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Articles 1561 - 1590 of 163042

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A Common Tern Sterna Hirundo Capturing An Airborne Flying Squid: A Novel Foraging Technique?, Angelico Jose C. Tiongson Jul 2025

A Common Tern Sterna Hirundo Capturing An Airborne Flying Squid: A Novel Foraging Technique?, Angelico Jose C. Tiongson

Marine Ornithology

Seabirds forage in the air-water interface and have adapted various feeding techniques to exploit resources at or beneath the surface. Here I present photographic evidence of a novel feeding technique by an Eastern Common Tern Sterna hirundo longipennis: the capture of an airborne flying squid. Terns are generally plunge-divers for fish or shrimp, but they are also known to feed extensively on insects and occasionally by kleptoparasitism. Aerial pursuit/capture may be more common among seabirds in areas where flying prey are abundant. This new observation highlights the opportunistic nature and flexibility of seabirds in obtaining prey, as well as the …

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No Evidence Of Habitat Effect On Clutch Size, Egg Quality, And Hatching Success Of The Yellow-Legged Gull Larus Michahellis At A Micro-Spatial Scale, Sergio Delgado, Nere Zorrozua, Juan Arizaga Jul 2025

No Evidence Of Habitat Effect On Clutch Size, Egg Quality, And Hatching Success Of The Yellow-Legged Gull Larus Michahellis At A Micro-Spatial Scale, Sergio Delgado, Nere Zorrozua, Juan Arizaga

Marine Ornithology

In colonial seabirds, the nest substrate that is available and, in particular, the vegetation cover around the nest, are important environmental factors that drive an individual’s nesting selection process and, ultimately, reproductive performance. Using data collected during three consecutive years in a Yellow-legged Gull Larus michahellis colony from the Bay of Biscay, Spain, we tested whether clutch size, egg volume, and hatching success covaried with the proportion of vegetation cover around nests. We found no effect of vegetation cover on breeding performance. Laying date showed a positive effect on egg volume and a negative effect on hatching success and the …

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Birds Depredating Stingrays And Skates (Chondrichthyes: Batoidea): New Observations And A Review Of Records, James A. Fitzsimons Jul 2025

Birds Depredating Stingrays And Skates (Chondrichthyes: Batoidea): New Observations And A Review Of Records, James A. Fitzsimons

Marine Ornithology

Gulls (Larus spp.) have a diet that includes fish, but they are also often dietary generalists. A limited number of dietary studies have been undertaken on the Pacific Gull Larus pacificus, which are endemic to Australia. Here, an observation of depredation by a Pacific Gull on a Southern Fiddler Ray Trygonorrhina dumerilii is described. Prior to this observation, rays and skates had not been recorded in the diet of Pacific Gulls, and there are few records in the literature of depredation by gulls (Laridae) or other bird families on species of cartilaginous fishes from the superorder Batoidea. However, there is …

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Hatching Success Of Common Murres Uria Aalge Is Linked To The Number Of Neighbours And Resource Availability, Amy L. Irvine, Julia E. Gulka, Gail K. Davoren Jul 2025

Hatching Success Of Common Murres Uria Aalge Is Linked To The Number Of Neighbours And Resource Availability, Amy L. Irvine, Julia E. Gulka, Gail K. Davoren

Marine Ornithology

When breeding within densely populated colonies, seabirds benefit from increased offspring protection from predators, but intraspecific competition for resources may outweigh these benefits. We tested whether the number of breeding-site neighbours and days of predator presence influenced the breeding performance of Common Murres Uria aalge at two different-sized colonies off the northeastern Newfoundland coast: Cabot Island (10000 breeding pairs; < 10 km offshore) and Funk Island (500000 breeding pairs; ~60 km offshore). Gulls, the main predators of murre eggs/chicks, inhabit both islands in similar numbers. During July–August 2018, camera traps placed at topographically similar plots on each colony recorded breeding performance metrics (i.e., hatching, fledging, reproductive success), number of breeding-site neighbours, and daily presence of gulls. Hatching success was lower at Funk Island (64.7%) than Cabot Island (96.2%), but nearly all hatched chicks fledged at both colonies. Lower hatching success at Funk Island was due to higher egg abandonment and predation. It was also associated with fewer breeding-site neighbours, including non-brooding mates and non-breeders, along with higher gull presence (96.6% of all gull sightings at both colonies). Fewer neighbours at Funk Island may have resulted from mates and non-breeding murres spending more time at sea due to longer distances to predictable foraging sites and higher conspecific densities relative to Cabot Island. In turn, with fewer breeding-site neighbours at Funk Island, parents appeared less able to defend against or deter gull predation. Although Funk Island has special conservation status, protection of Cabot Island may also be important for the long-term conservation of murres in Newfoundland.

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Status And Monitoring Methods Of A Red-Tailed Tropicbird Colony On O'Ahu, Hawai'i, Eric A. Vanderwerf Jul 2025

Status And Monitoring Methods Of A Red-Tailed Tropicbird Colony On O'Ahu, Hawai'i, Eric A. Vanderwerf

Marine Ornithology

The Red-tailed Tropicbird Phaethon rubricauda is a widespread seabird that nests in the tropical Pacific and Indian oceans. Most the global population nests in the predator-free Northwestern Hawaiian Islands. In the southeastern Hawaiian Islands, non-native predators restrict the species to nesting on coastal cliffs and small islets. I monitored 734 Red-tailed Tropicbird nests near Ha¯lona Point on O‘ahu during 2005–2020, controlled non-native predators to protect nests (beginning in 2006), and developed tools to facilitate monitoring of the species in other areas. The colony increased in size in response to predator control, from 18 eggs laid in 2006 to 94 eggs …

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Abnormal Plumage Colouration In Spot-Billed Pelicans Pelecanus Philippensis At Pulicat Lake, Andhra Pradesh, India, Vaithianathan Kannan Jul 2025

Abnormal Plumage Colouration In Spot-Billed Pelicans Pelecanus Philippensis At Pulicat Lake, Andhra Pradesh, India, Vaithianathan Kannan

Marine Ornithology

Plumage colour variation is rarely observed in the Pelecaniformes and had not been previously recorded for the Spot-billed Pelican Pelecanus philippensis. Observed at Pulicat Lake, Andhra Pradesh, India, I describe strikingly coloured Spot-billed Pelicans having dark brown plumage, pink coloration on the bill, and black feet, but having normal eye colour

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Reproductive Ecology Of The Black-Necked Swan Cygnus Melancoryphus In A Marine Wetland Of Southern Chile, Jaime A. Cursach, Jaime R. Rau, Claudio N. Tobar, Jonnathan Vilugrón, Francisco Brañas Jul 2025

Reproductive Ecology Of The Black-Necked Swan Cygnus Melancoryphus In A Marine Wetland Of Southern Chile, Jaime A. Cursach, Jaime R. Rau, Claudio N. Tobar, Jonnathan Vilugrón, Francisco Brañas

Marine Ornithology

The Black-necked Swan Cygnus melancoryphus is an endangered species in Chile. After the Río Cruces ecological disaster in Valdivia in 2004 (due to installation of a new pulp mill), the Black-necked Swans that survived were mostly dispersed to marine wetlands of the large island of Chiloé, passing from continental wetlands to the marine environment. The objectives of this study were to provide the first observations of nesting Black-necked Swans in the marine wetland of Chiloé Island, and to identify factors that may affect the survival of their cygnets. Our study was carried out in Caulín Bay (41°49ʹS; 073°38ʹW), Chiloé Island, …

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Distribution Patterns And Population Size Of The Ashy Storm Petrel Oceanodroma Homochroa, R. Glenn Ford, Scott Terrill, Janet Casey, Debi Shearwater, Stephanie R. Schneider, Lisa T. Balance, Linda Terrill, Margot Tollefson, David G. Ainley Jul 2025

Distribution Patterns And Population Size Of The Ashy Storm Petrel Oceanodroma Homochroa, R. Glenn Ford, Scott Terrill, Janet Casey, Debi Shearwater, Stephanie R. Schneider, Lisa T. Balance, Linda Terrill, Margot Tollefson, David G. Ainley

Marine Ornithology

The Ashy Storm Petrel (ASSP) Oceanodroma homochroa population has been surveyed intensively, both at sea within the California Current and on the adjacent breeding grounds. Nevertheless, colony-based estimates of breeding populations have significantly underestimated the species’ abundance, especially in the northern portion of its range compared to the southern portion. The species has been described as abundant in central-northern waters, whereas it is considered rare or uncommon in the southern portion. We analyzed aerial and ship tracks from 1980 to 2017 (~497000 km covering 91267 km2 ), to estimate total ASSP population size and at-sea distribution. Modeling the results of …

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Unusual Mass Stranding Event Of White-Chinned Petrels Procellaria Aequinoctialis In Santa Catarina State, Southern Brazil, Cristiane K. M. Kolesnikovas, Emanuel C. Ferreira, Cristiana C. A. Assumpção, Patrícia P. Serafini Jul 2025

Unusual Mass Stranding Event Of White-Chinned Petrels Procellaria Aequinoctialis In Santa Catarina State, Southern Brazil, Cristiane K. M. Kolesnikovas, Emanuel C. Ferreira, Cristiana C. A. Assumpção, Patrícia P. Serafini

Marine Ornithology

Bycatch is a significant threat for albatrosses and petrels in general but especially within Brazilian waters. As part of a monitoring program, Projeto de Monitoramento de Praias da Bacia de Santos (PMP-BS), an unusually high number of White-chinned Petrels Procellaria aequinoctialis was recorded at Santa Catarina Island: 72 birds from August 2015 to July 2016 (60 dead and 12 alive) and 31 birds from 29 December 2015 to 05 January 2016 (28 dead and 3 alive). Evaluation of the carcasses showed that 12 birds had external evidence of anthropogenic interaction, and necropsy demonstrated that at least two had perforation of …

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A New Breeding Colony Of Blue-Footed Booby Sula Nebouxii At Islote González, Archipelago Islas Desventuradas, Chile, Manuel Marín, Rodrigo González Jul 2025

A New Breeding Colony Of Blue-Footed Booby Sula Nebouxii At Islote González, Archipelago Islas Desventuradas, Chile, Manuel Marín, Rodrigo González

Marine Ornithology

We describe a new disjunct population of Blue-footed Booby Sula nebouxii at Islote González in the Islas Desventuradas archipelago. Though likely much larger, the population size at the time of our survey was a minimum of 16 breeding pairs. On 14–15 December 2020, two pairs of boobies with nestlings and four pairs with empty nests were found. Likely the species is a recent arrival to the archipelago, perhaps during one of the strong El Niño events between 1970 and 2001 (especially 1982/83, when the species was first recorded in Chile). Blue-footed Booby might also nest on different areas at San …

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Kidney Lesions Related To Trematode Infestation In A Cabot's Ternâ Thalasseus Acuflavidus Found In Brazil, Rafaela N.R. Cardoso, Hassan Jerdy, Paula Baldassin, Eulógio C.Q. Carvalho, Max R. Werneck Jul 2025

Kidney Lesions Related To Trematode Infestation In A Cabot's Ternâ Thalasseus Acuflavidus Found In Brazil, Rafaela N.R. Cardoso, Hassan Jerdy, Paula Baldassin, Eulógio C.Q. Carvalho, Max R. Werneck

Marine Ornithology

We describe the occurrence of the trematode Renicola sp. associated with kidney lesions in a Cabot’s Tern Thalasseus acuflavidus from Brazil. During necropsy, we observed renal paleness, subpleural hemorrhage at the edges of the organ, and severe dilation of both ureters. Histological analysis revealed distension of the branches of the ureters, with partial obstruction due to the presence of the parasites and compression of adjacent tubules. The infection did not likely cause the tern's death.

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Masthead, Pacific Seabird Group Jul 2025

Masthead, Pacific Seabird Group

Marine Ornithology

No abstract provided.

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Contents, Pacific Seabird Group Jul 2025

Contents, 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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Inside Front Cover, Pacific Seabird Group Jul 2025

Inside Front Cover, Pacific Seabird Group

Marine Ornithology

No abstract provided.

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Reviews: The Art Of The Bird: The History Of Ornithological Art Through Forty Artists (Lederer, R.J.); Vanishing Fish: Shifting Baselines And The Future Of Global Fisheries (Pauly, D.); Ta Life On Our Planet: My Witness Statement And A Vision For The Future (Attenborough, D.), Abby Mcbride, Michelle Paleczny, Phillip Taylor Jul 2025

Reviews: The Art Of The Bird: The History Of Ornithological Art Through Forty Artists (Lederer, R.J.); Vanishing Fish: Shifting Baselines And The Future Of Global Fisheries (Pauly, D.); Ta Life On Our Planet: My Witness Statement And A Vision For The Future (Attenborough, D.), Abby Mcbride, Michelle Paleczny, Phillip Taylor

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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Longevity Records For The Brown Booby Sula Leucogaster And Flesh-Footed Shearwater Ardenna Carneipes, Vincent H.S. Yap, Lillian G. Stewart, Silke Stuckenbrock, Andrew L. Fidler, Jennifer L. Lavers Jul 2025

Longevity Records For The Brown Booby Sula Leucogaster And Flesh-Footed Shearwater Ardenna Carneipes, Vincent H.S. Yap, Lillian G. Stewart, Silke Stuckenbrock, Andrew L. Fidler, Jennifer L. Lavers

Marine Ornithology

Longevity records for seabirds are vital to understanding population demography but are often limited due to the relatively short duration of many monitoring programs. Here, we present new longevity records for two seabird species: 32.2 years (Queensland, Australia) for the Brown Booby Sula leucogaster and 33.9 years (New Zealand) for the Flesh-footed Shearwater Ardenna carneipes, alongside existing longevity data. While these new records represent the oldest known birds to date, we suggest that they reflect typical adult lifespans of these species, i.e., 25–30 years, and reinforce the need for ongoing monitoring efforts.

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Studies Of The Time Budget And Daily Activity Of Common Eider Somateria Mollissima During Incubation, Grigori M. Tertitski, Evgeny V. Semashko, Alexander E. Cherenkov, Vladimir Y. Semashko Jul 2025

Studies Of The Time Budget And Daily Activity Of Common Eider Somateria Mollissima During Incubation, Grigori M. Tertitski, Evgeny V. Semashko, Alexander E. Cherenkov, Vladimir Y. Semashko

Marine Ornithology

In the Common Eider Somateria mollissima, only females incubate the clutch over a period of 25–28 days. Determining their schedule of nest absence, how long they are away, how often, and where they go can be problematic. They must also avoid nest predation while tending to their own needs. We used geolocators to investigate the behavior of incubating females on forested islands in Dolgaya Guba Bay (65°03′N, 035°47′E), White Sea, Russia. Data were obtained for 12 females: three in 2015 and 2016, four in 2017, and two in 2018. During the entire incubation period, females left their nests for the …

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Fishy Tales: Behaviour Of Schooling Fish Escaping From Terns, Kees Hulsman, Gurudeo Anand Tularam Jul 2025

Fishy Tales: Behaviour Of Schooling Fish Escaping From Terns, Kees Hulsman, Gurudeo Anand Tularam

Marine Ornithology

The aim of this study is to develop a better understanding of seabird foraging behaviour and the anti-predator behaviour of their prey. Studies of seabirds’ foraging and prey-capture behaviour, as it relates to the evasive and escape behaviour of schooling fish, are sparse. Our study was carried out at One Tree Reef on the southern end of the Great Barrier Reef, Australia. A school of hardyheads Pranesus capricornensis sheltered in the shallows over the sand flats in front of the research station for 14 non-consecutive days. In that time, Lesser Crested Terns Thalasseus bengalensis were observed for 10 hours from …

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Southern Influx Of The Pantropical Bulwer's Petrel Bulweria Bulwerii Into The Tasman Sea, Simon B. Z. Gorta Jul 2025

Southern Influx Of The Pantropical Bulwer's Petrel Bulweria Bulwerii Into The Tasman Sea, Simon B. Z. Gorta

Marine Ornithology

Seabirds exploit marine habitats for resources, responding to many complex environmental signals that ultimately drive their distributions. Occasionally, influxes of seabird species to regions outside their normal range occur and determining the drivers of these patterns can aid in understanding their ecology and their conservation. I documented five birdwatching observations of Bulwer’s Petrel Bulweria bulwerii in the Tasman Sea between 24 January and 08 March 2020, roughly 2000 km south of their core range. Based on demographic, environmental, and anecdotal observations of seabirds, cetaceans, and bait fish, I suggest that the influx was most likely resource-driven, rather than accidental, age-related, …

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Morphometric Sex Determination Of Breeding Adult Royal Thalasseus Maximus And Sandwich Terns T. Sandvicensis In Louisiana, Megan Nepshinsky, Sabrina S. Taylor, Jeff S. Liechty, Ashlee K. Minor, Eva D. Windhoffer, Aaron R. Pierce Jul 2025

Morphometric Sex Determination Of Breeding Adult Royal Thalasseus Maximus And Sandwich Terns T. Sandvicensis In Louisiana, Megan Nepshinsky, Sabrina S. Taylor, Jeff S. Liechty, Ashlee K. Minor, Eva D. Windhoffer, Aaron R. Pierce

Marine Ornithology

Many seabirds have sex-specific traits, including survival, philopatry, behavior, and diet, information that is essential for effective conservation strategies. The difficulty of sexing monomorphic seabirds, however, has resulted in a lack of information on these important traits and an incomplete understanding of the ecology of many species. We used a polymerase chain reaction (PCR)-based sexing approach to determine if Royal Thalasseus maximus and Sandwich terns T. sandvicensis in Louisiana, USA can be accurately sexed using morphometrics. DNA samples and morphological measurements were obtained from Royal Terns (n = 106) and Sandwich Terns (n = 112) to accurately identify sex and …

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The Rarest Alcid: Status And History Of The Guadalupe Murrelet Synthliboramphus Hypoleucus At Isla Guadalupe, Mexico (1892-2007), Darrell L. Whitworth, Harry R. Carter, Eduardo Palacios, Josh S. Koepke, William R. Mciver, Christine D. Hamilton, Gerard J. Mcchesney, Franklin Gress Jul 2025

The Rarest Alcid: Status And History Of The Guadalupe Murrelet Synthliboramphus Hypoleucus At Isla Guadalupe, Mexico (1892-2007), Darrell L. Whitworth, Harry R. Carter, Eduardo Palacios, Josh S. Koepke, William R. Mciver, Christine D. Hamilton, Gerard J. Mcchesney, Franklin Gress

Marine Ornithology

The Guadalupe Murrelet (GUMU) Synthliboramphus hypoleucus is the rarest alcid in the world (< 5000 pairs), with regular breeding documented only at Islas Guadalupe (hereafter, “Guadalupe”) and San Benito off the west-central coast of Baja California, Mexico. GUMU were discovered at Guadalupe in 1892, but by then feral cats Felis catus had already devastated the population and limited most nesting to predator-free islets just offshore. Despite its status as the only major GUMU breeding island, the population at Guadalupe was never adequately surveyed during the 20th century. In March–April 2007, we used survey techniques developed specifically for Synthliboramphus murrelets to assess the status and distribution of GUMU at Guadalupe. We counted 1511 GUMU during spotlight surveys in waters around the island. GUMU were abundant near the islets, but they were also relatively numerous near suitable breeding habitats off the north and south coasts of Guadalupe proper. Searches on four islets yielded 93 nests, most at Islotes Zapato (66; 71%) and Morro Prieto (21; 23%), where scores of abandoned eggs indicated intense competition for nests. We found seven nests on Guadalupe proper, the first proof of breeding there since 1950, but we also found 68 carcasses that confirmed significant predation by cats and raptors. A spotlight survey correction factor yielded 2418 breeding pairs (95% confidence interval = 1662–4367) at Guadalupe and its islets, which accounted for ~90% of the world breeding population (1822–4789 pairs). About 1150–1750 pairs were estimated on Islotes Zapato and Morro Prieto in 1968, but comparable data were lacking to assess historical or recent changes in population size. Basic studies of GUMU biology have only recently been initiated and should be a continuing priority. Recent conservation actions have benefited the native biota of Guadalupe, but further measures, such as localized rodent control and robust biosecurity on the islets, should be considered to mitigate serious threats to the vulnerable GUMU population and other seabirds.

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Levels Of Predation At Two Leach's Storm Petrel Hydrobates Leucorhous Breeding Colonies, Rielle Hoeg, Dave Shutler, Ingrid L. Pollet Jul 2025

Levels Of Predation At Two Leach's Storm Petrel Hydrobates Leucorhous Breeding Colonies, Rielle Hoeg, Dave Shutler, Ingrid L. Pollet

Marine Ornithology

Seabirds are declining worldwide, and predation by introduced and endemic species is one threat that affects many of them. Leach’s Storm Petrel Hydrobates leucorhous (hereafter LHSP) populations are declining in a number of locations for reasons that are likely multicausal, and perhaps local or regional, but relative contributions of individual causes are poorly understood. To help understand causes, we quantified predation at two Nova Scotian LHSP breeding colonies that differ in predator management: no management occurs on Bon Portage (BP) Island, whereas management is used on Country Island (CI). Transects were monitored for evidence of predation approximately biweekly on BP …

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Estimating Streaked Shearwater Calonectris Leucomelas Abundance In The Republic Of Korea Using Automated Acoustic Recorders, Kirk A. Hart, Steffen Oppel, Grant R.W. Humphries, Andrew Blackburn, Ki-Baek Nam Jul 2025

Estimating Streaked Shearwater Calonectris Leucomelas Abundance In The Republic Of Korea Using Automated Acoustic Recorders, Kirk A. Hart, Steffen Oppel, Grant R.W. Humphries, Andrew Blackburn, Ki-Baek Nam

Marine Ornithology

Traditional methods to assess population size in seabirds are applicable only to species that nest in visible locations, leaving cryptic nocturnal, burrow-nesting seabirds underrepresented in typical long-term population monitoring programs. Alternative methods to count burrow-nesting birds, however, are extremely labor-intensive and therefore are applicable only to small and possibly unrepresentative areas, and may have negative effects on burrow-nesting populations. We suggest the use of automatic acoustic recorders as a possible survey technique to overcome logistic difficulties of research of seabirds on remote islands in the Republic of Korea, where funding for ecological research is extremely limited but where globally important …

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Changes In The Population Size Of Yellow-Legged Gull Larus Michahellis At Essaouira And Mogador Island, West-Central Morocco, Siham Bellout, Moulay Abdeljalil Ait Baamrane, Ahmed Aamiri, Mohamed Aourir Jul 2025

Changes In The Population Size Of Yellow-Legged Gull Larus Michahellis At Essaouira And Mogador Island, West-Central Morocco, Siham Bellout, Moulay Abdeljalil Ait Baamrane, Ahmed Aamiri, Mohamed Aourir

Marine Ornithology

This study concerns changes in the size and population structure of a Yellow-legged Gull Larus michahellis colony, last assessed in 1985 in the city of Essaouira and on Mogador Island, Morocco. Using point-transect sampling, the average density measured in 2019 was 53.5 ± 2.8 birds/ha (5350 ± 280 birds/km2), which translates to a population size of almost 30 000 birds. The highest density occurred on Mogador Island, with 217.2 ± 28.3 birds/ha, a much higher density than previously recorded. The Yellow-legged Gull breeding population in the Essaouira–Mogador Island area has grown 3.58% per year since 1985, with an annual average …

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Low Prevalence Of Plasmodium And Haemoproteus In Resident Seabirds From Oceanic Islands Off The Brazilian Coast, Philippe N. Mariano, Gisele P. M. Dantas Jul 2025

Low Prevalence Of Plasmodium And Haemoproteus In Resident Seabirds From Oceanic Islands Off The Brazilian Coast, Philippe N. Mariano, Gisele P. M. Dantas

Marine Ornithology

Bird pathogens promote morbidity and mortality that affect bird population stability. In this context, the present study aimed to detect blood intracellular parasites by molecular methods in four species of seabirds, Masked Booby Sula dactylatra, Red-footed Booby S. sula, Brown Booby S. leucogaster, and Magnificent Frigatebird Fregata magnificens, on the Brazilian coast. Blood samples were collected in the Archipelagos of São Pedro and São Paulo, Fernando de Noronha, Atol das Rocas, and Trindade and Martim Vaz. Genomic DNA was extracted with proteinase K digestion and purification with phenol and chloroform. For each sample, three independent polymerase chain reactions were performed …

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The Feeding Ecology And Behavior Of Breeding Iceland Gulls Larus Glaucoides Kumlieni And Comparisons With Sympatric Large Larus Gulls On Southwestern Baffin Island, Canada, Scott S. Moorhouse Jul 2025

The Feeding Ecology And Behavior Of Breeding Iceland Gulls Larus Glaucoides Kumlieni And Comparisons With Sympatric Large Larus Gulls On Southwestern Baffin Island, Canada, Scott S. Moorhouse

Marine Ornithology

The feeding ecology and behavior of breeding Iceland Gulls Larus glaucoides kumlieni and, to a lesser extent, American Herring Gulls Larus smithsonianus and Glaucous Gulls Larus hyperboreus, were studied at a large Iceland Gull colony located near Kinngait, Baffin Island, Canada. Iceland Gulls collected food close to the colony, mainly at ebbing and low tides, on or very close to the shoreline, and in adjacent nearshore waters. The most common feeding technique was picking on the water surface while swimming. Additional techniques included plunging to capture food items at greater depths and kleptoparasitism. Known food items included marine invertebrates and …

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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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