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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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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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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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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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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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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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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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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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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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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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Sabine's Gulls Xema Sabini Outside Of Their Main Wintering Areas Are Not Necessarily Vagrants, Jonatas H.F. Prado, Gabriel Canani, Pedro V. Castilho, Nicholas W. Daudt Jul 2025

Sabine's Gulls Xema Sabini Outside Of Their Main Wintering Areas Are Not Necessarily Vagrants, Jonatas H.F. Prado, Gabriel Canani, Pedro V. Castilho, Nicholas W. Daudt

Marine Ornithology

We reviewed published and unpublished ‘vagrant’ (herein referred to as ‘unusual’) records of Sabine’s Gull Xema sabini worldwide and discuss these records according to age, marine productivity/fishing grounds, and migration corridors. Of the 151 unusual records, 135 (89%) were in or near areas with high productivity and/or known fishing grounds; 10 out of 14 documented records were young birds in their first or second migration, and the ‘unusual’ areas identified in this study could have been reached through known migration pathways used by other bird species. The fact that the majority of records are associated with productive/fishing zones (and are …

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Diagnosis Of Hypothermia In Seabirds From Coastal California, Nancy L. Anderson Jul 2025

Diagnosis Of Hypothermia In Seabirds From Coastal California, Nancy L. Anderson

Marine Ornithology

This study established cloacal temperature (TCl) cut-off values to diagnose hypothermia in near shore seabirds rescued along the coast of California. All birds died when TCl was < 38.2 °C. When Aechmophorus grebes were excluded, 100% died when TCl was < 38.4 °C. Mortality increased 2–3× when TCl was lower than receiver operating curve-determined criteria for diagnosing hypothermia based on attitude: < 38.8 °C for mixed species, < 39.1 °C for Common Murres Uria aalge, and < 38.2 °C for Aechmophorus grebes. Reductions in TCl as small as 1.0 °C had significant physiologic effects.

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Trace Elements In Feathers And Eggshells Of Two Tropical Seabirds From Malaysia, Abdulmaula Hamza, Alya Syakirin Hisham, Suhaimi Suratman, Joseph Anak Bidai, Noor Azhar Bin Mohamed Shazili Jul 2025

Trace Elements In Feathers And Eggshells Of Two Tropical Seabirds From Malaysia, Abdulmaula Hamza, Alya Syakirin Hisham, Suhaimi Suratman, Joseph Anak Bidai, Noor Azhar Bin Mohamed Shazili

Marine Ornithology

Seabird feathers and eggshells are used as bio-monitors for trace metal contamination. Eleven trace element concentrations in wing primaries (n = 21) and eggshells (n = 8) are reported herein for two resident seabirds, Bridled Tern Onychoprion anaethetus and Black-naped Tern Sterna sumatrana, at Pulau Ling and Pulau Tokung Burung, Malaysia. Metal concentration followed the pattern Zn > Cr > Mn > Sr > Cu > Se > Ba > Pb > Cd > Ga > Li. Significant positive correlations existed among all trace metals, except for Cr in Black-naped Tern and Li and Cd in Bridled Tern feathers. We also analyzed metal concentrations in eggshells, and for Bridled Tern …

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Mercury Contamination In The Endocrine Glands Of Black-Tailed Gulls Larus Crassirostris On Kabushima (Kabu Island), Japan, Yasuaki Niizuma, Hinako Tani, Yuki Yamashita, Mitsuki Ito, Miho Maeda Jul 2025

Mercury Contamination In The Endocrine Glands Of Black-Tailed Gulls Larus Crassirostris On Kabushima (Kabu Island), Japan, Yasuaki Niizuma, Hinako Tani, Yuki Yamashita, Mitsuki Ito, Miho Maeda

Marine Ornithology

A colony of about 30 000 pairs of Black-tailed Gull Larus crassirostris nest on Kabushima (Kabu Island), which is located on the northeast mainland coast of Japan (Sanriku Coast, Honshu Island). There, the surface-water Hg concentration is higher than in the North Pacific Ocean. We collected carcasses from the breeding colony to assess the level of mercury (Hg) contamination. We measured Hg concentrations in 10 body tissues, including the endocrine glands. The relative mercury concentrations in the tissue samples (µg/g dry weight) were as follows: adrenal glands > livers > kidneys > blood > pituitaries > gonads > breast muscles > thyroid glands > pancreases > brain stems. Correlations …

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Fishing Gear-Related Injuries And Mortality Of Seabirds In Coastal Northern Argentina, María Paula Berón, Juan Pablo Seco Pon Jul 2025

Fishing Gear-Related Injuries And Mortality Of Seabirds In Coastal Northern Argentina, María Paula Berón, Juan Pablo Seco Pon

Marine Ornithology

Worldwide, many seabirds are killed annually when they become entangled in gear used in coastal fisheries. This includes seabirds along the coast of Argentina, where recreational fishing occurs year-round and where little attention has been paid to the issue. We report here results for a study conducted in the vicinity of Mar del Plata Harbor and Mar Chiquita Lagoon in Buenos Aires Province, Argentina, during the non-breeding season (March–September 2016). We found and inspected 46 individuals of ten species with moderate (30%), severe (46%), and lethal (24%) lesions from fishing gear entanglement. Coastal birds (83%) dominated the tally, with gulls …

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