journal Of A Voyage: Federico Craveri And The Gulf Of California In 1856 (Craveri, F.; T. Bowen [Ed.], B. D'Arpa And B. Cavatorta [Translators]); How To Be An Antiracist (Kendi, I.X.); The Skin We're In: A Year Of Black Resistance And Power (Cole, D.); Hawai'i'S White Tern: Manu-O-Ku, An Urban Seabird (Scott, S.), Daniel W. Anderson, Rachel T. Buxton, David Ainley, Louise Blight, Jenna Cragg, Benjamin Saenz, Lindsay Young

Marine Ornithology

No abstract provided.

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Time-Lapse Imagery Of Peruvian Boobies Sula Variegata Reveals Nest Abandonment Caused By Tick Hyperinfestation, Cristina Burga-Domínguez, Diego D. Gonzales-Delcarpio, Carlos B. Zavalaga Jul 2025

Time-Lapse Imagery Of Peruvian Boobies Sula Variegata Reveals Nest Abandonment Caused By Tick Hyperinfestation, Cristina Burga-Domínguez, Diego D. Gonzales-Delcarpio, Carlos B. Zavalaga

Marine Ornithology

Severe tick infestation in seabird colonies causes discomfort in reproductive adults, offspring mortality, and nest abandonment. This study used time-lapse cameras to examine the relationship between Ornithodoros amblus tick infestation and Peruvian Booby Sula variegata nest abandonment in four locations along the Peruvian coast between August 2016 and November 2018. The percent occurrence of discomfort in nesting birds (preening and standing on the nest) recorded by the cameras was used as an indicator of tick infestation. The tick density inside and outside the abandoned colonies was also evaluated. In five of the six colonies, complete nest abandonment occurred over an …

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Seasonal Changes In Diving And Flying Activities Of Rhinoceros Auklets Cerorhinca Monocerata Throughout The Non-Breeding Period, Ui Shimabukuro, Akinori Takahashi Jul 2025

Seasonal Changes In Diving And Flying Activities Of Rhinoceros Auklets Cerorhinca Monocerata Throughout The Non-Breeding Period, Ui Shimabukuro, Akinori Takahashi

Marine Ornithology

To understand how migratory seabirds meet the energetic challenges associated with wing molt and wintering, a full annual cycle behavioral study is needed. We studied the diving and flying activities of three Rhinoceros Auklets Cerorhinca monocerata migrating in the northwestern Pacific. The auklets decreased daily flight time and dive depth for seven weeks from the end of summer, presumably associated with primary feather molt. In winter, they increased dive depth (~81 m) and daily dive time. We suggest that Rhinoceros Auklets adjust their diving and flying behaviors in response to wing molt and energy demands in winter

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Number And Distribution Records Of Caspian Tern Hydroprogne Caspia In Indonesia, With Special Reference To Sumatra, Muhammad Iqbal, Yus Rusila Noor, Deni Mulyana, Henni Martini, Ferry Hasudungan, Iwan Febrianto, Fransisca Noni Tirtaningtyas, Arum Setiawan, Indra Yustian, Hilda Zulkifli Jul 2025

Number And Distribution Records Of Caspian Tern Hydroprogne Caspia In Indonesia, With Special Reference To Sumatra, Muhammad Iqbal, Yus Rusila Noor, Deni Mulyana, Henni Martini, Ferry Hasudungan, Iwan Febrianto, Fransisca Noni Tirtaningtyas, Arum Setiawan, Indra Yustian, Hilda Zulkifli

Marine Ornithology

We summarize all reports of Caspian Tern Hydroprogne caspia recorded in Indonesia, with particular focus on Sumatra (1983–2019). There were 29 records in total, which together indicate that the Caspian Tern is a regular visitor to Indonesia, in contrast to previous assumptions that it is rare. This species has been recorded during the non-breeding period (September to March in Indonesia, and August to April in Sumatra) in small numbers ranging from one to 40 birds. Many potential sites for this species, particularly along east coast of Sumatra, have still not been well explored. Additional search efforts will advance our knowledge …

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Avifauna Associated With An Otter-Trawl Fishery In A Tropical Estuary, Natalie Villar Freret-Meurer, José Vanderli Andreata, Maria Alice S. Alves Jul 2025

Avifauna Associated With An Otter-Trawl Fishery In A Tropical Estuary, Natalie Villar Freret-Meurer, José Vanderli Andreata, Maria Alice S. Alves

Marine Ornithology

Otter trawls are commonly used in fisheries for benthic fishes, and they provide a source of food to many marine birds. This study aimed to quantify the response of birds, by species, attracted to forage at fishing vessels in Ribeira Bay, Angra dos Reis, Rio de Janeiro, Brazil. Sampling was conducted every two months in 2006 at five stations, for a total of 30 trawls; fish were collected for 20 minutes per trawl. Bird counts were recorded just before the trawling started, when it began, 10 minutes after trawling began, and 10 minutes after it stopped. After trawling, 10 fresh …

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Trends In Density, Abundance, And Response To Storm Damage For Westland Petrels Procellaria Westlandica, 2007-2019, Susan M. Waugh, Christophe Barbraud, Karine Delord, Kate L.J. Simister, G. Barry Baker, Georgie K. Hedley, Kerry-Jayne Wilson, Douglas R.D. Rands Jul 2025

Trends In Density, Abundance, And Response To Storm Damage For Westland Petrels Procellaria Westlandica, 2007-2019, Susan M. Waugh, Christophe Barbraud, Karine Delord, Kate L.J. Simister, G. Barry Baker, Georgie K. Hedley, Kerry-Jayne Wilson, Douglas R.D. Rands

Marine Ornithology

The density and distribution of Westland Petrel burrows was assessed over a 12-year period (2007–2019). During that time, burrow density increased while occupancy remained stable, commensurate with an annual population growth rate of 1.022 (95% confidence interval: 0.971–1.076), as estimated using mark recapture data. From our surveys, we estimated a 2019 baseline population of ~6200 breeding pairs and a world population of 13 800–17600 individuals, covering around 95% of the population. Transects were conducted to establish the location and density of 17 petrel sub-colonies in rugged, untracked terrain in Paparoa National Park, West Coast, New Zealand. Major storms in 2014–2018 …

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Nightly Colony Attendance Patterns Of Provisioning Cassin's Auklet Ptychoramphus Aleuticus Are Consistent And Synchronous, Laura Mcfarlane Tranquilla, John L. Ryder, Louise K. Blight, Patrick D. O’Hara, Douglas F. Bertram Jul 2025

Nightly Colony Attendance Patterns Of Provisioning Cassin's Auklet Ptychoramphus Aleuticus Are Consistent And Synchronous, Laura Mcfarlane Tranquilla, John L. Ryder, Louise K. Blight, Patrick D. O’Hara, Douglas F. Bertram

Marine Ornithology

We conducted a multi-year (1999–2001) radio telemetry study to determine patterns of colony attendance among breeding Cassin’s Auklets Ptychoramphus aleuticus during the chick-rearing period on Triangle Island in British Columbia, Canada. A total of 1 625 detections were obtained for 80 individual birds (24–28 birds per year), each detected 20.3 times on average. We found that colony attendance (arrival times, departure times, in-burrow shift duration) and foraging trip duration (i.e., time away from the colony) were remarkably synchronous among individuals and years. On average, birds arrived in a pulse after darkness, with 67% of returns between 23h15 and 00h15 and …

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Responses Of Sympatric Shearwaters To Supplemental Food Under Varying Natural Prey Availability On The Wintering Grounds Of Coastal Newfoundland, Canada, Paloma C. Carvalho, Laurie D. Maynard, Gail K. Davoren Jul 2025

Responses Of Sympatric Shearwaters To Supplemental Food Under Varying Natural Prey Availability On The Wintering Grounds Of Coastal Newfoundland, Canada, Paloma C. Carvalho, Laurie D. Maynard, Gail K. Davoren

Marine Ornithology

Species tend to concentrate in areas with high prey availability, which could lead to competitive interactions within a feeding assemblage as resources become depleted. In coastal Newfoundland, Canada, capelin Mallotus villosus is the focal forage fish species that many top predators feed on during the summer; however, inshore availability varies throughout the boreal summer when abundant aggregations migrate inshore to spawn. We investigated the interactions and responses of Great Shearwaters Ardenna gravis and Sooty Shearwaters A. grisea during their non-breeding season to supplemental food supply under changing natural prey availability (higher and lower capelin availability) by conducting an at-sea experiment …

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Wedge-Tailed Shearwater Ardenna Pacifica Fallout Patterns Inform Targeted Management, Brooke Friswold, Keith Swindle, David Hyrenbach, Melissa R. Price Jul 2025

Wedge-Tailed Shearwater Ardenna Pacifica Fallout Patterns Inform Targeted Management, Brooke Friswold, Keith Swindle, David Hyrenbach, Melissa R. Price

Marine Ornithology

Seabird fledglings are often attracted to artificial, bright lights, leading to their grounding. This phenomenon is termed “fallout” and is associated with an increased risk of mortality from land-based threats. This study evaluated temporal trends and spatial factors, such as fallout clustering near lights and proximity to colonies, to inform targeted management actions. Standardized surveys were conducted from 2002 to 2010 for Wedge-tailed Shearwater Ardenna pacifica (WTSH) fallout on the island of O‘ahu, Hawai‘i, USA. First, yearly fallout counts along the transect showed a two-year cycle and identified 25 November as the date with the highest fallout across years. Second, …

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Spatiotemporal Characterization Of Non-Breeding Great Shearwaters Ardenna Gravis Within Their Wintering Range, Kevin D. Powers, David N. Wiley, Anna R. Robuck, Zachary H. Olson, Linda J. Welch, Michael A. Thompson, Les Kaufman Jul 2025

Spatiotemporal Characterization Of Non-Breeding Great Shearwaters Ardenna Gravis Within Their Wintering Range, Kevin D. Powers, David N. Wiley, Anna R. Robuck, Zachary H. Olson, Linda J. Welch, Michael A. Thompson, Les Kaufman

Marine Ornithology

Movements of Great Shearwaters Ardenna gravis wintering in the Northwest Atlantic showed age-based spatial and temporal flexibility, with foraging tactics linked to a defined physical preference of their primary prey. From 2013 to 2018, we tracked 58 Great Shearwaters during their wintering season using platform terminal transmitters deployed in the same area of the southwest Gulf of Maine. Utilization distributions (UDs) for individual birds were created from convex hulls, which were then combined for spatial and temporal analyses. Of the 95% kernel UDs, 55% were contained within the Gulf of Maine and the remainder extended to the Scotian Shelf off …

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Foraging Ranges Of Humboldt Penguins Spheniscus Humboldti From Tilgo Island: The Critical Need For Protecting A Unique Marine Habitat, René Quispe, Miriam Lerma, Nicolás Luna, Matías Portflitt-Toro, Juan Serratosa, Guillermo Luna-Jorquera Jul 2025

Foraging Ranges Of Humboldt Penguins Spheniscus Humboldti From Tilgo Island: The Critical Need For Protecting A Unique Marine Habitat, René Quispe, Miriam Lerma, Nicolás Luna, Matías Portflitt-Toro, Juan Serratosa, Guillermo Luna-Jorquera

Marine Ornithology

The largest population of Humboldt Penguins resides in a fertile archipelago of the north-central coast of Chile, formed by eight islands in proximity to upwelling centers of the Humboldt Current System. However, five of these islands lack legal protection. Here, we report the results of breeding Humboldt Penguins tracked while foraging from Tilgo Island. The average and maximum foraging radii around the colony were 22 km and 43 km, respectively. Our data indicate that trip ranges overlap areas proposed for industrial projects. Because Humboldt Penguins are sentinels of local ecosystem health, this underscores the value of expanding conservation zones in …

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Manx Shearwaters Puffinus Puffinus Breeding In The Western Atlantic Follow A Different Migration Route From Their Eastern Atlantic Conspecifics, Annette L. Fayet, Paula Shannon, Donald E. Lyons, Stephen W. Kress Jul 2025

Manx Shearwaters Puffinus Puffinus Breeding In The Western Atlantic Follow A Different Migration Route From Their Eastern Atlantic Conspecifics, Annette L. Fayet, Paula Shannon, Donald E. Lyons, Stephen W. Kress

Marine Ornithology

Manx Shearwaters are transequatorial migrants, and most of the world’s population breeds in Britain and winters off the Patagonian Shelf in the western South Atlantic. The migration route of British birds follows a well-known clockwise movement between the North and South Atlantic, taking advantage of the winds. Whether this main Manx Shearwater migration corridor is used by the smaller populations breeding in the western North Atlantic is unknown. Here, we report our findings from tracking two adults from a newly-established colony of Manx Shearwaters in Maine, USA using miniature geolocators. The tracked shearwaters followed a post-breeding migration route southward along …

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Records Of White Tern Gygis Alba In Panama And Potential Connections To El Niño Events, Daniel Buitrago-Rosas, Jorge L. Medina, Pedro L. Castillo-Caballero Jul 2025

Records Of White Tern Gygis Alba In Panama And Potential Connections To El Niño Events, Daniel Buitrago-Rosas, Jorge L. Medina, Pedro L. Castillo-Caballero

Marine Ornithology

In Panama, the White Tern Gygis alba is a vagrant seabird that has been reported very rarely. Its first record was in 1983, during a very strong El Niño Southern Oscillation (ENSO) event that generated a massive invasion of unusual seabirds from South America into the Panama Bay. Unlike other vagrant seabirds, the White Tern remained unrecorded again until 2016. This note reports the second, and first confirmed, occurrence of White Tern to Panama, along with separate confirmed sightings in 2019. We briefly review these records and their potential connections to ENSO events.

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Camera Trapping Reveals Cooperative Breeding In The Red-Footed Booby Sula Sula, Matthieu Le Corre, Morgane Manoury, Sabine Orlowski, Florent Bignon, Gabrielle Dicque Jul 2025

Camera Trapping Reveals Cooperative Breeding In The Red-Footed Booby Sula Sula, Matthieu Le Corre, Morgane Manoury, Sabine Orlowski, Florent Bignon, Gabrielle Dicque

Marine Ornithology

Cooperative breeding occurs in only 9% of bird species and is particularly rare among seabirds. We provide evidence that cooperative breeding occurs in a tropical seabird, the Red-footed Booby. Through camera monitoring of active nests, we found one nest in which a chick was raised by a trio of birds: its two parents and an immature bird. The immature bird fed the chick, guarded it, and preened it. The parents did not behave aggressively towards the immature bird when it approached the chick, suggesting that this trio was stable and composed of birds that knew each other. The growth of …

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Identification Of Foraging Areas And Movements Of Royal Tern Thalasseus Maximus At The Isles Dernieres Barrier Islands Refuge, Louisiana, Virginie Rolland, Megan Nepshinsky, Eva D. Windhoffer, Jeff S. Liechty, Ashlee K. Minor, Aaron R. Pierce Jul 2025

Identification Of Foraging Areas And Movements Of Royal Tern Thalasseus Maximus At The Isles Dernieres Barrier Islands Refuge, Louisiana, Virginie Rolland, Megan Nepshinsky, Eva D. Windhoffer, Jeff S. Liechty, Ashlee K. Minor, Aaron R. Pierce

Marine Ornithology

The Isles Dernieres Barrier Island Refuge (IDBIR) in Louisiana constitutes a major colonial seabird breeding site but is also considered a high-risk marine area that is susceptible to both natural and anthropogenic disturbances that can be detrimental to breeding areas and food resources. The objective of this study was to track the movements of breeding Royal Terns Thalasseus maximus at the IDBIR to identify important foraging movement parameters and foraging areas. GPS loggers were attached to six Royal Terns during the 2014–2017 breeding seasons. Mean foraging trip distance was 28.8 km and the maximum distance traveled was 47.8 km. The …

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Recent Records Of Little Cormorant Microcarbo Niger In Sumatra, Indonesia, Arum Setiawan, Muhammad Iqbal, Pormansyah, Indra Yustian, Hilda Zulkifli Jul 2025

Recent Records Of Little Cormorant Microcarbo Niger In Sumatra, Indonesia, Arum Setiawan, Muhammad Iqbal, Pormansyah, Indra Yustian, Hilda Zulkifli

Marine Ornithology

We summarize observations of the Little Cormorant Microcarbo niger in Sumatra from 2016 to 2019. Based on these observations, we suggest that Little Cormorant has become widespread in Sumatra.

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First Evidence Of Plastic Ingestion By Red-Billed Tropicbirds Phaethon Aethereus From St. Eustatius, Caribbean Netherlands, Hannah Madden, Eline Eggermont Jul 2025

First Evidence Of Plastic Ingestion By Red-Billed Tropicbirds Phaethon Aethereus From St. Eustatius, Caribbean Netherlands, Hannah Madden, Eline Eggermont

Marine Ornithology

We present the first confirmed evidence of plastic ingestion by a Red-billed Tropicbird on the Caribbean Netherlands island of St. Eustatius, which supports a regionally important nesting population. With our observations, all species of tropicbird have now been documented ingesting marine plastic pollution.

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Behavioral Responses To A Novel Feeding Problem In The Olrog's Gull Larus Atlanticus, Melina V. Castano, Laura M. Biondi, Francisco Zumpano, Marco Favero, Germán O. García Jul 2025

Behavioral Responses To A Novel Feeding Problem In The Olrog's Gull Larus Atlanticus, Melina V. Castano, Laura M. Biondi, Francisco Zumpano, Marco Favero, Germán O. García

Marine Ornithology

Behavioral innovation is considered an expression of behavioral flexibility and is a source of phenotypic plasticity in animals. In this study, we explored the main components of behavioral innovation (neophobia and exploratory behavior) with respect to social context and age in the Olrog’s Gull Larus atlanticus. Twenty consecutive experimental sessions were performed, involving presentation of a plexiglass box containing food; the box could be opened and reached by pushing or pulling different lids, each leading to a food reward. Gulls were able to decrease their neophobic response throughout the course of the experiments. Fifty-three percent of individuals who entered the …

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