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Underwater Kleptoparasitism On A Human Diver By A Galapagos Flightless Cormorant Nannopterum Harrisi, Juan Manuel Álava-Jurado, Michael J. Kingsford, Margarita Brandt, Eric Dorfman Jul 2025

Underwater Kleptoparasitism On A Human Diver By A Galapagos Flightless Cormorant Nannopterum Harrisi, Juan Manuel Álava-Jurado, Michael J. Kingsford, Margarita Brandt, Eric Dorfman

Marine Ornithology

We describe underwater kleptoparasitism on a human diver by a Galapagos Flightless Cormorant Nannopterum harrisi, a behavior that has not been previously described for this species.


When Ornithology Meets Ethnology And Archeology: The Birds Of The Bird-Cult At Rapa Nui (Easter Island) And Their Demise, Manuel Marín Jul 2025

When Ornithology Meets Ethnology And Archeology: The Birds Of The Bird-Cult At Rapa Nui (Easter Island) And Their Demise, Manuel Marín

Marine Ornithology

The disappearance of the bird species involved in the bird-cult of Rapa Nui (Easter Island) was examined. The cult was a contest in which the winner gathered the first seabird egg of the year from a near-shore islet, allowing the winner to become the Tangata Manu, or Birdman. This title provided a heightened status, bringing social and economic benefits and a way of being closer to their gods. Three seabird species were involved in the bird-cult: Great Frigatebird Fregata minor, Sooty Tern Onychoprion fuscatus, and the Spectacled Tern Onychoprion lunatus, none of which currently breed in the area. Rock art …


European-Asian Population Of Great White Pelican Pelecanus Onocrotalus, From Breeding To Wintering: A Review, Khashayar Mahdiany Bora, Ghazaleh Mirbazel, Mohammadjavad Tajadod Jul 2025

European-Asian Population Of Great White Pelican Pelecanus Onocrotalus, From Breeding To Wintering: A Review, Khashayar Mahdiany Bora, Ghazaleh Mirbazel, Mohammadjavad Tajadod

Marine Ornithology

Great White Pelican Pelecanus onocrotalus (hereafter: GWP) is an IUCN Near Threatened species having two distinct populations. The first population is a migratory European-Asian population that has an extensive Palearctic breeding range from eastern Europe to western Asia and has exhibited a sharp decline during the last couple of decades. The second population, on the other hand, is a sedentary but stable population that breeds mostly in Kenya, South Africa, and Namibia. Herein, we review the literature available on the occurrence patterns of these populations. Many studies on the migratory population show that conditions during winter have substantial impacts on …


The Potential Of Ecologists To Enhance Our Understanding Of Seabird Health, Melanie R. Wells, Annie Philips, Mary-Anne Lea, Scott Carver Jul 2025

The Potential Of Ecologists To Enhance Our Understanding Of Seabird Health, Melanie R. Wells, Annie Philips, Mary-Anne Lea, Scott Carver

Marine Ornithology

Ecologists play a pivotal role in the detection and investigation of population changes in seabirds and by doing so have significant potential to contribute to enhancing knowledge of seabird health. This review highlights key examples in the literature where ecologists have employed diligent passive health surveillance and/or undertaken targeted investigations of seabirds, strategies that have augmented our knowledge of seabird health at individual and population levels. Within the context of One Health, an integrated approach to perceiving and managing health, this review amalgamates veterinarian and ecology disciplines by summarising auxiliary metrics of clinical health that may be considered for incorporation …


Observation Of A Leucistic Brown Noddy Anous Stolidus In Tetiaroa, French Polynesia, Simon Ducatez, Jayna L. Devore Jul 2025

Observation Of A Leucistic Brown Noddy Anous Stolidus In Tetiaroa, French Polynesia, Simon Ducatez, Jayna L. Devore

Marine Ornithology

We observed a leucistic Brown Noddy Anous stolidus on the atoll of Tetiaroa in French Polynesia. This individual was mostly light grey, similar in coloration to a Blue Noddy Anous ceruleus. To the best of our knowledge, this is the first report of a Brown Noddy with such plumage. Brown Noddies and White Terns Gygis alba were particularly aggressive towards the aberrantly colored Brown Noddy.


Laying Sequence And Oceanographic Factors Affect Egg Size In Scripps's Murrelets Synthliboramphus Scrippsi At Santa Barbara Island, Marcela I. Todd Zaragoza, Amelia J. Duvall, Jim A. Howard, David M. Mazurkiewicz, Sarah J. Converse Jul 2025

Laying Sequence And Oceanographic Factors Affect Egg Size In Scripps's Murrelets Synthliboramphus Scrippsi At Santa Barbara Island, Marcela I. Todd Zaragoza, Amelia J. Duvall, Jim A. Howard, David M. Mazurkiewicz, Sarah J. Converse

Marine Ornithology

Egg size is an important avian life history parameter, with larger eggs indicating greater investment of resources in the chick. Prey availability can affect such investment. We investigated the effects of oceanographic conditions and laying sequence on Scripps’s Murrelet Synthliboramphus scrippsi egg size at Santa Barbara Island, California during 2009–2017. We evaluated oceanographic covariates characterizing marine productivity for their effect on egg size, including large-scale oceanographic indices such as the Pacific Decadal Oscillation (PDO) index, Oceanic Niño Index (ONI), and North Pacific Gyre Oscillation (NPGO) index. We also evaluated a larval anchovy catch-per-unit-effort (ANCHL) index and the Biologically Effective Upwelling …


Masthead, Pacific Seabird Group Jul 2025

Masthead, Pacific Seabird Group

Marine Ornithology

No abstract provided.


Inside Front Cover, Pacific Seabird Group Jul 2025

Inside Front Cover, Pacific Seabird Group

Marine Ornithology

No abstract provided.


Author Instructions, Pacific Seabird Group Jul 2025

Author Instructions, Pacific Seabird Group

Marine Ornithology

No abstract provided.


Reviews: Immigrant Gone To Heaven: Dutch Polder To Canada's Frontier (Vermeer, K.); New(Ish) And Interesting Books; The Ocean's Whistleblower: The Remarkable Life And Work Of Daniel Pauly (Gremillet, D.); New Zealand Birds: A Natural History (Wilson, K.-J.), Alan E. Burger, Eric L. Wagner, Laura E. Koehn, Lloyd S. Davis Jul 2025

Reviews: Immigrant Gone To Heaven: Dutch Polder To Canada's Frontier (Vermeer, K.); New(Ish) And Interesting Books; The Ocean's Whistleblower: The Remarkable Life And Work Of Daniel Pauly (Gremillet, D.); New Zealand Birds: A Natural History (Wilson, K.-J.), Alan E. Burger, Eric L. Wagner, Laura E. Koehn, Lloyd S. Davis

Marine Ornithology

No abstract provided.


In Memoriam: William (Bill) R.P. Bourne, 1930-2021, Pat Baird Jul 2025

In Memoriam: William (Bill) R.P. Bourne, 1930-2021, Pat Baird

Marine Ornithology

This tribute is a compilation of obituaries by Michael Harris and Mark Tasker, Craig Harrison's speech at the ceremony for Bill's Pacific Seabird Group (PSG) Lifetime Achievement Award in 1997, Michael Harris's eulogy at Bill's memorial service in Scotland, and emails I have received from PSG members, as well as from my memories of a very long friendship with Bill and his wife Sheila spanning over 30 years.


Migrational Movements And Seasonal Home Ranges Of Greater Crested Terns Thalasseus Bergii Breeding In The South China Sea, Xin Yu, Xiao Guo, Yanzhu Ji, Shiyu Tang, Chenxi Jia, Fumin Lei Jul 2025

Migrational Movements And Seasonal Home Ranges Of Greater Crested Terns Thalasseus Bergii Breeding In The South China Sea, Xin Yu, Xiao Guo, Yanzhu Ji, Shiyu Tang, Chenxi Jia, Fumin Lei

Marine Ornithology

The migratory pathways of Greater Crested Terns Thalasseus bergii in the East Asian-Australasian Flyway are poorly known. We tracked three birds by deploying GPS/GSM transmitters in September 2018, one for 23 months, one for 16 months, and one for 1.5 months. These tracks included complete fall migration routes for all three individuals and partial spring migration routes for two individuals between a breeding area in the Xisha Archipelago (South China Sea) and two wintering areas, one in the western Philippine Archipelago and the other in the western Celebes Sea. We observed that the two fully tracked terns had large seasonal …


Melanism In A Common Murre Uria Aalge In Kachemak Bay, Alaska, Sarah K. Schoen, Mayumi L. Arimitsu, Caitlin E. Marsteller, Brielle M. Heflin Jul 2025

Melanism In A Common Murre Uria Aalge In Kachemak Bay, Alaska, Sarah K. Schoen, Mayumi L. Arimitsu, Caitlin E. Marsteller, Brielle M. Heflin

Marine Ornithology

In accord with melanism being uncommon in birds, we could find only six published records of completely melanistic Common Murres Uria aalge, one of the most widely and intensively studied of all seabirds. We added to the record by observing a Common Murre in completely dark, melanistic alternate plumage every summer from 2017 to 2021 at Gull Island in Kachemak Bay, Alaska, USA. In 2017, the bird frequented the colony periphery, indicating that it could have been a subadult. Subsequently, it occupied the same narrow rock ledge within the colony every summer from 2018 to 2021, an indication that it …


The Influence Of Breeding Status And Nest Site Location On Marine Habitat Use By Marbled Murrelet Brachyramphus Marmoratus, Sonya A. Pastran, David B. Lank, Patrick D. O’Hara, Russell W. Bradley, Cecilia Lougheed, Lynn W. Lougheed, Nadine R. Parker, Laura A. Mcfarlane Tranquilla, Elizabeth A. Krebs, Fred Cooke, Douglas F. Bertram Jul 2025

The Influence Of Breeding Status And Nest Site Location On Marine Habitat Use By Marbled Murrelet Brachyramphus Marmoratus, Sonya A. Pastran, David B. Lank, Patrick D. O’Hara, Russell W. Bradley, Cecilia Lougheed, Lynn W. Lougheed, Nadine R. Parker, Laura A. Mcfarlane Tranquilla, Elizabeth A. Krebs, Fred Cooke, Douglas F. Bertram

Marine Ornithology

The Marbled Murrelet Brachyramphus marmoratus is a threatened seabird that relies on old-growth forest for nesting. We compare marine space use between breeding and non-breeding birds, and how marine home range locations and overlap vary with respect to nesting location and breeding status. We collected very high frequency (VHF) radio-telemetry data in southern British Columbia from Clayoquot Sound (190 birds; 2000–2002) and Desolation Sound (206 birds; 1998–2001). The sites differ strongly in their oceanic exposure and surrounding terrestrial features. Kernel utilization distribution-based estimates showed that breeders and non-breeders had similar overall distributions, but breeders were more spatially aggregated. Pooled home …


Breeding Parameters Of Yellow-Legged Gull Larus Michahellis In The Largest Moroccan Colony: Natural Versus Urban Nesting Sites, Siham Bellout, Moulay Abdeljalil Ait Baamrane, Mohamed Aourir Jul 2025

Breeding Parameters Of Yellow-Legged Gull Larus Michahellis In The Largest Moroccan Colony: Natural Versus Urban Nesting Sites, Siham Bellout, Moulay Abdeljalil Ait Baamrane, Mohamed Aourir

Marine Ornithology

We investigated the main differences in the breeding ecology of Yellow-legged Gulls Larus michahellis nesting in urban (city of Essaouira) and natural (Mogador Island) environments on the African Atlantic coast of west-central Morocco during the 2018 and 2019 breeding seasons. This Yellow-legged Gull population is the largest in the southern portion of this species’ range, making it excellent for research on the breeding biology of marginal populations. Over two years, we collected data on nest density, chronology, clutch size, egg dimensions, and hatching success from nests across the city and island. Results showed that nest density averaged 1.26 ± 1.03 …


First Record Of A Common Diving Petrel Pelecanoides Urinatrix From Continental Africa, And A Summary Of Diving Petrel Distribution In The Southern Ocean, Peter G. Ryan, Vincent L. Ward, Susan M. Miller Jul 2025

First Record Of A Common Diving Petrel Pelecanoides Urinatrix From Continental Africa, And A Summary Of Diving Petrel Distribution In The Southern Ocean, Peter G. Ryan, Vincent L. Ward, Susan M. Miller

Marine Ornithology

Tracking studies show that diving petrels regularly disperse thousands of kilometres from their colonies during the non-breeding season, yet there are relatively few vagrant records of diving petrels. We report the first record of a diving petrel from continental Africa. A Common Diving Petrel Pelecanoides urinatrix was found dead near Cape Town, South Africa, on 03 March 2021. It appeared to be from the sub Antarctic subspecies P. u. exsul, which is supported by sightings at sea; P. u. dacunhae is not recorded away from Tristan da Cunha and Gough Islands. However, diving petrels are common ~1500–2 000 km southwest …


At-Colony Behaviour Of Great Black-Backed Gulls Larus Marinus Following Breeding Failure, Laurie D. Maynard, Julia Gulka, Edward Jenkins, Gail K. Davoren Jul 2025

At-Colony Behaviour Of Great Black-Backed Gulls Larus Marinus Following Breeding Failure, Laurie D. Maynard, Julia Gulka, Edward Jenkins, Gail K. Davoren

Marine Ornithology

Territoriality for breeding sites comes at an energetic cost—individuals actively defend the site from competitors and potential predators, thus precluding themselves from self-maintenance (e.g., foraging, preening) or offspring care. Breeding individuals are also constrained to central place foraging within a limited range of the territory. For these reasons, many seabirds do not spend extensive periods or make regular visits to the colony following breeding failure. To investigate behaviour following breeding failure, we studied colony and nest attendance and daily number of visits for six Great Black-backed Gulls Larus marinus that had failed to breed following global positioning system (GPS) tag …


Identification Of Marine Important Conservation Areas For Mediterranean Storm Petrels Hydrobates Pelagicus Melitensis Breeding In Sardinia, Italy, Federico De Pascalis, Danilo Pisu, David Pala, Andrea Benvenuti, Francesca Visalli, Eugenio Carlon, Lorenzo Serra, Diego Rubolini, Jacopo G. Cecere Jul 2025

Identification Of Marine Important Conservation Areas For Mediterranean Storm Petrels Hydrobates Pelagicus Melitensis Breeding In Sardinia, Italy, Federico De Pascalis, Danilo Pisu, David Pala, Andrea Benvenuti, Francesca Visalli, Eugenio Carlon, Lorenzo Serra, Diego Rubolini, Jacopo G. Cecere

Marine Ornithology

Marine predators are an important component of marine trophic webs, and their decline has important consequences on whole ecosystem dynamics. Understanding their movements and habits is vital for conservation, yet extremely challenging. Tracking technologies, coupled with a robust, reproducible, and quantitative analytical framework, are being used to successfully identify Important Conservation Areas (ICAs) for seabirds, which are wide-ranging and declining marine predators. However, the identification of such areas is skewed towards large-bodied seabird species, and there are few marine ICAs for small-bodied birds like storm petrels. We GPS-tracked Mediterranean Storm Petrels Hydrobates pelagicus melitensis breeding in northwestern Sardinia over three …


Nesting Distribution Of Masked Booby Sula Dactylatra At Trindade Island, Western South Atlantic Ocean, Victória R.F. Benemann, Leonardo D. Araújo, Arthur Z. Fabbris, Rosalinda C. Montone, Maria V. Petry Jul 2025

Nesting Distribution Of Masked Booby Sula Dactylatra At Trindade Island, Western South Atlantic Ocean, Victória R.F. Benemann, Leonardo D. Araújo, Arthur Z. Fabbris, Rosalinda C. Montone, Maria V. Petry

Marine Ornithology

The Masked Booby Sula dactylatra is a surface-nesting seabird that breeds on offshore islands across the tropical and subtropical oceans. On inaccessible rocky areas on Trindade Island, located about 1200 km from Espírito Santo, Brazil, the nesting of this species has been poorly studied. To model the species’ nesting habitat suitability at Trindade Island, we mapped active nests during the breeding seasons of 2017 and 2019, from October to November, using a hand-held Global Positioning System receiver and an Unmanned Aerial Vehicle. In order to identify key areas, we created nesting habitat suitability maps using seven different algorithms (Random Forest, …


Foraging Ecology Of Red-Billed Tropicbird Phaethon Aethereus In The Caribbean During Early Chick Rearing Revealed By Gps Tracking, Hannah Madden, Yvan Satgé, Bradley Wilkinson, Patrick G.R. Jodice Jul 2025

Foraging Ecology Of Red-Billed Tropicbird Phaethon Aethereus In The Caribbean During Early Chick Rearing Revealed By Gps Tracking, Hannah Madden, Yvan Satgé, Bradley Wilkinson, Patrick G.R. Jodice

Marine Ornithology

Investigating the foraging patterns of tropical seabirds can provide important information about their ocean habitat affinities as well as prey choice. Foraging studies of Red-billed Tropicbird Phaethon aethereus populations in the Caribbean are lacking. We sought to rectify this by opportunistically sampling regurgitates at nest sites on the island of St. Eustatius, Lesser Antilles, and by linking the GPS tracks of foraging adults to remotely sensed environmental variables. Diet samples were dominated by Exocoetidae (59.5%) and Belonidae (14.9%), although we were unable to identify 25.5% of samples due to digestion. Tropicbirds nesting on St. Eustatius exhibited diurnal foraging patterns, foraged …


Digging In! Burrowing Penguins And Surface Predators, Laura X.L. Tan, Kasun B. Ekanayake, Wouter F.D. Van Dongen, Peter Dann, Duncan R. Sutherland, Michael A. Weston Jul 2025

Digging In! Burrowing Penguins And Surface Predators, Laura X.L. Tan, Kasun B. Ekanayake, Wouter F.D. Van Dongen, Peter Dann, Duncan R. Sutherland, Michael A. Weston

Marine Ornithology

A native Australian corvid, Little Raven Corvus mellori, has emerged as a dominant and problematic predator of an ecologically and economically important seabird, the Little Penguin Eudyptula minor. In 2013, ravens successfully preyed upon clutches/broods of the burrow-nesting penguin, especially those in shallower, more accessible burrows. Individual raven size might mediate which ravens attack penguins; smaller ravens may be able to enter burrows more easily; alternatively, larger ravens may be more capable of overcoming penguin parental defence. Here, we consider the predator-prey interactions to assess whether associations with burrow characteristics persisted and examine whether raven size mediated propensity to prey …


Nocturnal Flight Activity By Northern Gannets Morus Bassanus In Response To Predator Presence, Kyle J.N. D’Entremont, William A. Montevecchi Jul 2025

Nocturnal Flight Activity By Northern Gannets Morus Bassanus In Response To Predator Presence, Kyle J.N. D’Entremont, William A. Montevecchi

Marine Ornithology

The Northern Gannet Morus bassanus typically flies only during the day, with minimal flight activity following civil twilight. Here we document nocturnal flight activity by Northern Gannets in response to predation risk by Eastern Coyotes Canis latrans. Eight parental gannets were fitted with GPS/time-depth recorders on 15 July 2021 at mainland nest sites at Cape St. Mary’s, Newfoundland, Canada. Previously, among 506 foraging trips in 2019 and 2020 that were investigated using biologging, only two were initiated at night, suggesting nocturnal departures for foraging are very rare at this colony. Then, however, killings of chicks by coyotes occurred within our …


Spotted Again After 29 Years: Spot-Billed Pelican Pelecanus Philippensis In Indonesia, Hasri Abdillah, Muhammad Iqbal, Seno Pramudita, Alfianto Luat Siregar, Arief Hidayat, Muhammad Hatta, Anggi Elmolincont Tampubolon Jul 2025

Spotted Again After 29 Years: Spot-Billed Pelican Pelecanus Philippensis In Indonesia, Hasri Abdillah, Muhammad Iqbal, Seno Pramudita, Alfianto Luat Siregar, Arief Hidayat, Muhammad Hatta, Anggi Elmolincont Tampubolon

Marine Ornithology

We report an observation of a Spot-billed Pelican Pelecanus philippensis on 07 October 2021 in North Sumatra Province, Indonesia. This is the first sight-record of the species in Indonesia since 1992.


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 …


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.


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, …


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.


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 …


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 …


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 …