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At-Sea Movements Of The White Tern Gygis Alba In Waters Off Eastern Australia, Nicholas Carlile, Terence O’Dwyer Jul 2025

At-Sea Movements Of The White Tern Gygis Alba In Waters Off Eastern Australia, Nicholas Carlile, Terence O’Dwyer

Marine Ornithology

We present the first tracked movements of the medium-sized tropical White Tern Gygis alba, using Global Location Sensors (GLS), from a breeding colony on Lord Howe Island, South Pacific, Australia. The tracking period encompassed pre-breeding in 2018 to potential chick provisioning in the following season. Terns remained near Lord Howe Island during breeding, with some pre-egg-laying and post-nest failure trips 1 000 km distant. The average departure date from Lord Howe Island was 08 April (range: 21 March–22 April). The tern’s migration route was northwest towards the eastern Australian coast, skirting the Great Barrier Reef. Terns then spent the non-breeding …

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Atlantic Yellow-Nosed Albatross Thalassarche Chlororhynchos Feeding On A Dead Sea Turtle, Fabio Schunck, Patrick Pina, Fábio Barata, Fábio Olmos Jul 2025

Atlantic Yellow-Nosed Albatross Thalassarche Chlororhynchos Feeding On A Dead Sea Turtle, Fabio Schunck, Patrick Pina, Fábio Barata, Fábio Olmos

Marine Ornithology

Albatrosses mostly forage for fish, squid, and crustaceans (including discards from fishing vessels), but they also scavenge animal carcasses, a behavior still poorly characterized for some albatross species. In July 2021 during a pelagic birding trip off the coast of São Paulo State, Southeast Brazil, three Atlantic Yellow-nosed Albatross Thalassarche chlororhynchos were spotted feeding on the floating carcass of a Loggerhead Sea Turtle Caretta caretta. This behavior had not been previously documented in the literature, on-line citizen science platforms, or by personal observations. We believe this to be an uncommon feeding strategy for this albatross species.

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Owl Depredation At A Re-Establishing Colony Of White-Faced Storm Petrel Pelagodroma Marina, Nicholas Carlile, Chris Lloyd Jul 2025

Owl Depredation At A Re-Establishing Colony Of White-Faced Storm Petrel Pelagodroma Marina, Nicholas Carlile, Chris Lloyd

Marine Ornithology

We report the depredation by a single Eastern Barn Owl Tyto javanica delicatula on prospecting White-faced Storm Petrels Pelagodroma marina during the re-establishment phase of a colony on Big Island, off Port Kembla, New South Wales, Australia in 2018. Storm petrels were likely extirpated from this colony 56 years previously when invasive weeds rendered their habitat inaccessible. Restoration of vegetation together with storm petrel call broadcasting, commencing in 2014, resulted in significant increases in prospecting numbers, culminating in breeding (three pairs) in the 2017/18 austral summer season. A significant depredation event (> 59 adults) occurred between August and September 2018, …

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Observations Of Leucistic ʻUaʻU (Hawaiian Petrel Pterodroma Sandwichensis) On LānaʻI, HawaiʻI, André F. Raine, Rachel S. Sprague Jul 2025

Observations Of Leucistic ʻUaʻU (Hawaiian Petrel Pterodroma Sandwichensis) On LānaʻI, HawaiʻI, André F. Raine, Rachel S. Sprague

Marine Ornithology

The ‘Ua‘u (Hawaiian Petrel Pterodroma sandwichensis) is an endangered petrel endemic to the Hawaiian Islands. In this short paper, we describe two cases of Hawaiian Petrels with leucistic plumage recorded on the island of La¯na‘i. In both cases, the birds were chicks that fledged successfully in different years from the same burrow. There is only one other documented case of leucism recorded for this species in the Hawaiian Islands despite intensive monitoring of petrel burrows on Kaua‘i, La¯na‘i, and Maui over the last few decades, highlighting the rarity of this plumage aberration.

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Foraging Areas Of Nesting Ainley's Storm Petrel Hydrobates Cheimomnestes, Fernando Medrano, Sarah Saldanha, Julio Hernández-Montoya, Yuliana Bedolla-Guzmán, Jacob González-Solís Jul 2025

Foraging Areas Of Nesting Ainley's Storm Petrel Hydrobates Cheimomnestes, Fernando Medrano, Sarah Saldanha, Julio Hernández-Montoya, Yuliana Bedolla-Guzmán, Jacob González-Solís

Marine Ornithology

Acquiring basic knowledge such as at-sea distribution is often difficult for cryptic seabird species. Northern storm petrels (Hydrobatidae) are one family of seabirds that includes several cryptic species, including Ainley’s Storm Petrel Hydrobates cheimomnestes, which appears quite similar to southern Leach’s H. leucorhous and Townsend’s H. socorroensis Storm Petrels when at sea. For the first time, we describe the at-sea distribution of breeding Ainley’s Storm Petrels obtained using GPS tracking. We found that these birds visit waters of the eastern North Pacific between central Baja California, Mexico and southern Alta California, USA. These findings expand existing knowledge of the range …

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Successful Breeding By Black-Legged Kittiwakes Rissa Tridactyla At The Only Colony Along Canada's Pacific Coast, Kirk A. Hart, Kenneth G. Wright, Vivian Pattison, J. Mark Hipfner Jul 2025

Successful Breeding By Black-Legged Kittiwakes Rissa Tridactyla At The Only Colony Along Canada's Pacific Coast, Kirk A. Hart, Kenneth G. Wright, Vivian Pattison, J. Mark Hipfner

Marine Ornithology

The Black-legged Kittiwake Rissa tridactyla is a widely distributed and well-studied northern hemisphere seabird. Authoritative publications document the existence of breeding colonies in Canada’s Arctic and Atlantic regions but not in the Pacific region. We visited the small (ca. 50 pairs in recent years) kittiwake breeding colony at Holland Rock, British Columbia, in July and August 2021, and documented what we believe to be the first record of successful breeding at this site. Previous records have documented successful breeding no further south than 58° latitude in Alaska, ~600 km to the north, making Holland Rock the southernmost colony in the …

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Upwelling Links Reproductive Success And Phenology In Tropical Brown Boobies Sula Leucogaster, Ilse Esparza, Kyle H. Elliott, Oris G. Gallardo, Hector M. Guzman Jul 2025

Upwelling Links Reproductive Success And Phenology In Tropical Brown Boobies Sula Leucogaster, Ilse Esparza, Kyle H. Elliott, Oris G. Gallardo, Hector M. Guzman

Marine Ornithology

For organisms living in seasonal environments, timing of breeding is key to ensuring reproductive success. Accordingly, temperate and polar seabird species follow seasonal pulses, matching their breeding events with peaks in ocean productivity. However, the seasonality of breeding has been much less explored in tropical seabirds. Here, we report seasonal variation in oceanography that affects reproductive success of the Brown Booby Sula leucogaster, a species widely distributed in the tropics. We monitored 61 nests during the 2019 breeding season at Bona Island, Gulf of Panama, and collected remote-sensing information for upwelling, sea-surface temperature, rainfall, chlorophyll-α concentration, wind speed, and wind …

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Common Mergansers Mergus Merganser Use Wings To Pursue A Fish Underwater, Anthony B. Lapsansky, Robert H. Armstrong Jul 2025

Common Mergansers Mergus Merganser Use Wings To Pursue A Fish Underwater, Anthony B. Lapsansky, Robert H. Armstrong

Marine Ornithology

Common Mergansers Mergus merganser dive into lakes, rivers, and coastal waters to feed on fish and other aquatic prey. This species and others in the genus Mergus are traditionally classified as foot-propelled divers. When submerged, mergansers are expected to swim by kicking their feet, holding their wings close to their bodies. Here, we report, with video evidence, an event in which four mergansers used their wings underwater to chase down and capture a large fish. Documentation of wing use by this classically defined “foot-propelled diver” illustrates the gaps in our understanding of avian diving physiology, hydrodynamics, and behavior.

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Contents, Pacific Seabird Group Jul 2025

Contents, Pacific Seabird Group

Marine Ornithology

No abstract provided.

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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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Front Cover, Pacific Seabird Group Jul 2025

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: How Birds Evolve: What Science Reveals About Their Origin, Lives And Diversity (Futuyma, Douglas J.); Seabirds: The New Identification Guide (Harrison, P., Perrow, M. & Larsson, H.); The Puffin Plan: Restoring Seabirds To Egg Rock And Beyond (Kress, S.W., Jackson, D.Z.); The Future We Choose: Surviving The Climate Crisis (Figueres, C. & Rivett-Carnac., T.), Anthony J. Gaston, Ian L. Jones, Holly P. Jones, Adalie A. Keltner, Christy N. Wails, George Divoky, Rachel T. Buxton Jul 2025

Reviews: How Birds Evolve: What Science Reveals About Their Origin, Lives And Diversity (Futuyma, Douglas J.); Seabirds: The New Identification Guide (Harrison, P., Perrow, M. & Larsson, H.); The Puffin Plan: Restoring Seabirds To Egg Rock And Beyond (Kress, S.W., Jackson, D.Z.); The Future We Choose: Surviving The Climate Crisis (Figueres, C. & Rivett-Carnac., T.), Anthony J. Gaston, Ian L. Jones, Holly P. Jones, Adalie A. Keltner, Christy N. Wails, George Divoky, Rachel T. Buxton

Marine Ornithology

No abstract provided.

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Salvin's Albatross Thalassarche Salvini Interacting With Freezer Trawlers In Waters Of The Patagonian Shelf, Rubén F. Dellacasa, Leandro N. Chavez, Leandro L. Tamini Jul 2025

Salvin's Albatross Thalassarche Salvini Interacting With Freezer Trawlers In Waters Of The Patagonian Shelf, Rubén F. Dellacasa, Leandro N. Chavez, Leandro L. Tamini

Marine Ornithology

We present a new record of Salvin’s Albatross Thalassarche salvini in waters of the Patagonian continental shelf. During a seabird census on 06 December 2019, a sub-adult individual within a mixed-species flock was observed eating fishery discards. In addition, we review sightings of this species outside its known core range using published records and other information. The species’ presence in Argentine waters has possibly been underestimated and further work to elaborate its interaction with fishery fleets is required.

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Editorial: 50 Volumes Of Marine Ornithology, 1976-2022: The Founding Editor Looks Back, John Cooper Jul 2025

Editorial: 50 Volumes Of Marine Ornithology, 1976-2022: The Founding Editor Looks Back, John Cooper

Marine Ornithology

No abstract provided.

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First Record Of The Red-Footed Booby Sula Sula For Iran, Ali Khani, Faezeh Fatemizadeh Jul 2025

First Record Of The Red-Footed Booby Sula Sula For Iran, Ali Khani, Faezeh Fatemizadeh

Marine Ornithology

The Red-footed Booby Sula sula, a pelagic seabird of the family Sulidae, is widespread in the tropical Atlantic, Indian, and Pacific oceans. Here, we present details and photographs of the first well-documented record of the species for Iran, on the coast of the Persian Gulf, northern Indian Ocean.

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Composition Of The Seabird Community Off French Guiana, Claire Pusineri, Ludivine Martinez, Benjamin De Montgolfier, Dinis Geraldes, Paul Lenrume, Amandine Bordin, Morjane Safi, Alessandra Suardi, Virginie Wyss, Brendan Leclerc, Vincent Rufray Jul 2025

Composition Of The Seabird Community Off French Guiana, Claire Pusineri, Ludivine Martinez, Benjamin De Montgolfier, Dinis Geraldes, Paul Lenrume, Amandine Bordin, Morjane Safi, Alessandra Suardi, Virginie Wyss, Brendan Leclerc, Vincent Rufray

Marine Ornithology

We provide information on the seabirds occurring year-round in waters of the French Guiana Exclusive Economic Zone, based on data obtained from three boat-based campaigns: a campaign by the Groupe d’Étude et de Protection des Oiseaux de Guyane was conducted for four days every two months from July 2011 to June 2012; a campaign by Cohabys was performed for five days per month from January to May 2018; and a campaign by Ocean Science & Logistic consisted of four 10-day surveys conducted in June, July, September, and October 2018. Overall, 30 seabird species within 1110 groups of birds were sighted …

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Movements And Asynchronous Nesting Of The Peruvian Tern Sternula Lorata In Chile And Peru, Thomas P. Ryan, Bárbara Olmedo Barrera, Sylvia Hernández Aquez, Michael T. Hallworth Jul 2025

Movements And Asynchronous Nesting Of The Peruvian Tern Sternula Lorata In Chile And Peru, Thomas P. Ryan, Bárbara Olmedo Barrera, Sylvia Hernández Aquez, Michael T. Hallworth

Marine Ornithology

The Peruvian Tern Sternula lorata is an endangered seabird that nests asynchronously in different parts of its nesting range from northern Chile to Ecuador. Asynchronous nesting raises the possibility of counting individuals more than once during annual population censuses. We deployed 10 light-level archival tags (geolocators) to terns at the nesting ground in Mejillones, Chile, at the southern end of this species’ range during 06–11 September 2015, and we retrieved three the following year at the same location. Results showed that the tagged birds remained at the nesting grounds in Mejillones from July to December then migrated north, some in …

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Seabird Abundance And Distribution Off Western Iberian Waters Estimated Through Aerial Surveys, Hélder Araújo, Pedro Correia-Rodrigues, Jorge Bastos-Santos, Marisa Ferreira, Andreia T. Pereira, Jose Martinez-Cedeira, José Vingada, Catarina Eira Jul 2025

Seabird Abundance And Distribution Off Western Iberian Waters Estimated Through Aerial Surveys, Hélder Araújo, Pedro Correia-Rodrigues, Jorge Bastos-Santos, Marisa Ferreira, Andreia T. Pereira, Jose Martinez-Cedeira, José Vingada, Catarina Eira

Marine Ornithology

Western Iberian waters are important migratory flyways, stopover sites, and wintering areas for several of the world’s seabird species. To describe seabird species composition, distribution, and abundance in these waters, we performed six aerial surveys in September and/ or October of each year, 2010–2015, covering 74 840 km2. Using line-transect methodology, 27 396 seabird sightings from 17 taxonomic groups were recorded along 10496.3 nautical miles (19 433 km). Using the program “Distance,” annual and overall abundance estimates were obtained for nine taxonomic groups: Balearic Shearwater Puffinus mauretanicus, Great Shearwater Ardenna gravis, Cory’s Shearwater Calonectris borealis, shearwaters, Northern Gannet Morus bassanus, …

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The Tropicbirds Phaethon Spp. Of The Islas Desventuradas Archipelago, Chile, Manuel Marín, Rodrigo González Jul 2025

The Tropicbirds Phaethon Spp. Of The Islas Desventuradas Archipelago, Chile, Manuel Marín, Rodrigo González

Marine Ornithology

We found nesting Red-billed and Red-tailed tropicbirds Phaethon aethereus and P. rubricauda in the Islas Desventuradas archipelago, Chile. We visited Islote González on 14–15 December 2020 and on 23 August 2021. During the December visit, we encountered a colony of Red-billed Tropicbirds totaling a minimum of 62 breeding pairs. The nests were in cavities on steep cliffs and slopes located mainly on the northern part of the island, and we were able to access 34, of which 11 had eggs, 11 had nestlings of different ages, and 12 were active but empty. During the August visit, we found four nests …

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Albatross And Petrel Interactions With An Artisanal Squid Fishery In Southern Peru During El Niño, 2015-2017, Cristian Moreno, Javier Quiñones Jul 2025

Albatross And Petrel Interactions With An Artisanal Squid Fishery In Southern Peru During El Niño, 2015-2017, Cristian Moreno, Javier Quiñones

Marine Ornithology

We report on the occurrence of albatrosses (Diomedeidae) and petrels (Procellariidae) associated with an artisanal small-scale fishery (SSF) for Humboldt Squid Dosidicus gigas in waters of southern Peru during El Niño 2015–2016 and coastal El Niño 2017. We deployed as observers on a number of fishing trips to assess seabird interactions. White-chinned Petrels Procellaria aequinoctialis and Waved Albatross Phoebastria irroata were the most abundant species observed, followed by Salvin’s Thalassarche salvini and Chatham T. eremita albatross, and Cape Petrels Daption capense. The majority of procellariid species (> 60% of total birds) visited while vessels were positioned over the continental slope. …

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Infanticide In Highly Urbanized Colonies Of Black Skimmers Rynchops Niger, Elizabeth A. Forys, Sarah K. Beres, Abigail L. Mckay, Olivia N. Spicer Jul 2025

Infanticide In Highly Urbanized Colonies Of Black Skimmers Rynchops Niger, Elizabeth A. Forys, Sarah K. Beres, Abigail L. Mckay, Olivia N. Spicer

Marine Ornithology

Infanticide, which is the killing of dependent offspring, occurs in many species of colonial seabirds. Most infanticide attempts are made when chicks wander outside their parents’ territories and are more likely to occur when the colony experiences a disturbance or food is limited. Our objective was to determine the rate of infanticide at three Black Skimmer Rynchops niger colonies located on highly urbanized beaches in Pinellas County, Florida, USA. Infanticide occurred 42 times during 3 223 hours of monitoring (0.013 attempts per hour) over four breeding seasons (2018–2021). More than one third of the infanticide attempts occurred after a disturbance, …

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Historical Distribution And Current Population Status Of Tufted Puffins Fratercula Cirrhata In Canada's California Current System, Louise K. Blight, Gregory Mcclelland Jul 2025

Historical Distribution And Current Population Status Of Tufted Puffins Fratercula Cirrhata In Canada's California Current System, Louise K. Blight, Gregory Mcclelland

Marine Ornithology

Unpublished accounts indicate that the number of Tufted Puffin Fratercula cirrhata colonies in western Canada has declined in recent decades. However, a lack of recent colony count data makes it impossible to determine current trends. Here we compile published and unpublished information for Tufted Puffins in the Canadian portion of the California Current System (i.e., from the vicinity of the Scott Islands south to the Canada-US border) to update understanding of the species’ status in the region, and to assemble available information in a single source. We found historical records of three additional colonies over those in pre-existing compilations, bringing …

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Direct Field Observation Reveals Whiskered Terns Chlidonias Hybrida Preying On Fish Much Larger Than Themselves, Muhammad Iqbal, Deni Mulyana, Pormansyah, Indra Yustian, Arum Setiawan, Hilda Zulkifli Jul 2025

Direct Field Observation Reveals Whiskered Terns Chlidonias Hybrida Preying On Fish Much Larger Than Themselves, Muhammad Iqbal, Deni Mulyana, Pormansyah, Indra Yustian, Arum Setiawan, Hilda Zulkifli

Marine Ornithology

A Whiskered Tern Chlidonias hybrida, consistent with the species’ aggressive nature, was observed to catch and then consume a Great Blue spotted Mudskipper Boleophthalmus pectinirostris in the Nibung River, Banyuasin Peninsula, South Sumatra Province, Indonesia. The fish was ca. 15 cm in length, which was perhaps equal to the tern’s body length and more than double the size of its usual prey. The tern spent over 20 minutes eating the fish. Only direct, field observation would have revealed predation on this fish.

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Spatial Effects In Relation To Reproductive Performance Of Common Murres Uria Aalge At A Re-Established Colony, Gerard J. Mcchesney, Julie L. Yee, Michael W. Parker, William M. Perry, Harry R. Carter, Richard T. Golightly, Stephen W. Kress Jul 2025

Spatial Effects In Relation To Reproductive Performance Of Common Murres Uria Aalge At A Re-Established Colony, Gerard J. Mcchesney, Julie L. Yee, Michael W. Parker, William M. Perry, Harry R. Carter, Richard T. Golightly, Stephen W. Kress

Marine Ornithology

A main goal of seabird colony restoration is for the colony to become self-sustaining. To do so, elevated rates must be attained in (1) reproductive success and (2) recruitment by immigrants and birds produced at the colony. Thus, an understanding of the factors affecting reproductive success and recruitment at restoration sites is vital. We examined how spatial features at the colony level affected reproductive success of Common Murres Uria aalge (hereafter, murres) over a six-year period at Devil’s Slide Rock, California, a colony re-established using social attraction techniques. Clusters of sites with similar egg-laying dates, as well as high hatching …

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No Evidence Of Avian Malaria In Two Mediterranean Endemic Seabirds, Luca Ilahiane, Federico De Pascalis, Danilo Pisu, David Pala, Federica Ferrario, Marco Cucco, Diego Rubolini, Jacopo G. Cecere, Irene Pellegrino Jul 2025

No Evidence Of Avian Malaria In Two Mediterranean Endemic Seabirds, Luca Ilahiane, Federico De Pascalis, Danilo Pisu, David Pala, Federica Ferrario, Marco Cucco, Diego Rubolini, Jacopo G. Cecere, Irene Pellegrino

Marine Ornithology

In birds, pathogens and diseases—such as avian malaria—can have severe detrimental effects on individual fitness. Pathogen prevalence can vary across species and may differ between populations living in different localities, but screening can aid in our understanding of a disease’s distribution and parasite-host interactions. Although seabirds generally exhibit low avian malaria infection patterns, blood parasites of several species and populations have never been investigated in detail. Using molecular techniques, we screened for blood parasites in two Mediterranean seabirds, the Scopoli’s Shearwater Calonectris diomedea and the Mediterranean Storm Petrel Hydrobates pelagicus melitensis. In addition, we searched for and sampled potential vector …

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A Four-Legged African Penguin Spheniscus Demersus Chick, Albert Snyman, David G. Roberts, Katrin Ludynia Jul 2025

A Four-Legged African Penguin Spheniscus Demersus Chick, Albert Snyman, David G. Roberts, Katrin Ludynia

Marine Ornithology

Here we report an African Penguin Spheniscus demersus chick that was removed from Stony Point, South Africa with two supplementary feet; one supplementary foot was located near the cloaca between the left foot and the tail, and the other supplementary foot was situated just behind the left foot.

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Albatross Population Monitoring Using Satellite Imagery, A Case Study: Short-Tailed Albatross Phoebastria Albatrus At The Senkaku Islands, Nigel Brothers, Catherine Bone, Alexia Wellbelove Jul 2025

Albatross Population Monitoring Using Satellite Imagery, A Case Study: Short-Tailed Albatross Phoebastria Albatrus At The Senkaku Islands, Nigel Brothers, Catherine Bone, Alexia Wellbelove

Marine Ornithology

Accurate monitoring of vulnerable albatross populations is essential to their conservation. Herein, we explore the prospect of monitoring one particular remote albatross population with a view to promoting accurate worldwide monitoring of vulnerable albatross populations. We used very high-resolution (VHR) satellite images to count nesting Short-tailed Albatrosses Phoebastria albatrus on two islands of the Senkaku group, western North Pacific Ocean, where conventional monitoring has not occurred for 19 years due to a geopolitical territory dispute. Despite count uncertainties across rocky terrain, many birds were clearly discernible using the highest resolution image available of Minami-kojima. The result was a count of …

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Winter Colony Attendance By Adult Southern Giant Petrels Macronectes Giganteus: Implications For Rodent Eradications, Peter G. Ryan, Steffen Oppel Jul 2025

Winter Colony Attendance By Adult Southern Giant Petrels Macronectes Giganteus: Implications For Rodent Eradications, Peter G. Ryan, Steffen Oppel

Marine Ornithology

Southern Giant Petrels Macronectes giganteus are partial migrants, but the proportion of adult males and females that visit the colony on Gough Island during winter is poorly defined. A better understanding of winter colony attendance is important to predict the possible impact of non-target mortality during restoration efforts involving poison baiting to eradicate introduced mammals. We repeatedly checked the individual identity of all giant petrels attending the largest breeding colony on Gough Island for rings during April–May 2021. Although the maximum number of individually identifiable ringed adults in a single check was 202, overall, 353 ringed adults were recorded, including …

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