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Contents, Pacific Seabird Group

Marine Ornithology

No abstract provided.

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Masthead, Pacific Seabird Group

Marine Ornithology

No abstract provided.

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Author Instructions, Pacific Seabird Group

Marine Ornithology

No abstract provided.

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Reviews: Dare To Bird: Exploring The Joy And Healing Power Of Birds (Hafting, M.); Migration Mysteries: Adventures, Disasters, And Epiphanies In A Life With Birds (Rappole, J.H.); Catastrophic Thinking: Extinction And The Value Of Diversity From Darwin To The Anthropocene (Sepkoski, D.); The Aquatic World Of Penguins. Biology Of Fish-Birds. (Ainley, D.G. & Wilson, R.P.), Eric Wagner, Eric J. Woehler

Marine Ornithology

No abstract provided.

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‘Floating Populations’ Of Seabirds: The Bane Of Demographic Modelers And Managers, David G. Ainley, George J. Divoky, Pat Baird, Gregory C. Spencer

Marine Ornithology

’Floating’ portions of seabird populations (mature but non-breeding individuals) are generally ignored in seabird research and management despite frequent evidence of their existence, especially in cavity-nesting species for whom nest habitat is often limiting. Here we demonstrate, using a few among an appreciable number of cases, that often more adults contribute to regional populations than colony-based censuses reveal, and that these birds are able to breed but do not. Once given the chance through the creation of nesting habitat, either by natural or human-caused processes, these populations reveal themselves by occupying the newly created habitats to become breeders. We include …

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Status Of Terns On Nakhiloo Island, Persian Gulf, With Emphasis On Lesser Crested Terns Thalasseus Bengalensis, Hamed Ghanaatian, Alireza Safahieh, Keivan Kabiri, Ahmad Savari

Marine Ornithology

Lesser Crested Tern Thalasseus bengalensis (LCT) is the second most abundant tern in the Persian Gulf region. Stratified random sampling was used to census the colonies on Nakhiloo Island, Iran. On average, 9.45 eggs, 2.2 early chicks, and 1.1 empty nests with material were counted in each 1×1 m plot in late June 2022. Analysis of those results indicated the breeding population of LCT on Nakhiloo Island to be 31 786 pairs. Other terns and plovers were also present in five of seven LCT subcolonies. Variable sea-surface temperatures (SST) with a slight upward trend and a decrease in chlorophyll a …

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Have Rodents Impacted The Breeding And Distribution Of Black Noddy Anous Minutus On Lord Howe Island?, Nicholas Carlile, Lisa O’Neill, Terence O’Dwyer

Marine Ornithology

Rodents are well known to impact nesting seabirds. However, not all seabird species are equally susceptible to rodents due to variations in size, nest-site selection, or nesting behaviour. The Black Noddy Anous minutus, a common tropical, tree-nesting species, began colonisation of North Bay on Australia’s Lord Howe Island in 1989, 70 years after the establishment of Black Rats Rattus rattus. In 2014, when the breeding colony consisted of 560 pairs, we commenced a pilot study to assess impacts of rodents. Ten motion-triggered cameras monitoring 12 nests showed no rodent presence on any branches within view; 11 of those nesting attempts …

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Non-Significant Effect Of El Niño On The Nest Occupancy And Breeding Success Of Markham’S Storm Petrel Hydrobates Markhami, Fernando Medrano, Benjamín Gallardo, Pablo Gutiérrez, Ronny Peredo, Giannira Álvarez, Nelson Contardo, Rodrigo Silva, Ivo Tejeda

Marine Ornithology

The impact of the El Niño varies across seabirds, usually altering the distribution and causing population declines. Understanding El Niño’s effects is thus critical for conservation. We monitored 296 nests of the little-known Hydrobates markhami during three seasons (2021–2023). We tested annual differences in individual breeding success and nest occupancy against the Southern Oscillation Index and found no effect. Our findings can be explained by the storm petrels’ diet, which is more closely related to primary production than is the prey of other seabirds. Alternatively, individuals may compensate for the effects of El Niño by changing foraging strategies.

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Seasonal And Spatial Variations In Densities Of Marbled Murrelets Brachyramphus Marmoratus Off Southwestern Vancouver Island, Alan E. Burger, E. Anne Stewart

Marine Ornithology

The ocean off Vancouver Island, British Columbia, is a productive area supporting diverse marine life, including a globally important breeding population of Marbled Murrelets Brachyramphus marmoratus. We report on the year-round at-sea distribution and densities of this murrelet off southwestern Vancouver Island based on monthly vessel surveys in 1993–2000. Surveys covered three ocean zones: Nearshore (sheltered waters, usually < 20 m deep, within 1–2 km of shore; 69 surveys), Inshore (exposed coastal waters, < 50 m deep, within 6 km of shore; 38 surveys), and Offshore (exposed open seas over the continental shelf, > 50 m deep, generally > 6 km from shore; 29 surveys). Year-round mean densities (± standard deviation, in birds/km2) for Nearshore, Inshore, and Offshore waters were 4.5 ± 5.8, 1.5 ± 1.2, and 0.2 ± 0.2, respectively. During peak breeding season (May–July), densities …

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No Evidence For High Pathogenicity Avian Influenza In Waved Albatross Phoebastria Irrorata, Gustavo Jiménez-Uzcátegui, Alberto Vélez, Patricio Vega, Verónica Buendia, Verónica Montenegro-Benalcázar, Christian Sevilla, Marilyn Cruz

Marine Ornithology

Highly pathogenic avian influenza (HPAI) is caused by the Alphainfluenzavirus influenzae species (type A, subtype H5N1), which has been detected in mammals (including humans) and marine birds in the Americas, including the Galápagos Islands. The Waved Albatross Phoebastria irrorata is a marine endemic species of Ecuador. Most of its breeding population nests on Española Island in the Galápagos Archipelago, and it forages at sea in the eastern South Pacific. This marine bird shares its feeding areas with the Peruvian Pelican Pelecanus thagus, Peruvian Booby Sula variegata, Guanay Cormorant Leucocarbo bougainvillii, Humboldt Penguin Spheniscus humboldti, Sanderling Calidris alba, Belcher’s Gull Larus …

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Mixed Metrics And The Need To Adjust Remote-Sensing Data In The Evaluation Of Key Biodiversity Areas For Colonial-Nesting Seabirds: An Example With Glaucous-Winged Gulls Larus Glaucescens, Michael S. Rodway, Douglas F. Bertram, Lindsay A.R. Lalach

Marine Ornithology

Conservation initiatives such as the Key Biodiversity Areas (KBA) Programme use standardized criteria based on estimates of species abundance to identify critical habitats. They therefore depend on accurate estimates of population sizes for target species. It is essential that the metrics used to measure abundance at a candidate site are consistent with those used to estimate total abundance at national or global scales, because only then can it be determined whether abundance at a site meets threshold criteria. Imagery gathered by remotely piloted aircraft systems (RPAS, or drones) has rapidly become a tool for determining abundance of surface-nesting seabirds and, …

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Assessing The Short- And Long-Term Response Of Gulls To Non-Lethal Hazing On An Offshore Island, Pete Warzybok, Nadav Nur, Russell W. Bradley, Dan Grout, Gerard J. Mcchesney

Marine Ornithology

Non-lethal bird hazing techniques are commonly used to protect public health and safety, defend crops, and safeguard the birds themselves. Examples of their use include warding them away from airports, landfills, oil spills, and other avian toxic exposure situations. Herein we examine the efficacy of non-lethal hazing tools for minimizing impacts to Gulls Larus spp. prior to a proposed eradication of introduced House Mice Mus musculus at the South Farallon Islands, 30 km offshore of the Central California coast. Methods considered for removing mice include the aerial application of rodenticide, which poses an adverse risk to non-target wildlife, including Western …

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Dynamics Of Humboldt Penguin Colonization On Port Terminal Infrastructure In Southern Peru, Carlos Zavalaga, Sebastián Lozano-Sanllehi, Ximena Velez-Zuazo, Bruno Vildoso

Marine Ornithology

The use of artificial structures by seabirds is a globally recognized phenomenon driven by escalating human coastal development. Designed as maritime infrastructure, breakwaters, jetties, and bridges inadvertently offer nesting habitat and refuge for a diverse assemblage of seabird species. The construction of a detached breakwater at the port terminal of the PERU LNG natural gas liquefaction plant in Melchorita, Peru, provided a unique opportunity to observe seabird colonization of new habitat, in this case colonization by Humboldt Penguins Spheniscus humboldti from 2008 to 2024. The penguins founded a permanent breeding site within 3.5 years after cessation of human activity at …

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Variation In The Heartbeat Of The White Tern Gygis Alba During Incubation, Antony W. Diamond, Adelheid Studer-Thiersch

Marine Ornithology

Rapid global heating is a particular danger to tropical birds already near their thermal maximum. White Terns Gygis alba are important to tourism in the Seychelles Islands, where, in 1974, we took an unexpected opportunity to measure the heart rate of two incubating adults. We found that the birds had higher heart rates at night compared to during the day, and their heart rates increased rapidly when approached by people. Local temperatures have risen considerably since these data were collected nearly 50 years ago and are predicted to rise even further by 2100. Given the importance of White Terns as …

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Ecological Correlates Of Reproduction Of A Bet-Hedging Seabird, The Kittlitz’S Murrelet Brachyramphus Brevirostris, Michelle L. Kissling, Paul M. Lukacs, Grey W. Pendleton, Jonathan J. Felis, Scott M. Gende, Stephen B. Lewis

Marine Ornithology

For longer-lived species, individuals hedge their bets by skipping breeding when conditions are poor to preserve the opportunity for future breeding attempts. Thus, understanding the ecological drivers behind the ‘choice’ to reproduce or not is a key step in identifying and diagnosing causes of population change. We investigated both marine and terrestrial factors that might influence whether Kittlitz’s Murrelets Brachyramphus brevirostris—a long-lived seabird of conservation concern that is often associated with glacially-influenced habitats—choose to breed in a given year. We used a suite of proxies to explain variation in reproductive metrics of radio-tagged Kittlitz’s Murrelets, exploring three hypotheses related to …

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Updated Distribution And Population Dynamics Of Magellanic Penguin Spheniscus Magellanicus Colonies In The Strait Of Magellan, Chile, Manuel Ochoa-Sánchez, Jorge Acevedo, Claudio Moraga, Katherine Gaete, Pedro Valenzuela, Valeria Souza, Eliana Paola Acuña Gomez

Marine Ornithology

The Magellanic Penguin Spheniscus magellanicus exhibits a broad latitudinal distribution in southern South America. However, the locations of many breeding colonies remain poorly known on the Pacific side, particularly in the southernmost region. Here, we provide information for six Magellanic Penguin colonies in the Strait of Magellan and adjacent waters that have been known by the local community for years but were unknown in the scientific literature until now: Rupert Islet, Tuckers Islet 1, Tuckers Islet 2, James Island 1, James Island 2, and Monmouth Island. These locations differ in population size and in vegetation coverage: most colonies are characterized …

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Characterizing Diet Of The Least Tern Sternula Antillarum Using Dna Metabarcoding, Viktoria E. Bogantes, Abigail J. Darrah, Molly Folkerts Caldwell, Amy K. Fellgren, Justine M. Whitaker, Alexis M. Janosik

Marine Ornithology

A complete picture of diet composition is an essential element to understanding the ecological role of organisms. Moreover, diet studies can serve as an important tool for monitoring species and changes to the food web. One method to provide resolution when studying the diet of avian species is DNA metabarcoding of fecal samples. As such, we used DNA analysis to determine the diet of the Least Tern Sternula antillarum and compare results with diet analysis based on composition of fish dropped within breeding colonies. Comparisons between adult and chick fecal samples were also made across three years and within three …

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The Breeding Of Leach’S Storm Petrel Hydrobates Leucorhous In The Southern Hemisphere, Les G. Underhill

Marine Ornithology

It is likely that Leach’s Storm Petrels Hydrobates leucorhous have bred at widely scattered locations in the Southern Hemisphere. The potential for this Vulnerable species to improve its conservation status by encouraging the colonization of Southern Hemisphere localities needs to be investigated.

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Mesopelagic Diet As Pathway Of High Mercury Levels In Body Feathers Of The Endangered Black-Capped Petrel (Diablotin) Pterodroma Hasitata, Yvan G. Satgé, Sarah E. Janssen, Gemma Clucas, Ernst Rupp, J. Brian Patteson, Patrick G.R. Jodice

Marine Ornithology

The Diablotin or Black-capped Petrel Pterodroma hasitata is an endangered gadfly petrel found in the western North Atlantic, Caribbean Sea, and northern Gulf of Mexico. An estimated ~2000 pairs nest at five known sites on Hispaniola, Greater Antilles, although only 120 nests have been located to date. We collected breast feathers and feces from breeding adults in the Dominican Republic in April 2018 (n = 10) and from non-breeding adults at sea offshore of North Carolina, USA, in May 2019 (n = 10). We measured mercury burden in feathers and used fecal DNA metabarcoding to compare diets. We found higher …

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Black Oystercatcher Haematopus Bachmani Productivity In California And Oregon And The Effects Of Nest Site And Environmental Covariates, Anna Weinstein, Joseph Liebezeit, Daniel Orr, Ryan D. Carle, Timothy D. Meehan

Marine Ornithology

Black Oystercatcher Haematopus bachmani is a species of conservation concern due to its small global population, reliance on somewhat restricted intertidal habitat, and vulnerability to climate change impacts. Concern for this species, along with a lack of demographic information from the southern portion of its range, gave rise to a community science project to monitor pair productivity, nest characteristics, and nest disturbance from 2012 through 2022 across three study regions in Oregon and California. A clear spatial gradient existed in productivity, with relatively low values in the southern region (0.37 fledged young per pair per year, 95% confidence interval [CI] …

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Assessment Of Tufted Puffin Fratercula Cirrhata Diet Using Dna Metabarcoding, Thomas P. Good, Andrew O. Shelton, Abigail H. Wells, Ana Ramón-Laca, Ramon Gallego, Peter J. Hodum, Scott F. Pearson

Marine Ornithology

Investigating trophic relationships can be critical for understanding relationships between marine predators and their prey. DNA analysis of feces is used increasingly as a non-invasive method to uncover seabird dietary patterns across space and time. Tufted Puffins Fratercula cirrhata are listed as Endangered in the state of Washington (WA), USA, and reduced prey availability is thought to be a key factor in the species’ decline. Recent information on Tufted Puffin diet is lacking, and present opportunities for direct diet observation are limited. We conducted a pilot study to characterize Tufted Puffin diet on Destruction Island, WA, in 2019 using DNA …

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Oviposition Lag In Nazca Boobies Sula Granti, Leslie D. Clifford, David J. Anderson

Marine Ornithology

Egg formation in well-studied poultry includes rapid yolk deposition (RYD), which completes the formation of the ovum, then ovulation and uptake of the ovum by the oviduct to complete egg formation. Roughly a day passes between the end of RYD and oviposition in these species. In other species, notably seabirds, egg formation is paused at the end of RYD for days or even more than a week. The phylogenetic coverage of data on this “oviposition lag” is patchy. We present the first estimate of oviposition lag for the Sulidae (4 d) and only the second estimate for the Suliformes.

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The Distribution, Abundance, And Habitat Use Of Wintering Iceland Gulls Larus Glaucoides Thayeri In Northern California And Comparisons With Other Larus Gulls., Scott S. Moorhouse

Marine Ornithology

Recent studies have provided significant insights, but relatively limited information is available on many aspects of the ecology and behavior of the Arctic-breeding Iceland Gull Larus glaucoides. In this study, the distribution, abundance, and habitat use of wintering Iceland Gulls Larus glaucoides thayeri in Northern California, USA, were analyzed in 30 habitat types over three winters. A total of 6012 individuals was recorded, contributing 2.3% of the total Larus gulls recorded. The mean number of Iceland Gulls recorded per count was highest in sanitary landfills located in the Inner Coast Range, Central Valley, Inner Coast, and San Francisco Bay Plain …

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Life-History Traits And Divergence In Population Trends Of Two North Pacific Auks: Rhinoceros Auklet Cerorhinca Monocerata And Tufted Puffin Fratercula Cirrhata, J. Mark Hipfner

Marine Ornithology

Population trends in two closely related and ecologically similar North Pacific auks, the Rhinoceros Auklet Cerorhinca monocerata and Tufted Puffin Fratercula cirrhata, have diverged over recent decades: stable in the former, declining in the latter. I propose that differences between the two species in a broad suite of interrelated morphological, demographic, behavioral, and physiological life-history traits could explain their differing responses to recent environmental conditions.

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A Regionally Significant Population Of White-Tailed Tropicbirds Phaethon Lepturus On Kurehdhoo (Lhaviyani Atoll), Republic Of The Maldives, James C. Russell, Sebastian Steibl, Guy M.W. Stevens

Marine Ornithology

Coral atoll islands are important breeding sites for tropical seabird species, but on many of these islands, disturbances from humans and introduced mammals have extirpated breeding colonies. In the Republic of the Maldives (Indian Ocean), little published information exists on the location and extent of seabird breeding colonies. Here, we document what appears to be a regionally significant breeding site for White-tailed Tropicbirds Phaethon lepturus on Kurehdhoo, the northern-most inhabited island of Lhaviyani Atoll in the central Maldives. We systematically surveyed the entire island on two separate occasions, six months apart, to count the number of White-tailed Tropicbird nests, their …

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Notes On The Birds Of Schirmacher Oasis, Dronning Maud Land, East Antarctica., Peter G. Ryan

Marine Ornithology

The Schirmacher Oasis in central Dronning Maud Land, East Antarctica, has a long history of ornithological observations and is one of the few areas in East Antarctica experiencing a warming climate. Snow Petrels Pagodroma nivea and Wilson’s Storm Petrels Oceanites oceanicus were reported to breed at Schirmacher Oasis in the past, but currently the only confirmed regular breeding species is the South Polar Skua Stercorarius maccormicki. This note summarises observations at the Oasis in November and December 2023. Wilson’s Storm Petrels were the most abundant bird, breeding at several sites along the northern scarp in December. Pairs of Adelie Penguins …

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Masthead, Pacific Seabird Group

Marine Ornithology

No abstract provided.

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Contents, Pacific Seabird Group

Marine Ornithology

No abstract provided.

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Inside Front Cover, Pacific Seabird Group

Marine Ornithology

No abstract provided.

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Evicted From The Outside, Colleen Cosgriff

Maine Law Review

In recent years, Maine has seen an increase in the number of people experiencing homelessness who are living outdoors. People living in these circumstances often shelter together in groups of tents or other temporary structures commonly referred to as “encampments.”As municipalities across Maine struggled with how best to respond to the increase in encampments across the state, the United States Supreme Court decided City of Grants Pass v. Johnson, a case originating in Grants Pass, Oregon. Grants Pass wanted to issue civil and criminal fines to people for sleeping outdoors, even when no alternative shelter was available. The city ultimately …

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Full-Text Articles in Entire DC Network

Contents, Pacific Seabird Group

Marine Ornithology

Masthead, Pacific Seabird Group

Marine Ornithology

Author Instructions, Pacific Seabird Group

Marine Ornithology

Marine Ornithology

‘Floating Populations’ Of Seabirds: The Bane Of Demographic Modelers And Managers, David G. Ainley, George J. Divoky, Pat Baird, Gregory C. Spencer

Marine Ornithology

Status Of Terns On Nakhiloo Island, Persian Gulf, With Emphasis On Lesser Crested Terns Thalasseus Bengalensis, Hamed Ghanaatian, Alireza Safahieh, Keivan Kabiri, Ahmad Savari

Marine Ornithology

Have Rodents Impacted The Breeding And Distribution Of Black Noddy Anous Minutus On Lord Howe Island?, Nicholas Carlile, Lisa O’Neill, Terence O’Dwyer

Marine Ornithology

Non-Significant Effect Of El Niño On The Nest Occupancy And Breeding Success Of Markham’S Storm Petrel Hydrobates Markhami, Fernando Medrano, Benjamín Gallardo, Pablo Gutiérrez, Ronny Peredo, Giannira Álvarez, Nelson Contardo, Rodrigo Silva, Ivo Tejeda

Marine Ornithology

Seasonal And Spatial Variations In Densities Of Marbled Murrelets Brachyramphus Marmoratus Off Southwestern Vancouver Island, Alan E. Burger, E. Anne Stewart

Marine Ornithology

No Evidence For High Pathogenicity Avian Influenza In Waved Albatross Phoebastria Irrorata, Gustavo Jiménez-Uzcátegui, Alberto Vélez, Patricio Vega, Verónica Buendia, Verónica Montenegro-Benalcázar, Christian Sevilla, Marilyn Cruz

Marine Ornithology

Mixed Metrics And The Need To Adjust Remote-Sensing Data In The Evaluation Of Key Biodiversity Areas For Colonial-Nesting Seabirds: An Example With Glaucous-Winged Gulls Larus Glaucescens, Michael S. Rodway, Douglas F. Bertram, Lindsay A.R. Lalach

Marine Ornithology

Assessing The Short- And Long-Term Response Of Gulls To Non-Lethal Hazing On An Offshore Island, Pete Warzybok, Nadav Nur, Russell W. Bradley, Dan Grout, Gerard J. Mcchesney

Marine Ornithology

Dynamics Of Humboldt Penguin Colonization On Port Terminal Infrastructure In Southern Peru, Carlos Zavalaga, Sebastián Lozano-Sanllehi, Ximena Velez-Zuazo, Bruno Vildoso

Marine Ornithology

Variation In The Heartbeat Of The White Tern Gygis Alba During Incubation, Antony W. Diamond, Adelheid Studer-Thiersch

Marine Ornithology

Ecological Correlates Of Reproduction Of A Bet-Hedging Seabird, The Kittlitz’S Murrelet Brachyramphus Brevirostris, Michelle L. Kissling, Paul M. Lukacs, Grey W. Pendleton, Jonathan J. Felis, Scott M. Gende, Stephen B. Lewis

Marine Ornithology

Updated Distribution And Population Dynamics Of Magellanic Penguin Spheniscus Magellanicus Colonies In The Strait Of Magellan, Chile, Manuel Ochoa-Sánchez, Jorge Acevedo, Claudio Moraga, Katherine Gaete, Pedro Valenzuela, Valeria Souza, Eliana Paola Acuña Gomez

Marine Ornithology

Characterizing Diet Of The Least Tern Sternula Antillarum Using Dna Metabarcoding, Viktoria E. Bogantes, Abigail J. Darrah, Molly Folkerts Caldwell, Amy K. Fellgren, Justine M. Whitaker, Alexis M. Janosik

Marine Ornithology

The Breeding Of Leach’S Storm Petrel Hydrobates Leucorhous In The Southern Hemisphere, Les G. Underhill

Marine Ornithology

Mesopelagic Diet As Pathway Of High Mercury Levels In Body Feathers Of The Endangered Black-Capped Petrel (Diablotin) Pterodroma Hasitata, Yvan G. Satgé, Sarah E. Janssen, Gemma Clucas, Ernst Rupp, J. Brian Patteson, Patrick G.R. Jodice

Marine Ornithology

Black Oystercatcher Haematopus Bachmani Productivity In California And Oregon And The Effects Of Nest Site And Environmental Covariates, Anna Weinstein, Joseph Liebezeit, Daniel Orr, Ryan D. Carle, Timothy D. Meehan

Marine Ornithology

Assessment Of Tufted Puffin Fratercula Cirrhata Diet Using Dna Metabarcoding, Thomas P. Good, Andrew O. Shelton, Abigail H. Wells, Ana Ramón-Laca, Ramon Gallego, Peter J. Hodum, Scott F. Pearson

Marine Ornithology

Oviposition Lag In Nazca Boobies Sula Granti, Leslie D. Clifford, David J. Anderson

Marine Ornithology

The Distribution, Abundance, And Habitat Use Of Wintering Iceland Gulls Larus Glaucoides Thayeri In Northern California And Comparisons With Other Larus Gulls., Scott S. Moorhouse

Marine Ornithology

Life-History Traits And Divergence In Population Trends Of Two North Pacific Auks: Rhinoceros Auklet Cerorhinca Monocerata And Tufted Puffin Fratercula Cirrhata, J. Mark Hipfner

Marine Ornithology

A Regionally Significant Population Of White-Tailed Tropicbirds Phaethon Lepturus On Kurehdhoo (Lhaviyani Atoll), Republic Of The Maldives, James C. Russell, Sebastian Steibl, Guy M.W. Stevens

Marine Ornithology

Notes On The Birds Of Schirmacher Oasis, Dronning Maud Land, East Antarctica., Peter G. Ryan

Marine Ornithology

Masthead, Pacific Seabird Group

Marine Ornithology

Contents, Pacific Seabird Group

Marine Ornithology

Inside Front Cover, Pacific Seabird Group

Marine Ornithology

Evicted From The Outside, Colleen Cosgriff

Maine Law Review